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39results about How to "Reaction control is easy" patented technology
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Preparation method of 1,3,6-hexanetricarbonitrile
ActiveCN105037203AImprove performanceAvoid security issuesSecondary cellsPreparation by cyanide reactionRaw materialSodium
The invention relates to a preparation method of 1,3,6-hexanetricarbonitrile, which comprises the following steps: A. preparation of 1,3-dicyano-2-butylene; and B. preparation of the 1,3,6-hexanetricarbonitrile. The invention provides a new preparation method of 1,3,6-hexanetricarbonitrile, which is completely different from the traditional technique and solves the safety problem in the 1,3,6-hexanetricarbonitrile preparation process in the presence of sodium. Thus, the technique is safer, and satisfies the demands for large-scale industrial production. Besides, the preparation method has the advantages of high yield, accessible raw materials, simple reaction control, high product purity and the like.
Owner:SHIJIAZHUANG SAN TAI CHEM CO LTD
Gypsum drying and calcining machine
InactiveCN103553386AThe reaction control process is simpleImprove responseGypsumMechanical engineering
The invention discloses a gypsum drying and calcining machine which is characterized by comprising a drying part mechanism and a calcining part mechanism, wherein the drying part mechanism comprises a drying shell capable of being arranged rotatably, a plurality of lifting plates which can rotate along with the shell to drive materials to move forwards are obliquely arranged on the inner wall of the drying shell, a feeding mechanism is arranged at a feed end of the drying shell, and a heating air feed pipe for drying is arranged consequently in the drying shell; the calcining part mechanism comprises a calcining shell capable of being arranged rotatably, and a heating air feed pipe for calcining is arranged at a discharge end of the calcining shell; a vertically-arranged exhaust funnel is arranged between the discharge end of the drying shell and the feed end of the calcining shell, and an intermediate powder discharge shuttle tank and a rotatable transition shuttle tank are arranged in the exhaust funnel. The gypsum drying and calcining machine disclosed by the invention has the advantages of simple structure, capability of ensuring precise control of the reaction process and improving the reaction treatment effect, and capability of obtaining intermediate treatment product powder and higher product powder purity.
Owner:罗蕙先
Two-step synthetic method of polyurethane modulus gradient material
The invention provides a two-step synthetic method of a polyurethane modulus gradient material. The method is as below: first, using low molecular weight polyether glycol and aromatic diisocyanate as raw materials to synthesize an isocyanate terminated polyurethane prepolymer; and second, mixing the product with aromatic diisocyanate in different molar ratios, and then conducting ring trimerization reaction in the solvent under body condition, so as to finally obtain the polyurethane modulus gradient material. The synthetic method has the advantages that the first step has reaction stability and stable and controllable product quality, and the second step reaction system has low viscosity and even mixing, and is conducive to forming process of the material, and materials with different elastic modulus can be obtained by adjusting the molar ratio of the reactants. Different from the traditional polyurethane, the polyurethane modulus gradient material does not have obvious glass transition region, and shows gradual decrease of the elastic modulus with the increase of temperature.
Owner:BEIJING UNIV OF CHEM TECH
Method for synthesizing progesterone midbody 3beta-hydroxy-5-pregnene-20-ketone
ActiveCN102964415AAvoid it happening againReduce oxidation recovery processSteroidsPregneneProgesterones
The invention relates to a method for synthesizing progesterone midbody 3beta-hydroxy-5-pregnene-20-ketone. By the method, a refining procedure and a by-product oxidation recovery processing procedure of a traditional synthesizing process are saved. The obtained midbody does not need to be refined, the once quality yield is more than 86%, and the product purity is more than 99.0%.
Owner:HUAZHONG PHARMA
Method for preparing amide by metallic sodium catalyzed ester ammonolysis reaction
InactiveCN106928083ALow costEasy to separateOrganic compound preparationCarboxylic acid amides preparationHigh pressureReaction speed
The invention discloses a method for preparing amides by metallic sodium-catalyzed ester amination reaction: the reaction is carried out in an autoclave at 90-140°C with ester and liquid ammonia as raw materials and metallic sodium as a catalyst, ester:ammonia=1:1.2 The molar ratio of ~5.0, metal sodium is 4~10% of the molar weight of the ester; when the reaction pressure no longer drops, the reaction is stopped, the unreacted ammonia is recovered, and the obtained reaction product is post-processed to obtain the product. The method can efficiently prepare amides; and the raw materials are cheap, low in toxicity, high in reactivity, less in catalyst consumption, fast in reaction speed, high in reaction conversion rate, and easy to separate products.
Owner:ZHEJIANG UNIV
Siloxane copolymer containing ethyl phenyl silica chain links and preparation method thereof
The invention relates to the field of organic polymer chemistry, and specifically relates to a siloxane copolymer containing ethyl phenyl silica chain links and a preparation method thereof. The preparation method comprises the following steps: taking ethyl phenyl dialkoxysilane and dimethyl dialkoxysilane as the raw materials, carrying out hydrolysis condensation reactions in the presence of an anionic type or cationic type hydrolysis catalyst to generate oligomer composed of ethyl phenyl silica chain links and dimethyl silica chain links, then mixing the obtained oligomer with end-capping reagents with different structural types, carrying out reactions in the presence of an anionic type or cationic type polymerization catalyst, and subjecting the reaction products to neutralization / catalyst decomposition and reduced pressured distillation to remove low-boiling-point substances so as to obtain poly(dimethyl-ethylphenyl)siloxane copolymer with ends capped by different functional groups. The species of the monomer used in the provided method are few, the polymerization reaction conditions are mild, the reaction process control is simple, the copolymer structure is uniform, and the performance of the copolymer is excellent, and the provided method is suitable for massive industrial production.
Owner:山东宝龙达新材料有限公司
Synthesizing method of hydroxyl-terminated liquid fluorine rubber modified polyurethane material with gradient modulus
The invention provides a synthesizing method of a hydroxyl-terminated liquid fluorine rubber modified polyurethane material with gradient modulus. The method comprises the steps that 1, polyether diol with a low molecular weight, hydroxyl-terminated liquid fluorine rubber and aromatic diisocyanate serve as the raw materials to synthesize an isocyanate-terminated modified polyurethane prepolymer; 2, the product in the first step is mixed with different mole ratios of aromatic diisocyanate, a cyclotrimerization reaction is conducted in a solvent in the ontological status, and the hydroxyl-terminated liquid fluorine rubber modified polyurethane material with the gradient modulus is obtained finally. The synthesizing method has the advantages that the reaction system is low in viscosity, and synthesis of the isocyanate-terminated polyurethane prepolymer is promoted; the method is novel, the reaction is easy to control, and the product is good and stable in quality. The obtained polyurethane material with the gradient modulus is good in toughness, temperature resistance and chemical medium resistance, and the elasticity modulus has gradualness along with changes of temperature.
Owner:BEIJING UNIV OF CHEM TECH
Process for production of 13C
InactiveCN102119121AThe reaction device is simpleReaction control is easyCarbon preparation/purificationMetal/metal-oxides/metal-hydroxide catalystsChemistryCompounds of carbon
Provided is a process for producing 13C, which is a non -radioactive stable isotope, by using a general-purpose hydrocarbon compound as the raw material without producing radioactive wastes. A process for the production of 13C, which is a non-radioactive stable isotope of carbon, by subjecting a raw material hydrocarbon compound to reaction in the presence of hydrogen, a sulfur compound, and a reaction catalyst at a temperature of 500 to 1000 DEG C, characterized in that the reaction catalyst is a sintered nickel compact or a sintered nickel alloy compact.
Owner:泽田重美
Gypsum drying and calcining machine
Owner:罗蕙先
The preparation method of 1,3,6-hexanetrinitrile
ActiveCN105037203BImprove performanceAvoid security issuesSecondary cellsPreparation by cyanide reactionHexaneRaw material
Provided is a method for preparing 1,3,6-hexanetricarbonitrile, comprising the following steps: A. preparation of 1,6-dicyano-2-butylene; and B. preparation of the 1,3,6-hexanetricarbonitrile. Provided is a new method for preparing 1,3,6-hexanetricarbonitrile. In addition to being a preparation method which is completely different from a traditional process, the preparation method also overcomes the safety problem present in the preparation of the 1,3,6-hexanetricarbonitrile in the presence of sodium, thus enabling the process to be safer, and at the same time, also achieving the requirements of large-scale industrial production. In addition, the preparation method of the present invention also has the advantages such as a high yield, easily available raw materials, a simple reaction control, and a high product purity.
Owner:SHIJIAZHUANG SAN TAI CHEM CO LTD
Method for producing hydrogen or deuterium, method for producing hydrogenated or deuterated organic compound, method for hydrogenating or deuterating organic compound, method for dehalogenating organic compound having halogen, and ball for use in mechanochemical reaction
InactiveCN104114480AGet efficientlyEfficient mechanochemical reactionHydrocarbon by hydrogenationCarboxylic acid esters preparationHalogenHydrogen
Owner:SHIONO CHEM
Novel method for preparing 1-oxacephalosporin derivative
InactiveCN104487445AHigh yieldBeneficial technical effectAntibacterial agentsOrganic active ingredients1-OxacephalosporinMedicinal chemistry
The present invention relates to a novel method for preparing a 1-oxacephalosporin derivative, which is an intermediate for the synthesis of 1-oxacephalosporin which is useful as an antibacterial agent. The preparation method of the present invention uses a simple halogenating agent to show remarkable stability, have a simple reaction process, allow a reaction to be readily controlled, and reduce reaction time, and thus is very efficient and improves the production yield of 1-oxacephalosporin which is useful as an antibacterial agent.
Owner:JEIL PHARM CO LTD
Preparation method of 5-chloro-8-hydroxyquinoline
The invention discloses a preparation method of 5-chloro-8-hydroxyquinoline, aiming at solving the problems that when the 5-chloro-8-hydroxyquinoline is prepared by using 4-chloro-2-aminophenol, 4-chloro-2-nitrophenol and glycerol as raw materials and adopting a Skraup method in a loop closing way at present, sulfuric acid reacts violently with the glycerol in a process of dropwise adding the sulfuric acid so as to produce a large amount of acrolein, the acrolein self-polymerizes into tar, the tar is not only difficult to remove during the post-treatment of the product, but also reduces the reaction yield, the reaction process is difficult to control, and a great deal of waste acid is produced. According to the preparation method, hydrochloric acid is used as a solvent and the acrolein istaken as a loop closing raw material, so that the step of producing the acrolein by using the sulfuric acid and the glycerol is avoided, the generation of the tar is effectively reduced, and the heatrelease state of the reaction is controlled; furthermore, the problem that impurities are produced due to a sulfonation reaction of the product can be avoided, the product yield and safety are improved, the reaction is easy to control, and industrialization is easily realized; therefore, the preparation method has a higher application value.
Owner:LIER CHEM CO LTD
Method for preparing ternary precursor of lithium battery by cyclic electrolysis
ActiveCN110311114AReaction control is easyReduce manufacturing costElectrolysis componentsSecondary cellsWater contentSolid phases
The invention discloses a method for preparing a ternary precursor of a lithium battery by cyclic electrolysis. The method comprises the steps that (1) an active metal salt solution is mixed with an anion polymerization agent to acquire an electrolyte; (2) the electrolyte is electrolyzed through three-chamber membrane electrolysis reaction; and (3) an acid-soluble nickel-cobalt-manganese mixture is mixed with an acid solution acquired by electrolysis in the step (2) to acquire a mixed liquid; and the mixed liquid is added to an alkali chamber during electrolysis, and stirring and mixing are carried out at a rate of 50 to 300 r / min; and (4) the product acquired in the alkali chamber in the step (3) is filtered, and the solid phase product is washed, and then dried under vacuum at 60 to 120DEG C until the water content in the solid phase product is 0.1 to 0.5%, so as to acquire the lithium battery ternary precursor. According to the invention, in the reaction process adding an additional addition agent, an antioxidant, a dispersant and the like is not needed, so that the reaction control is greatly simplified, and the production cost is reduced; and the prepared ternary precursor have better performance indexes than a conventional coprecipitation method.
Owner:重庆绿色电池研究院有限公司
Method for preparing aromatic azoxycompound based on aromatic amine oxidation
InactiveCN114262284AHigh reaction yieldSimple reaction systemOrganic chemistryOrganic-compounds/hydrides/coordination-complexes catalystsAzoxyMetal-organic framework
The invention discloses a method for preparing an aromatic azoic oxide compound based on aromatic amine oxidation, which is characterized in that water is used as a green solvent, hydrogen peroxide is used as an oxidant, a zirconium-based metal organic framework is used as a catalyst, and aromatic amine is selectively catalytically oxidized into the corresponding aromatic azoic oxide compound. The method is simple in reaction, easy and convenient to operate, good in selectivity and high in yield, is a green synthesis method of the azobenzene oxide compound, provides a new synthesis route for preparation of the compound, and has good scientific research value and industrialization potential.
Owner:WENZHOU UNIVERSITY
Process for producing octabromodiphenyl ethane
ActiveCN101429096ARaw materials are easy to getLess investmentHalogenated hydrocarbon preparationBromineDistillation
The invention discloses a method for preparing octabromo-diphenylethane. The method comprises the following steps: catalyst is added into liquid bromine and stirred for reaction, and a mixture A of the liquid bromine and the catalyst is obtained; diarylethane is dripped into the mixture A under the condition of stirring, and continuously stirred for reaction after the dripping process is over, and a mixture B is obtained; water and a metallic ion remover are added into the mixture B under the condition of stirring, and a mixture C is obtained; the mixture C is distilled for removal of superfluous liquid bromine and superfluous catalyst, and a product obtained after distillation is filtered to obtain a coarse octabromo-diphenylethane product; the octabromo-diphenylethane is added with water and a debrominating agent, crushed by the wet method, and subjected to solid-liquid separation after crushing to obtain a filter cake; and the filter cake is dried, and subjected to gas flow crushing to obtain white or primrose octabromo-diphenylethane solid powder. The method has easily obtained raw materials and small investment, and is simple in reaction control and easy in industrial production control. The bromine content of the product is high and can reach between 78 and 78.6.
Owner:SHANDONG TIANYI CHEM
Preparation method of organic silicon resin with core-shell structure
The invention relates to the technical field of organic silicon resin, and discloses a core-shell structure organic silicon resin preparation method, and the method comprises: S1, sequentially treating the surface of silicon dioxide through a vinyl-containing silane coupling agent and polymethyl methacrylate to obtain modified silicon dioxide; S2, adding the modified silicon dioxide in the S1 and an anhydrous solvent into a reactor, then adding a polysiloxane prepolymer, a platinum catalyst and hydrogen-containing polysiloxane for reaction, and after the reaction is finished, obtaining the organic silicon resin with the core-shell structure. By adopting the preparation method disclosed by the invention, polycondensation in subsequent use procedures can be effectively avoided, and meanwhile, the organic silicon resin prepared by adopting a segmented polymerization method has good compatibility with a resin matrix and is convenient to disperse.
Owner:CHENGDU SILIKE TECH
Preparation method of 5-chloro-8-hydroxyquinoline and purification method thereof
ActiveCN108610288AReaction control is easyEasy to industrializeOrganic chemistryPurification methodsWater insoluble
The invention discloses a preparation method of 5-chloro-8-hydroxyquinoline and a purification method thereof, which aims at solving the problem when 4-chloro-2-aminophenol, 4-chloro-2-nitrophenol andglycerol ring are used to obtain 5-chloro-8-hydroxyquinoline, the reaction process is difficult to control, so that a large amount of tar can be generated, the reaction yield is low, the reaction operation is difficult, and a large amount of waste acid is generated after the post treatment. Boric acid and insoluble organic solvents being added into the reaction solution is the innovation of the preparation method, by the method, the acuteness of direct production of acrolein from sulphuric acid and glycerol is mitigated by boric acid, the speed of the acrolein polymerization to generate the tar is reduced, the yield and the safety are effectively improved, and a small amount of an water-insoluble organic solvents can effectively prevent 4-chloro-2-nitrophenol from coagulating on the reactor wall, the problem that it is difficult to control in the process of production operation is solved, which shortens the reaction cycle and improves production efficiency. The preparation method of 5-chloro-8-hydroxyquinoline and purification method thereof has the advantages of less tar, high yield and safe reaction, and can effectively reduce waste acid production and is easy to industrialize.
Owner:LIER CHEM CO LTD +1
System and method for continuously preparing phenylhydroximic acid by using microreactor
PendingCN114797705ARealize continuous preparationReduce volumeOrganic chemistryChemical/physical/physico-chemical microreactorsMicroreactorHydroxylamine sulfate
The invention belongs to the technical field of chemical engineering, and particularly relates to a micro-reaction system and method for continuously preparing phenylhydroxamic acid by using a micro-reactor, and the method is specifically as follows: raw materials methyl phenylformate and hydroxylamine hydrochloride or hydroxylamine sulfate are mixed in the micro-reactor in the presence of sodium alkoxide to react to generate sodium phenylhydroxamic acid salt; the device comprises a plurality of micro-reactors, the plurality of micro-reactors are connected in series through pipelines, and the last micro-reactor is connected with the reaction kettle through a pipeline. According to the method, the continuous preparation of the phenyl hydroximic acid is realized by adopting the microreactor, the process flow is simplified, the reaction period is short, the reaction is easy to control, the safety of the preparation process is improved, the selectivity is high, the yield of the phenyl hydroximic acid reaches 95% or above, and the method can be used for commercially producing a flotation agent phenyl hydroximic acid product.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Dimethyl cysteamine hydrochloride synthetic process
InactiveCN106565563AReduce usageMild reaction conditionsThiol preparationToxic materialLiquid surfaces
The invention relates to a dimethyl cysteamine hydrochloride synthetic process. The dimethyl cysteamine hydrochloride is synthesized by taking isobutyraldehyde as an initial raw material through reactions of condensation, reduction, ring opening and ring closing, and ring opening. The process has the beneficial effects as follows: by replacing ammonia gas with ammonium hydroxide in a condensation reaction, and by directly putting a sodium borohydride solution from a place below a liquid surface to a reaction system in a reduction reaction, the reaction efficiency is improved; in the ring-opening reaction, phenylhydrazine is reserved as a ring-opening reagent; a ring-opening product is subjected to ring closing again in a system without performing separation; and then the product after being subjected to ring closing is rectified and purified, and is subjected to ring opening in an acidic condition to obtain a target compound, so that residual amount of a toxic substance which refers to phenylhydrazine is greatly reduced.
Owner:杭州扬帆化工科技有限公司
Method for gas-phase synthesis of meta-methyl methyl phenate
InactiveCN1546447AEasy to prepareLow costEther preparation by ester reactionsActivated carbonMolecular sieve
The invention provides a process for synthesizing 3-methylanisole through gas phase synthesizing, wherein the catalyst employs activated charcoal or molecular sieve or activated alumina, preferably the catalyst through solution treating of the alkaline metal or the alkaline earth fluoride or hydroxide compound. The preparation process comprises the steps of, preparing the disposed substance in solution of certain concentration, charging catalyst when stirring, dipping, drying and forming. The invention can realize high yield and selectivity for p-methylanisole.
Owner:NINGXIA UNIVERSITY
Synthesis method of hydroxyl-terminated liquid fluororubber modified polyurethane modulus gradient material
The invention provides a synthesizing method of a hydroxyl-terminated liquid fluorine rubber modified polyurethane material with gradient modulus. The method comprises the steps that 1, polyether diol with a low molecular weight, hydroxyl-terminated liquid fluorine rubber and aromatic diisocyanate serve as the raw materials to synthesize an isocyanate-terminated modified polyurethane prepolymer; 2, the product in the first step is mixed with different mole ratios of aromatic diisocyanate, a cyclotrimerization reaction is conducted in a solvent in the ontological status, and the hydroxyl-terminated liquid fluorine rubber modified polyurethane material with the gradient modulus is obtained finally. The synthesizing method has the advantages that the reaction system is low in viscosity, and synthesis of the isocyanate-terminated polyurethane prepolymer is promoted; the method is novel, the reaction is easy to control, and the product is good and stable in quality. The obtained polyurethane material with the gradient modulus is good in toughness, temperature resistance and chemical medium resistance, and the elasticity modulus has gradualness along with changes of temperature.
Owner:承德京工卓能新材料科技有限公司
Process for smelting magnesium through melting reduction
The invention relates to a process for smelting magnesium through melting reduction. The process takes dolomite as main raw material, alumina and silicon dioxide as slagging agents and ferrosilicon alloy as a reducing agent, and comprises the following steps: 1, calcining dolomite to obtain calcined dolomite; 2, proportioning four materials, namely calcined dolomite, alumina, silicon dioxide and ferrosilicon alloy in certain percentage by mass; 3, uniformly mixing four proportioned furnace burdens, putting the mixture into a reaction container and performing reduction reaction at 1,550 to 1,650 DEG C under the pressure of 1,000 to 4,000 Pa; and 4, performing condensation and collection on the obtained magnesium vapor to obtain magnesium metal. As the furnace burdens are in a completely melted state at about 1,600 DEG C, reaction is performed in a fully liquid state, thus reaction speed is greatly raised. Meanwhile, the furnace burdens need no crushing, fine grinding or briquetting andcan be directly mixed and put into the reaction container, so the reaction is simple to control and easy to operate.
Owner:CHONGQING UNIV
Ion-bridged salt-tolerant polymer thickening agent as well as preparation method and application thereof
ActiveCN114149538AHigh temperature and salt resistanceMild reaction conditionsDrilling compositionPolymer scienceBackbone chain
The invention discloses an ion bridging salt-tolerant polymer thickening agent as well as a preparation method and application thereof, belongs to the technical field of preparation of polymer thickening agents, and aims to solve the technical problems that fracturing fluid which is just prepared before a cross-linking agent is injected is too high in viscosity and difficult to inject. The preparation method comprises the following steps: mixing maleic anhydride and initiators azodiisobutyronitrile and dimethylformamide, then adding acrylamide for reaction, and after the reaction is completed, carrying out reduced pressure distillation to remove a solvent, thereby obtaining the ion-bridged salt-tolerant polymer thickening agent. Before the ion bridging salt-tolerant polymer thickening agent is injected into a stratum with sand, maleic anhydride is partially hydrolyzed, intramolecular winding is caused by the disadvantage of the distance between molecules, the viscosity is reduced, and injection is convenient; meanwhile, the stratum water contains divalent ions such as Ca < 2 + > and Mg < 2 + >, metal ions are captured through ortho-position carboxyl, complexing, bridging and crosslinking are carried out, the rigidity of a molecular main chain is increased, and the side effect of the metal ions is reduced. The temperature resistance and the salt resistance of the thickening agent can be obviously improved.
Owner:XIAN AODE PETROCHEM ENG TECH CO LTD
Removal of calcium and magnesium ions of concentrated liquor in urban refuse landfill by virtue of multiple precipitation method
InactiveCN105217751AReduce solubilityEasy to dehydrateWater contaminantsWater/sewage treatment by flocculation/precipitationWastewaterAmmonia
The invention relates to removal of calcium and magnesium ions of concentrated liquor in a urban refuse landfill by virtue of a multiple precipitation method. The agent added into the concentrated liquor is ammonium phosphate and sodium hydroxide, and ammonia dissociated from ammonium phosphate serves as a ligand substance of a precipitate. The adding quantity is 500-2000 ppm and the accurate value of the added quantity is determined according to the actual content of the calcium and magnesium ions in the waste water. To add sodium hydroxide is to maintain the pH value of a mixed liquid at about 8, and the input quantity is determined according to the pH value of the wastewater. The removal provided by the invention has the advantages of being small in mud output and high in reliability. As the precipitate product of the concentrated liquor in the treatment process can be prevented from returning into a percolate treatment system as being finally solidified and buried, a metal hydroxide precipitation method and a metal carbonate precipitation method which are relatively large in mud output are not suitable for treatment of the concentrated liquor.
Owner:胡明成
Method for preparing flame-retardant polymer containing pyridine groups
ActiveCN104177531AGood flame retardancy and thermodynamic stabilityStrong surface adhesionEmulsionChain transfer
The invention discloses a method for preparing a flame-retardant polymer containing pyridine groups. The method comprises the following steps of (1) adding styrene, acrylonitrile, 2-vinyl pyridine, dibromostyrene and an emulsifier into a dispersant and stirring to obtain an emulsion; (2) adding an initiator and a chain transfer agent into the emulsion and reacting, wherein a reaction mixture is obtained after the reaction is completed; (3) adding a demulsifying agent into the reaction mixture, fully stirring and carrying out solid-liquid separation to obtain a solid product which is a crude product, and (4) sequentially washing the solid product with water and methanol, and after the washing is completed, drying to obtain the finished product. The product prepared by the method has the advantages of good flame-retardant property, good thermodynamic stability and strong surface adhesion force and has a wide range of application.
Owner:SHANDONG TIANYI CHEM
Method for synthesizing progesterone midbody 3beta-hydroxy-5-pregnene-20-ketone
The invention relates to a method for synthesizing progesterone midbody 3beta-hydroxy-5-pregnene-20-ketone. By the method, a refining procedure and a by-product oxidation recovery processing procedure of a traditional synthesizing process are saved. The obtained midbody does not need to be refined, the once quality yield is more than 86%, and the product purity is more than 99.0%.
Owner:HUAZHONG PHARMA
A kind of lithium battery cathode material precursor with mesoscopic structure and preparation method thereof
ActiveCN110282665BReaction control is easyReduce manufacturing costCell electrodesNickel compoundsLithium hydroxidePhysical chemistry
The invention discloses a lithium battery cathode material precursor with a mesoscopic structure and a preparation method thereof. The method comprises the following steps: (1) one-step co-synthesis: mixing the lithium salt solution and the nickel-cobalt-manganese mixed solution, adjusting the pH value to 5.5-7.5 through a carbon dioxide-lithium hydroxide buffer system, and stirring for 2-5 hours; (2 ) Two-step co-synthesis: Concentrate the product obtained in step (1) until the volume is reduced by 1 / 2 to 2 / 3, pass through protective gas to maintain the pressure at 1.01 to 10.0 MPa, and then perform solid-liquid separation after aging for 5 to 24 hours , to collect the solid phase product; (3) pyrolyze the solid phase product in a vacuum, and then dry it at 90-130°C. The reaction process of the present invention does not require an external complexing agent, and a nano-scale, independent lithium-nickel-cobalt-manganese quaternary precursor spherical particle with a mesoscopic structure can be prepared, which simplifies reaction control and reduces production costs.
Owner:尤尼瑞克科技(成都)有限公司
A kind of siloxane copolymer containing ethylphenyl siloxane chain unit and preparation method thereof
The invention relates to the field of organic polymer chemistry, and specifically relates to a siloxane copolymer containing ethyl phenyl silica chain links and a preparation method thereof. The preparation method comprises the following steps: taking ethyl phenyl dialkoxysilane and dimethyl dialkoxysilane as the raw materials, carrying out hydrolysis condensation reactions in the presence of an anionic type or cationic type hydrolysis catalyst to generate oligomer composed of ethyl phenyl silica chain links and dimethyl silica chain links, then mixing the obtained oligomer with end-capping reagents with different structural types, carrying out reactions in the presence of an anionic type or cationic type polymerization catalyst, and subjecting the reaction products to neutralization / catalyst decomposition and reduced pressured distillation to remove low-boiling-point substances so as to obtain poly(dimethyl-ethylphenyl)siloxane copolymer with ends capped by different functional groups. The species of the monomer used in the provided method are few, the polymerization reaction conditions are mild, the reaction process control is simple, the copolymer structure is uniform, and the performance of the copolymer is excellent, and the provided method is suitable for massive industrial production.
Owner:山东宝龙达新材料有限公司
A kind of preparation method of iron phosphide loaded graphene foam composite material
ActiveCN110124703BComplete structureUniform compositionMaterial nanotechnologyPhysical/chemical process catalystsNanoparticlePyrrolidinones
A method for preparing iron phosphide loaded graphene foam composite material, belonging to the field of functional nanomaterials. This method is through Fe(NO 3 ) 3 ·9H 2 O can controllably catalyze the structural evolution and carbonization of polyvinylpyrrolidone during the sintering process. Combined with the subsequent CVD phosphating process, the composite structure on the iron phosphide-loaded graphene foam is directly generated, and the iron phosphide-loaded graphene foam composite material is obtained. Iron phosphide nanoparticles have a nearly spherical shape, their size can be adjusted between 30 and 500nm, and they can be tightly combined with graphene foam and are reliable. The iron phosphide nanoparticles are evenly distributed and tightly combined with the graphene foam matrix. The composite material has uniform composition and structure, simple process, high repeatability, novel method and low cost, making it very suitable for large-scale promotion.
Owner:UNIV OF SCI & TECH BEIJING
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