62results about How to "Increase the degree of hydrogenation" patented technology

A wax composition is provided having high melt temperature, flexibility, pliability and chemical stability. The wax composition includes an acetylated wax including an acetylated glyceride and, optionally, a plant-based wax. The wax composition is useful for candle wicks, dental floss, candle bodies and other articles where these properties are advantageous.

The invention relates to a method for producing water-white hydrogenated rosin, which comprises the following steps: using light color refined rosin obtained after purifying the rosin as hydrogenation raw materials, using a solvent for preparing solution, carrying out catalytic hydrogenation, then, separating out the solvent through distillation, and obtaining the water-white hydrogenated rosin. When the method provided by the invention is adopted, the water-white hydrogenated rosin with light color (the Lovibond color number of the yellow color is 0.3 to 1.0, and the Lovibond color number of the red color is 0.2 to 0.3), low iodine value and low abietic acid content can be obtained. Compared with the water-white hydrogenated rosin produced by a traditional method, the water-white hydrogenated rosin produced by the method provided by the invention has the advantages of lighter color, higher hydrogenation degree, better stability and lower cost, and the application value of products can be improved when the water-white hydrogenated rosin is applied to aspects such as electronics, paint, bonding agents, dyestuff and the like.

The invention discloses a high-performance nano magnesium-based hydrogen storage material and a preparation method thereof. The high-performance nano magnesium-based hydrogen storage material is prepared from the following components in percentage by mass: 93-97% of magnesium, and 3-7% of a graphene nickel and palladium supported catalyst. The preparation method for the high-performance nano magnesium-based hydrogen storage material comprises a ball-milling pretreatment step; a hydriding combustion synthesis step and a strong ball-milling after-treatment step. The nano magnesium-based hydrogen storage material prepared by the preparation method has high activity, high capacity and excellent hydrogen absorption and desorption performances.

A wax composition is provided having high melt temperature, flexibility, pliability and chemical stability. The wax composition includes an acetylated wax including an acetylated glyceride and, optionally, a plant-based wax. The wax composition is useful for candle wicks, dental floss, candle bodies and other articles where these properties are advantageous.

The invention belongs to the technical field of reactors and provides a reactor for an exothermic reaction to solve the problems of large size of the conventional tubular reactor and nonuniform reaction degree distribution and different heat removing requirement in the conventional tubular reactor. The reactor comprises a heat exchange type tube nest fixed bed section and a heat insulation type fixed bed section; the heat insulation type fixed bed section is positioned at a downstream of the heat exchange type tube nest fixed bed section; and the filling volume ratio of catalysts of the two sections is (0.2-5):1. The reactor can be used for various exothermic reactions such as preparation of isopropamide through acetone ammoniation, preparation of isopropanol through acetone hydrogenation, and preparation of cyclohexane through benzene hydrogenation, and has the advantages that the reactor is small in size and low in cost, processing is easy to realize, and yield can be improved.

The invention relates to the technical field of hydrogenation of thermoplastic elastomers, and particularly discloses a homogeneous catalytic hydrogenation method for a styrene-isoprene-styrene triblock copolymer. The homogeneous catalytic hydrogenation method is characterized by comprising the following steps: adding a catalyst b solution into a catalyst a solution, and performing aging to obtaina hydrogenation catalyst; dissolving a triblock copolymer SIS into cyclohexane, and placing the mixed material into a hydrogenation reaction kettle, under stirring conditions performing vacuumizing and raising the temperature, adding the hydrogenation catalyst into the hydrogenation reaction kettle, filling the reaction kettle with a hydrogen gas, and performing a hydrogenation reaction; and performing cooling to a room temperature after the reaction is completed, taking out a hydrogenation glue liquid, adding hydrochloric acid dropwise into the glue liquid, performing flocculation with anhydrous ethanol, and performing vacuum drying to obtain the product. According to the method provided by the invention, the catalyst does not need to be specifically removed, the experimental operation is simple and easy to implement, the catalyst efficiency is improved, the usage amount of the catalyst is reduced, meanwhile, the thermoplastic elastomer SIS with a high molecular weight can be hydrogenated under a lower temperature, and the method has good hydrogenation selectivity.

A hydrogenation method for a polymer comprising an olefin unsaturated bond is disclosed. The method includes bringing a solution of the polymer comprising the olefin unsaturated bond into contact with hydrogen in reactors under a hydrogenation condition and with the existence of a hydrogenation catalyst. The method is characterized in that the reactors are at least two reactors in series connection, the first reactor is formed by combining a tower reactor or a stirring reactor with a static mixer, materials in the reactors are allowed to be in a near complete mixing state through controlling the recycle ratio of the first reactor, the recycle ratio of the first reactor is 1-40:1, the second and latter reactors are tower reactors, and materials in the second and latter reactors are in a near plug-flow state. The method can allow the hydrogenation degree of the polymer to reach an ideal value stably.

The invention relates to the field of copolymers, and discloses a method for preparing polymers. The method includes steps of (1), mixing glue solution of unsaturated polymers and hydrogenation catalysts with one another; (2), sequentially carrying out first hydrogenation reaction and second hydrogenation reaction on mixtures obtained at the step (1) in the presence of hydrogen; (3), removing solvents in reaction products obtained at the step (2). The hydrogenation catalysts contain organic compounds of organic aluminum and metal of VIIIB groups. The reaction temperatures of the first hydrogenation reaction range from -10 DEG C to 15 DEG C, and the reaction temperatures of the second hydrogenation reaction range from 40 DEG C to 120 DEG C. The method for preparing the polymers has the advantages that the hydrogenation reaction activity of the hydrogenation catalysts and the hydrogenation degrees of hydrogenation products can be improved, and the method is easy to operate and implement, short in reaction time and low in preparation cost.

This invention relates to a method for hydrogenating styrene-series thermoplastic elastomer with N2H4.H2O / H2O2 / catalyst system. The method comprises: (1) preparing styrene-series thermoplastic elastomer latex; (2) hydrogenating styrene-series thermoplastic elastomer latex with N2H4.H2O / H2O2 / catalyst system. The method does not need high-pressure apparatus, compressed H2, noble metal catalyst or a large amount of solvent. The product has hydrogenation degree of 85% and gel content lower than 2%. The method has such advantages as simple process, high stability, high reliability, no pollution and wide applications.

The invention discloses a composite material with nano-nickel particles and nano-palladium particles on graphene and a preparation method of the composite material. According to the composite material, a graphene surface is loaded with the nano-nickel particles and the nano-palladium particles with regular morphology and uniform particle size distribution, wherein the mass percent of graphene is 40%-80%, the mass percent of the nano-nickel particles is 10%-30%, and the mass percent of the nano-palladium particles is 10%-30%. Raw materials for the preparation method are available and lower in cost; the method is simpler and easy to operate. The synthesized composite material with bi-metal nano-nickel particles and nano-palladium particles on graphene not only has excellent characteristics of graphene, but also has excellent catalytic performance of nickel and palladium nanoparticles and can be widely applied to the fields of catalysts, hydrogen storage materials, battery materials, supercapacitors and the like.

The invention provides a nitrile rubber selective heterogeneous hydrogenation catalyst and a preparation method and a hydrogenation method thereof. The nitrile rubber selective heterogeneous hydrogenation catalyst uses silicon dioxide hollow microspheres with rich big holes as carriers, and uses active metal M as carriers; through being metered by using the total quantity of the nitrile rubber selective heterogeneous hydrogenation catalyst as 100 weight percent, the load quantity of the active metal M is 1 weight percent to 8 weight percent; the active metal M comprises Pd or Rh. The catalyst is obtained by loading the active metal M onto the silicon dioxide hollow microspheres with rich big holes by a coupling grafting method. The method of the nitrile rubber selective heterogeneous hydrogenation completed by using the catalyst comprises the step of mixing the nitrile rubber selective heterogeneous hydrogenation catalyst and nitrile rubber. The invention also provides hydrogenation nitrile rubber obtained by the method. The nitrile rubber selective heterogeneous hydrogenation method completed by using the catalyst and provided by the invention has the advantages that the hydrogenation degree is high; the selectivity is 100 percent.

The invention provides a coal hydrogenation gasification method. The coal hydrogenation gasification method comprises the following steps: introducing hydrogen into a catalyst to be activated, and generating activated hydrogen; and mixing the activated hydrogen and coal powder to have a gasification reaction. According to the coal hydrogenation gasification method, by virtue of a way of catalytically activating the hydrogen, active hydrogen free radicals are provided for the coal hydrogenation gasification process, and the active hydrogen free radicals are promoted to have a coupling reaction with a coal primary pyrolysis product, so that the hydrogenation degree of the coal primary pyrolysis product can be increased, and the yield of methane and light-weight oil products in the coal hydrogenation gasification product can be increased.

A hydrogenation method for activation of a hydroxy-terminated butyronitrile catalyst belongs to the field of hydrogenation catalysis. Raw hydrogenation materials adopted by the method comprise liquid hydroxy-terminated butyronitrile without any termination protection treatment and liquid hydroxy-terminated butyronitrile using hexamethyldisilazane for termination protection treatment. An activation method of the catalyst mainly comprises the steps of adding organic compounds such as alcohol and ketone as promotors and conducting selective hydrogenation on unsaturated double bonds of a polymer at 80-100 DEG C and 0-5 MPa for 2-12 h. According to the hydrogenation method, few organic compounds such as the alcohol and the ketone are used as the promotors, so that the reactivity of the catalyst is improved effectively, and the hydrogenation degree is increased greatly. In addition, the catalyst consumption required for reaching the same hydrogenation degree is reduced greatly, and the cost is saved significantly. According to the hydrogenation method, the high hydrogenation degree of the liquid hydroxy-terminated butyronitrile without any pretreatment is achieved for the first time, which cannot be achieved by other catalyst systems at present.

The invention relates to a method for preparing hydrogenated natural rubber (HNR) using an emulsion process. The method comprises the following steps: performing hydrogenation modification on natural rubber in natural latex by adopting a hydrazine hydrate / hydrogen peroxide / boric acid catalytic system; and flocculating by using an aqueous solution of 2% CaCl2 and drying, thereby obtaining the HNR with different hydrogenation degrees. According to the catalytic system, NR main chain hydrogenation can be catalyzed in an emulsion state; the gel content and decomposition temperature can be increased along with the increase of the NR hydrogenation degree, and a glass-transition temperature is slightly increased; and the crosslinking density of vulcanized rubber is increased along with the increase of the hydrogenation degree. Therefore, after hydrogenation, the flexibility of the HNR is reduced, and the thermal stability is improved; and the hydrogenation degree is increased, and the crystallization capacity of the HNR is decreased. The hydrogenation of the NR is expected to improve the aging resistance of the rubber.

The invention provides a nano magnesium-based hydrogen storage material and a preparation method thereof. The nano magnesium-based hydrogen storage material is prepared from magnesium and a graphene loaded titanium dioxide and scandium trioxide catalyst. The preparation method of the nano magnesium-based hydrogen storage material comprises the following steps: a pretreatment step: mixing magnesiumpowder with graphene-loaded titanium dioxide and scandium trioxide catalyst powder according to the ratio in the nano magnesium-based hydrogen storage material to obtain mixed powder; a hydrogenationcombustion synthesis step: performing hydrogenation combustion synthesis on the mixed powder to obtain a magnesium-based hydrogen storage material; and a post-treatment step: carrying out ball milling on the magnesium-based hydrogen storage material to obtain the nano magnesium-based hydrogen storage material. The nano magnesium-based hydrogen storage material prepared by the method has the characteristics of high activity, high capacity and excellent hydrogen absorption and desorption performance.

The invention relates to the field of copolymer hydrogenation, and discloses a hydrogenated block copolymer as well as a preparation method and application thereof. The hydrogenated block copolymer isobtained by hydrogenating a styrene-isoprene block copolymer, and in the styrene-isoprene block copolymer, the content of a styrene segment is 10-90% by weight, and the content of an isoprene segmentis 90-10% by weight; wherein the content of unsaturated C6 rings in the hydrogenated block copolymer is not more than 5wt%, and the content of straight-chain double bonds in the hydrogenated block copolymer is not more than 5wt%. A benzene ring and an isoprene segment in the styrene-isoprene block copolymer have an extremely high hydrogenation degree. The hydrogenated block copolymer has an excellent comprehensive performance. When the hydrogenated block copolymer is used as an optical material, the material is light, thin, transparent and bright; when the hydrogenated block copolymer is usedas a medical material, the material is transparent, pure, safe and reliable; and when the hydrogenated block copolymer is used for preparing a food container, the food container is extremely clean.

Proposed is a process for the continuous hydrogenation of carbon-carbon double bonds in an unsaturated polymer based on a conjugated diolefin and at least one other copolymerizable monomer to produce a hydrogenated polymer, in the presence of a solvent and a homogeneous or heterogeneous catalyst, wherein said unsaturated polymer, said homogeneous or heterogeneous catalyst and hydrogen are passed through a reactor equipped with static internal elements.

The invention relates to the hydrogenation field of butyronitrile latex, and discloses a hydrogenation method of butyronitrile latex. The method includes steps of (1), mixing butyronitrile latex, hydrogenation catalyst and ligand; (2), orderly performing first hydrogenation reaction and second hydrogenation reaction on the mixture obtained in step (1) in the presence of hydrogen, wherein the reaction temperature of the first hydrogenation reaction is 0-30 DEG C, and the reaction temperature of the second first hydrogenation reaction is 50-180 DEG C; (3), removing solvent in the reaction product obtained in step (2). The method is applied to perform hydrogenation on the butyronitrile latex, improve the hydrogenation activity of the hydrogenation catalyst and hydrogenation degree of the hydrogenation product; the hydrogenation product is free from obvious gel growth by comparing with the nitrile rubber before the butyronitrile latex before hydrogenation; moreover, the hydrogenation method is simple in operation, short in reaction time, easy to practice, and low in hydrogenation cost.

The invention provides a method for preparing temperature-control hydrogenation catalyst and an application in chemigum hydrogenation. The method of the invention uses a metal catalyst having a formula of MaXmLb to realize the hydrogenation of butyronitrile latex and recycle noble metal by the following technical scheme, wherein M is rhodium, X is Cl and L is phosphine compound. The technical scheme comprises the steps of: adding chemigum, solvent, catalyst and trivalence phosphine compound into a reaction device, using a hydrogen substitution system, pressurizing to 0.5 to 5 Mpa, heating to 100 to 175 DEG C, keeping temperature for 3 to 24 hours, adding polyethylene glycol and n-heptane into the resultant of reaction after finishing reaction, stirring 30 min, standing, layering, and then taking out the chemigum solution on upper layer, wherein the solution on lower layer contains the separated catalyst. The method of the invention ensures the chemigum hydrogenation catalyst having a fine temperature-control separating effect and improves the hydrogenation effect of the catalyst so the hydrogenation degree of the prepared chemigum is higher.

The invention discloses a hybridized dendrimer-loaded bimetal metal nanoparticle catalyst as well as a preparation method and application thereof. The hybridized dendrimer-loaded bimetal metal nanoparticle catalyst is a compound using hybridized polypropyleneimine (PPI) as a carrier and ruthenium and rhodium as metal nanoparticles. The preparation method comprises the following steps: modifying a primary amine group at the periphery of integral-algebra polypropyleneimine by using fifteen-element triene nitrogen heterocycle (MAC) to synthesize a novel hybridized dendrimer loading fifteen-element triolefin large ring on the surface and having different-algebra PPI; and then by adopting a method of co-complexing-reducing with two kinds of metal ions and using GnPPI-M (n=2, 3, 4, 5) as a carrier, preparing Ru / Rh bimetal DTNs with different Ru / Rh proportions, and by using the Ru / Rh bimetal DTNs as a catalyst, performing catalytic hydrogenation on butadiene-acrylonitrile rubber. The catalyst prepared by adopting the preparation method has excellent catalytic activity and selectivity, and can be recycled.

The invention provides a ternary catalysis system used for selective hydrogenation of a conjugated diene containing polymer. The ternary catalysis system comprises organic acid nickel, aluminum alkyl and an amino compound. The amino compound in the catalysis system and an organic acid nickel compound firstly form a complex product, and then the complex product and the aluminum alkyl are subjected to ageing processing, so that an optimal quantitative proportion relationship between Ni+ and Ni0 is achieved, and the hydrogenation activity of the catalyst is more stable. By adoption of the ternary catalysis system, the reaction of the conjugated diene containing polymer in the hydrogenation process becomes milder, and the hydrogenation efficiency and the hydrogenation degree of the polymer are finally improved.

The invention discloses a catalyst, comprising a carbon nano-tube and a main active hydrogenation component, wherein in the catalyst, the carbon nano-tube is used as a catalyst carrier carried with the main active hydrogenation component, and the main active hydrogenation component is a conventional metal catalyst for catalytic hydrogenation reaction in the field of hydrogenation reaction. The invention further discloses a preparation method for the catalyst, and a preparation method for the homopolymer or copolymer of cyclohexyl ethylene. In the preparation methods disclosed by the invention, hydrogenation can be performed on the polymer solution of polystyrene or styrene copolymer in certain conditions by selecting special catalyst, thereby obtaining the homopolymer or copolymer of cyclohexyl ethylene.

The present invention discloses an unsaturated copolymer hydrogenation method, which comprises: (1) dissolving a unsaturated copolymer in an organic solvent, and carrying out inflation discharge deaeration; (2) adding a hydrogenation catalyst and a ligand, wherein the hydrogenation catalyst has the following general formula: M1aM2bXmLn; (3) introducing hydrogen, stirring, and carrying out a reaction, wherein the reaction conditions comprise that the reaction temperature is 0-30 DEG C, the hydrogen pressure is 0.05-15 Mpa, and the reaction time is 1-120 min; (4) heating to a temperature of 50-180 DEG C, maintaining the hydrogen pressure at 0.1-15 Mpa, and carrying out a reaction for 1-20 h; and (5) removing the organic solvent in the reaction product obtained in the step (4). With the method of the present invention, the catalyst application cost can be reduced, the reaction is easy to perform, the hydrogenation reaction activity is high, the hydrogenation degree of the hydrogenated product can be significantly improved, and the product does not have the significantly-increased gel content.

The invention discloses a method for normal-pressure hydrogenation of an unsaturated polymer using a magnetic nano ferroferric oxide catalyst. The method is characterized by comprising the following steps of: adding latex or glue solution of an unsaturated polymer into a reaction container, heating up to 30-90 DEG C, adding reducing agent hydrazine hydrate and the magnetic nano ferroferric oxide catalyst into a hydrogenation system, stirring for hydrogenation reaction under the condition of air, and preparing the hydrogenated polymer after reaction for 1-24h, wherein the unsaturated polymer system is nitrile latex or butyl benzene latex, or solution of nitrile rubber or solution of isoprene rubber. The method uses the nano ferroferric oxide catalyst in a solution hydrogenation system and an emulsion hydrogenation system of a macromolecular unsaturated polymer for the first time, and after the hydrogenation reaction is completed, nano ferroferric oxide is recycled through simple filtering and washed with deionized water for reuse, and redundant hydrazine hydrate is removed by generating nitrogen and water by-products so as to prepare a very pure hydrogenated product.

The present invention provides a novel process for selectively hydrogenating the carbon-carbon double bonds in diene-based polymers which are present in latex form, this means as a suspension of diene-based polymer particles in an aqueous medium, using a Ruthenium or Osmium-based complex catalyst without any organic solvent.

The present invention relates to a heterogeneous two-component hydrogenation catalyst, a hydrogenated nitrile butadiene rubber, and preparation methods of the heterogeneous two-component hydrogenation catalyst and the hydrogenated nitrile butadiene rubber. The heterogeneous two-component hydrogenation catalyst preparation method specifically comprises: carrying out amino modification on a silica hollow microsphere carrier by using a coupling agent, loading an active component M1 and an auxiliary agent component M2 on the carrier, drying, and carrying out H2 reduction treatment to obtain the heterogeneous two-component hydrogenation catalyst, wherein the active component M1 is selected from Pd or Rh, preferably Pd, and the auxiliary agent component M2 is selected from Zr or Ti, preferably Zr. According to the present invention, the prepared heterogeneous two-component hydrogenation catalyst has advantages of high catalytic activity, high selectivity, good stability, relatively low preparation cost, mild hydrogenation condition, simple process and precious metal consumption reducing; the synthesis cost of the catalyst is effectively reduced by completely using the synergetic effect between the precious metal and the auxiliary agent; and the hydrogenation degree of the hydrogenated nitrile butadiene rubber preparation method is high, and the selectivity can achieve 100%.

The invention relates to the field of copolymer hydrogenation, and discloses a hydrogenated block copolymer as well as a preparation method and application thereof. The hydrogenated block copolymer isobtained by hydrogenating a styrene-butadiene block copolymer, in the styrene-butadiene block copolymer, the content of a styrene segment is 10-90wt%, and the content of a butadiene segment is 90-10wt%; wherein the content of unsaturated C6 rings in the hydrogenated block copolymer is not more than 5wt%, and the content of straight-chain double bonds in the hydrogenated block copolymer is not more than 5wt%. A benzene ring and a butadiene segment in the styrene-butadiene block copolymer have an extremely high hydrogenation degree and excellent comprehensive performance. When the hydrogenatedblock copolymer is used as an optical material, the material is light, thin, transparent and bright; when the hydrogenated block copolymer is used as a medical material, the material is transparent, pure, safe and reliable; and when the hydrogenated block copolymer is used for preparing a food container, the food container is extremely clean.

The invention discloses a medical-grade thermoplastic elastomer industrial production device and production method, wherein the medical-grade thermoplastic elastomer industrial production device comprises a reaction unit, a decatalysis unit, a steam stripping unit and a post-treatment unit, and the medical-grade thermoplastic elastomer industrial production device further comprises a raw material refining unit. The technical process provided by the invention has excellent continuity. Through process integration and control of process parameters, an SEBS product produced by the process has the advantages of easy control of 1,2 butadiene content and molecular weight, narrow molecular weight distribution, high hydrogenation degree, low ash content, bright blending with PP, and no crystal point, and meets the requirements of medical and health-grade SEBS products.