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216results about How to "Short crystallization time" patented technology

Method for preparing epoxide

The invention relates to a method for preparing an epoxide and mainly resolves the problems in the prior art such as the low activity of catalysts for production of the epoxide, poor effect of mass transference, and high cost of production. The invention well resolves the problems through adopting the technical proposal which selects cheap organic amine as a template with shorter crystallization time, carries titanium through posterior synthesis in the presence of inertia gas, grafts inorganic titanium to silicon dioxide framework with a hexagonal mesoporous structure to form a substance of active titanium with four coordinating structure, and carries out alkylation treatment to produce a catalyst of the epoxide. The method provided by the invention can be applied to the industrialized production of the epoxide.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for synthesizing SAPO-5 with diethylamine as a template and recovering template

The invention provides a method for synthesizing SAPO-5 by using diethylamine as template and recovering the template of the SAPO-5. The structural formula of the SAPO-5 is represented by aR x (SixAlyPz)O2, wherein, the x, y and z are a molar fraction of Si, a molar fraction of Al and a molar fraction of P respectively, and meet a relation of x+y+z =1; the R is the template; and the a is the mole number of the template, and a is between 0.5 and 2.5. The invention is characterized in that: the template adopts the diethylamine or mixture of nitrogenous organic substances mainly containing the diethylamine ; and the method comprises the following steps of: weighing the template, a silicon source, an aluminium source, a phosphorus source and water according to the mole amount of H2O on a molecular sieve with meshes between 0 and 500; preparing gel through sufficiently mixing and stirring the materials; crystallizing the gel at a temperature of between 160 and 350 DEG C with a reaction time not shorter than 0.1 hour; filtering, washing and drying after complete crystallization, and performing drying under a temperature of between 25 and 120 DEG C; heating up the gel to a temperature not higher than 250 DEG C after molecular sieve synthesis, and condensing and volatilizing diethylamine template which can be reused. The method has the advantages of simple preparation method, low cost and high product yield.
Owner:SHANGHAI SECOND POLYTECHNIC UNIVERSITY

Synthetic method of MCM-22 (Multiple Chip Module 22) molecular sieve

The invention relates to a preparation method of an MCM-22 (Multiple Chip Module 22) molecular sieve, which comprises the following steps of: firstly preparing a structure directing agent, and uniformly mixing the structure directing agent with a silicon source, an aluminum source, a boron source or an iron source, an organic template agent and water into glue, wherein the organic template agent can be dimethyleneimine and can also be a mixed template agent comprising the dimethyleneimine and one or more of hydrocarbons, organic amine, alcohols and ketones; and then synthesizing an MCM-22 molecular sieve material through the silicon source, the aluminum source, alkali, the organic template agent and the structure directing agent, carrying out hydrothermal crystallization and obtaining an MCM-22 molecular sieve product through conventional processes of filtering, washing, drying and roasting. The method disclosed by the invention has the main characteristic that the structure directing agent is added into gel, and compared with the prior art, the method disclosed by the invention has the advantages of low crystallization temperature, short crystallization time, high product yield, high product quality and the like. The MCM-22 molecular sieve product disclosed by the invention has excellent catalytic performances, such as catalytic cracking, olefin and benzene alkylation and the like.
Owner:CHINA PETROLEUM & CHEM CORP +1

A kind of recrystallization refining method of tipipenem ester

The invention discloses a method for purifying tebipenem by recrystallizing. Acetone and isopropyl ether are adopted as recrystallizing solvents, the operation is simple, heating or cooling equipment is not required, crystallization is realized at room temperature, crystallization time is short, and recrystallization yield is high and over 75 percent, so that the method is suitable for industrialproduction, the recrystallized product has short melting range, high purity which is over 99.9 percent by virtue of HPLC (high performance liquid chromatography) detection, and can be used as a raw material medicament in accordance with requirements to prepare a medicinal preparation for safe administration of patients.
Owner:深圳万乐药业有限公司

Preparation method of titanium-silicate molecular sieve having large particle size

The invention discloses a preparation method of a titanium-silicate molecular sieve having large particle size and belongs to the technical field of inorganic chemical synthesis. The preparation method comprises the following steps of synthesizing a crystalline material; introducing the crystalline material into a mixed solution comprising an inorganic silicon source, an inorganic titanium source, an organic template agent and water, controlling pH by virtue of an alkaline source, carrying out hydrothermal crystallization, filtering, washing, drying and calcining to obtain the titanium-silicate molecular sieve. By the preparation method, the deficiencies of the prior art are overcome and by the prepared titanium-silicate molecular sieve, the problem that titanium-silicate molecular sieve having small particle size is difficult to be separated from the product and recovered in the industry can be well solved. The titanium-silicate molecular sieve prepared by the preparation method, which is disclosed by the invention has the advantages that the average particle size is greater than 5mu m or more, the crystallization time is short, the product is high in purity, the method has good repeatability, the operation is simple and feasible and the process is easy to control.
Owner:ZHEJIANG JINHUA NEW MATERIALS

Method for gathering/recovering VE (Vitamins E), squalene and polyunsaturated fatty acids from deodorized distillate of plant oil

The invention discloses a method for gathering / recovering VE (Vitamins E), squalene and polyunsaturated fatty acids from the deodorized distillate of plant oil. Specifically, the method comprises the following steps: adopting urea and a solvent as addition agents; mixing the addition agents with the distillate so as to dissolve the addition agents in the distillate; carrying out flexible packaging, vacuum degassing and sealing; applying a super high pressure for quickly crystallizing and agglomerating saturated fatty acids, monounsaturated fatty acids, fatty hydrocarbons, sterols and the like in the distillate; adsorbing a large quantity of impurities with an inclusion compound; carrying out pressure filtering and separating to obtain filter residue and filtrate; removing the solvent from the filtrate to obtain the VE, squalene and polyunsaturated fatty acids with high concentration. According to the method, the recovery rates of the VE, squalene and polyunsaturated fatty acids are all more than 80%, and neutral oil can be reserved.
Owner:潘见

Method for preparing molecular sieve ZSM-5

The invention relates to a method for preparing a molecular sieve ZSM-5 by preparing a precursor glue solution, crystallizing, filtering, drying and roasting. The invention adopts two crystallization methods, one method comprises the following steps of: directly illuminating the precursor glue solution in a sealed container by adopting a microwave field, and crystallizing by utilizing the coaction of the microwave effect and the autogenous hydrothermal pressure of the glue solution; and the other method comprises the following steps of: heating the precursor glue solution in the sealed container by adopting saturated steam for crystallization treatment, wherein the heating and the crystallization treatment can be simultaneously carried out in the microwave field. The saturated steam for the crystallization treatment is crystallized at 170-180 DEG C for 1-6h, 1-10 percent by weight of inoculating seeds are added after aging the precursor glue solution and before crystallizing the precursor glue solution which is prepared by adopting a template-free preparation method. The method of the invention has the following advantages of simple and practical process and uniform temperature in the crystallization process, obtains the molecular sieve with high crystallinity, pure crystal phase, controllable grain size, wider range and short crystallization time, can improve the production efficiency, decrease the cost and save energy.
Owner:YUEYANG YITIAN CHEM

Double-micropore SAPO (silicoaluminophosphate)-34/SAPO-18 composite molecular sieve, and preparation method and application thereof

The invention relates to the field of molecular sieves, and particularly provides a double-micropore SAPO (silicoaluminophosphate)-34 / SAPO-18 composite molecular sieve, and a preparation method thereof. The method comprises the following steps of: (1) carrying out pre-crystallization on a raw material mixture A used for synthesizing SAPO-34 to obtain pre-crystallized liquid S1 which does not contain solids, and carrying out pre-crystallization on a raw material mixture B used for synthesizing SAPO-18 to obtain pre-crystallized liquid S2 which does not contain solids; and (2) mixing the pre-crystallized liquid S1 and the pre-crystallized liquid S2, carrying out crystallization, separating the solids from crystallized liquid, and carrying out roasting after drying is carried out or drying is not carried out. The invention also discloses the application of the double-micropore SAPO-34 / SAPO-18 composite molecular sieve in low carbon olefins prepared from organic oxygen-containing compounds. The ratio of the molecular sieve SAPO-34 to the molecular sieve SAPO-18 is adjustable, when the double-micropore SAPO-34 / SAPO-18 composite molecular sieve is applied to the industrial production of the low carbon olefins prepared from organic oxygen-containing compounds, an ethylene-propylene ratio in the product is adjustable, and the catalytic activity of the molecular sieve is high.
Owner:CHNA ENERGY INVESTMENT CORP LTD +1

Method for ultrasonically crystallizing rebaudiosideA

The invention discloses a method for ultrasonically crystallizing rebaudiosideA, which comprises the following steps of: charging stevioside and dissolvent according to the quality volume ratio (kg:L) of 1:4-10; stirring, charging and heating to be the temperature of 40-80 DEG C; constantly keeping the temperature at 30-90 minutes; fast reducing the temperature to be 10-25 DEG C with the velocity of 5-15 DEG C per minute; sequentially statically crystallizing and recrystallizing for 3-12 hours, wherein the ultrasonic wave is adopted to perform auxiliary crystallizing and recrystallizing during statically putting; stirring and performing the ultrasonic wave for 5-15 minutes every 30-90 minutes; and performing solid-liquid separation, dissolution in a washing way, membrane separation, reduced pressure distillation and spray drying to the recrystallized crystalloid to obtain the high-purity rebaudiosideA. The method has the crystallizing time of only 6-24 hours, the rebaudiosideA yield which is more than 75%, even crystallizing grains, and the rebaudiosideA purity which reaches up to be more than 95%, meets the standards of American FDA, can be produced on a large scale, and has obvious effect.
Owner:GANZHOU JULONG HIGH TECH INDAL

Method for promoting Beta molecular sieve synthesis

The invention provides a method for promoting Beta molecular sieve synthesis. According to the method, a silicon source, an aluminum source, inorganic alkali, a microporous template agent and crystalgrowth promoters R are sufficiently mixed; the obtained gel is subjected to short-time hydrothermal crystallization for fast preparing a Beta molecular sieve. The synthesized product is formed by stacking and connecting primary nanometer particles; the primary particle diameter is 10 to 30nm; the synthesis process is fast; the materials can be directly crystallized for 10 to 60 hours at the propertemperature; the crystal growth promoters are 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or N-isopropyl-2-pyrrolidone or a mixture of the 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-isopropyl-2-pyrrolidone. The cheap crystal growth promoters are used for fast preparing the Beta molecular sieve by a one-step method; the conventional crystal seed method is replaced for fast obtaining the Beta molecular sieve; the method belongs to the economic and fast Beta molecular sieve obtaining method. In addition, the prepared Beta molecular sieve also has the excellent catalyst performance; high isobutene conversion rate and tert-butylamine selectivity are shown in the isobutene amination reaction.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI

Preparation method of nickel hydroxide/graphene composite material for nickel-metal hydride battery positive pole

ActiveCN105591087AImprove electrochemical utilizationBuffer volume expansionCell electrodesGastight accumulatorsFiltrationMass ratio
The invention discloses a preparation method of a nickel hydroxide / graphene composite material for a nickel-metal hydride battery positive pole, and belongs to the technical field of nickel-metal hydride battery pole materials. The method comprises the steps that graphite oxide is used as a raw material to be pressed into 1 mg / mL suspension liquid, nickel nitrate of different masses is added into the suspension liquid, the mass ratio of graphite oxide to nickel hydroxide in the composite material is 1:5 or 1:9 or 1:13, the suspension liquid with the nickel nitrate added is subjected to ultrasonic wave dispersion, then urea is dropwise added into the suspension liquid, the mixture is transferred into a three-mouth flask after being stirred, then the three-mouth flask is placed into an Apex normal-pressure micro wave reaction synthesizer for a reaction, then vacuum filtration is carried out, the product is washed with deionized water and absolute ethyl alcohol to be neutral, vacuum drying is carried out, and therefore the nickel hydroxide / graphene composite material is prepared. The preparation method has the advantages that the temperature gradient is small, the reaction speed is high, heating is uniform, crystallization time is short and the yield is high, and the preparation method is applicable to large-scale commercialized production.
Owner:INNER MONGOLIA UNIV OF SCI & TECH
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