39results about How to "No high temperature and high pressure reaction" patented technology

The invention discloses a reverse demulsifier and its preparation method. The method comprises allowing reaction between methyl acrylate and ethylenediamine to obtain linear polyamidoamine, and allowing reaction between the linear polyamidoamine and epoxy chloropropane to obtain quaternary ammonium salt of linear polyamidoamine; allowing free-radical polymerization between polyoxyethylene nonylphenyl ether acrylate, acryloyloxyethyltrimethylammonium chloride and acrylamide in the present of an initiator and a terminator to obtain amphipathic cationic polymer; and mixing the quaternary ammonium salt of linear polyamidoamine, the amphipathic cationic polymer, a cationic surfactant and water to obtain the reverse demulsifier. The inventive reverse demulsifier has good demulsification effect on oil-in-water emulsion produced from oil field, and is suitable for chemical flooding produced fluid; and the inventive preparation method has low requirement for equipment, and is free of high-temperature high-pressure reaction.

The invention discloses a method for preparing a caesium-lead halide nanorod and the product obtained through the method. The method includes the steps that lead halide and octadecene are mixed to be stirred for 0.5-1.5 hours, and then oleylamine and oleic acid are added into a mixture in sequence to be stirred till the lead halide is completely dissolved; the lead halide is heated to 130-200 DEG C after being completely dissolved, then a caesium precursor solution is slowly poured into liquor, and caesium-lead halide is prepared through a thermal insulation reaction; after the reaction is completed, reaction liquid is subjected to centrifuging, separating and washing, and accordingly the caesium-lead halide nanorod is obtained. According to the method, the caesium-lead halide nanorod is synthesized in an organic phase system, the reaction temperature is 130-200 DEG C, and the method belongs to a low-temperature organic phase synthesis method; the method is easy to operate, high-temperature and high-pressure reactions can be avoided, safety is achieved, the size of the nanorod can be regulated and controlled through the reaction condition, the obtained caesium-lead halide nanorod is even in shape, good in crystal form, and wide in application prospect in the fields of solar cells, LEDs, panel display and the like.

The invention relates to a method for preparing a rubber auxiliary agent, and particularly discloses a method for preparing rubber peptizer 2,2-dibenzoylamino diphenyl disulphide (DBD). The method for preparing the rubber peptizer DBD is characterized by comprising the following steps of: performing ring opening reaction on benzothiazole to obtain a ring opening product; oxidizing the ring opening product to prepare diphenylamine disulphide; and performing acylation reaction on the diphenylamine disulphide and benzoyl chloride to generate the DBD. According to the method for preparing the rubber peptizer DBD, compared with the conventional process, the product cost is remarkably reduced; the method is favorable for popularization and application of the environmentally-friendly peptizer DBD, and simultaneously breaks through the situation that the product depends on import for a long term; the organic solvent is used as a reaction medium and can be recycled, so little three-waste is discharged; and the production flow is simple and easily controlled, high-temperature and high-pressure reaction does not exist in the method, the equipment investment is low, and the method is easy for production and operation.

The invention discloses a preparation method of terbutaline sulfate. The method comprises the steps: taking 3,5-dihydroxyacetophenone as an initial raw material, firstly, carrying out benzyl protection to obtain 3,4-dibenzyloxyacetophenone, carrying out copper bromide bromination and DMSO oxidation on 3,5-dibenzyloxyacetophenone to obtain 3,5-dibenzyloxyacetophenone aldehyde, carrying out reductive amination on 3,5-dibenzyloxyacetophenone aldehyde and tert-butylamine to generate 1-[3,5-di(benzyloxy)phenyl]-2-(tert-butylamino)ethanol, and finally carrying out hydrogenation debenzylation and sulfuric acid salification, to obtain terbutaline sulfate. Compared with the prior art, the method has the advantages that the used raw materials and auxiliary materials are cheap and easily available, the use of high-risk and highly-toxic reagents is avoided, high-temperature and high-pressure reaction is avoided, the operation is simple and convenient, the reaction conditions are mild, and the defects of long steps, low yield, potential safety hazards and the like in the prior art are overcome.

The invention discloses a production method of glycine. The glycine belongs to the field of preparation of amino acid. The glycine finished product is prepared through processes such as synthesizing, decoloring, crystallizing, centrifugal separation and drying based on monochloro acetic acid, ammonium hydroxide, activated carbon and 95% ethanol as raw materials, and a reaction kettle, a decoloring kettle, a crystallization kettle, a centrifugal machine and a vacuum drier as equipment. The production method has the advantages that the process is simple, the general equipment is adopted, no three wastes (waste gas, waste gas and solid waste) are discharged, high-temperature high-pressure reaction is not performed, the operation is convenient, the glycine is high in quality, and high-quality glycine can be produced as mass. The glycine can be applied to pharmaceutical treatment of diseases such as myasthenia gravis, progressive muscular dystrophy, gastric ester excess symptom, chronic enteritis and children hyperprolinemia, and can serve as a nutritive additive of chicken feed, serve as a seasoning and a preservative for foods and serve as an intermediate in agrochemical production.

The invention discloses a production method for methyl aspartate, belonging to the field of production of amino acids. According to the production method, methyl aspartate is prepared from aspartic acid powder, sulfuric acid with a concentration of 30%, solid acid and a methanol solution through production of sulfate of aspartic acid at first and esterification next. The production method has the advantages of usage of universal equipment, simple production process, no high-temperature and high-pressure reaction, environmental protection, high product output and capacity of producing a high-purity finished methyl aspartate product; and the finished methyl aspartate product is an intermediate for production of asparagine.

The invention discloses a preparation method of 2,2-difluoroethanol. 2,2-difluoroethanol is obtained by liquid-phase one-step reaction of 2,2-difluoroacetyl halide and a metal hydride. The method provided by the invention has the advantages of high product yield, simple reaction steps, mild reaction conditions and the like.

The invention relates to a method for preparing a medicine intermediate, and particularly discloses a method for preparing D-cysteine hydrochloride-hydrate. The method for preparing the D-cysteine hydrochloride-hydrate is characterized by comprising the following steps of: carrying out neutralization cyclization on L-cysteine hydrochloride to obtain a ring-closing product; carrying out racemization on the ring-closing product, adding revulsive, transforming and separating out a dextral intermediate; carrying out hydrolysis ring-opening on the dextral intermediate, oxidizing to obtain D-cystine; and carrying out electrolysis concentration and crystallization on the D-cystine to obtain the D-cysteine hydrochloride-hydrate. By transforming the L-cysteine hydrochloride into the D-cysteine hydrochloride-hydrate, the method for preparing the D-cysteine hydrochloride-hydrate greatly lowers the production cost, the D-cysteine hydrochloride-hydrate has high yield and good quality, less emission of three wastes as an organic solvent is used as a reaction medium; and the production flow is simple, no high-temperature and high-pressure reaction exists, the equipment investment is less, and the production operation is easy.

The invention provides a niraparib preparation method, which comprises: carrying out photocatalysis on a compound 1 and bromobenzene under a Pd catalyst to obtain a niraparib key intermediate; carrying out chiral resolution on the niraparib key intermediate, and coupling the niraparib key intermediate with NBoc-1H-indazole-7-carboxamide under the catalysis of copper bromide to obtain protected niraparib; and removing the protective color of the protected niraparib under the action of methanesulfonic acid, and obtaining the target product niraparib under tetrahydrofuran pulping. The preparation method of niraparib is simple in synthesis process route, high in preparation efficiency, small in damage to human bodies and the environment and low in synthesis cost.

The invention discloses a granulation method of an amino acid solution and belongs to the field of amino acid production. The granulation method utilizes an amino acid solution as a raw material and comprises concentration, granulation and packaging. The granulation method utilizes general equipment, has simple processes, is free of a high temperature and high pressure reaction, and realizes room temperature granulation and mass production of amino acid particles. The product is mainly used for preparation of a variety of organic and inorganic composite fertilizers.

The invention discloses a synthetic method of [(trifluoromethyl)thio]benzene compounds, particularly a method for converting substituted phenyl diazonium salts into [(trifluoromethyl)thio]benzene. Themethod comprises the following steps: under white light irradiation, adding an aryl diazonium salt, tris(2,2'-bipyridine)ruthenium(II) hexafluorophosphate and S-trifluoromethyl-4-methoxybenzenesulfonyl sulfate into a solvent and uniformly mixing the mixture; after mixing, reacting the mixture at the room temperature of 20-25 DEG C; determining the reaction ending time through spotting detection;after the reaction is finished, adding water for extraction; performing separation to obtain a liquid organic phase; drying the liquid organic phase with anhydrous Na2SO4; then removing a solvent; andperforming rapid separation with column chromatography to obtain a [(trifluoromethyl)thio]benzene compound. The method is mild in reaction condition, free of high-temperature and high-pressure reaction, safe in reaction condition and suitable for large-scale production and development.

The invention discloses an amino acid solution granulating method. The method belongs to the field of amino acid production. The raw materials used by the production method comprise an amino acid solution, and a finished product is prepared by the work procedures of concentrating, granulating, packaging and the like. The amino acid solution granulating method disclosed by the invention has the advantages: general equipment is utilized, a production technology is simple, high temperature and high pressure reaction is avoided, granulation at normal temperature is achieved, amino acid particles can be batch produced, and the product is mainly applied to preparing varieties of organic-inorganic compound fertilizer.

The invention relates to the technical field of pharmaceutical chemical preparation, in particular to a preparation method of pharmaceutical armillarisin A. The preparation method comprises the following specific steps: adding 3, 5-dihydroxybenzyl alcohol into ethanol, stirring and dissolving, adding ethoxymethylene ethyl acetoacetate, and stirring; dissolving metal sodium in ethanol to prepare sodium ethoxide; adding sodium ethoxide into the solution for reaction, standing and filtering to obtain a solid; dissolving the solid in purified water, adding activated carbon for decoloration, filtering to obtain filtrate, dropwise adding acid to adjust the pH value, and filtering to obtain an armillarisin A crude product; and putting the crude product into a mixed solution of absolute ethyl alcohol and purified water, adding ammonia water to dissolve the crude product, adding activated carbon to decolorize, filtering to obtain a filtrate, adding glacial acetic acid, cooling, crystallizing, filtering to obtain a refined armillarisin A product, and drying the refined product to obtain a finished armillarisin A product. Compared with the prior art, the method is simple in process operation, low in toxicity and high in yield, and the production cost can be further reduced. No catalyst is used, high-temperature and high-pressure reaction is avoided, reaction conditions are mild, and required equipment is simple.