42 results about "N-methylpyrrolidine" patented technology

The invention discloses a high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane, which is prepared by comprising the following steps: adding the following raw materials in percentage by weight: 7.0%-26.0% of cellulose acetate, 2.0%-16.0% of additives, 0.1%-5.0% of nano-titanium dioxide, 0.05%-0.1% of graphene, and a dimethylformamide or dimethylacetamide, N-methylpyrrolidine and acetone mixed solvent into a dissolving tank according to certain sequence, stirring and dissolving for 3-15h to be full and even at 25-90DEG C, thus obtaining blended forward osmosis membrane casting liquid; and preparing the high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane on a supporting material by using a phase conversion method. According to the prepared forward osmosis membrane, 1M NaCl and deionized water are respectively taken as driving liquid and feed solution, the flux of pure water can reach more than 17.5L / m<2>.h during testing time of1h and the backward salt flux is less than 3.0g / m<2>.h.

The invention relates to technology for synthesizing an intermediate in the medicinal and chemical industry, in particular to a catalyst for catalytic synthesis of N-methylpyrrolidine and a synthesis method thereof. The catalyst consists of a carrier and a catalytic activity component, wherein the carrier is a gamma-Al2O3 or HZSM series molecular sieve; the catalytic activity component is a simple substance of metal M or an oxide thereof; the catalytic activity component accounts for 0.5 to 20 percent of the total weight of the catalyst; and the granular size of the catalyst is 4 to 20 meshes. The catalyst is prepared by a kneading and extruding method or a dipping method. The catalyst has the advantages of simple preparation, low price of raw materials and easy purchase; and when used the catalytic synthesis of N-methylpyrrolidine, the catalyst has the advantages of mild catalytic reaction condition, low three-wastes and no pollution, wherein the conversion rate of tetrahydrofuran is substantially kept over 80 percent and the yield of the N-methylpyrrolidine is substantially kept over 60 percent.

The invention relates to a mesoporous IM-5 molecular sieve preparation method, which comprises: (1) dissolving an inorganic alkali or an organic alkali and a templating agent in water to prepare a mixed solution, and adding a microporous IM-5 molecular sieve to obtain a solid-liquid mixture, wherein a molar ratio of Z to B to R to H2O is 1:(0.01-0.03):(0.01-0.20):(5-40), Z is a microporous IM-5 molecular sieve (calculated as SiO2), the silicon oxide / alumina molar ratio of the microporous IM-5 molecular sieve is 40-200, B is an inorganic alkali or an organic alkali, R is a templating agent, the organic alkali is a quaternary ammonium alkali having a general formula NR14OH, and R1 is a C1-C2 alkyl or a 1,5-bis(N-methylpyrrolidine)pentane diquaternary ammonium alkali; and (2) carrying out hydrothermal crystallization treatment on the solid-liquid mixture obtained in the step (1) at a temperature of 120-200 DEG C, drying the solid obtained after the treatment, and calcining. According to the present invention, the prepared mesoporous IM-5 molecular sieve has intracrystal mesopores, and can provide high activity stability when the mesoporous IM-5 molecular sieve is used in toluene-methanol alkylation reactions.

The invention relates to a measurement method of N-methylpyrrolidine content of cefepime dihydrochloride material and relative agent, for evaluating the quality of cefepime dihydrochloride material and relative agent. The invention discloses a liquid chromatograph which comprises using carboxylic cationic column as analysis column, uses a conductive detector to check, preparing flow phase, preparing sample solution and reference substance solution, using test method to respectively inject the sample solution and reference substance solution into a liquid chromatograph, recording high pressureliquid chromatographs, and calculating the N-methylpyrrolidine content of the sample. The inventive chromatograph system has easy balance, short sample test time, better repeatability in preserved time, stable baseline, durable column, high quality of chromatograph peak of N-methylpyrrolidine, better repeatability, accurate, simple and reliable process.

The invention relates to technology for synthesizing an intermediate in the medicinal and chemical industry, in particular to a catalyst for catalytic synthesis of N-methylpyrrolidine and a synthesis method thereof. The catalyst consists of a carrier and a catalytic activity component, wherein the carrier is a gamma-Al2O3 or HZSM series molecular sieve; the catalytic activity component is a simple substance of metal M or an oxide thereof; the catalytic activity component accounts for 0.5 to 20 percent of the total weight of the catalyst; and the granular size of the catalyst is 4 to 20 meshes. The catalyst is prepared by a kneading and extruding method or a dipping method. The catalyst has the advantages of simple preparation, low price of raw materials and easy purchase; and when used the catalytic synthesis of N-methylpyrrolidine, the catalyst has the advantages of mild catalytic reaction condition, low three-wastes and no pollution, wherein the conversion rate of tetrahydrofuran is substantially kept over 80 percent and the yield of the N-methylpyrrolidine is substantially kept over 60 percent.

The invention discloses a high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane, which is prepared by comprising the following steps: adding the following raw materials in percentage by weight: 7.0%-26.0% of cellulose acetate, 2.0%-16.0% of additives, 0.1%-5.0% of nano-titanium dioxide, 0.05%-0.1% of graphene, and a dimethylformamide or dimethylacetamide, N-methylpyrrolidine and acetone mixed solvent into a dissolving tank according to certain sequence, stirring and dissolving for 3-15h to be full and even at 25-90DEG C, thus obtaining blended forward osmosis membrane casting liquid; and preparing the high-performance flat plate type cellulose acetate / nano-titanium dioxide blended forward osmosis membrane on a supporting material by using a phase conversion method. According to the prepared forward osmosis membrane, 1M NaCl and deionized water are respectively taken as driving liquid and feed solution, the flux of pure water can reach more than 17.5L / m<2>.h during testing time of1h and the backward salt flux is less than 3.0g / m<2>.h.

Provided are a device and method for separating N-methylpyrrolidine, water and tetrahydrofuran. The device comprises a crude product dehydration working section and a product refining working section. The crude product dehydration working section comprises a crude product intermittent column, a first condenser, a phase splitting tank, a backflow head and the like. The crude product intermittent column comprises a crude steaming column reactor and a crude steaming column. The product refining working section comprises a refining intermittent column, a second condenser, a transition cut fraction receiving tan and a product receiving tank. The refining intermittent column comprises a rectifying column reactor and a rectifying column located at the top of the rectifying column reactor. The crude product dehydration working section is communicated with the rectifying column reactor of the product refining working section through a crude product storage tank communicated with the crude steaming column reactor. A two-column intermittent rectifying process is adopted in the method, water and tetrahydrofuran are taken out through the crude product intermittent column, left raw materials are purified through the product refining working section, and high-purity N-methylpyrrolidine is obtained. The problems that a traditional device and technique are large in energy consumption, low in yield, high in production cost and troublesome in aftertreatment are solved.

The present invention discloses a nano-scale ultra-fine analcime preparation method, wherein an alkali source, a silicon source, an aluminum source, water and N-methylpyrrolidine are adopted as reaction raw materials and crystallization is performed for 5-200 h under autogenous pressure and 140-200 DEG C hydrothermal condition to obtain the small grain nanometer analcime. According to the present invention, the obtained nano-scale ultra-fine analcime has characteristics of simple process, pure crystal phase, high crystallinity, large specific surface, low cost and the like, and has wide application prospects in ion adsorption and purification.

The invention relates to a cleaning agent, in particular to a paint cleaning agent which is strong, powerful, economical, high-efficient, energy-saving, environment-friendly, novel and concentrated and a preparation method thereof. The paint cleaning agent is prepared by the following raw materials by weight percent: 15 to 25 percent of dimethoxy dipropylene glycol, 25 to 40 percent of N-methylpyrrolidine, 5 to 8 percent of ethanolamine, 20 to 30 percent of ethyl acetate, 5 to 10 percent of fatty acid ester, 15 to 25 percent of dimethyl ketone and 0.2 percent of fruity essence.