36results about How to "Short yield" patented technology

The invention provides a method for synthesizing a polylactic acid which has no metallic residue and has controllable molecular weight. The method is as follows: a reaction solvent is added into lactide to prepare a lactide solution the mol concentration of which is between 0.5 and 1.5 M under the protection of inert gas, and an initiator and catalyst are added into the lactide solution in turn, and subjected to polymerization for 0.25 to 2 hours, wherein the mol ratio of the lactide to the initiator to the catalyst is 6-350 to 1 to 0.06-0.35; a terminator is added into the lactide solution, and subjected to termination reaction for 10 to 20 minutes, wherein the mol ratio of the initiator to the terminator is 1 to 1-5; and methanol is prepared, wherein the volume ratio of the reaction solution to the methanol is 1 to 10-20, the reaction solution is dripped into the methanol to form polylactic acid deposit, and the polylactic acid deposit is separated out, filtered, subjected to methanol washing for 2 to 3 times, and subjected to vacuum drying for 24 to 48 hours at a temperature of between 20 and 40 DEG C to obtain the product. The synthesis method can be performed under the condition of room temperature and normal pressure, has high product yield and simple technique, does not require the conditions of heating and decompression, is easy to operate, and can effectively control the molecular weight of the polylactic acid product; and the product has no metallic residue and can be used as a medical material.

The invention provides a preparation process for an inert anode material or an inert cathode coating material for aluminum electrolysis. The preparation process comprises the following steps of: (A) feeding aluminum into a reactor, vacuumizing and introducing an inert gas, adding a mixture of dried fluoborate and fluotitanate in the reactor and reacting to generate titanium boride and cryolite and separating to obtain the titanium boride; and (B) fusing the titanium boride with a titanium boride, tamping the mixture to the surface of a carbon cathode and sintering to form the inert cathode coating material for aluminum electrolysis; or uniformly mixing the obtained titanium boride with a carbon material, forming at high pressure and sintering at high temperature to form the inert anode material for aluminum electrolysis. The preparation process disclosed by the invention has the advantages of simplicity, no need of harsh reaction conditions and high yield of reaction product; the preparation process is used for preparing the inert anode material or inert cathode coating material for aluminum electrolysis; and the inert anode material or inert cathode coating material has favorable corrosion resistant performance, excellent conducting performance and thermal shock resisting performance; and the firmness of the inert anode material or inert cathode coating material meets the industrial service requirement.

The invention belongs to the technology field of plant natural product preparation, and specifically discloses a extracting liquid for extracting plant polyphenol from rapeseed cake or rapeseed peel, peanut shell, apple, persimmon, grape, citrus, radish, soybean, jujube, pomegranate peel, banana peel, sweet potato, haw peel, tomato, nut, oat or lichee and a extracting method. The extracting liquid is a hydrogen peroxide solution with a pH value of 7.5 to 10.0, a sodium hypochlorite solution with a pH value of 7.5 to 10.0, a potassium hypochlorite solution with a pH value of 7.5 to 10.0, or a calcium hypochlorite solution with a pH value of 7.5 to 10.0. The preparation method comprises following steps: grinding the raw materials mentioned above, sieving, extracting with the extracting liquid mentioned above, optionally carrying out a supersonic treatment or a microwave treatment during the extracting process, and removing the slag through a centrifugal separation treatment so as to obtain the plant polyphenol leaching liquid. The extracting liquid for extracting plant polyphenol and the extracting method has the advantages of wide plant polyphenol sources and a very good industrial promotion and application prospect.

The invention relates to a solid base catalyst and a method for synthesizing 3-chloro-2-hydroxypropyl-trimethyl-ammonium chloride based on the solid base catalyst. In the invention, ZnO (zinc oxide) or the composite catalyst of ZnO and KF (potassium fluoride) or the composite catalyst of ZnO and K2CO3 or the composite catalyst of ZnO / K2CO3 / NaOH is adopted as the solid base catalyst; the advantages of the two stages of reaction at the low temperature (0-15 DEG C) and the room temperature (18-25 DEG C) under the catalysis of the solid base catalyst are effectively combined, and trimethylamine hydrochloride, epichlorohydrin (ECH) and water are directly used as raw materials; and the invention has the advantages of mild reaction condition, less side reaction and high product purity and is easy to control. Continuous steam stripping reduced pressure distillation is adopted to refine the products, thereby not only simplifying the operation but also greatly reducing the energy consumption. Liquid-phase 3-chloro-2-hydroxypropyl-trimethyl-ammonium chloride can be directly used as the raw material to obtain the solid product the water content of which is less than 5 percent (weight percent), the ECH of which is not more than 5ppm (GC) and the DCP (dicumyl peroxide) content of which is not more than 10ppm (GC) through one-step spray drying. The method is simple, rapid and convenient to operate at high efficiency, and avoids using an organic volatile solvent.

The invention discloses a method for preparing zolpidem. The method comprises the step of subjecting 6-methyl-2-(4-methylphenyl)-imidazo[1,2-a]pyridine, which serves as a raw material, to a reaction with 2-bromo-N,N-dimethylacetamide under the action of photocatalysis, thereby obtaining the zolpidem. Compared with the prior art, the method has the advantages that environment-friendly and pollution-free LED light serves as an energy source, so that an environment-friendly sustainable development idea is embodied; and during the preparation of the zolpidem, five steps in the prior art are shortened to one step. According to the method, the preparation route is short, the preparation method is simple, the production cost is low, the product yield is high, the consumption of a solvent and the pollution to environments during blowdown are reduced, the implementation is easy, and thus, the industrialization is facilitated.

The invention relates to a method for preparing isopentenol from 3-methyl-3-butenol, which performs isomerization reaction on a raw material of 3-methyl-3-butenol to generate the isopentenol in the presence of a catalyst in an atmosphere containing hydrogen, wherein the reaction pressure is normal pressure, the reaction temperature is between 50 and 90 DEG C, the reaction time is between 25 and 40 minutes, the catalyst uses Al2O3 as a carrier, a load active component is metal Pd, the content of the Pd in the catalyst in percentage by weight is between 0.1 and 2.0 percent, the particle size of the catalyst is between 80 and 200 meshes, and the weight ratio of the raw material to the catalyst is 30-100:1. Compared with the prior art, the method has obvious improvement, the catalyst is simpler, and the content of the active component is lower, thus the preparation is easier and the cost is lower; the reaction condition is mild; and on the premise of ensuring the selectivity and the product yield of a perfect product, the reaction time is greatly shortened. The reduction of the preparation cost of the catalyst and shortening of the reaction time finally reduce the overall production cost greatly.

The invention discloses a method for catalytically synthesizing bisphenol F by phosphotungstic acid modified short-channel HPW-Zr / SBA-15. The method uses phosphotungstic acid modified short-channel HPW-Zr / SBA-15 as a catalyst, and phenol and formaldehyde as raw materials to catalyze the synthesis of bisphenol F. The catalyst used is polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (P123) as a template, tetraethyl orthosilicate as a silicon source, and phosphotungstic acid as a catalytic active component , zirconium oxychloride is used as a modifier, synthesized by one-step method, the preparation process is simple, the channel is short, it is beneficial to improve the mass transfer and reaction efficiency, the reaction activity is good, the reaction time is short, the catalytic efficiency is high, easy to separate, reusable, and the reaction There is no need to add any organic solvents during the process, which is green and environmentally friendly.

The invention discloses a process for preparing 3-deacetylate-7-aminocephalosporanic acid, belonging to the technical field of medicines. The method disclosed by the invention comprises the following steps of: directly catalyzing 3-deacetylate cephalosporin C extract with cephalosporin acylase, then acidifying and crystallizing, washing and drying to obtain solid 3-deacetylate-7-aminocephalosporanic acid. The method only requires one-step normal temperature cracking reaction and one crystallizing process, process rout is short, pollution is less, mole yield of product is more than 86%, and the method disclosed by the invention is applicable to industrialization production.

The invention provides a core-shell-structure silver-gold nanosheet based on epitaxial growth and a preparation method and application thereof. The method includes the steps that firstly, a silver nanosheet solution is prepared, then, chloroauric acid and ligand react in the alkaline environment, and a gold precursor solution is obtained; and a reducing agent, surfactant, a pH modifier, ligand or acetonitrile and the silver nanosheet solution are added to the gold precursor solution, and the core-shell-structure silver-gold nanosheet is obtained after the reaction. The ligand and chloroauric acid radial can generate coordination, a gold precursor is formed, the redox potential of gold is reduced, and the replacement reaction is prevented from being generated; the gold precursor is reduced into gold atoms through the reducing agent, the gold atoms are deposited on the surface layer of a silver nanosheet in an epitaxial growth mode, and the core-shell-structure silver-gold nanosheet is formed. The preparation process is simple and feasible; the shape and the size of the core-shell-structure silver-gold nanosheet are controllable; the excellent stability and the good optical property are achieved; wide application prospects are achieved in the fields of molecular detection and the like.

The present invention relates to a 6-hydroxy-3-hexenyl alkoxymethyl ether compound of the following general formula (1): HOCH2CH2CH = CHCH2CH2OCH2OCH2R1 (1), R1 represents a hydrogen atom, a normal alkyl group having 1 to 9 carbon atoms, or a phenyl group; the invention also relates to a method for preparing a 3, 13-octadecadien-1-ol compound of the following formula (6) from a 6-hydroxy-3-hexenyl alkoxymethyl ether compound (1): CH3 (CH2) 3CH = CH (CH2) 8CH = CHCH2CH2OH (6).

The disclosed high-yield synthesis method for cage polyamino silsesquioxanes comprises: at 50-80Deg, dripping the gamma-aminoprotriethoxy silane of 1mol into the mixed liquid with 5-10mol deionized water, 50-100ml solvent with ethanol and cyanogen, 0.1-0.3ml trialkylamine as structural inhibitor and 2-5ml catalyst with amine compound; at 50-80Deg, refluxing and stirring for 18h, and removing the solvent at normal temperature to obtain the coarse product; cleaning by deionized water with mass as 10-20 times then by the acetone; finally, vacuum drying. This invention can speed up hydrolysis and the structural form, decreases side reaction.

The invention discloses formula whey milk which is more suitable for infants. The formula whey milk comprises the following components in percentage by mass: 85.3 to 88.98 percent of whey, 10.0 percent of raw milk, 1.0 percent of vegetable oil and 0.02 to 0.1 percent of phospholipid. Compared with the prior art, the formula whey milk has rich nutrients; a technological process is simple, the costis low and the product yield is high; after production, the formula whey milk can be directly drunk; in the production process, a heating process is avoided to the greatest extent; 10 percent of raw milk is used particularly; a pasteurization process can be adopted in the process of producing fresh milk foods, the storage time is short and furosine is hardly generated; a normal temperature milk production process also can be used; and the formula whey milk is safe and reliable, is an ideal nutritious food in the growth and development period of the infants, is also a necessary food for the growth and development of children, is also a necessary food for supplementing nutrition for middle aged and elderly people, and is a nutrition supplement suitable for both young and old.

The invention relates to a direct molybdenum oxide alloying steelmaking process. It is characterized in that: the smelting process consists of the following steps: a. Put the molybdenum oxide raw material into the container or smelting furnace that is not filled or partially filled with steel or molten iron, and then continue to load steel or molten iron to keep the molybdenum oxide raw material in the Mixing in molten steel or iron for a certain period of time; b After steel or molten iron is calmed in a container or smelting furnace, a certain amount of reducing agent is added to the surface of steel or molten iron or slag; c Molybdenum in steel or molten iron in the later stage of smelting After the element content is stable, molybdenum-containing alloy is added to adjust the composition of steel or molten iron. The invention has the characteristics of simple operation of the molybdenum alloying smelting process, high yield of molybdenum alloying elements, short alloying smelting time, less smelting energy consumption, and low smelting cost. 15% steel smelting.