36results about How to "Short yield" patented technology

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 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.