44results about How to "Improve the conversion rate of hydrolysis" patented technology

The ester hydrolyzing method includes hydrolyzing ester in water to produce C1-C10 fatty acid or aromatic acid and C1-C4 fatty alcohol under the presence of ammonium salt of heteropoly acid as catalyst. The ammonium salt of heteropoly acid is obtained through the reaction between heteropoly acid in Keggin structure and inorganic ammonium salt or organic amine, the heteropoly acid is selected from phosphotungstic acid, silicotungstic acid, silicomolybdic acid and phosphomolybdic acid; the inorganic ammonium salt is selected from ammonium carbonate, ammonium nitrate, ammonium sulfate, ammonium phosphate and diammonium hydrochloride; and the organic amine is selected from fatty amine, alicyclic amine and arylamine. The said ester hydrolyzing method can obtain high conversion rate in relatively lower water/ester ratio and relatively short time, and the catalyst is cheap and easy to separate from the product.

The invention provides a low-temperature hydrolysis method for removing carbonyl sulfide in liquefied petroleum gas. The method comprises the following steps: mixing the liquefied petroleum gas after amine washing with an alcohol amine solution, and performing hydrolysis reaction under the action of a carbonyl sulfide hydrolysis catalyst to remove carbonyl sulfide and hydrogen sulfide in the liquefied petroleum gas and hydrogen sulfide generated by hydrolysis; separating the liquefied petroleum gas from the alcohol amine solution, then washing with water to obtain the refined liquefied petroleum gas and recycling the alcohol amine solution, wherein the adding amount of the alcohol amine solution is 0.1%-20% of the weight of the liquefied petroleum gas. By adopting the low-temperature hydrolysis method for removing carbonyl sulfide in the liquefied petroleum gas provided by the invention, carbonyl sulfide and hydrogen sulfide in the liquefied gas can be removed in one step under the condition of 10-60 DEG C, the step of removing hydrogen sulfide in a conventional process is eliminated, the process is simple, the activity of the catalyst is high, the service life is long and the conversion rate of carbonyl sulfide is above 97%.

The invention relates to a hydrolysis method of dioscin. A solid acid catalyst is added to the reaction solution containing the dioscin according to the proportion of 0.1g to 100g/100ml of extract and then the reaction solution is placed in water bath of 50 DEG C to 90 DEG C for reaction for 2h to 16h; after the hydrolysis, the reactant obtained is cooled to the room temperature and filtered in vacuum and the filter residue is dried at the temperature of 20 DEG C to 80 DEG C; the filter residue is extracted in organic solution for 4h to 12h continuously, the extract is separated and the organic solution thereof is recycled; finally the dioscin solid is obtained. The solid acid catalyst system adopted by the invention is a multiphase reaction; hydrogen ions are restrained on the surface of the catalyst rather than going into the body of the reaction solution, therefore, the acidification of the reaction solution is avoided and the loss of the hydrogen ions is rather small. The experimental result shows that the pH value of the solution phase after hydrolysis is 4 to 5 and the concentration of the hydrogen ions in the solution is 10,000 times lower than that of the solution which is hydrolyzed by hydrochloric acid, thus greatly reducing the pollution to the environment. The hydrolysis method has simple technology, moderate hydrolysis conditions and high hydrolysis conversion rate of the dioscin which is as high as 98 percent, thus fundamentally solving the problems of serious environmental pollution and equipment corrosion occurring in the inorganic acid catalysis hydrolysis process.

The invention discloses a preprocessing method capable of effectively improving the efficiency of generating fermentable sugars by bamboo cellulose enzyme hydrolysis. The preprocessing method comprises the following steps of: preparing materials; preprocessing acid catalyzed high-boiling alcohol; washing solid substrates obtained by preprocessing; milling the solid substrates by a millstone; and performing enzyme hydrolysis. By preprocessing the acid catalyzed high-boiling alcohol in the preprocessing method disclosed by the invention, hemicellulose and lignin can be synchronously and efficiently removed from bamboo fiber raw materials, and additionally, extractives and waxiness on the surfaces of the extractives can be effectively removed from the bamboo outer skin of the outer wall of bamboos. Compared with the existing acidic chemical preprocessing method, the recovery rate of fermentable glucose obtained by enzyme hydrolysis of cellulose in the bamboos after the high-boiling alcohol preprocessing is increased by 36 to 50%, and compared with the preprocessing method by using a low-boiling organic solvent, the recovery rate is increased by 10 to 15%. By using the preprocessing method in which a high-boiling alcohol/hydrosolvent system with acid catalysis and low alcohol content is utilized and the bamboos are preprocessed before enzyme hydrolysis within short time, the conversion efficiency of the cellulose in the bamboos to the fermentable sugars through enzyme hydrolysis can be improved, and the defect that the environmental pollution is caused by waste liquor can be overcome.

The invention discloses a method for producing high-purity sec-butyl alcohol through joint of a fixed bed and reaction rectification. Water and sec-butyl acetate are adopted as raw materials, preliminary catalytic hydrolysis is performed in a fixed bed reactor, further catalytic hydrolysis is performed in a reactive distillation column, a sec-butyl alcohol is generated, then, oil-water separationand three-step transformation rectification of decompression, pressurization and decompression are performed, and the high-purity sec-butyl alcohol is obtained. The reaction conditions are mild, the sec-butyl acetate hydrolysis conversion rate is high, and the byproduct acetic acid can be recycled for sec-butyl production.

The invention discloses a magnesium-based hydrogen desorption material, a preparation method thereof and a hydrolysis hydrogen production method. The hydrogen desorption material comprises magnesium hydride and a catalyst, wherein the catalyst comprises at least one of oxide, chloride and hydride; and the mass ratio of the magnesium hydride to the catalyst is as follows: 1-50 parts of the magnesium hydride and 1-30 parts of the catalyst. The hydrogen desorption material disclosed by the invention has the characteristics of sustainable hydrogen desorption, high hydrogen production capacity, high hydrolysis conversion rate and the like.

The invention relates to the technical field of kitchen waste treatment, in particular to a method for improving the capacity of a kitchen waste anaerobic treatment system and a hydrolysis tank. According to the kitchen waste treatment method capable of improving the capacity of the treatment system and the hydrolysis tank, kitchen waste slurry is fed from 1/2 or above height of the tank wall of the hydrolysis tank and is synchronously stirred, so that the kitchen waste slurry can be fully mixed with original kitchen waste slurry in the hydrolysis tank from top to bottom; the temperature of the kitchen waste slurry in the hydrolysis tank is kept at 35+/-3 DEG C by monitoring and interfering the environment in the hydrolysis tank, the average concentration of dissolved oxygen is kept at 0.5-1.0 mL/L, the pH value is kept at 3-5, the hydrolysis conversion rate can be remarkably increased, and therefore the treatment load of the treatment system is improved, by means of the method, the treatment load of the treatment system can be improved to be 4.5-6.5 kgVS/m<3>*d, the treatment residence time can be saved by about 40%, and the occupied space of an anaerobic tank can be saved by 25%or above; and the method has great application significance in increasing the treatment amount of the kitchen waste under the condition that an original kitchen waste treatment plant is not expanded.

The invention relates to a method for comprehensively utilizing a polysilicon by-product with low cost, which belongs to the technical field of polysilicon production. The technical problem to be solved by the invention is to effectively separate a hydrolysate of the polysilicon by-product to obtain precipitated silica and HCl and comprehensively utilize the polysilicon by-product with low cost. The technical scheme of the invention comprises the steps of: performing a hydrolysis reaction on the polysilicon by-product and water in a mol ratio of 1: 3-6; separating gas HCl and a small quantity of H2 from the hydrolysate in a decompression separation mode; and adding a flocculating agent into a liquid from which the gas is separated to form a precipitate, and roasting the precipitate obtained after solid-liquid separation to remove the flocculating agent to obtain the precipitated silica. The method has low reaction temperature, does not need heating and cooling, has high hydrolysis conversion rate and good separation effect, can make full use of Si and Cl in the by-product, has low requirement on equipment, has high utilization value of the hydrolysate, and can realize consumption reduction, energy conservation and comprehensive utilization of resources.

The invention discloses a method for preparing bambusa chungii liquid. The method comprises the following steps of pulping bambusa chungii, carrying out high-pressure treatment, carrying out enzymolysis, then, carrying out microfiltration, and sterilizing. According to the method, no food additive is added, and ultrahigh temperature is adopted to instantly sterilize bacteria, so that the nutrition and flavor of the bambusa chungii are preserved, and the bambusa chungii liquid is faint scent and slightly sweet; cane sugar is not artificially added, so that health problems resulting from the addition of white granulated sugar are avoided, and the bambusa chungii liquid is natural and healthy and meets the increasing demands of people on the safety, nutrition, flavor and taste of beverages.

The invention discloses a preparation method for red bamboo liquid. The preparation method comprises the following steps: beating, aqueous extraction, enzymolysis, microfiltration and sterilization. The preparation method is free of any kind of food additives and adopts a super high temperature instantaneous sterilization method, and the nutrition and flavor of the red bamboo are retained. The red bamboo liquid is pleasant and sweet in smell, is free of artificial sugar, and avoids the health problem caused by adding sugar. The red bamboo liquid has the characteristics of being natural and healthy and meets the higher and higher demand of people on safety, nutrition and flavor of beverage.

The invention belongs to the field of chemical production and chemical synthesis, and discloses a method for catalyzing hydrolysis and decarboxylation of grease by a cell-like multiphase emulsion photoenzyme system. The method comprises the following steps of: adding soluble salt, a polymer and/or hydrophilic alcohol, fatty acid light decarboxylase and grease into lipase liquid to prepare a cell-like multiphase emulsion system; or uniformly mixing the soluble salt, the polymer and/or the hydrophilic alcohol, the fatty acid light decarboxylase and the fatty acid to prepare the cell-like multiphase emulsion system; carrying out an enzyme catalysis reaction on the cell-like multiphase emulsion system under the condition of stirring and blue light irradiation; after the reaction is finished, adding ethyl acetate for carrying out extraction; standing or centrifuging until the product is divided into three layers; and collecting a supernatant product which is a hydrolyzed and decarboxylated product. The lipase can catalyze deep hydrolysis of glyceride, the fatty acid light decarboxylase can catalyze decarboxylation of free fatty acid, while rapid reaction and intelligent control are achieved, substrate inhibition can be relieved, and a novel multi-enzyme combined catalytic system which is efficient, controllable, easy in enzyme recovery and capable of synchronously separating products is established.

The invention discloses a resin catalysis method of preparing starch glucose which is characterized in that water is added in starch to prepare starch solution with the concentration of 10-40wt. percent; and then catalyst is added to change the solid-liquid ratio or the volume ratio of the catalyst and the starch solution to be 1 to 1-1 to 5; the mixture will react for 10-15h in an enclosed reactor at the temperature of 110-130 DEG C after being evenly stirred; the mixture is hydrolyzed to obtain the starch glucose. The invention can not only overcome the corrosion of the acid method on equipment and reduce the acid-base neutralization and the desalting process, but also overcome the problems of the acid method of high requirements for enzyme purity and activity, hard operating control, hart filtering and long production cycle. The method has the advantages of simple production procedures, less energy consumption and low production cost. The output starch glucose can be widely applied to industries and fields of food, medicine, chemical, papermaking, textile, etc.

The invention discloses a method for producing sec-butyl alcohol through continuous hydrolysis, and belongs to the field of chemical reactions and separation. The method takes the sec-butyl acetate asa main material, the sec-butyl acetate is subjected to catalytic hydrolysis in a reaction section of a reactive distillation column through a catalyst, and the high-purity sec-butyl alcohol is obtained through the oil water separation and the three-step pressure swing distillation comprising pressure reduction, pressurization and pressure reduction. The reaction rectification-pressure swing distillation coupling process is adopted to hydrolyze the sec-butyl acetate, the conversion rate of hydrolysis is high, the purity of the sec-butyl alcohol is high, and the operation condition of the reaction is mild.

The invention discloses a method for preparing bambusa chungii liquid. The method comprises the following steps of pulping bambusa chungii, carrying out water extraction, carrying out enzymolysis, then, carrying out ultrafiltration and sterilizing. According to the method, no food additive is added, and ultrahigh temperature is adopted to instantly sterilize bacteria, so that the nutrition and flavor of the bambusa chungii are preserved, and the bambusa chungii liquid is faint scent and slightly sweet; cane sugar is not artificially added, so that health problems resulting from the addition of white granulated sugar are avoided, and the bambusa chungii liquid is natural and healthy and meets the increasing demands of people on the safety, nutrition, flavor and taste of beverages.

The invention discloses a method capable of producing fermentable sugars from corncob residues by efficient enzymatic hydrolysis. The method comprises the following steps: (1) preparing raw materials;(2) performing pretreatment with a chemical method; (3) collecting reacted corncob residues, repeatedly washing the corncob residues multiple times until the corncob residues are neutral to obtain washed corncob residues; (4) performing enzymatic hydrolysis to obtain a hydrolysate for completion of production of the fermentable sugars from the corncob residues by efficient enzymatic hydrolysis. According to the method, the corncob residues are treated with a chemical pretreatment technique, hydrophilic performance of lignin in fiber raw materials is improved, the lignin is dissolved out easily, and accordingly, enzymatic hydrolysis yield of the corncob residues is increased; the corncob residues can be used in a higher-value manner with the method, investing cost for enzymatic hydrolysisis reduced, enzymatic hydrolysis efficiency is increased, raw material basis is provided for follow-up processing and utilization or production of products with high added value, so that application field and range of the corncob residues are expanded, and use quantity of wood fiber raw materials can be reduced effectively.

The invention relates to a method for preparing glucose from bamboo cellulose, belongs to the technical field of utiliztion of lignocellulose. Bamboo used as the raw material is subjected to hydrothermal treatment by a batch reactor, wherein the heating rate, maximum reaction temperature (250-240 DEG C) and cooling rate of the reaction are controlled to implement pretreatment on the bamboo cellulose; and the pretreated sample is subjected to enzyme hydrolysis to obtain the glucose. The method is simple and environment-friendly in the process and easy to control, and has favorable application prospects. After the bamboo cellulose is pretreated, the conversion rate of enzyme hydrolysis for generating glucose can be enhanced by 3.7 times, thereby implementing high-efficiency utilization of bamboo resources.