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

The invention discloses a technique for preparing oxalic acid by performing continuous reaction rectification hydrolysis on dimethyl oxalate. The raw material dimethyl oxalate is subjected to autocatalytic hydrolysis in a continuous reaction rectification dividing wall column to prepare the oxalic acid. The technique has the characteristics of high reaction speed, high reaction conversion rate, simple equipment, low energy consumption and no environmental pollution in the preparation process, and the hydrolysis conversion rate of the dimethyl oxalate is up to 99% above. The technique completely solves the problem that the dimethyl oxalate solid can not be subjected to continuous reaction rectification and can easily block the column.

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 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 discloses a dry desulfurization and purification process for ethylene-rich gas. Ethylene-rich gas can be desulfurized by hydrolysis, fine deoxidation, dehydration and mercaptan removal, arsenic removal, mercury removal and other processes in sequence, and the COS in the raw material can be removed to less than 0.1ppm, O 2 Content less than 1ppm, H 2 O content is reduced to not more than 10ppm, As content is not more than 5ppb, Hg content is not more than 5ppb, NO X It is reduced to less than 10ppb, which meets the needs of subsequent ethylene cold box separation, and the pressure drop of the entire process bed is not greater than 50KPa. The process has the characteristics of simple process, less ethylene loss, high purification precision and low operating cost.

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 relates to a hydrolysis method of dioscin. A solid acid catalyst is added into 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 invacuum 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 preparation method of red bamboo liquid, which comprises the following steps: beating red bamboo, water extraction, enzymatic hydrolysis, and then ultrafiltration to sterilize. The invention does not add any food additives, adopts ultra-high temperature instantaneous sterilization, retains the nutrition and flavor of red bamboo, has a slightly sweet fragrance, does not artificially add sucrose, avoids health problems caused by the addition of white sugar, is natural and healthy, and satisfies people's desire for beverages There is an increasing demand for safety, nutrition and flavor.