Preparation method of hydroxyacetic acid
A technology of glycolic acid and methyl glycolate, applied in the field of preparation of glycolic acid, can solve the problems of high manufacturing cost, complicated operation and high working hours, and achieve the effects of reducing production cost, shortening reaction time and improving competitiveness.
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Embodiment 1
[0031] Add 40 milliliters of water and 100 grams of concentrated sulfuric acid with a mass concentration of 98% into a 1000 milliliter flask to form a 70% sulfuric acid solution, add 114 grams of hydroxyacetonitrile aqueous solution with a mass concentration of 50% under heating and stirring, keep the temperature at 130 ° C, and hydrolyze 4 hours, and steamed 50 milliliters of water, then added 60 g of mass concentration of 85% aqueous methanol, reacted at 110 ° C, after 30 minutes at this temperature, continuously added 200 grams of methanol aqueous solution of 85% within 3 hours, While continuously adding methanol aqueous solution, the mixture of methanol, water and methyl glycolate was continuously distilled off, and the residue was the acid salt of ammonium sulfate.
[0032] Collect the evaporated mixture, add 150 ml of deionized water to the ester hydrolysis kettle, carry out ester hydrolysis at 100°C under stirring, distill methanol, and then distill part of the water...
Embodiment 3
[0037] Add 80 milliliters of pure water and 210 grams of concentrated sulfuric acid with a mass concentration of 98% in the reaction kettle, add 228 grams of hydroxyacetonitrile aqueous solution with a mass concentration of 50% under stirring, and carry out a hydrolysis reaction at 120 ° C for 5 hours, while steaming about 100 grams of water. Then, 135 grams of aqueous methanol solutions with a mass concentration of 85% were dropped into the reactor, heated to 110° C., and after esterification for 2 hours, 400 grams of aqueous methanol solutions with a mass concentration of 85% were continuously added at this temperature within 5 hours. While adding methanol aqueous solution, the mixture of methanol, water and methyl glycolate was distilled off continuously, and the residue was the acid salt of ammonium sulfate.
[0038] Put the distilled mixture in an ester hydrolysis bottle, add 200 ml of water distilled during the acid hydrolysis of hydroxyacetonitrile aqueous solution,...
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