37 results about "LACTIC ACID LIQUID" patented technology

The invention belongs to the field of synthesis of biodegradable materials, and particularly relates to a method for synthesizing lactide by catalyzing a lactic acid liquid phase one-step method. Specifically, lactide with high yield and high optical purity is obtained through one-step synthesis by catalyzing a raw material lactic acid with a modified catalyst. Aiming at the acidity range required for synthesizing lactide from lactic acid by a one-step method, the regulation and control of the acidity proportion in the H beta molecular sieve are realized in situ by innovatively utilizing a high-temperature water vapor treatment method, and compared with a post-treatment method for regulating and controlling the acidity proportion of the molecular sieve, the high-temperature water vapor treatment method is low in price and free of environmental pollution. The catalyst can improve the optical purity and selectivity of the lactide and reduce the purification difficulty of the lactide in the process of catalyzing the lactic acid liquid phase one-step method to synthesize the lactide, the liquid phase one-step method is operated at normal pressure / near normal pressure, the production condition is mild, the catalyst is easy to separate and recover, the production cost can be effectively reduced, and the method is suitable for industrial production. And the method has a relatively great industrial application prospect.