A Catalyst Catalyzing the Conversion of Complex Sugars to Produce Lactate

Abstract

The invention provides a catalyst for preparation of lactic acid ester by catalyzing conversion of complex sugars. The catalyst is composed of a tin-containing silicate molecular sieve as a main catalyst and WO3 as a co-catalyst. The catalyst can catalyze the conversion of sugars, especially hexose, into lactic acid ester in high yield. The catalyst can be easily separated and recovered, and can still obtain good results for a high-concentration sugar solution.

Description

technical field

[0001] The invention relates to the technical field of catalysts, in particular to a catalyst for catalyzing the efficient conversion of complex sugars such as sucrose, glucose, fructose and xylose to prepare lactate. Background technique

[0002] Lactic acid esters are widely used in food, cosmetics, chemicals and pharmaceutical industries. As a raw material for the preparation of biodegradable plastic polylactic acid, its demand is increasing year by year. At present, sucrose or glucose is mainly used as raw materials to obtain crude lactic acid through microbial fermentation, and the crude lactic acid is then subjected to esterification to obtain lactic acid ester. However, during the fermentation process, it is necessary to continuously add quicklime to maintain the pH value of the fermentation tank to maintain the activity of microorganisms. To obtain crude lactic acid, it is necessary to add a large amount of sulfuric acid for acidification, resulting i...