Method for preparing lactic acid by using alkaline-earth metal modified Sn-beta catalyst

An alkaline earth metal and catalyst technology, applied in the field of lactic acid production, can solve the problems of limited sources of monosaccharide and polysaccharide reactants, low cellulose hydrolysis efficiency, small contact area, etc., and achieve short preparation cycle, high atom utilization rate, and process easy-to-use effects
CN110575844AInactive Publication Date: 2019-12-17XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
XIAMEN UNIV
Publication Date
2019-12-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preparing lactic acid by using an alkaline-earth metal modified Sn-beta catalyst. The method comprises the following steps: carrying out ion exchange reaction on an Sn-beta catalyst and an alkaline-earth metal solution to prepare the alkaline-earth metal modified catalyst; and mixing the catalyst, a saccharide substrate and a solvent, adding lactic acid, and carrying out lactic acid preparation reaction. In the catalytic reaction process, hydrolysis of levoglucosan and the polysaccharide substrate can be promoted by externally adding lactic acid, Sn is taken as an L acid active site in the reaction, alkaline earth metal ions and adjacent skeleton oxygen are taken as Lewis acid-base pair active sites, and generation of a trans-aldol reaction can be promoted through the synergistic effect of Sn, the alkaline earth metal ions and the adjacent skeleton oxygen, so that the selectivity of lactic acid is improved. Compared with other methods, the method provided by the invention has the advantages of simple catalyst preparation, short reaction time, good catalytic effect, easy industrialization and the like. The substrate used in the catalytic method is suitable for biomass thermal cracking product levoglucosan which can be obtained on a large scale, and has a good effect on high-molecular polysaccharides such as cellulose and inulin.
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Description

technical field

[0001] The invention relates to a method for preparing lactic acid, in particular to a method for using an alkaline earth metal modified Sn-β catalyst to prepare lactic acid. Background technique

[0002] The production of lactic acid traditionally uses the method of glucose fermentation (Datta, R.; Henry, M., Lactic acid: recent advances in products, processes and technologies-a review. Journal of Chemical Technology & Biotechnology [J]. 2006, 81 (7): 1119-1129), however, this biofermentation method suffers from many limitations, such as low production efficiency, high separation cost, large amount of waste liquid and complicated purification process. Therefore, it is necessary to develop new lactic acid production processes. Compared with the traditional biological fermentation method, the chemical catalytic method has more advantages, such as: higher concentration of lactic acid can be produced, easier separation method, higher production efficiency, lowe...

Claims

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