Method for preparing lactic acid through selective catalytic conversion of ethylene glycol

A catalytic conversion and ethylene glycol technology, applied in chemical instruments and methods, preparation of organic compounds, carboxylate preparation, etc., can solve the problems of large-scale production limitations, dilute product concentration, and easy poisoning fermentation cycle, etc., to achieve reaction High conversion efficiency and easy operation
CN110357770AActive Publication Date: 2019-10-22FUDAN UNIV
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
FUDAN UNIV
Publication Date
2019-10-22

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Abstract

The invention specifically relates to a method for preparing lactic acid through selective catalytic conversion of ethylene glycol, belonging to the technical field of fine chemical engineering. The invention provides an azacyclocarbene metal complex catalyst for the selective catalytic conversion of ethylene glycol to produce lactic acid at first. According to the method of the invention, ethylene glycol and methanol are used as raw materials, an alkali metal or alkaline earth metal hydroxide is used as a base, an azacyclocarbene metal complex is used as a catalyst, and a closed reaction is carried out at 100-200 DEG C for 0.5-12 h to prepare lactic acid. Compared with the prior art, the method of the invention has the following advantages: the cheap and easily-available ethylene glycol and methanol are used as substrates; a catalytic oxidation reaction is performed under mild conditions; quantitative lactic acid yield is obtained; reaction conversion efficiency is high; operation iseasy; high-purity lactic acid can be obtained without complicated post-treatment; and the method is suitable for large-scale industrial application.
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Description

technical field

[0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a method for preparing lactic acid. Background technique

[0002] As a common metabolite of organisms, lactic acid is widely distributed in nature. It is recognized as one of the three major organic acids and the smallest chiral molecule in nature. It is a class of industrial products with high added value. At present, the annual production capacity of lactic acid in the world is about 370,000 tons, and the annual production capacity growth rate is about 12%, while the total demand for lactic acid is about 500,000 tons per year, and the annual growth rate is about 16%. Especially in recent years, as a biodegradable bio-based polymer material, polylactic acid has been recognized as an ideal plastic material due to its excellent thermoplasticity and safety. Therefore, the contradiction between supply and demand of lactic acid will become increasingly serious. ...

Claims

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