Process for improving product quality and yield of propanediol and glycol

A product quality, ethylene glycol technology, applied in the production of bulk chemicals, separation/purification of hydroxyl compounds, preparation of organic carbonates, etc., can solve the problems of poor quality and low yield, and achieve improved quality and simple production process , the effect of low energy consumption
CN100513370CInactive Publication Date: 2009-07-15北京格瑞华阳科技发展有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
北京格瑞华阳科技发展有限公司
Publication Date
2009-07-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of preparing pyruvaldehyde by propylene glycol in low temperature liquid phase oxidation highly selectively is characterized in that below 50 to 55 DEG C and in the acidic solvent, taking chromium trioxide as the oxidant and highly selectively oxidizing 1, 2-propylene glycol to pyruvaldehyde. The conversion of the 1, 2-propylene glycol is 100 percent, and the selection of preparing pyruvaldehyde is from 95.6 percent to 99.6 percent.
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Description

1. Technical field

[0001] This patent belongs to the technical field of fine chemicals, and relates to the process of synthesizing dimethyl carbonate through transesterification reaction between propylene carbonate and ethylene carbonate and methanol respectively, and co-producing propylene glycol and ethylene glycol products. In particular, it can effectively improve propylene glycol, Ethylene glycol yield and quality process. 2. Background technology

[0002] Propylene glycol (R=CH 3 , see the following reaction formula) and ethylene glycol (R=H) are not only important organic solvents, but also important synthetic intermediates of compounds such as medicines, dyes, and macromolecules, and their market prospects are promising. They can be respectively prepared by the transesterification reaction of propylene carbonate and ethylene carbonate with methanol, and the reaction formula is as follows:

[0003]

[0004] In addition to propylene glycol and ethylene glycol, the...

Claims

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