DEHYDROXYLATION OF POLYHYDROXY CARBOXYLIC ACIDS TO ALIPHATIC POLYCARBOXYLIC ACIDS USING A HALOGEN-BASED CATALYST

摘要

Polyhydroxy carboxylic acids are converted to aliphatic polycarboxylic acids, such as adipic acid, under reductive or non-reductive dehydroxylation conditions, in the presence of a halogen-based catalyst. The relatively mild process conditions include a gas pressure from 1 psig (~6.89 KPa) to 2000 psig (~13.79 MPa), a temperature from 50 °C to 250 °C, a liquid reaction medium, and a molar ratio of the polyhydroxy carboxylic acid, such as glucaric acid, to the halogen atoms from 1:10 to 100:1.