| 摘要 |
The invention concerns a method for making carboxylic acids. More particularly, the invention concerns a method for making carboxylic acids by oxidizing hydrocarbon with oxygen or an oxygen-containing gas, and more particularly still it concerns oxidizing cyclohexane into adipic acid. The invention is characterized in that the method includes a step of oxidizing hydrocarbon and at least one step for extracting the dicarboxylic acids formed from the reaction medium and optionally recycling the unreacted hydrocarbon with oxidation by-products such as alcohols and ketones which may be formed. The inventive method further includes a step of transforming, eliminating or extracting E,i-hydroxycarboxylic compounds formed during the oxidizing step. Said step of transforming, eliminating or extracting E,i-hydroxycarboxylic compounds consists in subjecting the medium containing said compounds to oxidation to transform them into diacids. ® KIPO & WIPO 2008 |
