| 摘要 |
<p>Water is removed from an aqueous carboxylic acid stream containing stream by the use of a polyanhydride. The aqueous carboxylic acid contains 50% by weight, preferably 80% and in particular 95% by weight of carboxylic acid. The process is particular applicable to an acid stream containing acrylic acid to product acrylic acid of high purity. The polyanhydride can be a copolymer of maleic anhydride and diisobutylene cross-linked with divinylbenzene. The polyanhydride can be regenerated for use.</p> |
