| 摘要 |
The present invention consists of a process for the preparation of carboxylic acid by hydrolysis, in the liquid phase, of a C1-C4 alkyl aliphatic dicarboxylate, characterised in that a mixture of the said alkyl dicarboxylate and of water is subjected to a reactive distillation, by introduction of the said mixture into the middle part of a column containing a gel-type resin, containing sulphonic acid groups, maintained in place using a support and having the following characteristics: … … - a skeleton based on styrene and divinylbenzene, the divinylbenzene content by weight with respect to the total weight of the said skeleton being between 1% and 12%, … - an exchange capacity of 3 to 6.5 milliequivalents of H<+>/gram of dry resin, … and by continuous distillation of the alkanol formed by the hydrolysis reaction. |
