| abstract |
The invention relates to a process for the preparation of terephthalic acid dimethylester of p-xylene and methanol to which the filter from the recrystallization of the crude DMT fraction evaporates or the methanol-containing fraction and possibly other methanol-containing streams are rectified at a pressure under the pressure applied to the esterification 2 to 20, preferably 4 to 8, the vapors containing methanol thus obtained are subjected to a compression using a compression ratio of 1.2: 1 to 15: 1, preferably 3: 1 ... 9: 1, the final temperature reached by compression is 150 ... 300 ° C, preferably 220 ... 280 ° C, after which these compressed vapors are used to esterify the oxidant. |