发明名称 |
PROCESS FOR THE PURIFICATION OF DIMETHYL TEREPHTHALATE |
摘要 |
In the process for the purification of diemthyl terephthalate (DMT) by recrystallization from methanolic solution, the mother liquor containing the impurities, substantially the isomers DMI, DMO and aldehydes, is separated off and passed to a workup tank. The moist crystals are dried by melting with the evaporation of methanol. The mother liquor is then separated off by filtration, and the moist crystals obtained from the separation are washed before melting. The washing liquid is recycled together with a portion of the separated mother liquor into the recrystallization tank.
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申请公布号 |
US5116518(A) |
申请公布日期 |
1992.05.26 |
申请号 |
US19900621644 |
申请日期 |
1990.12.03 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
BACHMANN, WILFRIED;BADER, ROLF;BUETTNER, HORST;WETZEL, EDGAR |
分类号 |
C07C67/52;C07C69/82 |
主分类号 |
C07C67/52 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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