发明名称 |
PROCESS FOR THE SEPARATION OF HIGH-BOILING MATERIALS FROM THE REACTION MIXTURE GENERATED DURING THE PRODUCTION OF DIAMINOTOLUENE |
摘要 |
Amine mixtures generated during the production of diaminotoluene by hydrogenating dinitrated aromatic compounds are treated to separate high boiling materials from the desired amine products. In this process, any water of reaction and any solvent are first removed from the diaminotoluene isomer mixture (TDA mixture). The low-boiling TDA isomers are then separated using a TDA isomer distillation column. In the process of the present invention, the bottom phase remaining after the initial distillation contains a mixture of m-TDA and high-boiling materials. This bottom phase is separated and concentrated until the high-boiling material content is from approximately 25 to 60 wt.%. This concentrated bottom phase is then mixed with o-TDA in a ratio of 1:1 to 1:5 and a m-/o-TDA mixture is removed by distillation. The m-/o-TDA mixture thus recovered is then returned to the TDA isomer distillation column.
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申请公布号 |
CA2198815(A1) |
申请公布日期 |
1997.09.05 |
申请号 |
CA19972198815 |
申请日期 |
1997.02.28 |
申请人 |
BAYER AKTIENGESELLSCHAFT |
发明人 |
WITT, HARRO;GREGER, GERD;ZARNACK, UWE-JENS;BECKHAUS, HEIKO |
分类号 |
B01D3/14;C07C209/84;C07C209/86;C07C211/50;(IPC1-7):C07C211/50 |
主分类号 |
B01D3/14 |
代理机构 |
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主权项 |
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地址 |
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