- 专利标题: Processes for improving acetic acid yield by removing iron
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申请号: US14941008申请日: 2015-11-13
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公开(公告)号: US09688600B2公开(公告)日: 2017-06-27
- 发明人: Yaw-Hwa Liu , Mark O. Scates
- 申请人: CELANESE INTERNATIONAL CORPORATION
- 申请人地址: US TX Irving
- 专利权人: CELANESE INTERNATIONAL CORPORATION
- 当前专利权人: CELANESE INTERNATIONAL CORPORATION
- 当前专利权人地址: US TX Irving
- 代理机构: Kilpatrick Townsend & Stockton LLP
- 主分类号: C07C51/12
- IPC分类号: C07C51/12 ; C07C51/47 ; C07C51/44 ; B01J31/40 ; C07C51/487
摘要:
In a process for improving a carbonylation process, iron is removed to maintain an effective Space Time Yield (STY) of the rhodium catalyst of at least 80% of the maximum STY. The process comprises carbonylating methanol in a reactor in a reaction medium comprising water, a rhodium catalyst, methyl iodide and a halide salt, separating a portion of the reaction medium in a flash vessel to form a less volatile stream and a vapor product stream comprising acetic acid, recycling a liquid stream to the reactor, wherein the liquid stream comprises a portion of the less volatile stream and wherein the liquid stream comprises iron, and removing a portion of the iron from the liquid stream to maintain an effective STY of the rhodium catalyst of at least 80% of the maximum STY.