Process for producing acetic acid
AssigneeDaicel Corporation
InventorsMasahiko SHIMIZU, Yoshihisa MIZUTANI, Hiroyuki MIURA
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Abstract
A process for separating or removing permanganate reducing compounds (PRC's) from a first mixture containing at least one PRC, methyl iodide, and water comprises the steps of: feeding the first mixture to a feed port of a distillation column, and distilling and separating the first mixture into an upper stream and a lower stream, wherein the distillation of the first mixture forms a second mixture at an upper position than the feed port, and the process further comprises the steps of: withdrawing the second mixture as the upper stream, and withdrawing the lower stream from a lower position than the feed port.
Claims17
A process for separating or removing permanganate reducing compounds (PRC's) from a first mixture containing at least one PRC, methyl iodide, and water, the process comprising the steps of:
- feeding the first mixture to a feed port of a distillation column, and
- distilling and separating the first mixture into an upper stream and a lower stream, the upper stream being at least one stream selected from the group consisting of an overhead stream and a side-cut stream,
- wherein the distillation of the first mixture allows at least a portion of water in the first mixture to rise to an upper position than the feed port to form a second mixture containing the portion of water, and the process further comprises the steps of:
- withdrawing the second mixture as the upper stream, and withdrawing the lower stream from a lower position than the feed port, a water content of the lower stream being lower than that of the first mixture.
A process for producing acetic acid, comprising the steps of:
- distilling a mixture containing at least one PRC, methyl iodide, water, methyl acetate, and acetic acid to separate the mixture into a first overhead and an acetic acid stream, the first overhead containing at least one PRC, methyl iodide, and water, and the acetic acid stream containing product acetic acid;
- distilling at least a portion of the first overhead as a first mixture in a distillation column;
- withdrawing an upper stream, the upper stream being at least one selected from the group consisting of a second overhead stream and a side-cut stream;
- biphasically separating the withdrawn upper stream into an aqueous phase and an organic phase;
- withdrawing the aqueous phase;
- and
- withdrawing a lower stream from a lower position than the feed port, wherein the lower stream has a content rate and an amount of water lower than those of water in the first overhead.
Dependencies are inferred from the claim text.