发明名称 |
Purification of acetic acid and/or acetic anhydride using ozone |
摘要 |
<p>Acetic acid and/or acetic anhydride containing methyl crotonate, vinyl acetate, or both as impurities, is contacted with ozone in an amount of excess molar to the carbon-carbon double bond in said methyl crotonate and/or vinyl acetate and the impurities produced by ozone-treatment are removed off by distillation. A large quantity of impurities such as aldehydes are produced after treatment by treating acetic acid and/or acetic anhydride containing much amount of unsaturated compounds as impurities with ozone. Distilling the ozone-treated acetic acid and/or acetic anhydride make it possible to remove methyl crotonate and vinyl acetate, which are unsaturated compounds difficult to remove by the conventional separation methods, to give high-quality acetic acid and/or acetic anhydride excellent in the residence time in the potassium permanganate test.</p> |
申请公布号 |
EP0578193(B1) |
申请公布日期 |
1996.10.09 |
申请号 |
EP19930110769 |
申请日期 |
1993.07.06 |
申请人 |
DAICEL CHEMICAL INDUSTRIES, LTD. |
发明人 |
NIIJIMA, HIROYUKI;AKITA, KAZUYUKI |
分类号 |
C07C51/487;C07C51/573;C07C53/08;C07C53/12;(IPC1-7):C07C53/08 |
主分类号 |
C07C51/487 |
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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