发明授权
- 专利标题： Separation of m- and p-dichlorobenzene
- 专利标题（中）： 对 - 二苯并苯的分离
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申请号： US681891申请日： 1991-04-08
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公开(公告)号： US5152875A公开(公告)日： 1992-10-06
- 发明人: Siegbert Rittner , Adolf Schmidt , Rudolf Steiner , Leonhard Unverdorben
- 申请人： Siegbert Rittner , Adolf Schmidt , Rudolf Steiner , Leonhard Unverdorben
- 申请人地址： DEX Frankfurt am Main
- 专利权人： Hoechst Aktiengesellschaft
- 当前专利权人： Hoechst Aktiengesellschaft
- 当前专利权人地址： DEX Frankfurt am Main
- 优先权： DEX4011501 19900410
- 主分类号： C07C17/38
- IPC分类号： C07C17/38 ; C07C17/386 ; C07C25/08
摘要：
A process for separating m- and p-dichlorobenzene by extractive rectification with an extractant and removal of this extractant. Using as extractant an alkylene carbonate of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical to or different from one another and each is hydrogen, methyl or ethyl, with the proviso that together the radicals R.sup.1 to R.sup.4 do not contain more than 6 carbon atoms.The process of the invention makes it possible to separate off the m-isomer in high purity.
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