发明公开
EP3036217A1 VERFAHREN ZUR GEWINNUNG VON ORGANISCHEN ISOCYANATEN AUS DESTILLATIONSRÜCKSTÄNDEN DER ISOCYANATHERSTELLUNG
有权
PROCESS FOR从蒸馏残余物的异氰酸酯生产OBTAINING有机异氰酸酯
- 专利标题： VERFAHREN ZUR GEWINNUNG VON ORGANISCHEN ISOCYANATEN AUS DESTILLATIONSRÜCKSTÄNDEN DER ISOCYANATHERSTELLUNG
- 专利标题（英）： Process for obtaining organic isocyanates from distillation residues from isocyanate preparation
- 专利标题（中）： PROCESS FOR从蒸馏残余物的异氰酸酯生产OBTAINING有机异氰酸酯
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申请号： EP14750749.5申请日： 2014-08-14
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公开(公告)号： EP3036217A1公开(公告)日： 2016-06-29
- 发明人: TIDOW, Klaus , HECKING, Andreas , BUSCH, Jan , RICHTER, Frank , STEFFENS, Friedhelm
- 申请人： Covestro Deutschland AG
- 申请人地址： Kaiser-Wilhelm-Allee 60 51373 Leverkusen DE
- 专利权人： Covestro Deutschland AG
- 当前专利权人： Covestro Deutschland AG
- 当前专利权人地址： Kaiser-Wilhelm-Allee 60 51373 Leverkusen DE
- 代理机构： Levpat
- 优先权： EP13180927 20130819
- 国际公布： WO2015024859 20150226
- 主分类号： C07C263/20
- IPC分类号： C07C263/20 ; C07C265/14
摘要：
The present invention relates to a process for obtaining an organic isocyanate from a phosgenation product comprising the isocyanate, comprising the following steps: a) workup of the phosgenation product, the workup comprising at least one distillation step in which a first portion of the organic isocyanate is removed as distillate and a distillation residue comprising a second portion of the organic isocyanate is obtained, b) workup of the distillation residue obtained in a), the workup comprising at least one distillation step which is conducted at a temperature of up to 110°C at a pressure of not more than 1 mbar, wherein at least 50% by weight of the second portion of the organic isocyanate is removed from the distillation residue.
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