公开(公告)号：US20070249859A1

公开(公告)日：2007-10-25

申请号：US11409940

申请日：2006-04-24

申请人： Matthias Bohm ,  Wolfgang Lorenz ,  Bill Brady ,  Donald Pferdehirt

发明人： Matthias Bohm ,  Wolfgang Lorenz ,  Bill Brady ,  Donald Pferdehirt

IPC分类号： C07C263/10

CPC分类号： C07C263/10 ,  C01B7/0706 ,  C01B7/0731 ,  C07C263/20 ,  C07C265/14

摘要： Isocyanates are produced by a) reacting at least one amine with phosgene, optionally in the presence of a solvent to produce the corresponding isocyanate and a stream containing hydrogen chloride, phosgene and optionally solvent, low-boiling compounds and inert substances is obtained, b) separating the stream containing hydrogen chloride, phosgene and optionally solvent, low-boiling compounds and inert substances in an at least two-stage sequence of absorption steps that includes (1) at least one isothermal absorption step and (2) at least one adiabatic absorption step, to obtain (i) a hydrogen chloride stream containing phosgene in concentrations of at most 0.5 wt. % (based on the weight of the hydrogen chloride stream) and (ii) a liquid phosgene stream, and c) recycling the liquid phosgene stream (ii) to the reaction of amine with phosgene.

摘要翻译： 异氰酸酯通过以下方法制备：a）任选地在溶剂存在下使至少一种胺与光气反应以产生相应的异氰酸酯，并且获得含有氯化氢，光气和任选溶剂的低沸点化合物和惰性物质的流，b） 在至少两级的吸收步骤序列中分离含有氯化氢，光气和任选溶剂的低沸点化合物和惰性物质，其包括（1）至少一个等温吸收步骤和（2）至少一个绝热吸收 步骤，以获得（i）含有至多0.5重量％浓度的光气的氯化氢料流。 ％（基于氯化氢流的重量）和（ii）液体光气流，和c）将液体光气流（ii）再循环到胺与光气的反应中。