公开(公告)号：EP1575908B2

公开(公告)日：2010-01-20

申请号：EP03785813.1

申请日：2003-12-13

申请人： BASF SE

发明人： SOHN, Martin ,  STROEFER, Eckhard ,  NEVEJANS, Filip ,  PENZEL, Ulrich ,  PALLASCH, Hans-Jürgen ,  VAN DEN ABEEL, Peter ,  DEBERDT, Filip ,  JACOBS, Jan D. ,  MACKENROTH, Wolfgang

IPC分类号： C07C263/20

CPC分类号： C07C263/10 ,  C07C263/20 ,  Y10S203/08 ,  C07C265/14

摘要： The invention relates to a method for producing isocyanates by reacting amines with phosgene in the presence of inert organic solvents inside a reactor and by subsequently processing the reaction mixture exiting the reactor. The invention is characterized in that the separating out of the solvent ensues in a two-step or multi-step, preferably two-step distillation process, and the solvent is separated out in a first apparatus under a pressure of 0.1 to 15 bar and in a second or other apparatuses under a pressure of 1 to 900 mbar. The condensation heat of the solvent vapor from the first apparatus is used for partially or completely vaporizing solvent in the second apparatus.

公开(公告)号：EP1575906B1

公开(公告)日：2010-11-17

申请号：EP03789264.3

申请日：2003-12-13

申请人： BASF SE

发明人： SOHN, Martin ,  STROEFER, Eckhard ,  NEVEJANS, Filip ,  PENZEL, Ulrich ,  PALLASCH, Hans-Jürgen ,  VAN DEN ABEEL, Peter ,  DEBERDT, Filip ,  JACOBS, Jan D. ,  MACKENROTH, Wolfgang

IPC分类号： C07C263/10 ,  B01D53/70 ,  C01B7/07

CPC分类号： C01B7/0731 ,  B01D53/002 ,  B01D2257/2045 ,  B01D2257/2064 ,  C01B7/0712 ,  C01B32/80 ,  C07C263/10 ,  Y02P20/154 ,  C07C265/14 ,  C07C265/12 ,  C07C265/10

摘要： The invention relates to a method for partially or completely separating a substance mixture consisting of hydrogen chloride and phosgene, optionally of solvents and optionally of low-boiling fractions and inert substances such as those that normally arise during the production of isocyanates by reacting amines with phosgene. The inventive method is characterized in that a partial or complete condensation of phosgene is firstly carried out followed by a distillation or stripping inside a column for removing the hydrogen chloride from the bottom product phosgene and lastly, a washing of the top product hydrogen chloride with the process solvent for absorbing the phosgene in the process solvent is carried out. A subsequent purification by means of adsorption on activated carbon or other appropriate methods can be used for removing solvent remnants.