公开(公告)号：AT520646T

公开(公告)日：2011-09-15

申请号：AT07726640

申请日：2007-03-06

Applicant: BASF SE

Inventor： PENZEL ULRICH ,  FRITZ RUEDIGER ,  ALLARDT HOLGER ,  ADAM JOHANNES ,  MERTEN ANNE-KATHRIN

IPC: C07C201/16 ,  B01D3/14 ,  C07C205/06

Abstract: A process is proposed for distillatively removing dinitrotoluene from process wastewater from the preparation of dinitrotoluene by nitrating toluene with nitrating acid, which comprises basifying the process wastewater to a pH of >8.5, feeding it to a stripping column in the upper region thereof and stripping it with steam in countercurrent to obtain a vapor stream laden with dinitrotoluene and a bottom stream depleted in dinitrotoluene compared to the process wastewater used.

公开(公告)号：AT473252T

公开(公告)日：2010-07-15

申请号：AT07730178

申请日：2007-06-15

Applicant: BASF SE

Inventor： OSTROWSKI THOMAS ,  ADAM JOHANNES ,  MECKELNBURG DIRK ,  MAHN ULRIKE ,  JOVANOVIC RENATA ,  LOEFFLER ACHIM

IPC: C08G65/00

Abstract: The invention relates to a process for the continuous preparation of polyether alcohols by reacting H-functional initiators with alkylene oxides using basic catalysts, wherein at least one initiator is metered with at least one alkylene oxide continuously into a back-mixing reactor and the reaction product is removed continuously from the back-mixing reactor.