公开(公告)号：DE4011501A1

公开(公告)日：1991-10-17

申请号：DE4011501

申请日：1990-04-10

Applicant: HOECHST AG

Inventor： RITTNER SIEGBERT DR ,  SCHMIDT ADOLF DR ,  STEINER RUDOLF PROF DR ,  UNVERDORBEN LEONHARD DIPL ING

IPC: C07C17/38 ,  C07C17/386 ,  C07C25/08

Abstract: The invention relates to a process for the separation of m- and p-dichlorobenzene by extractive rectification using an extractant and removal of this extractant, in which the extractants used are alkylene carbonates of the general formula … … in which R , R , R and R are identical to or different from one another and represent hydrogen, a methyl or an ethyl radical, with the proviso that the radicals R to R together do not contain more than 6 C atoms. … The process according to the invention makes it possible to separate off the m isomer in high purity.