公开(公告)号：US20210053890A1

公开(公告)日：2021-02-25

申请号：US16958383

申请日：2019-01-08

Applicant: ExxonMobil Chemical Patents Inc.

Inventor： Constantinos P. Bokis ,  Javier Gazman ,  Monica D. Lotz ,  Michael P. Lanci ,  Catherine M. Dorsi ,  Scott J. WEigel

IPC: C07C7/00 ,  C07C5/367 ,  C07C5/27 ,  C07C2/66 ,  C07C5/10 ,  C07C2/74 ,  C07C15/14 ,  C07C7/04 ,  C07C7/14 ,  B01D3/10

Abstract: Processes are described for separating 3,4′- and 4,4′-dimethylbiphenyl from a mixture comprising at least 3,3′-, 3,4′- and 4,4′-dimethylbiphenyl. In the processes, the mixture is cooled to produce a crystallization product comprising at least of the 4,4′-dimethylbiphenyl from the feed mixture and a first mother liquor product. The first mother liquor product is distilled to produce a bottoms stream enriched in 4,4′-dimethylbiphenyl as compared with the first mother liquor product and an overhead stream deficient in 4,4′-dimethylbiphenyl as compared with the first mother liquor product. The overhead stream is then cooled to produce a second crystallization product comprising at least part of the 3,4′-dimethylbiphenyl from the overhead stream and a second mother liquor product.