公开(公告)号：US20220016576A1

公开(公告)日：2022-01-20

申请号：US17290698

申请日：2019-10-30

Applicant: BASF SE

Inventor： Jacek MALISZ ,  Johannes NAGEL ,  Michael JACQUIER

IPC: B01D61/58 ,  B01D61/02 ,  C07D251/24 ,  B01D71/02 ,  B01D61/14

Abstract: The present invention provides an improved process for isolating 2,4-bis-(2,4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazine (DIOPAT) from an aqueous alkaline mixture M having a pH of 10 or more and comprising the 2,4-bis-(2,4-dihydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4-dihydroxybenzophenone, and aluminum salts, wherein the process comprises a nanofiltration step, a precipitation step, and a further filtration step.