公开(公告)号：US11904279B2

公开(公告)日：2024-02-20

申请号：US17290698

申请日：2019-10-30

Applicant: BASF SE

Inventor： Jacek Malisz ,  Johannes Nagel ,  Michael Jacquier

IPC: B01D61/02 ,  B01D61/58 ,  B01D71/02 ,  C07D251/24 ,  B01D61/14 ,  B01D71/68

CPC classification number: B01D61/58 ,  B01D61/027 ,  B01D61/145 ,  B01D71/025 ,  C07D251/24 ,  B01D71/68 ,  B01D2311/08 ,  B01D2311/10 ,  B01D2311/14 ,  B01D2311/18 ,  B01D2311/2642 ,  B01D2311/2649

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.