Patent · US Active

Removal of Al-salts, HCl, NaCl and organic by-product from strong alkaline DIOPAT suspension by means of alkaline stable nanofiltration followed by separation of salts and byproducts after neutralization of DIOPAT solution by means of ultrafiltration

US11904279B2 · kind B2 · utility

1Cited by

1References

19Claims

0Family size

Assignee

BASF SE

Inventors

Jacek Malisz · Weil am Rhein, DE
Johannes Nagel · Ludwigshafen am Rhein, DE
Michael Jacquier · Binzen, DE

Key dates

Filing date	Oct 30, 2019
Grant date	Feb 20, 2024
Priority date	—
Expiry date	Oct 1, 2040

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D2315/16
WIPO fieldChemical engineering
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.