Patent · US Active

Removal of Al-salts, HCl, NaCl and organic by-product from DIOPAT suspension by means of ceramic membranes in strong acidic conditions at high temperature

US12304891B2 · kind B2 · utility

0Cited by

1References

17Claims

0Family size

Assignee

BASF SE

Inventors

Jacek Malisz · Weil am Rhein, DE
Andreas Mueller · Zeitlarn, DE
Johannes Nagel · Ludwigshafen am Rhein, DE
Dominik LANZINGER · Ludwigshafen am Rhein, DE

Key dates

Filing date	Jul 18, 2019
Grant date	May 20, 2025
Priority date	—
Expiry date	Jul 13, 2042

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F1/66
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 comprising the DIOPAT, 2,4-dihydroxybenzophenone, and aluminum salts, wherein the process comprises the steps of precipitating the DIOPAT by acidifying the mixture M to a pH<1; heating the acidified mixture M to a temperature in the range of from 80° C. to 95° C.; and separating of the precipitated DIOPAT from the dissolved 2,4-dihydroxybenzophenone and the dissolved aluminum salts with a ceramic membrane by means of diafiltration.

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