Basf Se Corporation

Dominik Lanzinger

Jacek Malisz

Johannes Nagel

Andreas Mueller

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.

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

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Ludwigshafen, Germany

Dominik Lanzinger