Inventor
KOLKMANN FRIEDRICH
DE6 patents
Patents
6 patentsUS4762693AAug 9, 1988
Process for working up heavy metal-containing residues originally from the decontamination of crude phosphoric acid
HOECHST AG10 citations72
US4906445AMar 6, 1990
Continuous process for complete removal or organic impurities from and complete decolorization of prepurified wet-process phosphoric acid
HOECHST AG2 citations61
US4889702ADec 26, 1989
Process for removing metallic constituents from dust obtained during the electrothermal production of yellow phosphorus
HOECHST AG4 citations58
US4904459AFeb 27, 1990
Process for working up dusts which are produced in the electrothermal production of phosphorus
HOECHST AG3 citations55
US4780294AOct 25, 1988
Process for making crude phosphoric acid
HOECHST AG1 citations49
US4683127AJul 28, 1987
Process for making wet-process phosphoric acid
HOECHST AG0 citations39