Bulletin Officiel de la Propriété Industrielle (BOPI) des Brevets d'Invention

BOPI 06 BR/2023 REPERTOIRE NUMERIQUE 13 (74) Cabinet Spoor & Fisher Inc. Ngwafor & Partners, The House of Gideon, Golf/Bastos Quarter, Opposite The American Embassy, Entrance-Saint John Paul, II Boulevard, P.O. Box 8211, YAOUNDE (CM). (57) The aim of the invention is to develop a novel method for producing sulphur from phosphogypsum. During this process, the phosphogypsum is mixed with a source of carbon and hydrogen forming a slurry after mixing. This source of carbon and hydrogen is a natural or synthetic organic polymer, for example but not limited to biomass, worn tyres or plastic, kerogen or tars. The granules undergo a heat treatment (100 to 150°C) to evaporate the mixing water. The obtained product undergoes a heat treatment (550 to 900°C) in a neutral and/or partially oxidising atmosphere. The generated gases are bubbled through demineralised water, a sodium hypochlorite solution or a basic aqueous solution, which allows the trapping of, inter alia, organosulphur molecules, and the precipitation of sulphur S8. The gases not trapped by the water are recovered in order to extract the volatile sulphur products. Fig. 1 Consulter le mémoire ________________________________________ (11) 20985 (51) A01N 25/30 (2018.01); A01N 59/02 (2018.01); A01P 3/00 (2018.01) ; A01P 7/04 (2018.01) (21) 1202100364 - PCT/EP2020/053122 (22) 07/02/2020