METHOD OF PREPARING FERRITE-ZINC CATALYST FOR TRANSESTERIFICATION REACTION Russian patent published in 2024 - IPC B01J37/03 B01J23/745 B01J23/80 

FIELD: catalytic chemistry.

SUBSTANCE: following is proposed: a method of producing a ferrite-zinc catalyst by the method of mutual chemical precipitation for the transesterification reaction between triglycerides of carboxylic acids and alcohol in the production of biodiesel fuel, in which pre-calculated amounts of salts: zinc chloride and iron nitrate nine-hydrate or zinc oxide dissolved in 65% nitric acid, and Ferric chloride hexahydrate , containing Zn²⁺ and Fe³⁺ ions, in a ratio of 1 to 2, is transferred into solution and a chemical reaction of mutual precipitation of metal ions in the form of hydroxides is initiated by adding sodium alkali while stirring at a speed of 300–400 rpm at room temperature and bringing the solution to a pH of 11, then the resulting suspension is separated by centrifugation at least four times at a speed of 8,500–9,000 rpm for at least 3 minutes, the resulting precipitate is washed with distilled water to a pH of 7 and evaporated at constant stirring, temperature 100°C for 2–3 hours.

EFFECT: production of a catalyst for the transesterification reaction of zinc ferrite with a spinel structure ZnFe₂O₄ in various crystalline states, synthesized from commercially available zinc salts Zn²⁺ and Fe³⁺.

2 cl, 7 dwg, 2 ex