METHOD OF REDUCING GAS EMISSIONS FROM POROUS PARTICLES Russian patent published in 2020 - IPC B01J33/00 B01J20/32 B05D5/00 B08B15/00 

FIELD: chemical or physical processes.

SUBSTANCE: object of the present invention is a method of reducing gas emissions from porous material in form of particles, containing inorganic porous base and in total content of at least 0.1 wt % of total weight of said particles of one or more compounds selected from organic compounds, halogenated compounds, boron-containing compounds and phosphorus-containing compounds. Particles are brought into motion in the flow of hot gas passing through them, and on the moving particles, the liquid composition containing one or more film-forming polymers is sprayed using a two-component spray nozzle, in which liquid composition is mixed with gas under pressure, at relative spraying pressure, which corresponds to pressure difference between gas pressure inside nozzle and atmospheric pressure greater than or equal to 0.7·10⁵ Pa to obtain protective layer on surface of said particles, containing said one or more film-forming polymers and having average thickness less than or equal to 20 mcm. Object of present invention is also material in form of porous particles for use as catalyst or adsorbent, coated with protective layer, which can be obtained using said method. Said film-forming polymer or polymers make from 0.1 to 4 wt % of total weight of particles and are selected from: homopolymers and copolymers of vinyl alcohol; polyethylene glycols; collagen; polyethylene terephthalates; polyethylene naphthalates; polyamides; polysaccharides; polyvinyl chlorides; polyvinylidene chloride; polyacrylonitriles; polyacrylate resins; copolymers, in which at least one of the monomers is an acrylate type monomer; and mixtures thereof.

EFFECT: technical result is reduction of potential release of gas from porous materials in form of particles containing organic compounds, halogenated compounds, boron-containing compounds and/or phosphorus-containing compounds.

19 cl, 2 tbl, 9 ex