SUSPENSION METHOD FOR PRODUCTION OF SYNTHETIC ETHYLENE-PROPYLENE RUBBER Russian patent published in 2022 - IPC C08F2/18 C08F4/642 C08F4/68 C08F6/24 C08F210/16 C08F210/18 

FIELD: petrochemistry.

SUBSTANCE: invention relates to petrochemistry, specifically to a suspension method for the production of synthetic double ethylene-propylene rubbers (SEPR) and triple ethylene-propylene-diene rubbers (SEPDR). A suspension method for the production of synthetic ethylene-propylene rubber is described, providing for copolymerization of ethylene and propylene in a liquid propylene medium in the presence of non-conjugated diene or without it, with separate supply directly to a reaction zone of a reactor of catalytic system components based on a post-metallocene compound of vanadium, an organoaluminium activator – diethyl aluminum chloride, and an organochlorine reactivator, a reaction mixture, and a molecular weight regulator to obtain a rubber suspension in liquid propylene, removal of residues of the catalytic system from the resulting rubber suspension at a degassing stage, isolation, and drying of rubber. As the molecular weight regulator, hydrogen is used, residues of the catalytic system are removed from the resulting rubber suspension in liquid propylene at a stage of two-stage degassing, wherein, at the second degassing stage, a three-section degasser is used, at pressure in a I stage degasser of 0.03-0.07 MPa and temperature of 75-85°C, at pressure in a II stage degasser of 0.3-0.4 MPa and temperature of 130-140°C, to form at each stage a rubber suspension in water, with concentration of 4-5 wt.% and particle diameter of 5-15 mm, which is supplied to rubber homogenization, isolation, and drying, while the catalytic system, as the post-metallocene compound of vanadium, contains a precatalyst of {2,4-di-tert-butyl-6-[(tert-butylimino(methyl]phenolate}oxodichloride of vanadium (V) in toluene, as the organochlorine reactivator – ethyltrichloracetate in absolutized dichloromethane.

EFFECT: increase in activity of a catalytic system, efficiency, and environmental friendliness of a process due to reduction in residual vanadium content in final rubber.

2 cl, 1 dwg, 6 ex