SPATIALLY HINDERED HYDROQUINONES AS AGENTS PREVENTING CLOGGING BY DEPOSITS WITH RESPECT TO UNSATURATED MONOMERS Russian patent published in 2021 - IPC C09K15/04 C08F2/42 C07C7/20 

FIELD: polymerization.

SUBSTANCE: invention relates to a method for preventing clogging by deposits caused by radical polymerization of unsaturated compounds, in particular vinyl monomers. More specifically, it refers to the use of hindered hydroquinones to inhibit polymerization, which leads to clogging of process equipment with deposits. A method for inhibiting polymerization during processing, transportation, or storage of a hydrocarbon stream containing a hydrocarbon with an unsaturated carbon-carbon bond is described, including bringing the hydrocarbon product into contact with an effective amount of the hydroquinone compound of Formula (2) or Formula (3):

wherein Х₁, Х₂ and Х₃ independently represent -О- or -C(H)(R₄)-, and wherein at least one of X₁, Х₂ and Х₃ represents -C(H)(R₄)-, Z₁, Z₂, Z₃ and Z₄ independently represent -О- or -C(H)(R₄)-, and wherein at least two of Z₁, Z₂, Z₃ and Z₄ represent -C(H)(R₄), R₃ are alkyl, aryl, or heterocyclo, R₄ independently represents hydrogen, alkyl, aryl, or heterocyclo, and wherein the hydroquinone compound inhibits the polymerization of a hydrocarbon with an unsaturated carbon-carbon bond and a hydrocarbon with an unsaturated carbon-carbon bond including ethylene, propylene, acetylene, styrene, butadiene, or a combination thereof. To increase the effectiveness of polymerization inhibition, hydroquinone compounds can be used in combination with nitroxyl compounds.

EFFECT: technical result is prevention of undesirable polymerization of unsaturated compounds, prevention of clogging with deposits on technological equipment in the form of a contaminant caused by this undesirable polymerization for a variety of technological processes involving hydrocarbons in which vinyl substances are present.

11 cl, 1 tbl, 4 ex, 1 dwg