METHOD FOR PRODUCTION OF POWDER OF 1,4-BIS(4-PHENOXYBENZOYL)BENZENE AND POLYESTERKETONKETONE BASED ON IT Russian patent published in 2022 - IPC C08G67/00 C07C45/81 C07C49/784 C07C45/46 C07C45/79 C07C49/84 

FIELD: chemistry.

SUBSTANCE: invention relates to the field of production of thermostable polymers, in particular to a method for the production of powder of 1,4-bis(4-phenoxybenzoyl)benzene (hereinafter – 1,4-EKKE), including mixing of terephthalic acid dichloranhydride (TPC) and diphenyl ester (DPE) in a nitrobenzene medium to obtain a reaction solution; addition to the reaction solution of Lewis acid as a catalyst, wherein the specified catalyst is added at a temperature from 6 to 15°C, to obtain a reaction mixture; bringing a temperature of the reaction mixture to a reaction temperature from 6 to 40°C; exposure of the reaction mixture at the reaction temperature to obtain a product mixture containing 1,4-EKKE; isolation of raw powder of 1,4-EKKE by deactivation of the reaction mixture containing 1,4-EKKE with subsequent filtration; drying of the resulting raw powder of 1,4-EKKE until reaching a nitrobenzene content in the resulting powder of 1,4-EKKE of less than 2.5 wt.%, while the purity of nitrobenzene should be such that a value of a refraction indicator, measured in accordance with GOST 18995.2-73, is provided from 1.5540 to 1.5640 at 20°C. The invention also relates to the production of polyesterketonketone (hereinafter – PEKK), a value of characteristic viscosity of a solution of which in concentrated H₂SO₄ is 1.02±0/05 dl/g, and which is characterized by the minimal number of structural defects of a macromolecular chain, leading over time to increase in viscosity of a melt of recycled polymer. The invention discloses a method for the production of PEKK through the production of 1,4-bis(4-phenoxybenzoyl)benzene (1,4-EKKE) as an intermediate compound in the form of powder, as well as a method for the production of powder of the specified intermediate compound of 1,4-EKKE.

EFFECT: powder of 1,4-EKKE is characterized by a granulometric composition including at least 80 wt.% of particles, sizes of which are from 10 to 40 mcm, and the total content of fractions with a particle size up to 10 mcm and above 40 mcm, not exceeding 20 wt.%.

33 cl, 1 dwg, 13 tbl, 13 ex