METHOD FOR OBTAINING TRICHLOROMETHYL-SUBSTITUTED BENZENE Russian patent published in 2018 - IPC C07C17/14 C07C17/10 C07C17/38 C07C51/60 B01J19/12 C07C22/04 C07C53/44 

FIELD: chemistry.

SUBSTANCE: invention relates to a photochlorination process and especially to photochlorination by photochemical reaction of an aromatic compound of formula (X)_aC₆H_6-a-b(CH₃)_b, where X is an atom of chlorine, bromine or fluorine, ʺaʺ is an integer selected from 0, 1, 2, 3, 4 and 5, ʺbʺ is an integer selected from 1, 2, 3 and 4, and a + b≤6, or its alkyl chloride, in which the hydrogen atoms of the alkyl groups in the side chains of the aromatic compound are not completely replaced by chlorine atoms, as a starting material with gaseous chlorine under light conditions to obtain trichloromethyl-substituted benzene. Moreover, lighting has a light source wavelength in the range between approximately 350 nm and 700 nm and a wave amplitude within no more than 50 nm, and where the supply of chlorine is initiated under the conditions of the initial reaction temperature in the range between approximately 0°C and approximately 85°C and start lighting between approximately 2,000 lux and approximately 55,000 lux at the first reaction step, at which the reaction temperature is adjusted to a temperature of no higher than about 120°C under lighting. Then, after the first reaction step, the remaining amount of chlorine from the total amount of chlorine required in the reaction, is supplied in the reaction until its end at a higher reaction temperature and a higher light intensity than the temperature and lighting used at the first reaction stage. Reaction temperature is not higher than about 350°C, and the lighting is not more than about 100,000 lux. Invention also relates to a process of purifying trichloromethyl-substituted benzene, especially by molecular distillation, to a process of producing bis (chloroformyl) benzene and to a reactor for photochlorination.

EFFECT: technical result is high purity of trichloromethyl-substituted benzene, cost reduction, increased intensity and range of lighting and a more even distribution of lighting.

37 cl, 9 dwg, 45 ex