881-99-2Relevant articles and documents
Isophthalic chloride synthesis process (by machine translation)
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Paragraph 0017-0019; 0021; 0023; 0025-0027, (2019/07/04)
The invention relates to a kind of isophthalic chloride synthesis process, steps are as follows: (1) takes xylene, in the 100 - 105 °C to its access excessive COCl2 , By 4 - 10 hours reaction, to obtain the 1, 3 - di (trichloromethyl) benzene thick; (2) taking steps (1) to make the 1, 3 - di (trichloromethyl) benzene thick with the isophthalic acid, in N, N - dimethyl formamide under the catalytic action, 110 - 130 °C reaction 2 - 8 hours, until the non-hydrogen chloride gas is released, the resulting reaction solution obtained by rectification of the isophthalic chloride. The invention has high purity, high yield. The process is simple, raw materials are easy, convenient operation, low cost, easy to treat the exhaust gas, the product quality is high, and the quality is stable, not harmful to the environment and the like, and is suitable for industrial production. (by machine translation)
CLEAN PROCESS FOR PREPARING CHLOROFORMYL-SUBSTITUTED BENZENE
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Paragraph 0125; 0153; 0163, (2017/12/17)
Clean process for preparing a chloroformyl-substituted benzene by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process for preparing a polymer-grade chloroformyl-substituted benzene.
A second (trichloromethyl) benzene and two (chloroformyl) benzenetrisamide preparation method
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Paragraph 0079; 0080, (2017/02/24)
The present invention relates to a method for preparing bis(trichloromethyl)benzene through a photochemical reaction and preparing bis(chloroformyl)benzene through the further reaction of the bis(trichloromethyl)benzene. According to the present invention, di(methyl)benzene is added to a reactor, chlorine gas is introduced under the control of the illuminance of an incident light source and the reaction temperature, the obtained reaction mixture is subjected to a simple treatment so as to obtain the high purity bis(trichloromethyl)benzene; with the bis(trichloromethyl)benzene of the present invention, the high purity bis(chloroformyl)benzene, one of the aramid fiber production raw materials, can be conveniently obtained; and the preparation method of the present invention has the following advantages that the solvent, the free radical initiator, the photosensitizer and other third components can not be inproduced, and only the stage-control of the reaction condition and the wavelength and the intensity of the light source are required so as to improve the product purity.
B (trichloromethyl) benzene molecular distillation purification method
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Paragraph 0031; 0032; 0033, (2017/01/02)
The invention discloses a method for purifying bi(trichloromethyl)phenyl, in which a molecular distillation and purification technology is introduced. The method comprises the following steps of: firstly, pre-processing crude bi(trichloromethyl)phenyl, and eliminating light components in the bi(trichloromethyl)phenyl; carrying out primary molecular distillation of the pre-processed bi(trichloromethyl)phenyl, thus obtaining a distillate, namely high-purify bi(trichloromethyl)phenyl; and optionally, further carrying out secondary molecular distillation on the distilled residues obtained in primary molecular distillation. According to the invention, the problems of being easy to polymerize and coke in the purification process of the bi(trichloromethyl)phenyl are solved; and the method has the advantages of being high in yield and purity, energy-saving, environmentally friendly and the like.
METHOD FOR THE PREPARATION OF TRICHLOROMETHYL-GROUP-SUBSTITUTED BENZENE
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Paragraph 0129, (2016/06/28)
The present application relates to a method for photochlorination, and specifically to photochlorination by a photochemical reaction of an aromatic compound with gaseous chlorine so as to prepare a trichloromethyl-substituted benzene, and to a method using bis-(trichloromethyl)-benzene as the trichloromethyl-substituted benzene to prepare by further reaction bis-(chloroformyl)-benzene. Through the control of temperature, illuminance and consumption of gaseous chlorine, the method of this application can greatly improve the purity of trichloromethyl-substituted benzene and further prepare polymer-grade bis-(chloroformyl)-benzene with low cost. The present application also relates to a method for purifying trichloromethyl-substituted benzene, and specifically to a method for purifying trichloromethyl-substituted benzene via molecular distillation. The present application further relates to a photochlorination reactor for use in photochlorination reactions (such as those of the present application).
B (trichloromethyl) benzene continuous rectification method and apparatus
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Paragraph 0030-0034, (2017/05/16)
The invention relates to a process and a device for continuous rectification of bis(trichloromethyl)benzene. According to the method, bis(trichloromethyl)benzene crude product is preheated and enters the middle part of a first tower of a three-tower rectification system, the distillate part of the first tower enters the middle part of a second tower for rectification, the tower bottoms of the first tower and the second tower enter the middle part of a third tower for further rectification, the distillate part coming out from the tower top of the third tower is condensed to obtain bis(trichloromethyl)benzene. The process for producing bis(trichloromethyl)benzene provided by the invention has the advantages of high product purity, high yield, low cost, low energy consumption and the like.
Process for preparing substituted benzotrichloride compounds
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, (2008/06/13)
This invention pertains to a process for preparing substituted and unsubstituted benzotrichlorides. The process generally involves reacting the starting compound with a perchloroalkane with presence of base and a phase transfer catalyst.
Method for preparing trichloromethyl-trifluoromethyl-benzenes
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, (2008/06/13)
A process for the preparation of a trichloromethyl-trifluoromethyl-benzene of the formula STR1 wherein R1 and R2 are identical or different and represent hydrogen, fluorine or chlorine, By contacting at least one molecule of the formula STR2 wherein R1 and R2 are as previously identified, m and n are independently 0 to 3 With another molecule of the formula STR3 wherein M AND N ARE INDEPENDENTLY 0 TO 3 In the presence of a halogen transfer catalyst, optionally in the presence of a promoter.