Reactor for preparing tetrabromoethane by addition reaction of bromine and acetylene and synthesis process

Abstract

The invention relates to a reactor for preparing tetrabromoethane by addition reaction of bromine and acetylene and a synthesis process; the reactor is characterized in that: the reactor is mainly composed of a central cooling pipe, a reaction pipe filled with fillers and an outer cooling pipe; continuous synthesis of the tetrabromoethane is realized by continuous countercurrent contact reaction of the bromine and the acetylene in the reaction pipe, so as to improve the production efficiency; by adjusting the temperature and flow rate of the cooling water in the inner and outer cooling pipes, the addition reaction temperature can be controlled, the problems of safety and more by-products are solved owning to overhigh reaction temperature; by adopting the reactor and the synthesis process, the explosive mixture of acetylene and air is prevented from being formed in the reaction process, so as to improve the reaction safety.

Description

Technical field [0001] The invention relates to tetrabromoethane, in particular to a reactor and synthesis process for preparing tetrabromoethane by addition reaction of bromine and acetylene gas. Background technique [0002] 1,1,2,2-Tetrabromoethane is a white or light yellow strongly refractive liquid with an odor of iodoform. It is miscible with ethanol, ether, chloroform, aniline and glacial acetic acid, but insoluble in water. The melting point is 0°C. The boiling point is 243.5°C, 151°C (7.2kPa), 114°C (0.267kPa). The relative density is 2.9656 (20 / 4°C), and the refractive index is 1.638. It can be decomposed when exposed to light and heat, and the color turns yellow. Above 190℃, the decomposition product is highly toxic carbonyl bromide vapor. Tetrabromoethane is an important chemical additive. It is used as a co-catalyst for the oxidation of xylene to terephthalic acid in the production process of polyester (PTA), a raw material for polyester. It is used in man-made...

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Problems solved by technology

[0008] In order to solve the problems existing in the synthesis process, especially that the synthesis reactor cannot be continuously produced, acetylene and air are easily formed to form an explosive mixture, and the exothermic heat of the reaction cannot be removed in time and may affect the reaction, etc., the present invention provides a bromine A reactor for the addition reaction of bromine and acetylene to prepare tetrabromoethane, the purpose of which is to realize the continuous addition reaction of bromine and acetylene gas, improve production efficiency and yield, and improve the utilization rate of raw material acetylene gas; The reaction is exothermic, avoiding safety problems caused by excessive temperature and excessive by-products; avoiding the formation of explosive mixtures of acetylene and air, improving reaction safety

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