Process for synthesis of partially substituted bromomethane with photochemical reaction

Abstract

The invention discloses a technique of synthesizing low-substituted methyl bromide with photochemical reaction. The technique is provided with a photoreaction area and a circular condensing area. A reactor in the photoreaction area is vacuum before the reaction and can be illuminated by light and heated. The circular condensing area can be communicated with or is disconnected with the reactor, which is provided with a hydrogen bromide absorption tube and refrigerating circulation liquid. The circular condensing area is also connected with a product storage tank. When the reactor is vacuum, the reactor is filled with liquid bromine and methane. Light source is opened and the photoreaction begins. When the brownish red color of the liquid bromine in the reactor disappears, the reactor is heated at once to vaporize the reaction product completely. At the moment, the circular condensing area is communicated to exchange gas circularly for the product. The low-substituted methyl bromide is obtained in the product storage tank. The invention takes visible light as the light source. The chemical reaction principle is simple. The invention is applicable to commercial process.

Description

technical field [0001] The invention relates to the technical field of organic photochemical synthesis, in particular to a process for synthesizing low-substituted methyl bromide by photochemical reaction. Background technique [0002] Methane is the main component of coalbed methane and natural gas. With the increasing depletion of oil resources, abundant natural gas resources will become one of the most promising alternative energy sources and chemical raw materials in the future. [0003] The direct conversion of stable methane into high value-added chemicals has always been the dream of the scientific community at home and abroad, and it is also one of the most challenging topics in the field of heterogeneous catalysis. [0004] At present, there are different ways and methods to study methane (activation) conversion at home and abroad. From the current research situation, although some valuable results have been obtained, there is still a big gap with the goal of indus...

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Problems solved by technology

[0014] The industrial production process of methyl bromide and methylene bromide mentioned above is due to the high cost of raw materials used, poor product selectivity, and a large amount of waste discharge, and the greening degree of the process is not high, so it is urgent to improve and improve

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