A method for recovering and utilizing exhaust tail gas synthesized from organosilicon crude monomer

Abstract

The invention relates to a method of recovery and utilization of a vented tail gas of organosilicon crude monomer synthesis, a lot of tail gas are vented by a methyl chloride column in the organosilicon monomer synthesis process, a small amount of reaction product are removed, the vented tail gas mainly comprises boosting gas nitrogen brought into the system and methyl chloride gas which cannot be condensed, the boosting gas nitrogen is an inorganic small molecule, the methyl chloride gas is an organic compound, and the boosting gas nitrogen and the methyl chloride gas can be separated by a membrane separation technique. The separated non-condensable gas can replace fresh nitrogen to be used as a boosting gas in the production; and the separated methyl chloride can be compressed by a compressor, and recovered and utilized. Under the premise of smooth venting, by low cost low difficulty process transformation, the boosting gas nitrogen consumption can be reduced, a large amount of non-condensable gas brought into the system by silica fume and catalyst feeding and back-to-bed fine powder can be reduced, the methyl chloride brought by venting of the tail gas of the methyl chloride column can be reduced, and the methyl chloride wasted by the venting of the tail gas can be recovered and utilized.

Description

technical field [0001] The invention belongs to the field of chemical production, and in particular relates to a method for recycling methyl chloride and non-condensable gas in vent tail gas synthesized from organosilicon crude monomer as boosting gas. Background technique [0002] At present, in the synthesis of domestic organosilicon crude monomers, nitrogen is generally used as the booster gas for the feeding of silicon powder and catalyst and the return of fine powder to the bed, while the non-condensable gas of the methyl chloride tower is used as tail gas to vent. The specific process is as follows: [0003] Since the feeding of silicon powder and catalyst and the return of fine powder to the bed use nitrogen as a booster gas, a large amount of nitrogen is consumed and non-condensable gas is brought into the system to a large extent, which is recovered for the cooling of the methyl chloride tower in the subsequent system. increased difficulty [0004] A large amount o...

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Problems solved by technology

[0003] Since the feeding of silicon powder and catalyst and the return of fine powder to the bed use nitrogen as a booster gas, a large amount of nitrogen is consumed and non-condensable gas is brought into the system to a large extent, which is recovered for the cooling of the methyl chloride tower in the subsequent system. increased difficulty

[0004] , resulting in a large amount of non-condensable gas being vented through the automatic regulating valve 1, and the process of venting carries away a lot of methyl chloride at the same time, which will also cause certain pollution to the environment

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