A process and equipment for recovering organic silicon monomer and dust in exhaust gas

Abstract

The invention relates to a process and equipment for recycling organic silicone monomers and dust in vented tail gas. A filter top tail gas outlet in the equipment is connected with a special filter inlet, a special filter top tail gas outlet is connected with a tail gas condenser inlet, a tail gas condenser condensate outlet is connected with a condensate recycling groove inlet, and a condensate recycling groove bottom outlet is connected with a crude monomer middle groove top inlet. The equipment is adopted for recycling organic silicone monomers and dust in vented tail gas, solid phases (silica powder, copper powder and the like) and vapor phases (monomers) in tail gas generated in the organic silicon monomer production process are recycled in a classified mode, the phenomenon that remaining dust blocks a condenser is avoided, the phenomenon that monomers enter a water scrubber to form acid mist, the fine powder recycling rate is increased from about 80% in the existing process to 99.9% or above, the organic silicon monomers in tail gas is recycled by 99% or above instead of total evacuation in the prior art, and environmental pollution is avoided while the raw material utilization rate is improved.

Description

technical field [0001] The invention relates to a process and equipment for efficiently recovering dust and monomers in the exhaust gas of organosilicon monomers, belonging to the technical field of organosilicon production. Background technique [0002] During the production process of methylchlorosilane monomer, the material at the bottom of the fine powder storage tank is solid powder such as silicon powder and copper powder separated by the cyclone separator, and the top is methylchlorosilane synthesis gas. The powder in the fine powder storage tank is returned to the fluidized bed reactor through pneumatic conveying to participate in the synthesis reaction. After the powder in the storage tank is conveyed, the pressure must be released in time to prepare for the next stage of receiving. Due to the high temperature in the fine powder storage tank, both methyl chloride and synthesis gas are in a gas phase state, and will be wasted if not properly treated when the fine pow...

AI Technical Summary

Problems solved by technology

The disadvantages of this venting tail gas treatment process are: (1) After the venting tail gas passes through the dust collector, it still contains a certain amount of fine powder with a smaller particle size, and enters the water washing tower with the tail gas, which increases the consumption of silicon powder. After that, it directly enters the condenser for condensation, and the unremoved fine powder will block the condenser; (2) The methyl chloride and synthesis gas in the vented tail gas cannot be recycled, resulting in an increase in the loss of methyl chloride. At the same time, the synthesis gas enters the water washing tower Acid mist and colloids are produced, acid mist pollutes the atmosphere, and colloids block the trays of the washing tower, affecting the washing effect

(3) A large amount of waste of raw materials is not conducive to saving production costs

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