Efficient and energy-saving type washing and dedusting method for organic silicon monomer synthesis gas

Abstract

The invention discloses a high-efficiency energy-saving type washing and dedusting method for organic silicon monomer synthesis gas, which comprises the following steps: (1) washing and separating the organic silicon monomer synthesis gas: introducing the organic silicon monomer synthesis gas into the lower part of a washing tower, and carrying out mass and heat transfer on the organic silicon monomer synthesis gas and washing liquid from the upper part of the washing tower; extracting a tower top gas-phase material from a tower top outlet, and extracting a dust-containing high-waste liquid-phase material from a tower bottom outlet; (2) condensing and separation of the tower top gas-phase material: condensing the tower top gas-phase material in a condenser, enabling condensate to enter a washing tower to serve as washing liquid, and introducing the tower top gas-phase material which is not condensed into a crude monomer tower; and (3) heating and separation of the dust-containing high-waste liquid-phase material: introducing the dust-containing high-waste liquid-phase material into a tower kettle reboiler for heating, feeding the separated tower top gas-phase material into a washing tower, and feeding the dust-containing high-waste liquid into a flash tank. The method has the advantages of being reasonable, easy to implement, low in operation cost and remarkable in washing effect.

Description

technical field [0001] The invention belongs to the technical field of organosilicon production technology, and in particular relates to a high-efficiency and energy-saving washing-type washing and dust removal method for organosilicon monomer synthesis gas. Background technique [0002] The technical barriers in the silicone industry are mainly reflected in the synthesis of methylchlorosilane monomers, and the production level of methylchlorosilane monomers directly reflects the overall level of the silicone industry. The foreign organosilicon methyl chlorosilane monomer production technology is mainly mastered by developed countries such as the United States, Germany, Japan, and France, such as Dow Corning, Momentive, Shin-Etsu, and Wacker. The production process is basically the same , both adopt the fluidized bed synthesis process of silicon powder and methyl chloride. The difference lies in the fluidization quality of the fluidized bed reactor, the formulation of the co...

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Problems solved by technology

In the existing technology, the washing method of methylchlorosilane synthesis gas is to send it to the washing tower device for washing and dust removal after cyclone separation and dry dust removal. The washed synthesis gas is condensed into liquid through the condenser, and part of it is returned to the washing tower for washing and mixing. Gas, part of which is sent to the tower to separate methyl chloride and mixed monomers. In the above-mentioned process, the methylchlorosilane synthesis gas passes through the gas distributor from the lower part of the washing tower, and passes through the tray from bottom to top under the action of pressure difference. The reflux washing liquid passes through the tray from top to bottom. During this process, the mass transfer and heat transfer between the methyl chlorosilane synthesis gas and the washing liquid occurs, and the solid particles in the methyl chlorosilane synthesis gas are fully removed under the leaching of the washing liquid. , so as to achieve the effect of gas separation, purification and dust removal, the above washing process has the following deficiencies in the implementation process: First, because the condenser at the top of the washing tower uses circulating water as the cooling medium, all the gas phase after dust removal by the washing tower is condensed In this condensation process, it is mainly considered that the synthesis is condensed into a liquid, and part of the liquid fully washes the synthesis gas in the scrubber to remove the silicon powder in the synthesis gas. During this process, the pressure drop and reflux temperature of the scrubber are never considered. and other factors lead to the insufficient and effective washing of the methylchlorosilane synthesis gas discharged from the outlet of the fluidized bed reactor, which makes the dust removal and washing effect of the methylchlorosilane synthesis gas unsatisfactory; Insufficiencies in the design process, such as the overcooling of the reflux liquid temperature and the large pressure difference of the scrubber, not only greatly waste the heat entrained in the methylchlorosilane synthesis gas coming out of the fluidized bed reactor, but also increase the volume of the crude monomer tower. Reboiler steam consumption, increased unit operating costs

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