Methylchlorosilane production waste gas incineration process

Abstract

The invention discloses a process and a device for incinerating waste gas produced by methyl chlorosilane. The pressure of the waste gas produced by methyl chlorosilane is adjusted and then sent to an incinerator. After incineration, the flue gas is removed by NCR and then enters a waste heat recovery device. The recovered flue gas enters the quenching tower, enters the hydrochloric acid absorption tower to remove most of the hydrogen chloride after quenching and cooling, and then further removes chlorine through the alkali washing tower, finally removes the dust through the wet electrostatic precipitator, and discharges it at high altitude after heating. The invention has simple technological process, energy saving and environmental protection, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of methylchlorosilane production, in particular to a technology for waste gas treatment of methylchlorosilane production. Background technique [0002] In the production process of methylchlorosilane, the methylchlorosilane synthesis device and separation device will generate a large amount of waste gas, which is a recognized problem in the industry. The waste gas mainly includes methyl chloride, nitrogen, methylchlorosilane, hydrogen chloride, hydrocarbons and a small amount of silicon powder. This part of the waste gas is generally treated by water washing. Although the operation cost of the water washing process is low, it will produce a large amount of waste water containing salt and oil, and the waste water treatment cost is high, and part of the waste gas does not react with water or is insoluble in water, and is discharged into the atmosphere, causing odor, polluting the environment and harmful to hu...

AI Technical Summary

Problems solved by technology

In order to avoid the production of dioxins, the working temperature of the cyclone separator is above 550 degrees, which requires high material requirements, and the fumed silica produced by incineration has low density and small amount, and the cyclone separation is basically ineffective.

The flue gas from the incinerator contains a large amount of nitrogen and carbon dioxide, so that the absorption efficiency of hydrogen chloride is not high during the falling film absorption, resulting in a large load of alkali washing and high alkali consumption

This process route cannot effectively remove the tail gas dust entrainment and nitrogen oxides, and does not meet the requirements of the national standard, and the tail gas temperature is low and the water content is high, and the high-altitude emission has white visual pollution

Another disadvantage of this process is that due to the low discharge pressure of the exhaust gas in the methyl chlorosilane separation process, generally 0.03-0.05Mpa(G), there is a pressure loss during transportation, and it cannot enter the incineration system smoothly.