System and method for purifying and recycling HCL-containing waste gas

Abstract

The invention relates to a system and a method for purifying and recycling HCL-containing waste gas. The system comprises an absorption tower and a stripping tower, an inlet at the lower part of the absorption tower is respectively communicated with HCL-containing waste gas and silicon tetrachloride liquid through pipelines; a first heat exchanger is also arranged on the communicating pipeline between the HCL-containing waste gas and the absorption tower; a bottom outlet of the absorption tower is connected with a circulating pump through a pipeline; the outlet of the circulating pump is respectively communicated with the inlet of a second heat exchanger and an upper inlet of the stripping tower; an outlet of the second heat exchanger is communicated with an upper inlet of the absorption tower, a bottom outlet of the stripping tower is communicated with a lower inlet of the stripping tower through the third heat exchanger, the top of the stripping tower is connected with a high-purityHCL gas outlet pipeline, and the second heat exchanger and the third heat exchanger are connected with a cold source and a heat source respectively. According to the purification and recovery method disclosed by the invention, the HCL-containing waste gas in the organosilane production process is purified and recycled by utilizing low-temperature absorption and high-temperature desorption of silicon tetrachloride on HCL.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a system and method for purifying and recovering waste gas containing HCL. Background technique [0002] In the production of organosilane coupling agents, the reaction process is often used to react chlorosilanes with alcohols, and a large amount of HCL-containing waste gas is generated during the production process, because the components in the waste gas are complex, especially containing alkoxysilane and Alcohols cannot be used directly. In the existing process, the waste gas containing HCL is usually rinsed with alkaline water, and then the waste water is sent to the sewage treatment station for treatment. The waste water purification process is complicated, the treatment cost is high, and it is a pity that a large amount of useful resources enter the water body. Contents of the invention [0003] In order to overcome the above-mentioned deficiencies in the prior art, the...

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Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the present invention proposes a system and method for purifying and recovering waste gas containing HCL, which solves the problem of complex purification process, high processing cost and large waste of useful components in the existing organosilane production process. technical problem

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