Treatment method for hydrochloric acid production tail gas

Abstract

The invention provides a treatment method for hydrochloric acid production tail gas. The treatment method comprises the following steps: an absorption liquid is pumped to a spray absorption device toabsorb the tail gas generated in hydrochloric acid production by furnace ignition and provide a vacuum degree for a synthetic furnace system, the tail gas enters a tail-gas absorption device, the tail-gas absorption device countercurrently absorbs tail gas subjected to gas-liquid separation, after the synthetic furnace normally operates, the produced hydrochloric acid production tail gas is sent to the tail-gas absorption device for countercurrent absorption, and after the absorption liquid is saturated, the saturated absorption liquid is conveyed out for preparing a relevant recycled product.The treatment method for the hydrochloric acid production tail gas provided by the invention adopts a combination of a water jet pump and an absorption tower, and does not require high-temperature vacuum adsorption, thereby effectively avoiding safety problems such as hydrogen chloride gas volatilization caused by too-high absorption temperature, and realizing improvement of tail gas absorption efficiency through synergistically regulating and controlling liquid supply temperature and liquid outlet temperature of the absorption liquid, wherein the absorption efficiency of hydrogen chloride gas and chlorine gas are all 95% or more; the absorption tower does not contain a filler, so that aggregation temperature is prevented from being too high; and multi-stage spray nozzles are arranged, sothat high-efficiency safe absorption is realized.

Description

technical field [0001] The invention relates to the technical field of chemical industry, more specifically, to a method for treating hydrochloric acid tail gas. Background technique [0002] Synthetic furnaces produce various products such as hydrochloric acid and hydrogen chloride. The main raw materials are chlorine and hydrogen. During the production process of the product, a large amount of tail gas will be volatilized. During production, chlorine or hydrogen chloride will be taken out by the tail gas. If chlorine or hydrogen chloride is not treated with an effective and feasible process method, it will not only cause a large amount of waste of production raw materials, but also cause serious environmental pollution problems. The existing treatment method is often evacuated by a single water jet pump. If it is less than the emission standard, the exhaust gas absorption rate is not high, and the spray absorption will easily cause the temperature to be too high, causing e...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the defects and deficiencies in the absorption of existing hydrochloric acid tail gas, and provide a treatment method for hydrochloric acid tail gas. The treatment method of the present invention uses a water jet pump and an absorption tower to control the temperature in the absorption tower. Monitoring, effectively avoiding safety problems such as hydrogen chloride gas volatilization caused by high absorption temperature, and improving the overall tail gas absorption efficiency

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