A method and device for producing sodium bicarbonate from acid gas and purifying hydrogen sulfide

Abstract

The invention provides a method and device for producing sodium bicarbonate from acid gas and purifying hydrogen sulfide. The process method uses sodium carbonate solution as the absorption liquid and sodium sulfide solution as the protection liquid, and undergoes absorption reaction, heating, flash evaporation and The four-stage process of solid-liquid separation and gas cooling and collection realizes the discharge of tail gas up to the standard, and produces chemical products that meet the national product quality standards. The process device is composed of a liquid film absorption reactor, a heat exchanger, a flash separation tank and a cooler. The acid gas treatment method and device of the present invention use sodium carbonate and acid gas as raw materials to produce solid sodium bicarbonate and high-purity hydrogen sulfide gas, and realize the dual goals of acid gas purification and pollutant recycling.

Description

technical field [0001] The invention relates to an acid gas treatment method and device, belonging to the field of chemical engineering, suitable for the comprehensive utilization of acid gas in the field of petrochemical industry, especially suitable for producing solid sodium bicarbonate and purifying hydrogen sulfide gas by using acid gas. Background technique [0002] Sulfur element is ubiquitous in fossil fuels. When petroleum enters the process of fine fractionation and deep processing, it forms hydrogen sulfide gas with hydrogen. This process is often accompanied by carbon dioxide gas and ammonia gas. Sulfur element also exists in the raw materials of the metallurgical industry, but because the processing process is mostly under high temperature conditions, the sulfur element is oxidized, mainly producing sulfuric acid gas. Other working conditions that generate acid gas mostly occur in the chemical production process or the use process of chemical products. [0003]...

AI Technical Summary

Problems solved by technology

This technology has problems such as expensive desulfurization catalyst, sulfur foam entrainment catalyst, low purity of sulfur product, and solid waste generation.

[0017] Acid gas is a mixed gas of hydrogen sulfide and carbon dioxide gas: in the field of petrochemical industry, acid gas is usually a mixture of hydrogen sulfide and carbon dioxide. When using alkali agent as absorbent to produce sodium sulfide or sodium hydrogen sulfide solution products, sulfide gas is usually formed. Sodium, sodium bisulfide, sodium carbonate, sodium bicarbonate and other substances, when the concentration reaches a certain value, crystallization will occur, causing the device to be blocked and continuous production cannot be realized normally

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