Method and apparatus for producing sodium bicarbonate by using acidic gas

Abstract

The invention provides a method and apparatus for producing sodium bicarbonate by using acidic gas. The process employs sodium carbonate solution as an absorption liquid, sodium hydroxide solution as a washing liquid and sodium sulfhydrate as a protective solution, and comprises six sections of absorption reaction, solid-liquid separation, washing, an air-slake pneumatic conveying gas device and bagging, so as to achieve exhaust emissions on standard, and produce sodium bicarbonate chemical product in line with national standards for quality of products. The apparatus comprises a liquid film absorption reactor, a solid-liquid separator, a scrubber, an air-slake pneumatic conveying gas device, a cyclone separator, a process pipeline and a pump. The acidic gas treatment method and apparatus achieve dual goals of acidic gas purification and contaminant recycling.

Description

technical field [0001] The invention relates to a method and device for producing sodium bicarbonate by using acid gas, which belongs to the field of chemical engineering and is suitable for the comprehensive utilization of mixed gas rich in hydrogen sulfide and carbon dioxide in acid gas in the field of petrochemical industry, especially suitable for the concentration of carbon dioxide in acid gas higher operating conditions. 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 occu...

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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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