Membrane absorption method and device for producing sodium bisulfide with refinery acid gases

Abstract

The invention discloses a membrane absorption method and a device for producing sodium bisulfide with refinery acid gases. The device mainly consists of a storage tank, primary and secondary membrane absorption assemblies, a hydrogen sulfide refinement and solvent recovery device, a solvent regeneration tower, an evaporator, molding (slicing) equipment and the like. According to the method and the device, the primary and secondary membrane absorption assemblies are used and flow rates of the acid gases and MDEA (methyldiethanolamine) are controlled, so that hydrogen sulfide is absorbed fully, and carbon dioxide, inert gases and hydrocarbon are not absorbed or are absorbed rarely; the hydrogen sulfide subjected to refinement and solvent recovery is contacted with and reacts with a sodium hydroxide solution, and the sodium bisulfide is produced. The method and the device are low in energy consumption and investment cost and significant in economic benefit.

Description

technical field [0001] The invention relates to a method and a device for purifying and recovering sodium hydrosulfide solution, and is particularly suitable for a technical method for producing sodium hydrosulfide using refinery acid gas as a raw material. Background technique [0002] In the petrochemical industry, the refinery will produce acid gas during the production process, including hydrogen sulfide with a mass fraction of 85%-95%, carbon dioxide at 3%-10%, organic gas at 2%-5%, and organic gas at 0.5%-3 % of other components, other organic gases include methane, ethane, ethylene, propane, propylene, etc. These acid gases will produce foul smell, which is not only harmful to human health, but also pollutes the environment. [0003] At present, sodium hydroxide solution is generally used to absorb the acid gas discharged from petrochemical refineries to produce sodium hydrosulfide solution, but because the acid gas contains some carbon dioxide, impurities such as so...

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Problems solved by technology

[0003] At present, sodium hydroxide solution is generally used to absorb the acid gas discharged from petrochemical refineries to produce sodium hydrosulfide solution, but because the acid gas contains some carbon dioxide, impurities such as sodium carbonate and sodium bicarbonate will be generated during the production process, and the absorption solution is separated and purified. , to obtain sodium bisulfide liquid product, but the generated impurity sodium carbonate and sodium bicarbonate are likely to cause pipeline blockage in the production process, which brings inconvenience to production. low puzzle

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