Comprehensive treatment device and method for treating acidic exhaust gas from refinery plant

Abstract

The invention relates to a comprehensive treatment device and method for treating acidic exhaust gas from a refinery plant. The device mainly consists of an acidic exhaust gas (H2S/CO2) buffer tank, a H2 buffer tank, a stage I reactor, a stage II reactor, a reboiler, a cooler, a condensation tank, a compressor, an absorption tower, an alcohol amine reflux tank, a solvent regeneration tower, a NaHS reaction tower, a NaOH storage tank and a pump. The method is as follows: the stage I reactor and the stage II reactor which are filled with different catalysts are used to perform catalytic hydrogenation on CO2 to generate C1-C3 alkanes, methanol, dimethyl ether, CO and other low alcohols and ethers; H2S does not participate in the reaction and is absorbed by an alkanolamine solution in the absorption tower; the produced alcohol and ether are cooled and recycled; CO, H2 and hydrocarbons cannot be absorbed and directly enter the pipe network, and after purification and solvent regeneration, H2S is released and is in contact with NaOH for reaction to produce NaHS. The comprehensive treatment device and method for treating acidic exhaust gas from the refinery plant are efficient, environment-friendly, energy-saving and high in product added value.

Description

technical field [0001] The present invention relates to CO 2 Catalytic hydrogenation conversion, as well as purification and recovery of H 2 The invention relates to a device and method for producing NaHS from S gas, in particular to a device and method suitable for comprehensive treatment of acid tail gas in refineries. Background technique [0002] In the petrochemical industry, refineries need to hydrodesulfurize gasoline and diesel in order to improve the quality of oil products. During the production process of this process, a large amount of sulfuric acid gas will be produced. The gas components usually include 85%~95% H 2 S, 3%~10% CO 2 , 2%~5% of light hydrocarbons, 0.5%~1% of other components. These acid gases have a strong foul smell, which will endanger human health and cause environmental pollution. [0003] At present, refineries generally adopt the Claus method (Kraus) to convert H 2 S is converted into sulfur element, or acid gas is directly absorbed by N...

AI Technical Summary

Problems solved by technology

These acid gases have a strong foul smell, which will endanger human health and cause environmental pollution.

[0003] At present, refineries generally adopt the Claus method (Kraus) to convert H 2 S is converted into sulfur element, or acid gas is directly absorbed by NaOH. The former has the problem of relatively low economic value of sulfur element, while the latter has the problem of H 2 S and CO 2 After the mixed gas is absorbed by NaOH, the product is difficult to separate and purify, and the generated NaCO 3 and NaHCO 3 It is easy to crystallize and precipitate and cause pipeline blockage, resulting in inconvenient production.

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