Method and device for lye extraction desulfurization

Abstract

The invention provides a method and device for desulfurization from hydrocarbon flow thorough alkaline liquid suction. It is to add a gas- removal system between oxidation system and phase separation system, and introduce inert gas into gas- removal system to exchange oxidative gas and then effectivelyt promote the separation of sulfur dioxide or sulfur dioxide- containing solvent from regenerative alkaline liquid in phase separation system, and the thiol in hydrocarbon flow can be inhibited from oxidation by oxidative gas in suction system, which enables thorough desulfurization by alkaline liquid suction.

Description

technical field [0001] The invention belongs to the refining field of hydrocarbon materials. Specifically, the present invention relates to a method and equipment for desulfurizing hydrocarbon material fluids, ie hydrocarbon streams, through alkaline extraction. Background technique [0002] Alkaline extraction is a traditional method for refining hydrocarbon materials, widely used in the sweetening and refining of hydrocarbon materials such as liquefied petroleum gas, gasoline, diesel oil, naphtha, alkanes, and olefins. The method is to contact the fluid of the hydrocarbon material, that is, the hydrocarbon stream with the lye, and the mercaptan in the hydrocarbon stream is removed from the oil by reacting with the lye to form mercaptide. [0003] If the lye containing mercaptide is discharged directly, it is neither economical nor environmentally friendly. Oxidation is usually used to oxidize mercaptides into disulfides so that the lye containing mercaptides is regenerat...

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Problems solved by technology

However, it must be noted that in the prior art, especially in practical applications, the content of mercaptans absorbed into the lye changes accordingly due to changes in the content of mercaptans in the hydrocarbon stream. Alkali regeneration is complete, and it is usually necessary to inject an oxidizing gas much higher than the theoretical meter into the oxidation system, and the excess oxidizing gas usually flows into the phase separation system together with the alkali solution, and it is difficult to completely release it in the phase separation system

[0007] This leads to two defects: one is that the oxidizing gas flowing into the phase separation system is easy to form bubbles in the lye, which affects the settlement and separation of the regenerated lye and the disulfide phase or the solvent phase containing disulfide, making the regenerated lye Disulfides or disulfide-containing solvents ar...

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