Liquefied gas desulfurizing and refining method

Abstract

The invention relates to a method of liquefied gas refining desulfurization that includes the following steps: putting the liquefied gas need to refining into pre-desulfurization tower to take desulfurization reaction; filtering in the sand tower after separating in separating tower; adding desulfurization agent into oxidizing regeneration tower to take oxidizing regeneration and could periodic duty after being separated. If the liquefied gas does not meet the request, it could take further oxidation sweetening mellow with sulfonation lush coblt activator, alkaline liquor and air, then separating, filtering to gain refined product. The invention has good desulfurization effect, low cost, simple device and has no secondary pollution.

Description

technical field [0001] The invention relates to a method for refining liquefied gas by using a desulfurizer. It is an improvement on the refining method of liquefied gas in petrochemical production. It mainly realizes the refining of liquefied gas through the combination of pre-desulfurization refining and sweetening refining of liquefied gas by using a desulfurizer. Background technique [0002] The liquefied gas from catalytic cracking, delayed coking and other devices in the process of petroleum refining contains a large amount of sulfide, except for H 2 In addition to S, it also contains various forms of organic sulfur, such as CH 3 SH, C 2 h 5 SH, CH 3 SCH 3 , COS, etc., mainly CH 3 sh. Sulfides are harmful substances in oil products and have a strong odor. Their existence will not only lead to a decline in oil quality and seriously affect its performance, but also cause poisoning and deactivation of catalysts during processing; active sulfides such as elemental...

AI Technical Summary

Problems solved by technology

[0007] 1) Cobalt phthalocyanine catalysts are easily aggregated and deactivated in the alkali phase, resulting in frequent replacement of catalysts, high catalyst costs, and at the same time affecting production to a certain extent. Moreover, during the production process, it is easy to cause liquefied gas loss accidents, resulting in production insecurity

[0008] 2) Liquefied petroleum gas is extracted with lye containing catalyst for mercaptan. In the presence of catalyst, sodium mercaptide is easy to generate disulfide and is brought into the refined liquefied gas product, causing the total sulfur content of liquefied gas to exceed the standard

[0009] 3) Increased environmental pressure due to the use of liquid caustic

This technology must increase gas equipment, and because the alkalinity of ammonia water is weaker than that of caustic alkali, it is difficult to completely remove some organic sulfur in liquefied gas in the pre-alkali washing unit

There is also the use of solid alkali washing instead of liquid alkali washing, and then mixed with the active agent into the deodorization tower for deodorization and separation. This technology realizes alkali-free deodorization, but it needs to add a special activator

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