System and method for removing disulfide from regeneration exhaust gas of caustic fluid used in liquid gas sweetening process

Abstract

The invention relates to a system and method for removing disulfide from regeneration exhaust gas of caustic fluid used in liquid gas sweetening process. The system comprises a water-washing tank, a membrane separator and an oxidation tank, wherein the top and bottom of the inner wall of the water-washing tank are separately provided with a water-washing tank demister and a water-washing tank gas distributing plate which are fixed through bolts; the top of the water-washing tank is connected with the bottom of the membrane separator through a gas discharge pipe; the inside of the membrane separator is provided with a microporous membrane internal part and a coalescence plate which are fixed through bolts; the top of the membrane separator is connected with the oxidation tank through another gas discharge pipe; and the top and bottom of the inner wall of the oxidation tank are separately provided with an oxidation tank demister and an oxidation tank gas distributing plate. The realization method of the invention involves the microbubble water-washing technology, the microporous membrane separation technology and the sulphide oxidation technology. The beneficial effects of the system and method of the invention are as follows: no power is consumed, the recycled disulfide can be used as the chemical raw material, the desulfurization efficiency is high, the cost for treating the exhaust gas is low, and the system and method are environmentally friendly and economical.

Description

technical field [0001] The invention relates to the technical field of chemical tail gas treatment. In particular, it relates to a system and method for removing disulfides from liquefied gas sweetening alkali solution oxidation regeneration tail gas. Background technique [0002] Because crude oil contains sulfides to varying degrees, liquefied gas produced by refineries inevitably contains mercaptans. No matter whether liquefied gas is used as raw material for gas separation or as civil liquefied gas, it must go through the sweetening process. At present, liquefied gas demercaptan is mostly used in alkaline washing process. Through different forms of reaction equipment, the sodium hydroxide aqueous solution is fully contacted with the liquefied gas, and the sodium hydroxide reacts with the mercaptan in the liquefied gas to form sodium mercaptide, thereby realizing the liquefied gas The purpose of sweetening. After mercaptan removal, the lye containing sodium mercaptide ...

AI Technical Summary

Problems solved by technology

The mixture is oily, and it is easy to volatilize with the lye oxidation tail gas. After the disulfide is incinerated, it will generate sulfur dioxide, which will cause dew point corrosion to the equipment;

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