Treatment method for alkali liquor oxidation regeneration tail gas containing mercaptide

Abstract

The invention relates to a treatment method for an alkali liquor oxidation regeneration tail gas containing mercaptide. The treatment method comprises the following steps: feeding a to-be-treated alkali liquor oxidation regeneration tail gas containing mercaptide from the bottom of a washing tank, penetrating though a gas distribution plate in the tank, discharging from an exhaust gas pipe at the top of the washing tank, and feeding to an air inlet in the bottom of a dewatering tank; drying through a drying agent in the dewatering tank, feeding into a supergravity separator, contacting diesel oil fed from a liquid-phase inlet of the supergravity separator, and feeding into a gasoline and diesel oil separation recovery tank from a gas-phase outlet of the supergravity separator, wherein a crane of the supergravity separator is a rotary packing bed which is operated in a gas-liquid countercurrent, cocurrent flow or baffle flow form; and the operation ranges of the supergravity separator are as follows: the gas-liquid ratio is (5-2,000) to 1, the operation gage pressure is 0-0.3MPa and the operation temperature is 10-60 DEG C. According to the method, ultra-low sulphur emission of a liquefied gas alkali liquor oxidation regeneration tail gas is reached; desulfurization treatment can be carried out on absorbent diesel oil in a hydrogenation device; and the total sulfur emission in three wastes of factories is effectively reduced.

Description

technical field

[0001] The invention belongs to the field of oil refining and chemical industry, and relates to a treatment method for oxidation regeneration tail gas of alkaline solution containing mercaptan. Background technique

[0002] Since crude oil contains sulfides to varying degrees, during the refining process of crude oil, sulfur in different forms of light and heavy will enter the corresponding products according to the difference in boiling point. According to the characteristics of the distillation range of liquefied gas products, the sulfur form entering into it is mainly hydrogen sulfide , Methanethiol and Ethanthiol. At present, the demercaptan process of liquefied petroleum gas mainly adopts alkali washing. Under certain temperature, pressure and sufficient contact conditions, mercaptan contained in liquefied petroleum gas reacts with sodium hydroxide solution to form sodium mercaptide, which becomes inorganic sulfur and enters the alkali solution. , so as...

Examples

Embodiment 1

[0015] like figure 1 As shown, the oxidative regeneration tail gas 1 containing mercaptan alkali solution to be treated enters from the bottom of the water washing tank (2), passes through the gas distribution plate 3, and exits from the top of the water washing tank after washing and removing alkali, enters the dehydration tank 4 from the bottom, passes through the desiccant 11 After drying and dehydration, it enters the supergravity separator 5, and after being fully contacted with the absorbent diesel oil 6, the exhaust gas enters the absorbed exhaust diesel oil separation and recovery tank 10, and after oil and gas separation, the exhaust gas 8 is purified and discharged up to the standard, and the absorbed rich diesel oil 7, 9 Sent to hydrogenation unit for desulfurization. The tail gas diesel oil separation and recovery tank 10 is filled with wire mesh or microsphere particles 12 .

Embodiment 2

[0017] like figure 2 As shown, the oxidative regeneration tail gas 1 containing mercaptan alkali solution to be treated enters from the bottom of the water washing tank 2, passes through the gas distribution plate 3, and exits from the top of the water washing tank after washing and removing alkali, enters the supergravity separator 5, and is mixed with the absorbent diesel oil 6 After full contact, the tail gas enters the absorbed tail gas diesel oil separation and recovery tank 10, and after oil and gas separation, the exhaust gas 8 is purified and discharged up to the standard, and the absorbed rich diesel oil 7, 9 is sent to the hydrogenation device for desulfurization.

technical field

[0001] The invention belongs to the field of oil refining and chemical industry, and relates to a treatment method for oxidation regeneration tail gas of alkaline solution containing mercaptan. Background technique

[0002] Since crude oil contains sulfides to varying degrees, during the refining process of crude oil, sulfur in different forms of light and heavy will enter the corresponding products according to the difference in boiling point. According to the characteristics of the distillation range of liquefied gas products, the sulfur form entering into it is mainly hydrogen sulfide , Methanethiol and Ethanthiol. At present, the demercaptan process of liquefied petroleum gas mainly adopts alkali washing. Under certain temperature, pressure and sufficient contact conditions, mercaptan contained in liquefied petroleum gas reacts with sodium hydroxide solution to form sodium mercaptide, which becomes inorganic sulfur and enters the alkali solution. , so as...

Examples

Embodiment 1

[0015] like figure 1 As shown, the oxidative regeneration tail gas 1 containing mercaptan alkali solution to be treated enters from the bottom of the water washing tank (2), passes through the gas distribution plate 3, and exits from the top of the water washing tank after washing and removing alkali, enters the dehydration tank 4 from the bottom, passes through the desiccant 11 After drying and dehydration, it enters the supergravity separator 5, and after being fully contacted with the absorbent diesel oil 6, the exhaust gas enters the absorbed exhaust diesel oil separation and recovery tank 10, and after oil and gas separation, the exhaust gas 8 is purified and discharged up to the standard, and the absorbed rich diesel oil 7, 9 Sent to hydrogenation unit for desulfurization. The tail gas diesel oil separation and recovery tank 10 is filled with wire mesh or microsphere particles 12 .

Embodiment 2

[0017] like figure 2 As shown, the oxidative regeneration tail gas 1 containing mercaptan alkali solution to be treated enters from the bottom of the water washing tank 2, passes through the gas distribution plate 3, and exits from the top of the water washing tank after washing and removing alkali, enters the supergravity separator 5, and is mixed with the absorbent diesel oil 6 After full contact, the tail gas enters the absorbed tail gas diesel oil separation and recovery tank 10, and after oil and gas separation, the exhaust gas 8 is purified and discharged up to the standard, and the absorbed rich diesel oil 7, 9 is sent to the hydrogenation device for desulfurization.

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