Method for recovering and purifying hydrocarbon wastegas by condensation and adsorption

A technology of condensation recovery and adsorption recovery, applied in chemical instruments and methods, separation methods, vapor condensation, etc., can solve the problems of uneven temperature of activated carbon bed, lowering the performance of adsorbents, and lowering the concentration of regeneration tail gas. The effect of producing secondary pollution, facilitating further treatment or utilization, and increasing the concentration of regeneration gas

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of condensation and catalytic oxygen can recover most of the volatile hydrocarbons, and can also achieve up-to-standard discharge of tail gas, but its disadvantages are that the process is long, the operation cost is high, and the economy is affected
When heating and regenerating, if the heating medium is not passed in, because activated carbon is a thermally poor conductor, it is easy to cause uneven temperature of the activated carbon bed layer, or even hot spots, resulting in uneven regeneration, which will reduce the performance of the adsorbent; when using heat medium, it may cause The concentration of regeneration tail gas is reduced, which is not conducive to further treatment and utilization

Method used

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  • Method for recovering and purifying hydrocarbon wastegas by condensation and adsorption
  • Method for recovering and purifying hydrocarbon wastegas by condensation and adsorption
  • Method for recovering and purifying hydrocarbon wastegas by condensation and adsorption

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Embodiment 1

[0026] In the exhaust gas discharged from the sour water storage tank area of ​​an enterprise, the concentration of total hydrocarbons is 20×10 4 ~60×10 4 mg / m 3 , the sulfide concentration is 50mg / m 3 about. First, the sodium hydroxide solution is used to absorb and remove the sulfide. After the sodium hydroxide solution is absorbed, the sulfide is not detected and is close to zero. Then condense to about 4°C in the dehydration steam condenser for dehydration, and then cool to about -65°C in the hydrocarbon recovery condenser, the total hydrocarbon concentration in the discharged non-condensable gas is 4×10 4 mg / m 3 Left and right, the non-condensable gas is adsorbed in the activated carbon tank. There are two activated carbon beds in the activated carbon adsorption tank, and a water vapor heat exchanger is installed between the two activated carbon beds. The total hydrocarbon concentration of the exhaust tail gas is lower than 120mg / m 3 , up to emission standards.

[0...

Embodiment 2

[0031] A gasoline oxidative sweetening tail gas and liquid hydrocarbon oxidative sweetening tail gas, the total hydrocarbon concentration is 30×10 4 ~80×10 4 mg / m 3 . Condensed in the dehydration steam condenser to about 2°C for dehydration, then cooled to about -70°C in the hydrocarbon recovery condenser, the total hydrocarbon concentration in the discharged non-condensable gas is 3×10 4 mg / m 3 Left and right, non-condensable gas is adsorbed in the activated carbon tank. There are three activated carbon beds in the activated carbon adsorption tank, and a water vapor heat exchanger is installed between each two activated carbon beds. The total hydrocarbon concentration of the exhaust tail gas is lower than 120mg / m 3 , up to emission standards.

[0032] In the activated carbon regeneration process, after one activated carbon tank is saturated, it is switched to another activated carbon tank for adsorption operation, and the saturated activated carbon tank is used for regene...

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Abstract

The invention relates to a method for recovering and purifying hydrocarbon wastegas by condensation and adsorption, which comprises the following steps: firstly condensing hydrocarbon wastegas to remove water vapor; and recovering hydrocarbon by further condensation, performing activated carbon adsorption on gases not condensed and adsorbing exhaust by activated carbon, wherein the activated carbon adsorption at least comprises two activated carbon adsorption tanks for the switching operation of adsorption and regeneration, the activated carbon adsorption tanks at least comprise two activated carbon bed layers inside; and during the regeneration operation, the regenerative gas is subjected to at least once vapor heat exchange and temperature rise in the process of passing through the activated carbon bed layer. The method for recovering and purifying the hydrocarbon wastegas by condensation and adsorption has the characteristics of high recovery of hydrocarbon substances, high regeneration efficiency of the activated carbon, high concentration and convenient use of the regenerative gas, and the like, and can be applied to recovery and purification treatment of acid tank exhaust gas, oxidative sweetening tail gas and other hydrocarbon wastegas.

Description

technical field [0001] The invention relates to a method for condensation-adsorption recovery and purification of waste gas containing hydrocarbons, in particular to a recovery treatment method for oxidative sweetening tail gas of light hydrocarbons, waste gas discharged from acidic water tank farms, and the like. Background technique [0002] The mercaptan content of light hydrocarbons is one of the important quality indicators, such as liquid hydrocarbons, gasoline, kerosene, etc. The light hydrocarbons produced by many processes contain a certain amount of mercaptans, so appropriate methods are required to remove them. The hydrogenation process can be used for sweetening light hydrocarbons, but the hydrogenation method device is complicated, the investment is large, the operating cost is high, and some indicators of light hydrocarbons (such as the octane number of gasoline) are affected, such as the gasoline disclosed in CN1478866A Desulfurization methods, etc. Oxidativ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D5/00B01D53/04
Inventor 刘忠生郭兵兵方向晨王海波齐慧敏朴勇
Owner CHINA PETROLEUM & CHEM CORP
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