Method for processing light hydrocarbons oxidation sweetening tail gas

A technology for oxidative sweetening of mercaptans and light hydrocarbons, applied in chemical instruments and methods, separation methods, steam condensation, etc., can solve problems such as economic decline and increase in operating costs, and achieve high total recovery rate, improved recovery rate, achieve maximum effect

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Maximizing the recovery of hydrocarbons in the tail gas can increase the income, but generally speaking, when the recovery rate of hydrocarbons reaches a certain limit, the operating costs required to further increase the recovery rate will increase greatly, so the overall economy will decline; if Integrating the requirements of meeting emission standards, how to determine the treatment method and control conditions of oxidative sweetening tail gas to ensure the maximum economy under the premise of meeting the emission standards is the key research of the oxidative sweetening tail gas treatment method.

Method used

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  • Method for processing light hydrocarbons oxidation sweetening tail gas
  • Method for processing light hydrocarbons oxidation sweetening tail gas

Examples

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Effect test

Embodiment 1

[0023] The tail gas of a certain company's gasoline air oxidation desulphurization, containing 32v% of hydrocarbons, the exhaust temperature is 53°C, the oxygen content is 17v%, and the average ambient temperature is 25°C. Firstly, the tail gas is compressed to 6.0MPa in stages, cooled with circulating cooling water between stages, and the temperature of the last stage is cooled to 40°C, and the condensed hydrocarbons are recovered. The hydrocarbon content of the compressed and condensed tail gas is 7.5v%. After compression and condensation, the exhaust gas is subjected to pressure swing adsorption with two towers of activated carbon, and the volumetric space velocity of the pressure swing adsorption bed is 5000h -1 When the exhaust gas from the adsorption process reaches 7000μL / L, it switches to regeneration operation, the concentrated gas is decompressed and condensed, and the total hydrocarbon recovery rate is above 95v%. The pressure swing adsorption exhaust gas is purified by...

Embodiment 2

[0025] The tail gas of a certain enterprise gasoline air oxidation desulphurization, containing 32v% of hydrocarbons, the exhaust temperature is 53°C, the oxygen content is 16v%, and the average ambient temperature is 25°C. Firstly, the tail gas is compressed to 6.0MPa in stages, cooled with circulating cooling water between stages, and the temperature of the last stage is cooled to 40°C, and the condensed hydrocarbons are recovered. The hydrocarbon content of the compressed and condensed tail gas is 8.5v%. After compression and condensation, the exhaust gas is subjected to pressure swing adsorption with three towers of activated carbon, and the volumetric space velocity of the pressure swing adsorption bed is 800h -1When the exhaust gas from the adsorption process reaches 8000μL / L, it is switched to regeneration operation. The concentrated gas is removed from the gas pipe network. After compression cooling and pressure swing adsorption, the total hydrocarbon recovery rate is abov...

Embodiment 3

[0027] Gasoline oxidative desulfurization tail gas of a certain enterprise contains 25v% hydrocarbons, the temperature of the tail gas is 45°C, the oxygen content is 7v%, and the average ambient temperature is -10°C. The tail gas is first compressed to 0.8MPa, and then cooled to 10°C with the company's circulating cooling water and cold air, and the condensed hydrocarbons are recovered. The hydrocarbon content of the compressed and condensed tail gas is 6.2v%. After compression and condensation, the tail gas is subjected to pressure swing adsorption with two towers of activated carbon, and the volumetric space velocity of the pressure swing adsorption bed is 9000h -1 When the total hydrocarbon concentration of the exhaust gas reaches 4500μL / L, it is switched to regeneration operation. The concentrated gas is decompressed and condensed. After compression cooling and pressure swing adsorption, the total hydrocarbon recovery rate is more than 95v%. The pressure swing adsorption exhau...

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Abstract

The invention relates to a method for processing the oxidization desulfuration tail gas of hydrocarbons. Wherein, it compresses the tail gas; uses circulate cooling water to reduce the temperature; and recycles the condensed hydrocarbons; the discharge gas is absorbed; the concentrated gas is circulated to the compression and condensation or discharge into gas tube; the discharges gas can be discharged directly or burnt. The invention has high recycle rate and low cost.

Description

Technical field [0001] The invention relates to a method for treating hydrocarbon-containing waste gas, in particular to a method for treating tail gas from the oxidation and sweetening of light hydrocarbons. 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 certain removal treatment is required. The hydrogenation process can be used for the sweetening of light hydrocarbons, but the hydrogenation process has complex equipment, large investment, and high operating costs. Some indicators of light hydrocarbons (such as the octane number of gasoline) are affected, such as the gasoline disclosed by CN1478866A Desulfurization methods, etc. Oxidative desulfurization is an important method for desulfurization of light hydrocarbons, that is, under certain conditions, the mercap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D5/00B01D53/047B01D53/86B01D53/72
Inventor 刘忠生方向晨王海波杨英
Owner CHINA PETROLEUM & CHEM CORP
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