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Method for processing light hydrocarbon 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 increased operating costs, difficult to meet emission standards, and industrial application restrictions, and achieves easy operation and automatic control The effect of high degree, low equipment investment and operation cost

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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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.
Although the existing various hydrocarbon recovery technologies can be used for the recovery and treatment of oxidative sweetening tail gas, such as deep condensation recovery, adsorption recovery, membrane recovery, etc., the comprehensive economic efficiency is poor, and it is difficult to meet the discharge standards, which has great influence on industrial applications. limit

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  • Method for processing light hydrocarbon oxidation sweetening tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Gasoline air oxidation sweetening tail gas of an enterprise contains 32v% hydrocarbons, the tail gas temperature is 53°C, and the oxygen content is 17v%. First compress the tail gas to 2.0MPa, then use the enterprise's circulating cooling water to cool down to 40°C, and recover condensed hydrocarbons, then condense and cool the tail gas to -10°C, single-stage compression refrigeration, recover oily condensate, and condensate The hydrocarbon content of the tail gas is 8.9v%, and the hydrocarbon recovery rate is over 60v%. After exchanging heat between the condensed tail gas and the pre-condensed gas, use air to adjust the total hydrocarbon concentration to 3000-8000 μL / L (calculated as methane), and use regenerative combustion to purify the gas. The total hydrocarbon concentration of the purified gas is less than 120 μL / L (calculated as methane). In line with national emission standards. The regenerative combustion adopts the operation mode shown in Figure 3. The regene...

Embodiment 2

[0024] Gasoline sweetening tail gas by air oxidation in a certain enterprise contains 25v% hydrocarbons, the tail gas temperature is 45°C, and the oxygen content is 16v%. First compress the exhaust gas to 0.8MPa, then use the enterprise's circulating cooling water to cool down to 40°C, and recover condensed hydrocarbons, then condense and cool the tail gas to -40°C, use two-stage compression refrigeration, recover oily condensate, and condensate The tail gas hydrocarbon content is 4.1v%, and the hydrocarbon recovery rate is over 80v%. After exchanging heat between the condensed tail gas and the pre-condensed gas, use air to adjust the total hydrocarbon concentration to 3000-8000 μL / L (calculated as methane), and use catalytic combustion to purify it. National emission standards. Catalytic combustion adopts the operation mode shown in Figure 2. The catalytic combustion catalyst is a honeycomb catalyst containing Pt0.26wt% and Pd0.13wt%. -1 .

Embodiment 3

[0026] Gasoline air oxidation sweetening tail gas of an enterprise contains 30v% hydrocarbons, tail gas temperature is 50°C, and oxygen content is 17v%. First compress the tail gas to 1.2MPa, then use the enterprise's circulating cooling water to cool down to 42°C, and recover condensed hydrocarbons, then condense and cool the tail gas to -35°C, use two-stage compression refrigeration, recover oily condensate, and condensate The tail gas hydrocarbon content is 3.2v%, and the hydrocarbon recovery rate is over 85v%. After exchanging heat between the condensed tail gas and the pre-condensed gas, use air to adjust the total hydrocarbon concentration to 3000-8000 μL / L (calculated as methane), and use catalytic combustion to purify it. National emission standards. The catalytic combustion adopts the operation mode shown in Figure 2. The catalytic combustion catalyst is a spherical alumina carrier catalyst with a diameter of 4mm containing Pt0.05wt% and Pd0.02wt%. -1 .

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Abstract

The invention relates to a method for processing the oxidization desulfuration tail gas of hydrocarbons. Wherein, it compresses, condenses, and recycles the hydrocarbons; the non-condensed gas via catalyst is burnt to be purified and discharged. The invention has high recycle rate and low cost.

Description

technical field [0001] The invention relates to a treatment method for hydrocarbon-containing waste gas, in particular to a treatment method for oxidative sweetening tail gas 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 treatments are required. 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. Oxidative desulfurization is an important method for desulfurization of light hydrocarbons, that is, under certain conditions, the mer...

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 刘忠生王海波方向晨杨英赵威
Owner CHINA PETROLEUM & CHEM CORP
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