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Device and method for separating light hydrocarbons from oil gas through low-pressure desulfurization
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A technology for oil, gas and light hydrocarbons, which is applied in separation methods, dispersed particle separation, distillation purification/separation, etc. It can solve the problems of large heat load of reboiler at the bottom of the tower, increased investment and energy consumption, long process flow, etc., and achieves reduction The effect of less energy consumption and cooling capacity consumption and simple process
Active Publication Date: 2020-12-29
SINOPEC ENG +1
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[0005] (2) The absorption and stabilization system uses stable gasoline as an absorbent to recover liquefied gas components. Due to the high yield of liquefied gas components in the catalytic cracking process, gasoline is Gasoline absorbing tower, ethane deabsorbing tower and stabilizing tower are circulated, and the circulation volume is large, the temperature at the bottom of ethane desorbing tower and stabilizing tower is high, the heat load of reboiler at the bottom of the tower is relatively large, and the energy consumption is low high
[0006]
(3) The entire technological process is relatively long, which increases investment and energy consumption accordingly
[0007]
(4) The existing process desulfurizes and sweetens the dry gas and liquefied gas after absorption and stabilization, H
2
S and mercaptans circulate in the entire absorption stabilization system, which may cause related corrosion problems, and there is H in the entire absorption stabilization system.
2
Possible security issues caused by S leakage
Method used
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Embodiment 1
[0073] Oil and gas low-pressure desulfurization and separation of light hydrocarbons:
[0074] Oil and gas feed pipeline, gas-liquid separation tank 1, first stage of compressor I 2, second stage of compressor I 3, debutanizer 4, rich gas desulfurization tower 5, rich gas alkali washing tower 6, liquid hydrocarbon desulfurization tower 7, liquid Hydrocarbonsweetening reactor 8, compressor II 9, cooler 10, aftercooler 11, feed tank 12, absorption tower 13, demethanizer 14, depropanizer 15, deethanizer 16, impuritytreatment unit 17, Propylene rectification 18, absorbent recovery tower 19 and drying unit 20;
[0075] Wherein, the oil-gas feed pipeline is connected with the inlet of the gas-liquid separation tank 1, and the tank top of the gas-liquid separation tank 1 is connected with the compressor 1, the first section 2 of the compressor I, the second section 3 of the compressor I, and the debutanizer 4 in turn, and the bottom of the tank is Connected with debutanizer 4; Com...
Embodiment 2
[0107] Oil and gas low-pressure desulfurization and separation of light hydrocarbons:
[0108] Oil and gas feed pipeline, gas-liquid separation tank 1, first stage of compressor I 2, second stage of compressor I 3, debutanizer 4, rich gas desulfurization tower 5, rich gas alkali washing tower 6, liquid hydrocarbon desulfurization tower 7, liquid Hydrocarbonsweetening reactor 8, compressor II 9, cooler 10, aftercooler 11, feed tank 12, absorption tower 13, demethanizer 14, depropanizer 15, deethanizer 16, impuritytreatment unit 17, Propylene rectification 18, absorbent recovery tower 19 and drying unit 20;
[0109] Wherein, the oil and gas feed pipeline is connected with the inlet of the gas-liquid separation tank 1, and the top of the gas-liquid separation tank 1 is connected with the compressor 1, the first section 2 of the compressor I, the second section 3 of the compressor I, and the debutanizer 4 in turn, and the bottom of the tank is Connected with debutanizer 4; Comp...
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Abstract
The invention belongs to the field of chemical engineering, and particularly discloses a device and method for separating light hydrocarbons from oil gas through low-pressure desulfurization. The method has the advantages of simple process, mild operating conditions and low cold consumption, can realize separation and recovery of the light hydrocarbons in the oil gas by using less equipment, and especially can realize high-efficiency separation and recovery of C2, C3 and C4 components. Moreover, a gas phase and a liquid phase are adopted for desulfurization and sweetening respectively, and thecontent of heavy hydrocarbons in the gas phase is reduced, so that the heavy hydrocarbons can be prevented from being condensed into an amine liquid, foam entrainment of a desulfurization device dueto foaming of the amine liquid can be effectively avoided, and stable operation of the device is ensured.
Description
technical field [0001] The invention belongs to the field of oil refining and chemical industry, and more specifically relates to a device and method for oil and gas low-pressure desulfurization and separation of light hydrocarbons, and more specifically relates to oil and gas in processes with high gas yields such as catalytic cracking, catalytic cracking, and delayed coking. A device and method for low-pressure desulfurization and separation of light hydrocarbons. Background technique [0002] Light hydrocarbons refer to components such as methane, ethane, ethylene, propane, propylene, and C4 obtained from petrochemical processes. The separation process of light hydrocarbons has always been the focus of petrochemical processes. Among them, the separation process between carbon 2, carbon 3 and carbon 4 is relatively mature, and rectification is usually used. Due to the low boiling point of methane, if distillation is used to separate methane and carbon dioxide, it needs to...
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