Method and device for recovering oil and gas

Abstract

The invention belongs to the field of chemical industry, and specifically discloses a method and device for recovering oil and gas. The method has simple process flow, moderate operating conditions, less cooling capacity consumption, and can realize the recovery of light and heavy gasoline, carbon two, carbon three and Efficient separation and recovery of carbon four components, especially the efficient separation and recovery of carbon two, carbon three and carbon four components, and the recovered carbon two products basically do not contain propylene, which can be sent downstream to directly produce ethylbenzene / styrene; and the present invention adopts gas phase and liquid phase to desulfurize and desulfurize respectively, the gas phase desulfurizes and desulfurizes under high pressure, the equipment volume is small, the investment is low, and the desulfurization effect is good; at the same time, the heavy hydrocarbon content in the gas phase The reduction can prevent heavy hydrocarbons from condensing into the amine liquid, and can effectively avoid the foam entrainment of the desulfurization device caused by the foaming of the amine liquid, ensuring the smooth operation of the device.

Description

technical field [0001] The invention belongs to the field of oil refining and chemical industry, more particularly, relates to a method and device for recovering oil and gas, and more particularly relates to a device for recovering oil and gas in processes with high gas yields such as catalytic cracking, catalytic cracking and delayed coking, and the like. method. Background technique [0002] Light hydrocarbons refer to the components obtained from petrochemical processes such as methane, ethane, ethylene, propane, propylene, and C4. The separation process of light hydrocarbons has always been the focus of petrochemical processes. Among them, the separation process between carbon two, carbon three and carbon four is relatively mature, and the method of rectification is usually used. Due to its low boiling point, methane needs to be cooled to -100°C and lower if the rectification method is used to separate methane and carbon dioxide, that is, cryogenic separation, which is ...

AI Technical Summary

Problems solved by technology

[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) When the recovered C2 product is sent to the separation unit of the ethylene plant, some of the heavy components such as propylene contained in the C2 product can be recovered through the ethylene separation unit; but when the recovered C2 product is sent to the downstream production of ethylbenzene , the propylene component contained in it will bring many adverse effects to the production of ethylbenzene, which will not only greatly increase the consumption of benzene, but also directly affect the quality of ethylbenzene and styrene products

Due to the low boiling point of the carbon 2 component, the separation of the carbon 2 and carbon 3 components usually requires a temperature of -5 to -20°C. For this reason, dehydration and CO removal are required 2 processing, and requires a lower temperature grade of refrigerant, the investment and energy consumption are large

[0008] (5) 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

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