US 11,946,002 B2Granted

Method and device for treating oil gas

AssigneesSinopec Engineering Incorporation, Sinopec Engineering (Group) Co., Ltd.

InventorsMengqi Huang, Longhong Yu, Lei Wu, Shengyang Jiang, Yuwen Ding, Na Gao, Di Wu, Dan Duan

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Abstract

Provided is a method for treating an oil gas, which can realize high-efficiency separation for and recovery of gasoline components, C2, C3, and C4 components. The method first conducts separation of light hydrocarbon components from gasoline components, and then performs subsequent treatment on a stream rich in the light hydrocarbon components, during which it is no longer necessary to use gasoline to circularly absorb liquefied gas components, which significantly reduces the amount of gasoline to be circulated and reduces energy consumption throughout the separation process. Besides, in this method, impurities, such as H2S and mercaptans, in the stream rich in the light hydrocarbon components are removed first before the separation for the components. This ensures that impurities will not be carried to a downstream light hydrocarbon recovery section, thus avoiding corrosion issues caused by hydrogen sulfide in the light hydrocarbon recovery section.

Claims13

Dependent claims

A method for treating an oil gas, comprising the following steps:

(1) subjecting a hydrocarbon material to a first gas-liquid separation to obtain a first gas-phase material mainly containing H2 and C1-C4 and a first liquid-phase material mainly containing C5+;
and
(2) subjecting the first gas-phase material to impurity removal to obtain an impurity-removed first gas-phase material, subjecting the impurity-removed first gas-phase material to a second gas-liquid separation to obtain a second gas-phase material mainly containing H2 and C1-C2 and a second liquid-phase material mainly containing C3-C4;
subjecting the second gas-phase material to gas phase impurity removal to obtain an impurity-removed second gas-phase material, and subjecting the second liquid-phase material to liquid phase impurity removal to obtain an impurity-removed second liquid-phase material;
the impurity-removed second gas-phase material and the impurity-removed second liquid-phase material being mixed and then subjected to a separation treatment to obtain a dry gas product mainly containing H2 and C1, a C2 product mainly containing C2, a C3 product mainly containing C3, and a C4 product mainly containing C4.

2 more elements

Dependencies are inferred from the claim text.