Patent ID: 11946002
Assignee: SINOPEC ENGINEERING INCORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 4:
5. The method for treating an oil gas according to claim 1, wherein in step (2), the separation treatment specifically comprises the following steps:
(a) cooling an impurity-removed first gas-phase material or a mixture material of an impurity-removed second gas-phase material and an impurity-removed second liquid-phase material, and then subjecting the cooled impurity-removed first gas-phase material or the cooled mixture material of the impurity-removed second gas-phase material and the impurity-removed second liquid-phase material to first separation, to obtain a gas-phase material mainly containing H2 and C1 and a liquid-phase material mainly containing C1-C4;
(b) subjecting the liquid-phase material mainly containing C1-C4 to second separation to obtain a gas-phase material mainly containing C1 and a liquid-phase material mainly containing C2-C4;
(c) subjecting the liquid-phase material mainly containing C2-C4 to third separation to obtain the C2 product mainly containing C2 and a liquid-phase material mainly containing C3-C4 or obtain the C3 product mainly containing C3 and a liquid-phase material mainly containing C2 and C4;
(d) subjecting the liquid-phase material mainly containing C3-C4 or the liquid-phase material mainly containing C2 and C4 to fourth separation to obtain the C4 product mainly containing C4 and the C3 product mainly containing C3 or the C2 product mainly containing C2; and
(e) subjecting the C3 product to rectification to obtain a propane product mainly containing propane and a propylene product mainly containing propylene.