Fude (Beijing) Chemical & Industry Co., Ltd.

Daqing Petrochemical Engineering Co., Ltd.

Fude Chemical & Industry Co., Ltd

Xiangqian Huang

Longwu Cheng

Xiaobo Wei

Fengtang Fan

Yingxin Wu

The provided is a process for separating by absorption the pyrolysis gas from preparation of lower carbon olefins, wherein a primary absorbent and a secondary absorbent are introduced into the demethanizer to separate by absorption the feedstock of the demethanizer through countercurrent contact therewith at a moderate temperature and pressure, thereby to obtain a top fraction primarily comprising hydrogen and methane and a bottom fraction primarily comprising the absorbents and C2+ fraction, wherein the primary absorbent essentially is a mixed Cn or Cn+ fraction, the secondary absorbent essentially is a Cn' alkane fraction or mixed Cn&#x2032; or Cn&#x2032;+ fraction, and wherein n and n&#x2032; are independently 3, 4 or 5 with the proviso when the secondary absorbent is a mixed fraction, n&#x2032; is not 3.

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Heilongjiang, China

Xiangqian Huang