US 11,655,423 B2
Process for separating alkylation product, alkylation reaction and separation process, and related apparatus
Qing Yuan, Beijing (CN); Junyi Mao, Beijing (CN); Zhenxing Zhu, Beijing (CN); Tao Huang, Beijing (CN); Zhihai Zhao, Beijing (CN); Yongxiang Li, Beijing (CN); Lifeng Hu, Beijing (CN); and Xiaojin Tang, Beijing (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and RESEARCH INSTITUTE OF PETROLEUM PROCESSING, SINOPEC, Beijing (CN)
Appl. No. 17/274,342
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and RESEARCH INSTITUTE OF PETROLEUM PROCESSING, SINOPEC, Beijing (CN)
PCT Filed Sep. 6, 2019, PCT No. PCT/CN2019/104644
§ 371(c)(1), (2) Date Mar. 8, 2021,
PCT Pub. No. WO2020/048521, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. CN201811039335 (CN), filed on Sep. 6, 2018.
Prior Publication US 2021/0324274 A1, Oct. 21, 2021
Int. Cl. C10G 7/00 (2006.01); B01D 3/06 (2006.01); B01D 3/00 (2006.01); B01D 3/14 (2006.01); B01D 3/32 (2006.01); B01D 5/00 (2006.01); C07C 2/86 (2006.01); C07C 7/04 (2006.01); C10G 57/00 (2006.01)
CPC C10G 7/00 (2013.01) [B01D 3/007 (2013.01); B01D 3/06 (2013.01); B01D 3/143 (2013.01); B01D 3/322 (2013.01); B01D 5/0063 (2013.01); B01D 5/0075 (2013.01); C07C 2/865 (2013.01); C07C 7/04 (2013.01); C10G 57/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A process for separating an alkylation product, comprising:
introducing a liquid phase alkylation product from an alkylation reaction unit into a first heat-exchanger as a cold stream to exchange heat with a vapor phase stream from a column top of a high-pressure fractionating column, wherein the liquid phase alkylation product is pressurized using a pressure pump or not pressurized;
introducing the liquid phase alkylation product exiting from the first heat-exchanger into a second heat-exchanger as a cold stream;
heating the liquid phase alkylation product in the second heat-exchanger and further heated to 100° C.;
introducing the liquid phase alkylation product exiting from the second heat-exchanger into the high-pressure fractionating column for fractionation under a condition of 2.0 MPa-6.0 MPa;
introducing the vapor phase stream from the column top of the high-pressure fractionating column into the first heat-exchanger as a hot stream;
introducing a liquid phase stream from a column bottom of the high-pressure fractionating column into a low-pressure fractionating column for fractionation under a condition of 0.2 MPa-1.0 MPa,
obtaining a low-carbon alkane from the column top of the low-pressure fractionating column, and a liquid phase stream from the column bottom of the low-pressure fractionating column as an alkylation oil product, and
heating a material stream from the low-pressure fractionating column as a cold stream in an inter-reboiler using at least a part of the vapor phase stream from the column top of the high-pressure fractionating column exiting from first heat-exchanger as a hot stream; and
feeding the heated material stream from the inter-reboiler to the low-pressure fractionating column.