公开(公告)号：US20220126235A1

公开(公告)日：2022-04-28

申请号：US17537654

申请日：2021-11-30

Applicant: ExxonMobil Research and Engineering Company ,  BASF

Inventor： Carla S. Pereira ,  Michael Siskin ,  Thomas Ingram ,  Gerald Vorberg ,  Martin Ernst

IPC: B01D53/14 ,  C10L3/10 ,  B01D53/18

Abstract: A process for selectively separating H2S from a gas mixture which also comprises CO2is disclosed. A stream of the gas mixture is contacted with an absorbent solution comprising one or more amines, alkanolamines, hindered alkanolamines, capped alkanolamines, or mixtures thereof. The H2S/CO2 selectivity of the absorbent solution is preferably greater than about 4.0 for an acid gas loading [mol(CO2+H2S)/mol(amine)] between about 0.2 and about 0.6, and is achieved by reducing pH of the absorbent solution.

公开(公告)号：US10155192B2

公开(公告)日：2018-12-18

申请号：US15169835

申请日：2016-06-01

Applicant: ExxonMobil Research and Engineering Company

Inventor： Carla S. Pereira ,  Michael Siskin ,  Himanshu Gupta

IPC: B01D53/52 ,  B01D53/14 ,  B01D53/78 ,  B01D53/96 ,  B01D53/18 ,  C10L3/10

Abstract: A system and process for selectively separating H2S from a gas mixture which also comprises CO2 is disclosed. A water recycle stream is fed to the absorber in order to create a higher concentration absorbent above the recycle feed and having a greater H2S selectivity at lower acid gas loadings, and a more dilute absorbent below the recycle feed and having a greater H2S selectivity at higher acid gas loadings. Also disclosed is a system and process for selectively separating H2S by utilizing two different absorbents, one absorbent for the upper section of the absorber, tailored to have a greater H2S selectivity at lower acid gas loadings, and a second absorbent for the lower section of the absorber, tailored to have a greater H2S selectivity at higher acid gas loadings.