公开(公告)号：US20200176793A1

公开(公告)日：2020-06-04

申请号：US16695335

申请日：2019-11-26

Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY ,  FUELCELL ENERGY, INC.

Inventor： Timothy A. Barckholtz ,  Jonathan Rosen ,  Carla S. Pereira ,  Rodrigo F. Blanco Gutierrez ,  Frank Hershkowitz ,  Carl A. Willman ,  Timothy C. Geary

IPC: H01M8/04537 ,  H01M8/0438 ,  H01M8/14

Abstract: Systems and methods are provided for operating molten carbonate fuel cells to allow for periodic regeneration of the fuel cells while performing elevated CO2 capture. In some aspects, periodic regeneration can be achieved by shifting the location within the fuel cells where the highest density of alternative ion transport is occurring. Such a shift can result in a new location having a highest density of alternative ion transport, while the previous location can primarily transport carbonate ions. Additionally or alternately, periodic regeneration can be performed by modifying the input flows to the fuel cell and/or relaxing the operating conditions of the fuel cell to reduce or minimize the amount of alternative ion transport.

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.

公开(公告)号：US20200176799A1

公开(公告)日：2020-06-04

申请号：US16695286

申请日：2019-11-26

Applicant: EXXONMOBIL RESEARCH AND ENGINEERING COMPANY ,  FUELCELL ENERGY, INC.

Inventor： Rodrigo F. Blanco Gutierrez ,  Eric B. Shen ,  Carla S. Pereira ,  Keith E. Davis ,  Hossein Ghezel-Ayagh

IPC: H01M8/14

Abstract: Systems and methods are provided for using fuel cell staging to reduce or minimize variations in current density when operating molten carbonate fuel cells with elevated CO2 utilization. The fuel cell staging can mitigate the amount of alternative ion transport that occurs when operating molten carbonate fuel cells under conditions for elevated CO2 utilization.

公开(公告)号：US20180229180A1

公开(公告)日：2018-08-16

申请号：US15955182

申请日：2018-04-17

Applicant: ExxonMobil Research and Engineering Company ,  BASF

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

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

CPC classification number: B01D53/1493 ,  B01D53/1425 ,  B01D53/1468 ,  B01D53/18 ,  B01D2252/204 ,  B01D2252/20431 ,  B01D2252/20478 ,  B01D2252/20489 ,  B01D2257/304 ,  B01D2257/504 ,  C10L3/10 ,  C10L3/103 ,  C10L2290/542 ,  Y02C10/06

Abstract: A process for selectively separating H2S from a gas mixture which also comprises CO2 is 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.