Jagannathan N Iyengar

US Patent:

7662215, Feb 16, 2010

Filed:

Jun 20, 2005

Appl. No.:

11/628826

Inventors:

Christopher W. Sparling - The Woodlands TX, US
P. Scott Northrop - Spring TX, US
Johnny E. Johnson - Denver CO, US
Jagannathan N. Iyengar - Centreville VA, US
Barry M. Friedman - Denver CO, US

Assignee:

ExxonMobil Upstream Research Company - Houston TX

International Classification:

B01D 53/14

US Classification:

95172, 95235, 95236, 423220, 423570

Abstract:

A method for removing sulfur-containing compounds is provided. In one embodiment, the method includes selectively separating a feed stream () comprising carbon dioxide and one or more sulfur-containing compounds, including hydrogen sulfide, at conditions sufficient to produce a first stream () comprising carbon dioxide and hydrogen sulfide and a second stream () comprising carbon dioxide and hydrogen sulfide. A molar ratio of carbon dioxide to hydrogen sulfide in the first stream is greater than a molar ratio of carbon dioxide to hydrogen sulfide in the second stream, and a molar ratio of hydrogen sulfide in the first stream to hydrogen sulfide in the second stream is about 0. 005 or more.

US Patent:

8524184, Sep 3, 2013

Filed:

Jun 29, 2010

Appl. No.:

12/825865

Inventors:

Jagannathan N. Iyengar - Centreville VA, US
David Perry - Alexandria VA, US
Robert B. Fedich - Long Valley NJ, US

Assignee:

ExxonMobil Research and Engineering Company - Annandale NJ

International Classification:

B01D 53/50
B01D 53/52

US Classification:

423228, 4232424, 4232427

Abstract:

A process for the removal of hydrogen sulfide from a gas stream in which the gas stream is first passed through a Claus unit operating at a sub-stoichiometric ratio (HS:SO) of greater than 2:1 to produce a tail gas stream comprising less than 2000 vppm SO. This tail gas stream is then treated to increase the sulfur recovery to at least 99. 5% by first directly cooling the tail gas stream by contact with water as a coolant, followed by contacting the gas stream with a circulating stream of a dilute, absorbent solution of a severely sterically hindered secondary aminoether alcohol to further cool the gas stream, and then removing the HS from the stream using a stronger absorbent solution of a severely sterically hindered secondary aminoether alcohol.