Absorbent composition containing severely-hindered amine mixture for the absorption of H.sub.2 S

• US 4,894,178 A
• Filed: 10/13/1987
• Issued: 01/16/1990
• Est. Priority Date: 10/13/1987
• Status: Expired due to Fees

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: Sartori, Guido, Ho, W. S. Winston, Stogryn, Eugene L.
• Primary Examiner(s): SCALZO, CATHERINE KILBY
• Application Number:
  US07/106,796
• Time in Patent Office: 826 Days
• Field of Search: 252/189, 252/190, 252/191
• US Class Current: 252/189
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: C07C 217/08 the oxygen atom of the etherified hydroxy group being further bound to an acyclic carbon atom

Abstract

The present invention relates to a mixture of severely-hindered amines, such as bis-(tertiarybutylaminoethoxy)-ethane (BTEE) and ethoxyethoxyethanoltertiarybutylamine (EEETB), and a one-step synthesis method for its preparation. Besides, this invention describes the use of the mixture for the removal of H₂ S, especially the selective removal of H₂ S in the presence of CO₂.

Claims

1. An absorbent composition comprising a mixture of:

(1) a first severely hindered amine with the formula;

##STR3## and (2) a second severely hindered amine with the formula;

##STR4## wherein said first and second severely hindered amines have a cumulative -E_s value greater than 1.75, with x being an integer ranging from 2 to 6 and the weight ratio of the first amine to the second amine ranging from 0.43;

1 to 2.3;

1.

3. The composition of claim 1 wherein said second amine is:

##STR6##

4. The composition of claim 1 wherein said absorbent composition additionally comprises a liquid selected from the group consisting of water, an organic solvent and mixtures thereof.

2. The composition of claim I wherein said first amine is:

##STR5##