Alan D Singleton

US Patent:

RE294284, Oct 4, 1977

Filed:

Nov 10, 1975

Appl. No.:

5/630566

Inventors:

Otto A. Homberg - Easton PA
Charles W. Sheldrake - Bethlehem PA
Alan H. Singleton - Baden PA

Assignee:

Bethlehem Steel Corporation - Bethlehem PA

International Classification:

B01D 5334

US Classification:

423228

Abstract:

A catalytic amount of ammonia or ammonium compounds are utilized to prevent deterioration of alkanolamines employed in gas sweetening processes. The ammonia is added either to the sour gas or the absorbing solution and acts to suppress thiocyanate. [. formation. ]. . Iadd. accumulation. Iaddend. during absorption. BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to gas purification and more particularly to gas purification by the removal of acid gases from industrial gas in an absorption/desorption process. 2. Prior Art The term "gas sweetening" pertains to gas purification processes in which acid gases, particularly sulfurous gases are removed from industrial gases. Gas sweetening processes commonly utilize aqueous absorbing solutions into which the acid gases are scrubbed (absorbed) to be later stripped (desorbed) for possible further treatment. Desorbing is accomplished by heating the spent solution to expel the acid gases.

US Patent:

39593428, May 25, 1976

Filed:

Dec 10, 1974

Appl. No.:

5/531273

Inventors:

Otto A. Homberg - Easton PA
Alan H. Singleton - Emmaus PA

Assignee:

Bethlehem Steel Corporation - Bethlehem PA

International Classification:

C07C12000

US Classification:

2604655A

Abstract:

Nitrilotriacetonitrile (NTN) is produced in high yeilds from hydrogen cyanide, formaldehyde and ammonia, or its equivalent as an ammonium salt of a strong acid, by utilization of a critical two-stage reaction sequence within a narrow dilution ratio and temperature range. The reaction sequence steps provide for a first mixture to be prepared comprising a mixture of the formaldehyde and ammonia. No external adjustment of the pH of this mixture is permitted. A second mixture is prepared comprised of the HCN in an aqueous solution and a strong mineral acid such as sulfuric acid for adjusting the pH of the mixture to about 1 or less. NTN is produced by combining the mixtures at a temperature of from about 55. degree. C. to about 70. degree. C. either by adding the formaldehyde/ammonia solution to the HCN/acid solution or vice versa.