Conversion of FS smoke agent (a mixture of sulfur trioxide and chlorosulfonic acid) to sulfamic acid and ammonium chloride

• US 4,490,345 A
• Filed: 03/05/1984
• Issued: 12/25/1984
• Est. Priority Date: 03/05/1984
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Kwak, Solim S. W.
• Primary Examiner(s): Doll, John
• Assistant Examiner(s): Langel, Wayne A.
• Application Number:
  US06/586,155
• Time in Patent Office: 295 Days
• Field of Search: 423/389, 423/470
• US Class Current: 423/389
• CPC Class Codes: C01B 21/096 Amidosulfonic acid; Salts thereof
• CPC Class Codes: C01C 1/164 Ammonium chloride

Abstract

The process of converting FS smoke agent (a mixture of sulfur trioxide andhlorosulfonic acid) to sulfamic acid and ammonium chloride comprising the steps of dissolving the FS smoke agent in an organic solvent solution to obtain a solvation product, subjecting the solvation product to ammonia gas to obtain a sulfamic acid ammonium chloride mix, and separating and purifying the mix into sulfamic acid and ammonium chloride.

Claims

1. The process of converting FS smoke agent (a mixture of sulfur trioxide and chlorosulfonic acid) to sulfamic acid and ammonium chloride comprising the steps of:

a. dissolving FS smoke agent into an organic solvent solution to obtain a solvation product,

b. subjecting said solvation product with ammonia gas to obtain a sulfamic acid and ammonium chloride mix,

c. separating and purifying said mix into sulfamic acid and ammonium chloride.

2. The process as set forth in claim 1 wherein said solvation product is a termally stable intermediate composition which remains dissolved in said solvent solution.

3. The process as set forth in claim 1 wherein the solvent solution is one from a class consisting of:

1,2-dichloroethane,

1,1-dichloroethane,

1,1,2,2-tetrachloroethane,

Dichloromethane,

Carbontetrachloride,

Pyridine,

Dimethylsulfoxide,

Hexane, and

Toluene.

4. The process as set forth in claim 1 wherein the solvent solution is pyridine.

5. The process as set forth in claim 1 wherein said FS smoke agent is added while said solvent is continuously stirred until the resultant solvation product is a yellow liquid.

6. The process as set forth in claim 1 wherein said ammonia gas is added while the resultant white participate is continually removed from said solvation product.

7. The process as set forth in claim 1 wherein said mix is separated and purified by recrystallization techniques.

8. The process as set forth in claim 1 wherein said mix is filtered and the liquid removed therefrom and reused in subsequent solvation of additional FS smoke agent.