James T Schultz

US Patent:

6437159, Aug 20, 2002

Filed:

Jul 31, 2001

Appl. No.:

09/682172

Inventors:

James Arnold Schultz - Swedesboro NJ

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C11B 800

US Classification:

554188, 554226, 554187, 562605

Abstract:

A process that can be used for isolating a fluorinated alkanoic acid from an aqueous solution also containing inorganic fluorides is provided. This process comprises (A) acidifying an aqueous solution comprising an ammonium or metal salt of a fluorinated alkanoic acid to produce an acidified solution, (B) heating the acidified solution to produce an organic layer and an aqueous layer, (C) separating and recovering the organic layer from the aqueous layer, (D) optionally washing the organic layer with an acid solution, (E) optionally isolating the fluorinated alkanoic acid, and (F) further optionally converting the fluorinated alkanoic acid to its ammonium or alkali metal salt.

US Patent:

6765112, Jul 20, 2004

Filed:

Mar 25, 2003

Appl. No.:

10/396942

Inventors:

James A. Schultz - Woolwich Township NJ

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C07C30900

US Classification:

562115, 562113, 562114

Abstract:

A process that can be used for manufacturing a tetraalkylonium perfluoroalkylsulfonate is provided. The process comprises contacting a tetraalkylonium halide with a metal perfluoroalkyl sulfonate to produce a mixture; allowing the second mixture to produce an aqueous upper layer and a separate lower liquid layer; separating the lower liquid layer from the upper aqueous layers to produce a product layer; optionally washing the product layer with 1 to 10 volumes of water, based on the volume of the product layer at a temperature of about 50Â C. to about 100Â C. to produce a washed product layer; and drying the product layer or washed product.

US Patent:

62813749, Aug 28, 2001

Filed:

Aug 23, 2000

Appl. No.:

9/644165

Inventors:

James Arnold Schultz - Swedesboro NJ

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C07C 5300

US Classification:

554226

Abstract:

A process that can be used for isolating a fluorinated alkanoic acid from an aqueous solution also containing inorganic fluorides is provided. This process comprises (A) acidifying an aqueous solution comprising an ammonium salt of a fluorinated alkanoic acid to produce an acidified solution, (B) heating the acidified solution to produce an organic layer and an aqueous layer, (C) separating and recovering the organic layer from the aqueous layer, (D) optionally washing the organic layer with an acid solution, (E) optionally isolating the fluorinated alkanoic acid, and (F) further optionally converting the fluorinated alkanoic acid to its ammonium salt.