Charles F Swain

Author:

Charles Swain

ISBN #:

0841467102

Author:

Charles Swain

ISBN #:

0848220757

Author:

Charles A Swain

ISBN #:

0533131847

US Patent:

6488817, Dec 3, 2002

Filed:

Mar 31, 1998

Appl. No.:

09/052757

Inventors:

Charles Francis Swain - Williamsville NY
Rajiv Ratna Singh - Getzville NY
Hang Thanh Pham - Amherst NY

Assignee:

AlliedSignal Inc. - Morris Township NJ

International Classification:

B01D 336

US Classification:

203 74, 203 75, 203 77, 203 78, 203 80, 203 67, 203DIG 11, 570178

Abstract:

A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated in a first distillate and a majority of the other component is concentrated in a first bottoms; and (b) subjecting the first distillate in step (a) to at least one additional second distillation step conducted at a different pressure in which a majority of the component concentrated in said first distillate is concentrated in a second bottoms and in which the other component is concentrated in a second distillate; and (c) recovering purified HFC-32 from one of said first or second bottoms.

US Patent:

6821436, Nov 23, 2004

Filed:

Mar 3, 2003

Appl. No.:

10/377922

Inventors:

Kane David Cook - Eggertsville NY
Charles Francis Swain - Williamsville NY
Peter Brian Logsdon - Orchard Park NY

Assignee:

Honeywell International Inc. - Morristown NJ

International Classification:

B01D 1500

US Classification:

210690, 95142, 570179

Abstract:

A process for removing a chlorinated methane impurity from a stream comprising a halogenated compound other than the chlorinated methane impurity, the process comprising contacting the stream with a polymer adsorbent to produce a purified product stream, the polymer adsorbent having a pore size distribution characterized by a higher cumulative porosity as a function of the log of pore diameter than that of activated carbon.

US Patent:

20010034465, Oct 25, 2001

Filed:

Mar 6, 2001

Appl. No.:

09/800126

Inventors:

Charles Swain - Williamsville NY, US
Stephen Cottrell - Baton Rouge LA, US
Clifford Riegel - Baton Rouge LA, US
Curtis Brescher - Baton Rouge LA, US

International Classification:

C07C017/093

US Classification:

570/170000

Abstract:

A process for producing a fluorinated organic compound comprising: (a) reacting an organic starting material with a fluorination agent in the presence of a liquid fluorination catalyst under conditions which are effective to vaporize one or more chlorinated organic by-products and to produce a gaseous product stream containing said fluorinated organic compound and said one or more chlorinated organic by-products; and (b) recovering said fluorinated organic compound from said product stream, and a system for performing the aforementioned process and recovering the chlorinated by-product.

US Patent:

61569445, Dec 5, 2000

Filed:

Mar 3, 1998

Appl. No.:

9/034104

Inventors:

Hang T. Pham - Amherst NY
Rajiv R. Singh - Getzille NY
Charles F. Swain - Williamsville NY
Michael Van Der Puy - Amherst NY

Assignee:

Honeywell International Inc. - Morristown NJ

International Classification:

C07C 1738

US Classification:

570177

Abstract:

A process for the separation of mixtures containing halocarbons and hydrogen fluoride. Either water alone or a blend comprising water and hydrogen fluoride is added to a mixture comprising a halocarbon and hydrogen fluoride to thereby form a first phase rich in the halocarbon and a second phase rich in hydrogen fluoride and water. The most preferred halocarbon is 1,1,1,3,3-pentafluoropropane. Preferably, the first and second phases are then separated. Optionally, the second phase rich in hydroger fluoride and water is also separated.

US Patent:

57858225, Jul 28, 1998

Filed:

May 23, 1996

Appl. No.:

8/652891

Inventors:

Gustavo Cerri - Boonton NJ
Kin Ching Kong - Woodside NY
Charles Francis Swain - Williamsville NY
Rajat Subhra Basu - East Amherst NY

Assignee:

AlliedSignal Inc. - Morristown NJ

International Classification:

B01D 334

US Classification:

203 67

Abstract:

The present invention provides a method for separating dichlorodifluoromethane from difluoromethane. More specifically, a process is provided for separating dichlorodifluoromethane and difluoromethane using azeotropic distillation.

US Patent:

55457754, Aug 13, 1996

Filed:

Aug 25, 1995

Appl. No.:

8/519446

Inventors:

Alagappan Thenappan - Cheektowaga NY
Charles F. Swain - Williamsville NY
Matthew H. Luly - Lancaster NY

Assignee:

AlliedSignal Inc. - Morris Township NJ

International Classification:

C07C 17093
C07C 1720
C07C 1908

US Classification:

570168

Abstract:

1,1-difluoroethane is produced by the reaction of 1,2-dichloroethane with anhydrous hydrogen fluoride in a liquid phase and in the presence of a Lewis acid. Preferably the Lewis acid is tin, antimony, titanium, molybdenum, tungsten, niobium or tantalum halide or a mixture thereof.

US Patent:

55457789, Aug 13, 1996

Filed:

May 25, 1994

Appl. No.:

8/248981

Inventors:

Hsueh S. Tung - Getzville NY
Addison M. Smith - Amherst NY
Charles F. Swain - Williamsville NY

Assignee:

AlliedSignal Inc. - Morris County NJ

International Classification:

C07C 1738
C07C 1708

US Classification:

570178

Abstract:

A process for the preparation of one or more of CHClFCF. sub. 3 (HCFC-124), CHF. sub. 2 CClF. sub. 2 (HCFC-124a) and CHF. sub. 2 CF. sub. 3 (HFC-125) by reaction of perchloroethylene with hydrogen fluoride in a single stage reaction vessel in the presence of a fluorination catalyst. These compounds are useful in a variety of industrial applications including blowing agents, refrigerants, sterilant gases and solvent applications. Distilling the reaction product produces a distillate comprising HCl, CHClFCF. sub. 3, CHF. sub. 2 CClF. sub. 2 and CHF. sub. 2 CF. sub. 3 and a minor amount of HF which distillate is scrubbed to remove the acids. The bottoms product comprises perchloroethylene, hydrogen fluoride and organic by-products which is phase separated to sequester the hydrogen fluoride from the mixture of perchloroethylene and organic by-products. The hydrogen fluoride and mixture of perchloroethylene with organic by-products are then preferably re-mixed at a controlled rate and recycled to the reaction vessel.

US Patent:

58956395, Apr 20, 1999

Filed:

Jul 3, 1996

Appl. No.:

8/675032

Inventors:

Charles Francis Swain - Williamsville NY
Rajiv Ratna Singh - Getzville NY
Hang Thanh Pham - Amherst NY

Assignee:

AlliedSignal Inc. - Morristown NJ

International Classification:

C01B 719
C07C 1738

US Classification:

423483

Abstract:

The invention provides a process for the separation of azeotropic mixtures of fluorocarbons from hydrogen fluoride. The most preferred fluorocarbon for this invention is 1,1,1,3,3-pentafluoropropane, which is also known as HFC-245fa. The separation in conducted by adding sulfuric acid to the mixture while the mixture is in either the liquid or gaseous states.