Ralph B Miller

US Patent:

6458249, Oct 1, 2002

Filed:

Nov 9, 1998

Appl. No.:

09/189322

Inventors:

Ralph Newton Miller - Newark DE
Chien-Ping Chai Kao - Newark DE
Barry Asher Mahler - Glen Mills PA

Assignee:

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

International Classification:

B01D 334

US Classification:

203 51, 203 49, 203 57, 203 67, 203 68, 203 70, 203 71, 423406, 570178

Abstract:

Nitrogen trifluoride (NF ) containing less than 10 parts-per-million molar impurities, e. g. , tetrafluoromethane (PFC-14), is disclosed. Azeotropic and extractive distillation processes using entraining agents for separating NF and PFC-14 from each other and from mixtures with other electronics industry materials are disclosed.

US Patent:

6677493, Jan 13, 2004

Filed:

Apr 1, 1999

Appl. No.:

09/283449

Inventors:

Ralph Newton Miller - Newark DE
V. N. Mallikarjuna Rao - Wilmington DE
Steven H. Swearingen - Wilmington DE

Assignee:

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

International Classification:

C07C 1908

US Classification:

570134, 25218211, 25218212, 25218232, 25218213

Abstract:

A process is disclosed for the separation of a mixture of HF and CF CClFCF. The process involves placing the mixture in a separation zone at a temperature of from about -30Â C. to about 100Â C. and at a pressure sufficient to maintain the mixture in the liquid phase, whereby an organic-enriched phase comprising less than 50 mole percent HF is formed as the bottom layer and an HF-enriched phase comprising more than 90 mole percent HF is formed as the top layer. The organic-enriched phase can be withdrawn from the bottom of the separation zone and subjected to distillation in a distillation column to recover essentially pure CF CClFCF. The distillate comprising HF and CF CClFCF can be removed from the top of the distillation column while essentially pure CF CClFCF can be recovered from the bottom of the distillation column. The HF-enriched phase can be withdrawn from the top of the separation zone and subjected to distillation in a distillation column. The distillate comprising HF and CF CClFCF can be removed from the top of the distillation column while essentially pure HF can be recovered from the bottom of the distillation column.

US Patent:

6900362, May 31, 2005

Filed:

Oct 31, 2002

Appl. No.:

10/285193

Inventors:

Ralph Newton Miller - Newark DE, US
Mario J. Nappa - Newark DE, US
Donald J. Toton - New Castle DE, US

Assignee:

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

International Classification:

C07C017/00
C07C019/08
C07C021/18
C07C017/08
C07C023/00

US Classification:

570165, 570134, 570136, 570123, 570124, 570177, 570178, 570166, 570167, 570168, 570169

Abstract:

A process for the production of HFC-227ea from HF and HFP is provided. This process takes advantage of an azeotropic composition of HF and HFC-227ea in order to produce HFC-227ea essentially free of HF and recycle unreacted HF back to the reactor. The recycle of said azeotropic composition, also allows the use of HFC-227ea as a diluent to aid in control of reactor temperature for a highly exothermic reaction.

US Patent:

7371309, May 13, 2008

Filed:

Aug 12, 1998

Appl. No.:

09/485559

Inventors:

Sara W. Boehmer - Newark DE, US
Barry Asher Mahler - Glen Mills PA, US
Ralph Newton Miller - Newark DE, US

Assignee:

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

International Classification:

B01D 3/40
C07C 17/386
C07C 19/08

US Classification:

203 57, 203 62, 203 63, 203 67, 203 68, 203 69, 203 70, 570178

Abstract:

The present invention provides extractive distillation processes for removing difluoromethane (HFC-32) from a mixture comprising HFC-32 and at least one of chlorodifluoromethane (CFC-12), 1,1,1-trifluoroethane (HFC-143a), chloropentafluoroethane (CFC-115), and pentafluoroethane (HFC-125) using hydrocarbon, chlorocarbon, and oxygen-containing extractive agents.

US Patent:

7385094, Jun 10, 2008

Filed:

Oct 31, 2006

Appl. No.:

11/590455

Inventors:

Ralph Newton Miller - Newark DE, US
Mario Joseph Nappa - Newark DE, US
Velliyur Nott Mallikarjuna Rao - Wilmington DE, US
Allen Capron Sievert - Elkton MD, US

Assignee:

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

International Classification:

C07C 17/00
C07C 17/38

US Classification:

570155, 570178

Abstract:

Disclosed herein are azeotrope and near-azeotrope compositions comprising 1,1,1,2,2,4,5,5,6,6,7,7,7-tridecafluoro-3-heptene (HFC-162-13mczy, CFCFCH═CFCFCFCF) and 1,1,1,2,2,3,5,5,6,6,7,7,7-tridecafluoro-3-heptene (HFC-162-13mcyz, CFCFCF═CHCFCFCF) and hydrogen fluoride (HF) and to azeotrope and near-azeotrope compositions comprising 1,1,1,2,2,3,4,5,5,6,6,7,7,7-tetradecafluoroheptane and hydrogen fluoride (HF). These compositions are useful in processes to produce and purify HFC-162-13mcyz, HFC-162-13mczy and HFC-63-14mee.

US Patent:

7388117, Jun 17, 2008

Filed:

Oct 30, 2006

Appl. No.:

11/590448

Inventors:

Ralph Newton Miller - Newark DE, US
Barbara Haviland Minor - Elkton MD, US
Mario Joseph Nappa - Newark DE, US
Velliyur Nott Mallikarjuna Rao - Wilmington DE, US
Allen Capron Sievert - Elkton MD, US

Assignee:

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

International Classification:

C07C 17/00
C07C 17/38

US Classification:

570155, 570178

Abstract:

Disclosed herein are azeotrope compositions comprising 1,2,3,3,3-pentafluoropropene and hydrogen fluoride. The azeotrope compositions are useful in processes to produce and in processes to purify 1,2,3,3,3-pentafluoropropene.

US Patent:

7423188, Sep 9, 2008

Filed:

Oct 30, 2006

Appl. No.:

11/590343

Inventors:

Ralph Newton Miller - Newark DE, US
Mario Joseph Nappa - Newark DE, US
Velliyur Nott Mallikarjuna Rao - Wilmington DE, US
Allen Capron Sievert - Elkton MD, US

Assignee:

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

International Classification:

C07C 17/00
C07C 17/38

US Classification:

570155, 570178

Abstract:

Disclosed herein are azeotrope and near-azeotrope compositions comprising E-1,3,3,3-tetrafluoropropene and hydrogen fluoride. These azeotrope and near-azeotrope compositions are useful in processes to produce E-1,3,3,3-tetrafluoropropene and in processes to purify E-1,3,3,3-tetrafluoropropene from mixtures of E-1,3,3,3-tetrafluoropropene with 1,1,1,3,3-pentafluoropropane and/or with hydrogen fluoride.

US Patent:

7476771, Jan 13, 2009

Filed:

Oct 31, 2006

Appl. No.:

11/590454

Inventors:

Ralph Newton Miller - Newark DE, US
Mario Joseph Nappa - Newark DE, US
Velliyur Nott Mallikarjuna Rao - Wilmington DE, US
Allen Capron Sievert - Elkton MD, US

Assignee:

E.I. Du Pont De Nemours + Company - Wilmington DE

International Classification:

C07C 17/38
C07C 17/00

US Classification:

570178, 570155

Abstract:

Disclosed herein are azeotrope or near-azeotrope compositions comprising 2,3,3,3-tetrafluoropropene (HFC-1234yf) and hydrogen fluoride (HF). These compositions are useful in processes to produce and purify HFC-1234yf. Additionally, disclosed herein are processes for the manufacture of HFC-1234yf.