Frank C Weigert

US Patent:

6706935, Mar 16, 2004

Filed:

Feb 6, 2003

Appl. No.:

10/359357

Inventors:

Leo Ernest Manzer - Wilmington DE
Frank Julian Weigert - Wilmington DE

Assignee:

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

International Classification:

C07C 1700

US Classification:

570163, 570169

Abstract:

A method is disclosed for increasing in a composition the mole fraction of a compound selected from the group CF CHCl , CF CHF and CF CHClF relative to the total mole fraction of the other two compounds of the group. The method comprises (a) providing a gaseous composition comprising at least one compound of said group provided that (i) if the selected compound is either CF CHCl or CF CHF , said gaseous composition comprises CF CHFCl and the mole fraction of the selected compound relative to the other two compounds in said gaseous composition is less than its equilibrium amount at 50Â C. , and (ii) if the selected compound is CF CHFCl, said gaseous composition comprises both CF CHCl and CF CHF and the mole fraction of the selected compound relative to the other two compounds in said gaseous composition is less than its equilibrium amount at 500Â C. ; (b) contacting said gaseous composition with a catalyst selected from the group of catalysts consisting of catalysts comprising chromium as an oxide, as a halide or as a halided oxide, in a valence state of three to six, and supported catalysts containing at least one metal selected from cobalt, copper, iron, manganese, nickel and zinc for a time sufficient to provide substantial equilibrium between the three compounds having said formula; and (c) providing during said catalyst contact a temperature within the range of about 50Â C. to 500Â C.

US Patent:

47345039, Mar 29, 1988

Filed:

Feb 7, 1986

Appl. No.:

6/827011

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C07D21172
C07C 2124
C07C 2513
C07C 1700

US Classification:

546345

Abstract:

Catalytic transhalogenation of haloaromatics according to the equation: C. sub. z F. sub. a X. sub. b N. sub. e L. sub. 1 +C. sub. z F. sub. c X. sub. d N. sub. e L. sub. 2. fwdarw. C. sub. z F. sub. a+1 X. sub. b-1 N. sub. e L. sub. 1 +C. sub. z F. sub. c-1 X. sub. d+1 N. sub. e L. sub. 2 wherein: when C. sub. z is a benzene derivative, a+b=5; e=0; c+d=5; z=6; when C. sub. z is a pyridine derivative, a+b=4; e=1; c+d=4; z=5; when C. sub. z is a naphthalene derivative, a+b=7; e=0; c+d=7; z=10; and when C. sub. z is a biphenyl derivative, a+b=9; e=0; c+d=9; z=12; L. sub. 1 and L. sub. 2, alike or different, are selected from F, Cl, Br, H, CN, C. sub. n F. sub. 2n+1, and C. sub. 6 F. sub. 5 ; X is Cl, Br, or I when C. sub.

US Patent:

48208841, Apr 11, 1989

Filed:

Nov 24, 1987

Appl. No.:

7/129371

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C07C 1724
C07C 2118
C07C 2124

US Classification:

570156

Abstract:

A method for preparing an unsaturated fluorocarbon by defluorinating a perfluoroalkane employing activated carbon.

US Patent:

41361563, Jan 23, 1979

Filed:

Aug 30, 1976

Appl. No.:

5/718681

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C01C 302

US Classification:

423372

Abstract:

Hydrogen cyanide is produced by reacting an organic nitrile with hydrogen at temperatures of 400-700. degree. C in the presence of selected catalysts. Exemplary is the reaction of benzonitrile and hydrogen at 600. degree. C in the presence of chromia on alumina to produce hydrogen cyanide.

US Patent:

50935275, Mar 3, 1992

Filed:

Oct 1, 1985

Appl. No.:

6/782575

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C07C20900
C07C21147
C07C21145

US Classification:

564409

Abstract:

A process is disclosed for the preparation of methyl- and ethyl-substituted anilines by contacting anilines of specified formula at about 250. degree. -525. degree. C. and about 10 kPa-10 MPa of pressure in the of presence of a nonbasic metal oxide catalyst which when it is a zeolite has pore dimensions of at least about 0. 52 nm and has cages with dimensions greater than about 0. 75 nm.

US Patent:

52213617, Jun 22, 1993

Filed:

Sep 4, 1991

Appl. No.:

7/755460

Inventors:

Douglas R. Anton - Claymont DE
Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

B08B 300
C11D 730
C11D 750
C23G 5028

US Classification:

134 38

Abstract:

Mixtures of the compound 1,1,1,2,2,5,5,5-octafluoro-4-trifluoromethylpentane with alcohols, ethers, esters, ketones, nitrogen-containing organic compounds, and halogenated hydrocarbons are disclosed; as is a process for cleaning a solid surface which comprises treating the surface with said mixtures. Binary mixtures of 1,1,1,2,2,5,5,5-octafluoro-4-trifluoromethylpentane with about 5 to 13 weight percent methanol, with about 2 to 10 weight percent ethanol, with about 3 to 11 weight percent isopropanol, with about 50 to 58 weight percent dichloromethane, and with about 1 to 9 weight percent acetonitrile, are disclosed as azeotrope or azeotrope-like compositions and are particularly suited for use where solvent recovery and reuse is practiced.

US Patent:

48047848, Feb 14, 1989

Filed:

Oct 1, 1985

Appl. No.:

6/782573

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C07C 8524

US Classification:

564409

Abstract:

A process is disclosed for the preparation of methyl- and ethyl-substituted anilines by contacting anilines of specified formula at about 250. degree. -525. degree. C. and about 10 kPa-10 MPa of pressure in the of presence of a nonbasic metal oxide catalyst which when it is a zeolite has pore dimensions of at least about 0. 52 nm and has cages with dimensions greater than about 0. 75 nm.

US Patent:

41645529, Aug 14, 1979

Filed:

May 15, 1978

Appl. No.:

5/905970

Inventors:

Frank J. Weigert - Wilmington DE

Assignee:

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

International Classification:

C01C 302

US Classification:

423376

Abstract:

Hydrogen cyanide is produced by reacting a hydrocarbon having at least 3 carbons with ammonia at temperatures of 650. degree. -950. degree. C. in the presence of selected catalysts. Exemplary is the reaction of toluene with ammonia at 700. degree. C. using a hydrogen exchanged faujasite catalyst.