John D Ledford

US Patent:

7098367, Aug 29, 2006

Filed:

Aug 23, 2004

Appl. No.:

10/923961

Inventors:

John S. Ledford - Richmond TX, US
Jaap W. Van Hal - Fresno TX, US
Xiankuan Zhang - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

C07C 31/20
C07C 31/18

US Classification:

568867, 568680

Abstract:

Disclosed is a process for the preparation of alkylene glycols from the corresponding alkylene oxide, such as ethylene glycol from ethylene oxide, in the presence of water, a catalyst and, optionally, carbon dioxide. The catalyst contains amines which are weak bases, specifically having pKof at least 5. 5, preferably 8 to 11. The amines may be primary, secondary, tertiary or a blend thereof or may be a compound having a structural combination of primary, secondary and/or tertiary amines.

US Patent:

7161046, Jan 9, 2007

Filed:

Sep 30, 2004

Appl. No.:

10/955796

Inventors:

Jaap W. Van Hal - Fresno TX, US
John S. Ledford - Richmond TX, US
Xiankuan Zhang - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

C07C 29/00
C07C 31/02
C07C 33/00

US Classification:

568840

Abstract:

Disclosed is a process for the preparation of alkylene glycols from the corresponding alkylene oxide, such as ethylene glycol from ethylene oxide, in the presence of water, a catalyst and, optionally, carbon dioxide. The catalyst is a SALEN-type compound which contains an amino group and an oxy or hydroxy group connected by a hydrocarbon, such as an alkyl or an alkylaryl. The SALEN-type compounds may be Schiff bases, i. e. , a condensate product of a primary amine with an aldehyde, ketone or an alcohol. The SALEN-type compound may be a mono or bis compound and may be complexed with a Group 4-14 metal, such as aluminum, tin, vanadium, chromium, manganese, iron, cobalt or platinum.

US Patent:

7196233, Mar 27, 2007

Filed:

Dec 7, 2004

Appl. No.:

11/005681

Inventors:

John S. Ledford - Richmond TX, US
Jaap W. Van Hal - Fresno TX, US
Xiankuan Zhang - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

C07C 29/10

US Classification:

568867

Abstract:

Disclosed is a process for the preparation of alkylene glycols from the corresponding alkylene oxide, such as ethylene glycol from ethylene oxide, in the presence of water, a catalyst and, optionally, carbon dioxide. The catalyst contains an amphoteric compound, such as such as (ethylenedinitrilo) tetraacetic acid (EDTA). These befunctional compounds have both acid and base moieties. Preferably, a compound useful in the present invention forms a buffered solution in water, i. e. , the acid and base moieties do not completely disassociate. The pH of the buffered solution should be 2-10, preferably 5-10, more preferably 4-9. A compound useful in the present invention is preferably organic with the base moiety and the acid moiety being separated by one to four carbon atoms.

US Patent:

7232788, Jun 19, 2007

Filed:

Mar 14, 2005

Appl. No.:

11/079038

Inventors:

Wugeng Liang - Katy TX, US
Scott A. Stevenson - Houston TX, US
James W. Kauffman - Katy TX, US
John S. Ledford - Mason OH, US
Joseph R. Linzer - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

B01J 23/00
B01J 21/00
B01J 20/00

US Classification:

502311, 502240, 502255, 502263, 502305, 502313, 502314, 502315, 502316, 502321, 502322, 502349, 502350, 502415, 502439

Abstract:

A catalyst for production of unsaturated aldehydes, such as methacrolein, by gas phase catalytic oxidation of olefins, such as isobutylene, contains oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals. The catalyst has a certain relative amount ratio of cesium to bismuth, a certain relative amount ratio of iron to bismuth and a certain relative amount ratio of bismuth, iron, cesium and certain other metals to molybdenum and, optionally, tungsten. For a catalyst of the formula:MoBiWFeCoNiSbCsMgZnPOwherein a is 0. 1 to 1. 5, b is 0 to 4, c is 0. 2 to 5. 0, d is 0 to 9, e is 0 to 9, f is 0 to 2. 0, g is from 0. 4 to 1. 5, h is 0 to 1. 5, i is 0 to 2. 0, j is 0 to 0. 5 and x is determined by the valences of the other components, c:g=3. 3–5. 0, c:a=2. 0–6. 0 and (3a+3c+2d+2e+g+2h+2i)/(2×12+2b)=0. 95–1. 10.

US Patent:

7253325, Aug 7, 2007

Filed:

Oct 2, 2006

Appl. No.:

11/541764

Inventors:

Jaap W. Van Hal - Fresno TX, US
John S. Ledford - Richmond TX, US
Xiankuan Zhang - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

C07C 29/00
C07C 31/00
C07C 31/02
C07C 33/00

US Classification:

568840

Abstract:

Disclosed is a process for the preparation of alkylene glycols from the corresponding alkylene oxide, such as ethylene glycol from ethylene oxide, in the presence of water, a catalyst and, optionally, carbon dioxide. The catalyst is a SALEN-type compound which contains an amino group and an oxy or hydroxy group connected by a hydrocarbon, such as an alkyl or an alkylaryl. The SALEN-type compounds may be Schiff bases, i. e. , a condensate product of a primary amine with an aldehyde, ketone or an alcohol. The SALEN-type compound may be a mono or bis compound and may be complexed with a Group 4-14 metal, such as aluminum, tin, vanadium, chromium, manganese, iron, cobalt or platinum.

US Patent:

7501377, Mar 10, 2009

Filed:

May 24, 2007

Appl. No.:

11/805660

Inventors:

Wugeng Liang - Katy TX, US
Scott A. Stevenson - Houston TX, US
James W. Kauffman - Katy TX, US
John S. Ledford - Sugar Land TX, US
Joseph R. Linzer - Issaquah WA, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

B01J 23/00
B01J 21/00
B01J 20/00

US Classification:

502311, 502240, 502255, 502263, 502305, 502313, 502314, 502315, 502316, 502321, 502322, 502349, 502350, 502415, 502439

Abstract:

A catalyst for production of unsaturated aldehydes, such as methacrolein, by gas phase catalytic oxidation of olefins, such as isobutylene, contains oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals. The catalyst has a certain relative amount ratio of cesium to bismuth, a certain relative amount ratio of iron to bismuth and a certain relative amount ratio of bismuth, iron, cesium and certain other metals to molybdenum and, optionally, tungsten. For a catalyst of the formula:MoBiWFeCoNiSbCsMgZnPOwherein a is 0. 1 to 1. 5, b is 0 to 4, c is 0. 2 to 5. 0, d is 0 to 9, e is 0 to 9, f is 0 to 2. 0, g is from 0. 4 to 1. 5, h is 0 to 1. 5, i is 0 to 2. 0, j is 0 to 0. 5 and x is determined by the valences of the other components, c:g=3. 3-5. 0, c:a=2. 0-6. 0 and (3a+3c+2d+2e+g+2h+2i)/(2×12+2b)=0. 95-1. 10.

US Patent:

8193387, Jun 5, 2012

Filed:

Apr 16, 2009

Appl. No.:

12/386280

Inventors:

Paulette N. Hazin - Sugar Land TX, US
Frederick Merrill Galloway - Tomball TX, US
John S. Ledford - Sugar Land TX, US
Andy H. Nuyen - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh,

International Classification:

C07C 51/16

US Classification:

562549

Abstract:

A one-step vapor phase oxidation process produces an unsaturated carboxylic acid, such as acrylic acid or methacrylic acid, from an alkane, such as propane or isobutane, with a mixed metal oxide catalyst and an excess of alkane relative to oxygen. The unreacted alkane and the byproduct alkene are recycled to the reaction zone without separation. Overall yield and productivity of the unsaturated carboxylic improves for such a process. An analogous method for the preparation of unsaturated nitrites is also disclosed.

US Patent:

7361791, Apr 22, 2008

Filed:

May 24, 2007

Appl. No.:

11/805805

Inventors:

Wugeng Liang - Katy TX, US
Scott A. Stevenson - Houston TX, US
James W. Kauffman - Katy TX, US
John S. Ledford - Mason OH, US
Joseph R. Linzer - Houston TX, US

Assignee:

Saudi Basic Industries Corporation - Riyadh

International Classification:

C07C 45/35
B01J 23/00

US Classification:

568476, 568479, 502311

Abstract:

A catalyst for production of unsaturated aldehydes, such as methacrolein, by gas phase catalytic oxidation of olefins, such as isobutylene, contains oxides of molybdenum, bismuth, iron, cesium and, optionally, other metals. The catalyst has a certain relative amount ratio of cesium to bismuth, a certain relative amount ratio of iron to bismuth and a certain relative amount ratio of bismuth, iron, cesium and certain other metals to molybdenum and, optionally, tungsten. For a catalyst of the formula:MoBiWFeCoNiSbCsMgZnPOwherein a is 0. 1 to 1. 5, b is 0 to 4, c is 0. 2 to 5. 0, d is 0 to 9, e is 0 to 9, f is 0 to 2. 0, g is from 0. 4 to 1. 5, h is 0 to 1. 5, i is 0 to 2. 0, j is 0 to 0. 5 and x is determined by the valences of the other components, c:g=3. 3-5. 0, c:a=2. 0-6. 0 and (3+3+2+2+g+2+2)/(2×12+2)=0. 95-1. 10.