David Roland Valdez

US Patent:

20040092767, May 13, 2004

Filed:

Nov 7, 2002

Appl. No.:

10/289572

Inventors:

Luis Chu - Forsyth IL, US
Ludovic Fodor - Beaumont TX, US
David Valdez - Victoria TX, US

International Classification:

C07C051/31

US Classification:

562/543000

Abstract:

Process for producing an aqueous solution comprising adipic acid, hydroxyhexanoic acid and oligomers thereof.

US Patent:

20180225201, Aug 9, 2018

Filed:

Jul 23, 2015

Appl. No.:

15/746841

Inventors:

- Houston TX, US
David C VALDEZ - Houston TX, US
Patrick A RAYMOND - Houston TX, US
Justin Haanbyull PARK - Houston TX, US
David P MOHR - Spring TX, US
Hai Ngoc NGUYEN - Spring TX, US
Michael Edward MCGOWEN - Houston TX, US

International Classification:

G06F 12/0804

Abstract:

A method for preserving volatile memory across a computer system disruption includes identifying a set of volatile memory. The set of volatile memory represents a portion of data in volatile memory to preserve during a system disruption. The method includes receiving a system event. The system event indicates that a computer system disruption will occur and that the set of volatile memory is to be written to a stable storage device. The method includes writing the set of volatile memory to the stable storage device to create a stored data set.

US Patent:

20160176813, Jun 23, 2016

Filed:

Jul 19, 2012

Appl. No.:

14/415176

Inventors:

- Wilimington DE, US
David Lee VALDEZ - Victoria TX, US

Assignee:

INVISTA NORTH AMERICA S.A R.L. - Wilmington DE

International Classification:

C07C 407/00
C07C 29/50
C07C 45/33

Abstract:

A reaction zone is provided comprising a plurality of oxygen clean up zones and a plurality of oxidation zones. A first stream is introduced to oxidation clean up zones comprising liquid cyclohexane, and optionally a cyclohexane oxidation catalyst. In addition, an oxygen containing gas is introduced into the oxidation zones. Next, the first stream is passed downwardly from the oxygen clean up zones to the oxidation zones, while cross-currently passing the oxygen containing gas upwardly from the oxidation zones to the oxygen clean up zones. The oxygen containing gas is introduced directly into the first stream as it travels through the oxidation zones, and the reaction between the first stream and the oxygen containing gas produces a product mixture. Finally, a product mixture is withdrawn from the oxidation zones that comprises CHHP, cyclohexanone and cyclohexanol.

US Patent:

20150232393, Aug 20, 2015

Filed:

Jul 19, 2012

Appl. No.:

14/415159

Inventors:

David Lee Valdez - Victoria TX, US

Assignee:

INVISTA NORTH AMERICA S.A R.L. - Wilmington DE

International Classification:

C07B 63/00
C07C 407/00
C07C 7/10
C07C 49/403
C07C 29/86

Abstract:

A method is disclosed for removing contaminants from a feed stream to a hydrogenation process that begins with providing a product mixture from an air oxidation reaction. A first liquid separation process and cooling procedure is used on the product mixture to form a cooled product mixture and a first vapor stream. The cooled product mixture is then subjected to a water wash to form a washed product mixture and an aqueous exit stream, wherein a majority of the water soluble other oxidation products from the cooled product mixture are present in the aqueous exit stream. Next, the washed product stream undergoes a second liquid separation and water removal to form a treated product mixture and a second vapor stream. Finally, the treated product mixture is recovered and can be fed to a hydrogenation process.

US Patent:

20150210619, Jul 30, 2015

Filed:

Jul 19, 2012

Appl. No.:

14/415161

Inventors:

David Lee Valdez - Victoria TX, US

Assignee:

INVISTA NORTH AMERICA S.A R.L. - Wilmington DE

International Classification:

C07C 45/33
C07C 407/00
C07C 29/50

Abstract:

A reaction zone is provided zone comprising a series of oxygen clean up zones and a series of oxidation zones. A first stream is introduced to oxidation clean up zones comprising liquid cyclohexane. Next, the first stream is passed downwardly from the oxygen clean up zones to the oxidation zones, while cross-currently passing the oxygen containing gas upwardly from the oxidation zones to the oxygen clean up zones. During the reaction, the oxidation zones are maintained at a temperature range of about 145 C. to about 170 C. The product mixture is withdrawn from the oxidation zones that comprises cyclohexylhydroperoxide (CHHP), cyclohexanone and cyclohexanol. An oxidation off-gas comprising less than 3.0% by volume of unreacted oxygen is withdrawn from the oxygen clean up zones.