Thomas F Brownscombe

6355834, Mar 12, 2002

Aug 22, 2000

09/644228

Thomas Fairchild Brownscombe - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Sugarland TX

Shell Oil Company - Houston TX

C07C 5116

562412

Disclosed is a process for manufacturing an aromatic diacid in one step with a single catalyst system which comprises: a) Introducing into a reactor an aromatic hydrocarbon containing the number of rings desired in the product diacid with one or more alkyl groups attached to the rings; b) Reacting said aromatic hydrocarbon in the presence of an oxidant supply and a single catalyst system comprising at least one catalyst selected from Group IB, IIB, VB, or VIIB of the Periodic Table, in a reaction medium capable of stabilizing the aromatic acids formed against further oxidation to water and CO , or decarboxylation to aromatic hydrocarbons, and also capable of allowing the isomerization of the acids so formed to the desired diacids; and c) Reacting said hydrocarbon feed with said oxidant in the presence of said catalyst system until a desired amount of said feed is oxidized to carboxylic acids and isomerized to the desired diacid product.

6426431, Jul 30, 2002

Aug 22, 2000

09/643467

Zaida Diaz - Houston TX
Thomas F. Brownscombe - Houston TX

Mossi Ghisolfi Overseas S.A.

C07L 5142

562485, 562481

Disclosed is a method of increasing the yield of 2,6-NDA which comprises: a) Dissolving a disproportionation reaction product containing a dialkali salt of 2,6-NDA in water and filtering off insoluble matter from the resulting solution; b) Precipitating the monoalkali salt of 2,6-NDA (KHNDA) with CO ; c) Suspending said monoalkali salt in water in a weight ratio higher than 8:1, water: monosalt; and d) Heating at a temperature above 100Â C. and at a pressure above 100 psig. The improvements in yield are from about 20% to as high as 45%.

6441224, Aug 27, 2002

Aug 22, 2000

09/643353

Thomas Fairchild Brownscombe - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Stafford TX

Mossi Ghisolfi Overseas, S. A.

C07C 51347

562423, 562481, 562482

Disclosed is a method for selective carboxylation of naphthoic acid, or other aromatic mono-acids to form primarily 2,3-naphthalene dicarboxylic acid (2,3-NDA) or other aromatic diacids which comprises reacting said aromatic mono-acid in the presence of one or more metal oxide catalysts, alone, or in combination, and in the presence of about 0. 2 to 0. 8 moles excess of base over aromatic mono-acid, at a temperature of about 380Â C. to about 420Â C. , and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420Â C. to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.

6441225, Aug 27, 2002

Aug 22, 2000

09/643587

Thomas Fairchild Brownscombe - Houston TX

Mossi Ghisolfi Overseas, S.A.

C07C 5142

562485, 562486, 562494

A method is provided to produce dicarboxylic or tricarboxylic aromatic acid from salts of such acids, the method including the steps of providing an aqueous solution of a salt of a dicarboxylic or tricarboxylic aromatic acid, the aqueous solution having a pH of about 7 or greater; contacting the aqueous solution with sufficient carbon dioxide to lower the pH of the aqueous solution resulting in precipitation of at least a portion of the dicarboxylic or tricarboxylic aromatic acid; separating precipitated dicarboxylic or tricarboxylic aromatic acid from the solution; and recovering carbon dioxide from the solution.

6448436, Sep 10, 2002

Aug 22, 2000

09/644003

Keith Michael Kreitman - Houston TX
Steve Edward Brewer - Houston TX
John Bernard Rodden - Houston TX
Robert Lawrence Blackbourn - Houston TX
Thomas Fairchild Brownscombe - Houston TX
James Laurel Buechele - Houston TX
Ye-Mon Chen - Sugar Land TX
Zaida Diaz - Houston TX
Donn Anthony DuBois - Houston TX
Raymond Lawrence June - Singapore, SG
Brendan Dermot Murray - Houston TX
Michael Wayne Potter - Sugar Land TX

Mossi Ghisolfi Overseas, S. A. - Luxembourg

C07C 51265

562412, 562414

Disclosed is an integrated process for producing 2,6-naphthalene dicarboxylicacid comprising oxidizing a methylnaphthalene feedstock, hydrodebrominating the crude naphthoic acid product under conditions different from any work known in the art, forming a potassium salt of the acid; disproportionating the potassium salt to produce 2,6 potassium salts of NDA; selectively precipitating K NDA; selectively precipitating the monopotassium salt of 2,6 NDA(KHNDA); disproportionating the KHNDA into 2,6 NDA and K2NDA; further reacting the 2,6 NDA in a pipe reactor; and drying the product 2,6 NDA by conventional means or directly slurrying directly into a PEN process. The process can tolerate impurities in the economical methylnaphthalene feed and the resulting 2,6 NDA is of high quality with 50 ppm potassium.

6452045, Sep 17, 2002

Aug 22, 2000

09/643518

Thomas Fairchild Brownscombe - Houston TX
James Laurel Buechele - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Sugar Land TX

M G USA Corporation - Akron OH

C07C 51347

562481, 562488, 562490, 562492

Disclosed is a process for disproportionation of potassium naphthoate to the dipotassium salt of 2,6-NDA which gives reproducible improved yields of up to 40% which comprises: a) reacting naphthoic acid in the presence of excess base to produce a disproportionation feed comprising a finely dispersed disordered salt mixture of excess base salts and naphthoic acid salts, wherein the feed is prepared by the steps of: (1) Reacting naphthoic acid in the presence of excess base selected from the group consisting of carbonates and bicarbonates to form a salt; (2) Drying said salt mixture by a method which forms a highly mixed disordered salt mixture characterized by a differential scanning calorimeter(DSC) signature characterized by low melting peaks not previously observed in the salt; and b) Disproportionating said solid salts in the presence of a disproportionation catalyst to form the dipotassium salts of 2,6-NDA.

6479699, Nov 12, 2002

Jul 3, 2001

09/898890

Thomas Fairchild Brownscombe - Houston TX
Donn Anthony DuBois - Houston TX
Susan Secor Pfrehm - Houston TX
William Larry King - Stafford TX

Mossi Ghisolfi Overseas S.A.

C07C 51347

562481, 562482, 562488

Disclosed is a method for selective carboxylation of naphthoic acid, or other aromatic mono-acids to form primarily 2,3-naphthalene dicarboxylic acid (2,3-NDA) or other aromatic diacids which comprises reacting said aromatic mono-acid in the presence of one or more metal oxide catalysts, alone, or in combination, and in the presence of about 0. 2 to 0. 8 moles excess of base over aromatic mono-acid, at a temperature of about 380Â C. to about 420Â C. , and, in a second step, disproportionating the product of said selective carboxylation at a temperature above about 420Â C. to form a product with a greatly improved yield of 2,6-naphthalene dicarboxylic acid, or other aromatic dicarboxylic acid.

7413646, Aug 19, 2008

Dec 16, 2004

11/014028

Scott Lee Wellington - Bellaire TX, US
Thomas Fairchild Brownscombe - Houston TX, US

Shell Oil Company - Houston TX

C10G 47/02
C10G 47/00

208108, 20811115

Contact of a crude feed with a hydrogen source in the presence of an inorganic salt catalyst produces a total product that includes a crude product. The crude feed has a residue content of at least 0. 2 grams of residue per gram of crude feed. The inorganic salt catalyst may include one or more alkali metals. The crude product is a liquid mixture at 25 C. and 0. 101 MPa. One or more properties of the crude product may be changed by at least 10% relative to the respective properties of the crude feed.