John Eng

US Patent:

6841505, Jan 11, 2005

Filed:

Oct 11, 2002

Appl. No.:

10/269363

Inventors:

John H. Eng - Wilmington DE, US

Assignee:

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

International Classification:

B01J 3100

US Classification:

502150, 528279, 560 98, 525 10

Abstract:

A catalyst composition prepared from (a) titanium tetrahydrocarbyloxide, (b) zirconium tetrahydrocarbyloxide, and (c) tetraalkyl ammonium hydroxide, wherein the molar ratio of Zr:Ti is from about 0. 02:1 to about 5:1 and the molar ratio of TAAH:(Ti+Zr) is from about 0. 05:1 to about 2:1.

US Patent:

6887953, May 3, 2005

Filed:

Oct 11, 2002

Appl. No.:

10/269734

Inventors:

John Harvey Eng - Wilmington DE, US

Assignee:

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

International Classification:

C08F002/00

US Classification:

526 67, 528302, 5283086, 528481, 528501, 528503, 526 65, 526 66, 526 68

Abstract:

A process that can be used for direct esterification of a dicarboxylic acid such as terephthalic acid with a glycol such as 1,3-propanediol. The process comprises (1) contacting, at an elevated temperature, optionally in the presence of a preformed oligomer, the acid with the glycol to produce a product mixture comprising (i) a water-glycol vapor mixture, which or a portion of which exits the product mixture at the temperature to form a water-glycol vapor mixture and (ii) a liquid product mixture comprising an oligomer having a degree of polymerization of from about 1. 9 to about 3. 5 and comprising repeat units derived from the acid; (2) separating the glycol from the water-glycol mixture to produce a recovered glycol; and (3) returning the recovered glycol to the product mixture such that the liquid product mixture comprises an excess free glycol.

US Patent:

7358211, Apr 15, 2008

Filed:

Nov 24, 2004

Appl. No.:

10/996756

Inventors:

John Harvey Eng - Wilmington DE, US

Assignee:

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

International Classification:

B01J 23/40
B01J 23/42
B01J 23/00

US Classification:

502326, 502350

Abstract:

A process for preparing a catalyst, comprising sequentially: (a) saturating a TiOsupport with aqueous ruthenium solution; (b) treating the ruthenium saturated TiOsupport with an aqueous base solution; and (c) curing the ruthenium saturated TiOto impregnate the TiOwith ruthenium. Preferably, subsequent to step (c) the process comprises sequentially (d) washing the ruthenium impregnated TiOwith water, (e) drying the washed ruthenium impregnated TiO, and (f) heat treating the ruthenium impregnated TiOunder reducing conditions at temperatures of 150-800 C. A catalyst prepared by the process. A process for the production of 1,3-propanediol, comprising: (a) providing 3-hydroxypropanal and the catalyst, and (b) hydrogenating the 3-hydroxypropanal in the presence of the catalyst.

US Patent:

7504474, Mar 17, 2009

Filed:

Dec 14, 2006

Appl. No.:

11/638917

Inventors:

John Harvey Eng - Wilmington DE, US
Emily A. Blum - Winterville NC, US
Daniel Albert Green - Moylan PA, US
Gene Parrish - Lagrange NC, US
Robert E. Trotter - Wilmington DE, US
Gary J. Wilson - Greenville NC, US

Assignee:

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

International Classification:

C08G 63/02
C08G 63/00

US Classification:

528272, 264103, 428364, 428373, 428374

Abstract:

This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by product resulting from the process is condensed in a condenser, and a portion of the condensed by-product is recycled to the condenser while anther portion is recycled back into the process.

US Patent:

7524921, Apr 28, 2009

Filed:

Dec 14, 2006

Appl. No.:

11/638978

Inventors:

John Harvey Eng - Wilmington DE, US
Emily A. Blum - Winterville NC, US
Daniel Albert Green - Moylan PA, US
Carl J. Giardino - Hixson TN, US
Gene Parrish - Lagrange NC, US
Robert E. Trotter - Wilmington DE, US
Gary J. Wilson - Greenville NC, US

Assignee:

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

International Classification:

C08G 63/00
C08G 63/02

US Classification:

528279, 29594, 381355, 381359, 381369, 524800, 524802, 528271, 528272, 528274, 528275, 528287

Abstract:

This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by-product resulting from the process is condensed in a condenser, the total amount of any trimethylene terephthalate cyclic dimer and poly(trimethylene terephthalate) in the condensed by-product 1,3-propanediol is adjusted, and a portion of the condensed by-product is recycled to the condenser while another portion is recycled back into the process.

US Patent:

7531617, May 12, 2009

Filed:

Dec 14, 2006

Appl. No.:

11/638919

Inventors:

John Harvey Eng - Wilmington DE, US
Emily A. Blum - Winterville NC, US
Daniel Albert Green - Moylan PA, US
Carl J. Giardino - Hixson TN, US
Gene Parrish - Lagrange NC, US
Robert E. Trotter - Wilmington DE, US
Gary J. Wilson - Greenville NC, US

Assignee:

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

International Classification:

C08G 63/00
C08G 63/02

US Classification:

528279, 29594, 381355, 381359, 381369, 524800, 524802, 528271, 528272, 528274, 528275, 528287

Abstract:

This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by product resulting from the process is condensed in a condenser, and a portion of the condensed by-product is recycled back into the process.

US Patent:

20130056898, Mar 7, 2013

Filed:

Feb 24, 2012

Appl. No.:

13/404314

Inventors:

JOHN HARVEY ENG - Wilmington DE, US
Michael Joseph Molitor - Wilmington DE, US
Dennis Gerard Madeleine - Wilmington DE, US

Assignee:

E I DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

B29B 9/06
B29C 47/00

US Classification:

264138, 264178 F

Abstract:

The process creates a radial temperature gradient in an extruded strand in a direction normal to the direction of motion thereof (that is, normal to the longitudinal direction thereof) so that upon exiting the first quench region the surface of the strand has solidified while at least the preponderant portion of the interior of the strand remains above the cold crystallization temperature, TThen, in the annealing region, heat from the warmer interior will be transferred to the cooler surface, causing the surface to heat up into the range of T, thereby inducing the surface to undergo crystallization. Once the surface has undergone crystallization, the strand is thoroughly quenched in a second quench region so that the strand will be ready for pelletization, accumulation or other handling steps.

US Patent:

20130059023, Mar 7, 2013

Filed:

Feb 27, 2012

Appl. No.:

13/405387

Inventors:

Dennis Gerard Madeleine - Wilmington DE, US
Michael Joseph Molitor - Wilmington DE, US
John Harvey Eng - Wilmington DE, US

Assignee:

E I DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

B29C 47/08

US Classification:

425 71

Abstract:

An apparatus is described having an extrusion means for extruding a molten polymer strand; a pelletizer; and a trough disposed to convey a polymer strand from the extrusion means to the pelletizer; the trough has an interior bottom surface; a water dispensing means disposed to provide a layer of water on a first portion of the interior bottom surface that is proximate to the extrusion means; a mesh or perforated surface disposed in the trough downstream from the water dispensing means, disposed to permit the separation of water from a water-immersed strand incident upon it; and a second portion of the interior bottom surface downstream from that mesh or perforated surface, disposed to contain a layer of water.