David J Sandell

US Patent:

7585923, Sep 8, 2009

Filed:

Sep 29, 2004

Appl. No.:

10/953262

Inventors:

David Jack Sandell - Beaumont TX, US
Marjorie E. King - Baton Rouge LA, US
Fred David Ehrman - Houston TX, US

Assignee:

Univation Technologies, LLC - Houston TX

International Classification:

C08F 2/00
C08F 4/00
C08F 2/38

US Classification:

526 64, 526 66, 526 90, 526 82

Abstract:

Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of rapidly monitoring and controlling polymerization reactions without the need to sample and test the polymer properties. The method uses reactor control data and material inventory data in a mathematical leading indicator function to control the reactor conditions, and thereby the products produced under those conditions.

US Patent:

7739217, Jun 15, 2010

Filed:

Aug 28, 2009

Appl. No.:

12/549755

Inventors:

Bohumil Vaclav Kral - Beaumont TX, US
David Jack Sandell - Beaumont TX, US

Assignee:

ExxonMobil Chemical Patents Inc. - Houston TX

International Classification:

G06F 15/18
C08F 2/00
G05D 23/00
G05D 7/00
B01J 8/18

US Classification:

706 47, 706 11, 706 12, 706 60, 526 64, 526113, 526901, 526905, 422109, 422110, 422113, 422138, 422139

Abstract:

One exemplary method for message suppression comprises: providing first and second rules, each having one or more preconditions and a conclusion, wherein the first rule also has a suppressed-by attribute and at least one of the second preconditions is suppressing; evaluating the one or more first and second preconditions; identifying the first rule as true or false; displaying the message of the second rule if all of the second preconditions are met; identifying the first rule as suppressed if the second rule is named in the suppressed-by attribute; and inhibiting the message display of the suppressed rule or routing the message to second display. The system can comprise: a database containing knowledge of the production unit; a user interface, and at least one precondition, a suppressed by attribute, and one or more rules each having a conclusion and at least one suppressing precondition; an inference engine; and a display.

US Patent:

7838605, Nov 23, 2010

Filed:

Sep 29, 2004

Appl. No.:

10/953263

Inventors:

David Jack Sandell - Beaumont TX, US
Marjorie E. King - Baton Rouge LA, US
Fred David Ehrman - Houston TX, US

Assignee:

Univation Technologies, LLC - Houston TX

International Classification:

C08F 2/00
C08F 4/00

US Classification:

526 66, 526 68, 526 69, 526 90

Abstract:

Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of rapidly monitoring and controlling polymerization reactions without the need to sample and test the polymer properties. The method uses reactor control data and material inventory data in a mathematical leading indicator function to control the reactor conditions, and thereby the products produced under those conditions.

US Patent:

8058366, Nov 15, 2011

Filed:

Jul 30, 2009

Appl. No.:

12/512183

Inventors:

David J. Sandell - Beaumont TX, US
Marjorie E. King - Lake Jackson TX, US
Fred D. Ehrman - Singapore, SG

Assignee:

Univation Technologies, LLC - Houston TX

International Classification:

C08F 2/00
C08F 4/00
C08F 2/38
C08G 85/00

US Classification:

526 64, 526 66, 526 90, 526 82

Abstract:

Embodiments of our invention relate generally to methods of monitoring and controlling polymerization reactions including reactions producing multimodal polymer products using multiple catalysts in a single reactor. Embodiments of the invention provide methods of rapidly monitoring and controlling polymerization reactions without the need to sample and test the polymer properties. The method uses reactor control data and material inventory data in a mathematical leading indicator function to control the reactor conditions, and thereby the products produced under those conditions.

US Patent:

20080154832, Jun 26, 2008

Filed:

Dec 22, 2006

Appl. No.:

11/644227

Inventors:

Bohumil Vaclav Kral - Beaumont TX, US
David Jack Sandell - Beaumont TX, US

International Classification:

G06N 5/02

US Classification:

706 47

Abstract:

One exemplary method for message suppression comprises: providing first and second rules, each having one or more preconditions and a conclusion, wherein the first rule also has a suppressed-by attribute and at least one of the second preconditions is suppressing; evaluating the one or more first and second preconditions; identifying the first rule as true or false; displaying the message of the second rule if all of the second preconditions are met; identifying the first rule as suppressed if the second rule is named in the suppressed-by attribute; and inhibiting the message display of the suppressed rule or routing the message to second display. The system can comprise: a database containing knowledge of the production unit; a user interface, and at least one precondition, a suppressed by attribute, and one or more rules each having a conclusion and at least one suppressing precondition; an inference engine; and a display.

US Patent:

61654183, Dec 26, 2000

Filed:

Jun 29, 1998

Appl. No.:

9/106677

Inventors:

David H. Anderson - Woodstown NJ
Kirk D. Carver - Beaumont TX
Richard M. Coon - Port Arthur TX
David J. Sandell - Beaumont TX

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

G05D 2300
G05D 700
B01J 818

US Classification:

422109

Abstract:

A system for controlling temperature of a polymerization process includes a primary reactor system having a polymerization reactor and a recycle gas line which includes a heat exchanger, a primary temperature controller which continuously measures temperature within the reactor and provides a coolant adjust signal, a secondary cooling system which circulates a mixture of fresh and recirculated coolant through the heat exchanger and a secondary temperature controller which continuously measures the temperature of the mixed coolant and adjusts the proportion of mixed coolant to fresh coolant based on the coolant adjust signal and the temperature of the mixed coolant.

US Patent:

20210139618, May 13, 2021

Filed:

Oct 29, 2020

Appl. No.:

17/084294

Inventors:

- Baytown TX, US
David J. Sandell - Sparks NV, US
Giyarpuram N. Prasad - Houston TX, US

International Classification:

C08F 10/02
C08F 10/06
C08F 2/01
C08F 2/34

Abstract:

In a process for producing an olefin polymer, an olefin monomer is polymerized to produce a particulate polymer product containing unreacted monomer. The polymer product is contacted with an inert gas to strip hydrocarbon impurities therefrom and produce a stripped polymer product and a gaseous first effluent stream containing inert gas and hydrocarbons. The stripped polymer product is recovered and the first effluent stream is compressed and cooled to condense hydrocarbons contained therein and produce a gaseous second effluent stream. Part of the second effluent stream is contacted with a first membrane separator to produce a first hydrocarbon-enriched permeate stream and a first hydrocarbon-depleted residue stream. The first residue stream is contacted with a second membrane separator to produce a second hydrocarbon-enriched permeate stream and a second hydrocarbon-depleted residue stream. The second permeate stream and an oxidizing agent are supplied to a flameless thermal oxidation unit.

US Patent:

20210079126, Mar 18, 2021

Filed:

Nov 19, 2020

Appl. No.:

16/952991

Inventors:

- Baytown TX, US
Handel D. Bennett - Houston TX, US
David T. Lakin - Houston TX, US
Aaron C. McGinnis - Houston TX, US
Benjamin J. Ohran - Humble TX, US
David J. Sandell - Sparks NV, US

International Classification:

C08F 2/34
C08F 2/01
C08F 210/02
C08F 210/06
C08F 210/16

Abstract:

A process for producing an olefin polymer employs a gas phase polymerization reactor having a product discharge system comprising first and second pairs of lock hoppers, wherein each pair comprises an upstream lock hopper connected by valve means to the reactor and a downstream lock hopper connected by valve means to the upstream lock hopper and by further valve means to a product recovery system, and wherein a first cross-tie is provided between the upstream lock hoppers of the first and second pairs of lock hoppers and a second cross-tie is provided between the downstream lock hoppers of the first and second pairs of lock hoppers. Operation of the second cross-tie during product removal cycles is controlled in accordance with reactor pressure.

Author:

David Sandell

ISBN #:

0072764414