Linda Cheng

US Patent:

6406521, Jun 18, 2002

Filed:

Nov 30, 1999

Appl. No.:

09/451645

Inventors:

Linda S. Cheng - Des Plaines IL 60017-5017
Joel Padin - Ann Arbor MI 48109-2136
Salil U. Rege - Ann Arbor MI 48109-2136
Stephen T. Wilson - Des Plaines IL 60017-5017
Ralph T. Yang - Ann Arbor MI 48109-2136

International Classification:

B01D 53047

US Classification:

95 98, 95101, 95102, 95105, 95144, 95902

Abstract:

A process is provided for the concentration and recovery of propylene from propane by a pressure swing adsorption (PSA) process using an adsorbent comprising AlPO-14. A PSA process is used to remove propylene from a C hydrocarbon stream comprising propylene and propane. The PSA process of the present invention can be employed in petroleum refining and petrochemical processes to purify and separate propylene from mixtures of propylene and propane without fractionation.

US Patent:

6444869, Sep 3, 2002

Filed:

Jul 19, 2001

Appl. No.:

09/909249

Inventors:

John J. Senetar - Naperville IL
Lawrence W. Miller - Palatine IL
Linda Shi Cheng - Chicago IL
Mark M. Davis - Chicago IL

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 700

US Classification:

585809, 585802, 585638, 585639, 585640, 585820, 585822

Abstract:

A process is provided for the concentration and recovery of ethylene and heavier components from an oxygenate conversion process. A separation process such as a pressure swing adsorption (PSA) process is used to remove hydrogen and methane from a demethanizer overhead stream comprising hydrogen, methane and C hydrocarbons and subsequently return the recovered C hydrocarbons to be admixed with the effluent from the oxygenate conversion process. This integration of a separation zone with a fractionation scheme in an ethylene recovery scheme using an initial demethanizer zone resulted in significant capital and operating cost savings by the elimination of cryogenic ethylene-based refrigeration from the overall recovery scheme.

US Patent:

7812208, Oct 12, 2010

Filed:

Sep 22, 2008

Appl. No.:

12/165359

Inventors:

Linda Shi Cheng - Highland Park IL, US
Jack E. Hurst - Mobile AL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 7/12

US Classification:

585827, 585820, 585828

Abstract:

Adsorbents and methods for the adsorptive separation of para-xylene from a mixture containing at least one other Caromatic hydrocarbon (e. g. , a mixture of ortho-xylene, meta-xylene, para-xylene, and ethylbenzene) are described. Suitable adsorbents comprise small-crystallite-size zeolite X having an average crystallite size of less than 1. 8 microns. The adsorbents may be binderless (e. g. , formulated with the substantial absence of an amorphous material that normally reduces selective pore volume) to further improve capacity and mass transfer. These properties are especially advantageous for improving productivity in low temperature, low cycle time adsorptive separation operations in a simulated moving bed mode.

US Patent:

8283274, Oct 9, 2012

Filed:

Jul 20, 2009

Appl. No.:

12/505654

Inventors:

Linda Shi Cheng - Highland Park IL, US
Jack Hurst - Mobile AL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

B01J 29/06

US Classification:

502 75, 502 60, 502 73, 502 79

Abstract:

Binderless BaKX zeolitic adsorbents, methods for their production, and processes for their use in a liquid phase adsorptive separation process are provided. An adsorbent includes a binder-converted zeolite portion formed from x wt % kaolin clay binder and (100-x) wt % unconverted Zeolite X with a silica:alumina molar ratio of about 2. 5. The kaolin clay binder is in the range of about 10 to about 20 wt %. Ba and K occupy cationic exchangeable sites within the adsorbent. K is in the range of about 0. 25 to about 0. 9% by weight and Ba is greater than about 31. 6% by weight of the binderless BaKX zeolitic adsorbent. Cornstarch may be added to the Zeolite X and kaolin clay binder to increase adsorbent macro-porosity and pore volume. Productivity of the adsorbent is improved decreasing process operating costs. The mechanical strength of the adsorbent is also improved.

US Patent:

8609925, Dec 17, 2013

Filed:

Jun 30, 2008

Appl. No.:

12/165412

Inventors:

Linda Shi Cheng - Highland Park IL, US
James A. Johnson - Clarendon Hills IL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 7/13
C07C 7/12

US Classification:

585828, 585820, 585827, 585826

Abstract:

Adsorbents and methods for the adsorptive separation of para-xylene from a mixture containing at least one other Caromatic hydrocarbon (e. g. , a mixture of ortho-xylene, meta-xylene, para-xylene, and ethylbenzene) are described. Suitable adsorbents comprise zeolite X having an average crystallite size of less than 1. 8 microns. The adsorbents provide improved mass transfer, which is especially advantageous for improving productivity in low temperature, low cycle time adsorptive separation operations in a simulated moving bed mode.

US Patent:

20120330081, Dec 27, 2012

Filed:

Sep 5, 2012

Appl. No.:

13/604039

Inventors:

Linda Shi Cheng - Highland Park IL, US
Jack Hurst - Mobile AL, US

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 7/12

US Classification:

585824

Abstract:

Binderless BaKX zeolitic adsorbents, methods for their production, and processes for their use in a liquid phase adsorptive separation process are provided. An adsorbent includes a binder-converted zeolite portion formed from x wt % kaolin clay binder and (100−x) wt % unconverted Zeolite X with a silica:alumina molar ratio of about 2.5. The kaolin clay binder is in the range of about 10 to about 20 wt %. Ba and K occupy cationic exchangeable sites within the adsorbent. K is in the range of about 0.25 to about 0.9% by weight and Ba is greater than about 31.6% by weight of the binderless BaKX zeolitic adsorbent. Cornstarch may be added to the Zeolite X and kaolin clay binder to increase adsorbent macro-porosity and pore volume. Productivity of the adsorbent is improved decreasing process operating costs. The mechanical strength of the adsorbent is also improved.

US Patent:

63038412, Oct 16, 2001

Filed:

Oct 4, 1999

Appl. No.:

9/411123

Inventors:

John J. Senetar - Naperville IL
Lawrence W. Miller - Palatine IL
Linda Shi Cheng - Chicago IL
Mark M. Davis - Chicago IL

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 100
C07C 120

US Classification:

585639

Abstract:

A process is provided for the concentration and recovery of ethylene and heavier components from an oxygenate conversion process. A separation process such as a pressure swing adsorption (PSA) process is used to remove hydrogen and methane from a demethanizer overhead stream comprising hydrogen, methane, and C2 hydrocarbons and subsequently return the recovered C2 hydrocarbons to be admixed with the effluent from the oxygenate conversion process. This integration of a separation zone with a fractionation scheme in an ethylene recovery scheme using an initial demethanizer zone resulted in significant capital and operating cost savings by the elimination of cryogenic ethylene-based refrigeration from the overall recovery scheme.

US Patent:

60600330, May 9, 2000

Filed:

Apr 22, 1998

Appl. No.:

9/064589

Inventors:

Linda Shi Cheng - Rolling Meadows IL

Assignee:

UOP LLC - Des Plaines IL

International Classification:

C07C 712
B01D 5302

US Classification:

423240S

Abstract:

The invention relates to a process for removing hydrogen halides from hydrocarbon-containing streams. More particularly, the invention relates to a process and an HCl sorbent for the removal of HCl and other hydrogen halides from hydrocarbon streams to prevent the formation of green oils. The sorbent has an increased capacity for the sorption of HCl and a reduced catalytic activity for the formation of green oils which, surprisingly, results from the pre-loading of water on a sodium promoted alumina adsorbent. The pre-loading of water on the sodium promoted alumina adsorbent in the range of about 5 to about 11 percent of the essentially water-free adsorbent increases the HCl sorption capacities by about 25% with a corresponding decrease in catalytic reactivity.