Patents by Inventor Paul K. Ladwig

Paul K. Ladwig has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8022109
    Abstract: A filter system for use in a three-phase slurry reactor is provided. The filter system comprises one or more bundles of a plurality of filter elements for separating liquid from a mixture of liquid and solids contained in the reactor. Each filter bundle is connected to a product transfer conduit transporting separated liquid to a location outside of and downstream from the reactor. The transfer conduit is provided with means for backflushing the filter bundle and guard filter means.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: September 20, 2011
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: David G. Hammond, David C. Long, Paul K. Ladwig, Min Chang
  • Publication number: 20100160459
    Abstract: A filter system for use in a three-phase slurry reactor is provided. The filter system comprises one or more bundles of a plurality of filter elements for separating liquid from a mixture of liquid and solids contained in the reactor. Each filter bundle is connected to a product transfer conduit transporting separated liquid to a location outside of and downstream from the reactor. The transfer conduit is provided with means for backflushing the filter bundle and guard filter means.
    Type: Application
    Filed: November 20, 2009
    Publication date: June 24, 2010
    Inventors: David G. Hammond, David C. Long, Paul K. Ladwig, Min Chang
  • Patent number: 6803494
    Abstract: A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. The catalyst may be pre-coked with a carbonaceous feed. Alternatively, the carbonaceous feed used to coke the catalyst may be co-fed with the naphtha feed.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: October 12, 2004
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, Brian Erik Henry, Shun C. Fung
  • Patent number: 6602403
    Abstract: This invention is related to a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to about 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. The resulting product is a high octane naphtha.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: August 5, 2003
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Todd R. Steffens, Paul K. Ladwig
  • Patent number: 6558531
    Abstract: The invention relates to a process for maintaining heat balance in a fluidized bed catalytic cracking unit. More specifically, the invention relates to a combustion control method capable of maintaining or restoring heat balance by conducting, under appropriate conditions, fuel and an oxygen-containing gas to a transfer line. The transfer line conducts effluent including spent catalyst and combustion products to the unit's catalyst regeneration zone.
    Type: Grant
    Filed: March 13, 2001
    Date of Patent: May 6, 2003
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Todd R. Steffens, Paul K. Ladwig, George Melfi, John E. Asplin
  • Publication number: 20020169350
    Abstract: The invention is related to a catalyst and a process for selectively producing light (i.e., C2-C4) olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions. The catalysts do not require steam activation.
    Type: Application
    Filed: July 3, 2002
    Publication date: November 14, 2002
    Inventors: Todd R. Steffens, Paul K. Ladwig
  • Patent number: 6455750
    Abstract: The invention is related to a catalyst and a process for selectively producing light (i.e., C2-C4) olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions. The catalysts do not require steam activation.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: September 24, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Todd R. Steffens, Paul K. Ladwig
  • Patent number: 6388152
    Abstract: A process for producing polymers from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500° to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, which is then recycled to the reaction zone.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: May 14, 2002
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, Tan-Jen Chen
  • Patent number: 6339180
    Abstract: A process for producing polypropylene from olefins selectively produced from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: January 15, 2002
    Assignee: ExxonMobil Chemical Patents, Inc.
    Inventors: Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, B. Erik Henry
  • Patent number: 6339181
    Abstract: This invention relates to a process to produce propylene from a hydrocarbon feed stream, preferably a naphtha feed stream, comprising C5 and C6 components wherein a light portion having a boiling point range of 120° C. or less is introduced into a reactor separately from the other components of the feed stream.
    Type: Grant
    Filed: November 9, 1999
    Date of Patent: January 15, 2002
    Assignee: ExxonMobil Chemical Patents, Inc.
    Inventors: Tan-Jen Chen, Philip A. Ruziska, Gordon F. Stuntz, Paul K. Ladwig
  • Publication number: 20010040118
    Abstract: The present invention is a fluidized catalytic cracking process that incorporates a zoned riser reactor. The process provides an in-situ method for feed upgrading in a riser reactor. The process assists in the removal of undesirable contaminants, such as nitrogen, from FCC feedstocks.
    Type: Application
    Filed: March 6, 2001
    Publication date: November 15, 2001
    Inventors: Eduardo Mon, George A. Swan, Rustom M. Billimoria, Paul K. Ladwig
  • Patent number: 6315890
    Abstract: The invention is related to a two step process wherein the first step comprises cracking an olefinic naphtha resulting in a cracked product having a diminished total concentration of olefinic species. The second step comprises hydroprocessing at least a portion of the cracked product, especially a naphtha fraction, to provide a hydroprocessed cracked product having a reduced concentration of contaminant species but without a substantial octane reduction.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: November 13, 2001
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Paul K. Ladwig, Gordon F. Stuntz, Garland B. Brignac, Thomas R. Halbert
  • Patent number: 6313366
    Abstract: A process for producing propylene from a catalytically cracked or thermally cracked naphtha stream is disclosed herein. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500° C. to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia. A separate stream containing aromatics may be co-fed with the naphtha stream.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: November 6, 2001
    Assignee: ExxonMobile Chemical Patents, Inc.
    Inventors: Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, Brian Erik Henry, Shun C. Fung, Tan-Jen Chen, Jay F. Carpency, Ronald G. Searle
  • Publication number: 20010025806
    Abstract: The invention relates to a process for maintaining heat balance in a fluidized bed catalytic cracking unit. More specifically, the invention relates to a combustion control method capable of maintaining or restoring heat balance by conducting, under appropriate conditions, fuel and an oxygen-containing gas to a transfer line. The transfer line conducts effluent including spent catalyst and combustion products to the unit's catalyst regeneration zone.
    Type: Application
    Filed: March 13, 2001
    Publication date: October 4, 2001
    Inventors: Todd R. Steffens, Paul K. Ladwig, George Melfi, John E. Asplin
  • Patent number: 6258257
    Abstract: A process for producing polymers from olefins selectively produced by a two stage process for selectively producing C2 to C4 olefins from a gas oil or resid is disclosed herein. The gas oil or resid is reacted in a first stage comprising a fluid catalytic cracking unit wherein it is converted in the presence of conventional large pore zeolitic catalyst to reaction products, including a naphtha boiling range stream. The naphtha boiling range stream is introduced into a second stage comprising a process unit containing a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feed is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500 to 650° C. and a hydrocarbon partial pressure from about 10 to 40 psia.
    Type: Grant
    Filed: March 2, 2000
    Date of Patent: July 10, 2001
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: George A. Swan, III, Michael W. Bedell, Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, B. Erik Henry
  • Patent number: 6179993
    Abstract: A process for obtaining a substantial amount of olefinic products from a residual feedstock by use of a vapor short contact time conversion process unit comprised of a bed of fluidized heat transfer solids. The vapor short contact time process unit is operated at conditions which includes steam dilution to reduce partial pressure of hydrocarbon vapors and a vapor residence time less than about 0.5 seconds.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: January 30, 2001
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Noel M. Seimandi, Tony T. Cheng, Willibald Serrand, Mitchell Jacobson, Paul K. Ladwig, John F. Pagel, Michael R. Parrish, Hans A. Weisenberger
  • Patent number: 6114265
    Abstract: Disclosed is a process for controlling combustion in a fluid catalytic cracking regenerator. More specifically, afterburning which occurs during the combustion process is controlled by adjusting oxygen concentration in at least one of two combustion streams which is injected into a fluid catalytic cracking regenerator. Preferably, the combustion streams used in the invention are asymmetrically injected into a dense phase catalyst bed within the regenerator.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: September 5, 2000
    Assignee: Exxon Research and Engineering Company
    Inventors: Todd R. Steffens, Paul K. Ladwig
  • Patent number: 6106697
    Abstract: C.sub.2 to C.sub.4 olefins are selectively produced from a gas oil or resid in a two stage process. The gas oil or resid is reacted in a first stage comprised of a fluid catalytic cracking unit wherein it is converted in the presence of conventional large pore zeolitic catalyst to reaction products, including a naphtha boiling range stream. The naphtha boiling range stream is introduced into a second stage comprised of a process unit containing a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500 to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: August 22, 2000
    Assignee: Exxon Research and Engineering Company
    Inventors: George A. Swan, Michael W. Bedell, Paul K. Ladwig, John E. Asplin, Gordon F. Stuntz, William A. Wachter, Brian Erik Henry
  • Patent number: 6093867
    Abstract: A process for selectively producing C.sub.3 olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is introduced into a process unit comprised of a reaction zone, a stripping zone, a catalyst regeneration zone, and a fractionation zone. The naphtha feedstream is contacted in the reaction zone with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures ranging from about 500.degree. to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia. Vapor products are collected overhead and the catalyst particles are passed through the stripping zone on the way to the catalyst regeneration zone. Volatiles are stripped with steam in the stripping zone and the catalyst particles are sent to the catalyst regeneration zone where coke is burned from the catalyst, which is then recycled to the reaction zone.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: July 25, 2000
    Assignee: Exxon Research and Engineering Company
    Inventors: Paul K. Ladwig, John Ernest Asplin, Gordon F. Stuntz, Tan-Jen Chen
  • Patent number: 6069287
    Abstract: A process for selectively producing C.sub.2 -C.sub.4 olefins from a catalytically cracked or thermally cracked naphtha stream. The naphtha stream is contacted with a catalyst containing from about 10 to 50 wt. % of a crystalline zeolite having an average pore diameter less than about 0.7 nanometers at reaction conditions which include temperatures from about 500 to 650.degree. C. and a hydrocarbon partial pressure from about 10 to 40 psia.
    Type: Grant
    Filed: May 5, 1998
    Date of Patent: May 30, 2000
    Assignee: Exxon Research and Engineering Co.
    Inventors: Paul K. Ladwig, John Ernest Asplin, Gordon F. Stuntz, William A. Wachter, Brian Erik Henry