Patents by Inventor Thomas R. Cannan

Thomas R. Cannan 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).

  • Regeneration of spent zeolite compositions
    Patent number: 6362122
    Abstract: A process for regenerating spent zeolite composites. The process involves contacting the composite, either as a shaped article or a fine powder, with a caustic solution, e.g., sodium hydroxide at treating condition. Once the contacting is completed, the composite is isolated, washed with water, dried and calcined to give a regenerated composite.
    Type: Grant
    Filed: November 8, 1999
    Date of Patent: March 26, 2002
    Assignee: UOP LLC
    Inventor: Thomas R. Cannan
  • Process for preparing low silica forms of zeolites having the faujasite type structure
    Patent number: 5366720
    Abstract: Low silica forms of faujasite-type zeolites are prepared from more siliceous forms of the same zeolite species by contacting the starting zeolite with a highly caustic concentrated sodium aluminate solution at elevated temperatures. In view of the fact that the process does not favor the formation of undesirable impurity phases such as zeolite A and thus does not require the presence of zeolite A nucleation inhibitors, the process is particularly advantageous in the production of forms of zeolite X having Si/Al.sub.2 molar ratios below 2.5.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: November 22, 1994
    Assignee: UOP
    Inventors: Alex J. Caglione, Thomas R. Cannan, Nanette Greenlay, Richard J. Hinchey
  • Process for drying CH.sub.2 F.sub.2 refrigerant utilizing zeolite
    Patent number: 5347822
    Abstract: Difluoromethane (R32) is of current interest as a partial replacement for chlorodifluoromethane (R22) refrigerant heretofore widely used in vapor compression refrigeration systems. R32 has, however, proved to be more reactive than is desirable with the zeolite A adsorbent-desiccant compositions used in such systems to prevent corrosion and freeze-up problems. The sodium cation form of a zeolite having the crystal structure of zeolite B is found to be an effective adsorbent for that purpose and to be significantly less reactive with the R32.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: September 20, 1994
    Assignee: UOP
    Inventors: Maryellen Lavin, Alan P. Cohen, Nanette Greenlay, Thomas R. Cannan, Richard J. Hinchey
  • Synthesis of zeolite beta
    Patent number: 5139759
    Abstract: Zeolite beta is synthesized hydrothermally from an aqueous reaction mixture containing the conventional reactive sources of SiO.sub.2, Al.sub.2 O.sub.3 and Na.sub.2 O tetraethylammonium halide as the source of the crystallization directing tetraethylammonium ions and diethanolamine as the agent providing the increased basicity necessary for the formation of zeolite beta crystals. Seed crystals of zeolite beta are optionally employed to shorten the crystallization period.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: August 18, 1992
    Assignee: UOP
    Inventors: Thomas R. Cannan, Richard J. Hinchey
  • Hydrocarbon conversions using catalysts silicoaluminophosphates
    Patent number: 5114563
    Abstract: The catalytic conversion of hydrocarbon feedstocks is affected under effective conversion process conditions in the presence of silicoaluminophosphate-based catalyst compositions.
    Type: Grant
    Filed: November 27, 1990
    Date of Patent: May 19, 1992
    Assignee: UOP
    Inventors: Brent M. Lok, Celeste A. Messina, Robert L. Patton, Richard T. Gajek, Thomas R. Cannan, Edith M. Flanigen
  • Zeolite LZ-133
    Patent number: 4842836
    Abstract: A novel crystalline aluminosilicate composition denominated "zeolite LZ-133" or simply "LZ-133" and having uniform pore dimensions of approximately 4.3 Angstroms is prepared hydrothermally from a reaction mixture containing as essential reagents, water, alkali or alkaline earth metal oxide, alumina, silica and a quaternary ammonium compound.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: June 27, 1989
    Assignee: UOP
    Inventors: Brent M. Lok, Thomas R. Cannan, Edith M. Flanigen
  • Crystalline zeolite LZ-202 and process for preparing same
    Patent number: 4840779
    Abstract: The crystalline omega-type zeolite LZ-202 can be prepared by a novel process that eliminates the prior art requirement of a templating agent. Unlike prior art omega-type zeolites, the as-synthesized form is totally ion-exchangeable and can be enriched with silicon by treatment with ammonium fluorosilicate to produce a product which is substantially crystalline.
    Type: Grant
    Filed: July 8, 1985
    Date of Patent: June 20, 1989
    Assignee: UOP
    Inventor: Thomas R. Cannan
  • Crystalline silicoaluminophosphates
    Patent number: 4440871
    Abstract: A novel class of crystalline microporous silicoaluminophosphates is synthesized by hydrothermal crystallization of silicoaluminophosphate gels containing a molecular structure-forming templating agent. The class comprises a number of distinct species, each with a unique crystal structure. The compositions exhibit properties somewhat analogous to zeolitic molecular sieves which render them useful as adsorbent or catalysts in chemical reactions such as hydrocarbon conversions.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: April 3, 1984
    Assignee: Union Carbide Corporation
    Inventors: Brent M. Lok, Celeste A. Messina, Robert L. Patton, Richard T. Gajek, Thomas R. Cannan, Edith M. Flanigen