Patents by Inventor Alakananda Bhattacharyya

Alakananda Bhattacharyya 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: 5626794
    Abstract: A process for hydroshifting dimethyl ether is described which comprises passing a feed stream which includes dimethyl ether and steam to a hydroshifting reaction zone including an essentially alkali metal-free catalytic composition substantially composed of copper or nickel in elemental form. The process produces a hydroshifted product stream which is relatively rich in hydrogen, carbon monoxide, and carbon dioxide.The feed stream can be transported relatively easily in liquid form at comparatively low pressures. The hydroshifting reaction zone can include a hydrolysis reaction zone and a water-gas shift reaction zone. The hydrolyzed product and the water-gas shift product can be recovered to obtain hydrogen and carbon dioxide, respectively. Additionally, the hydroshifted product stream can be blended with an oxidizing stream and combusted to drive a turbine in order to generate mechanical energy.
    Type: Grant
    Filed: February 6, 1996
    Date of Patent: May 6, 1997
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Arunabha Basu
  • Patent number: 5614163
    Abstract: A process is disclosed for preparing a synthesis gas comprising hydrogen and carbon monoxide by partial oxidation of hydrocarbyl compounds using a source of oxygen comprising molecular oxygen, carbon dioxide, or mixtures thereof in the presence of a catalyst comprising thermally stable mixtures formed by heat treating a hydrotalcite-like compound.
    Type: Grant
    Filed: July 26, 1995
    Date of Patent: March 25, 1997
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Mark S. Kleefisch, Carl A. Udovich
  • Patent number: 5591238
    Abstract: A method and nickel-containing catalyst are disclosed for preparing synthesis gas by the reforming of a hydrocarbyl compound using an oxygen-containing compound.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: January 7, 1997
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Wen-Dong Chang, Mark S. Kleefisch, Carl A. Udovich
  • Patent number: 5591418
    Abstract: A collapsed composition is described which is substantially composed of microcrystallites collectively of the formula:m.sub.2m.sup.2+ Al.sub.2-p M.sub.p.sup.3+ T.sub.r O.sub.7+r.multidot.swhere M.sup.2+ is a divalent metal, M.sup.3+ is a trivalent metal, and T is vanadium, tungsten, or molybdenum. The microcrystallites are so small as to be undetectable through conventional x-ray diffraction techniques, yet high resolution electron microscopy reveals that a substantial portion of the microcrystallites are composed of a solid solution having aluminum oxide molecularly dispersed in a divalent metal monoxide crystal structure. Another portion of the microcrystallites are constituted by a spinel phase. The collapsed composition is suitable as a sulfur oxide absorbent, having comparatively high capacity and comparatively fast absorption and desorption rates, and is also suitable as a nitrogen oxide reduction catalyst.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: January 7, 1997
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Michael J. Foral, William J. Reagan
  • Patent number: 5498370
    Abstract: A process for hydroshifting dimethyl ether is described which comprises passing a feed stream which includes dimethyl ether and steam to a hydroshifting reaction zone including an essentially alkali metal-free catalytic composition substantially composed of copper or nickel in elemental form. The process produces a hydroshifted product stream which is relatively rich in hydrogen, carbon monoxide, and carbon dioxide.The feed stream can be transported relatively easily in liquid form at comparatively low pressures. The hydroshifting reaction zone can include a hydrolysis reaction zone and a water-gas shift reaction zone. The hydrolyzed product and the water-gas shift product can be recovered to obtain hydrogen and carbon dioxide, respectively. Additionally, the hydroshifted product stream can be blended with an oxidizing stream and combusted to drive a turbine in order to generate mechanical energy.
    Type: Grant
    Filed: December 15, 1994
    Date of Patent: March 12, 1996
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Arunabha Basu
  • Patent number: 5439861
    Abstract: A process is disclosed for preparing a synthesis gas comprising hydrogen and carbon monoxide by partial oxidation of hydrocarbyl compounds using a source of oxygen comprising molecular oxygen, carbon dioxide, or mixtures thereof in the presence of a catalyst comprising thermally stable mixtures formed by heat treating a hydrotalcite-like compound.
    Type: Grant
    Filed: April 16, 1993
    Date of Patent: August 8, 1995
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Mark S. Kleefisch, Carl A. Udovich
  • Patent number: 5426083
    Abstract: A collapsed composition is described which is substantially composed of microcrystallites collectively of the formula:M.sub.2m.sup.2+ Al.sub.2-p M.sub.p.sup.3+ T.sub.r O.sub.7+r.swhere M.sup.2+ is a divalent metal, M.sup.3+ is a trivalent metal, and T is vanadium, tungsten, or molybdenum.The microcrystallites are so small as to be undetectable through conventional x-ray diffraction techniques, yet high resolution electron microscopy reveals that a substantial portion of the microcrystallites are composed of a solid solution having aluminum oxide molecularly dispersed in a divalent metal monoxide crystal structure. Another portion of the microcrystallites are constituted by a spinel phase. The collapsed composition is suitable as a sulfur oxide absorbent, having comparatively high capacity and comparatively fast absorption and desorption rates. The collapsed composition may be produced by heat treating a layered mixed hydroxide clay having interlayer anions in monometalate form.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: June 20, 1995
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Michael J. Foral, William J. Reagan
  • Patent number: 5399537
    Abstract: A method and nickel-containing catalyst are disposed for preparing synthesis gas by the reforming of a hydrocarbyl compound using an oxygen-containing compound.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: March 21, 1995
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Wen-Dong Chang, Mark S. Kleefisch, Carl A. Udovich
  • Patent number: 5354932
    Abstract: A catalytic process for the conversion of hydrocarbons is described. Catalyst in this improved process is made by thermally activating a hydrotalcite-type clay of formula:M.sup.2+.sub.2x M.sup.3+.sub.2 (OH).sub.4x+4 A.sup.n-.sub.2/n.ZH.sub.2 Owhere M.sup.2+ is one or more metal ion selected from the group consisting of Mg.sup.2+, Zn.sup.2+ Cu.sup.2+, Ni.sup.2+, Co.sup.2+, Mn.sup.2+ and Fe.sup.2+ and M.sup.3+ is one or more metal ion selected from the group consisting of Al.sup.3+, Fe.sup.3+, Co.sup.3+, Mn.sup.3+ and Cr.sup.3+, x runs between 1.5 and 5, A is one or more anions selected from the group consisting of B(OH).sub.4.sup.-, [B.sub.3 O.sub.3 (OH).sub.4 ].sup.-, V.sub.2 O.sub.7.sup.4-, V.sub.4 O.sub.12.sup.4-, and V.sub.3 O.sub.9.sup.3-, n is 1, 3 or 4, and Z runs between 0 and about 4. These hydrotalcite-type clays have an X-ray diffraction d(001) value greater than about 7.7 Angstroms.
    Type: Grant
    Filed: July 19, 1993
    Date of Patent: October 11, 1994
    Assignee: Amoco Corporation
    Inventors: Alakananda Bhattacharyya, Mark P. Kaminsky
  • Patent number: 5246899
    Abstract: A direct and simplified process is described for making anionic clays having the hydrotalcite structure which contain as the intercalating anion a pH-dependent, essentially carbonate-free, inorganic anion. Hydrotalcite-type clays made by the process from a number of divalent and trivalent metal ions and pH-dependent, boron-containing anions and transition element metalates are useful in the conversion of hydrocarbons.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: September 21, 1993
    Assignee: Amoco Corporation
    Inventor: Alakananda Bhattacharyya
  • Patent number: 4963520
    Abstract: A composition of matter comprising at least one metal-containing spinel which includes a first metal and a second metal having a valence higher than the valence of the first metal, a minor amount of at least one-third metal component effective to promote the oxidation of sulfur dioxide to sulfur trioxide at sulfur dioxide oxidation conditions, and a minor amount of at least one-fourth metal component effective to promote the reduction of first metal sulfate at first metal sulfate reduction conditions. These compositions are useful, e.g., in hydrocarbon conversion processes, to reduce sulfur oxide and/or nitrogen oxide atmospheric emissions.
    Type: Grant
    Filed: August 1, 1988
    Date of Patent: October 16, 1990
    Assignee: UOP
    Inventors: Jin S. Yoo, Cecelia A. Radlowski, John A. Karch, Alakananda Bhattacharyya
  • Patent number: 4957718
    Abstract: A process for the removal of sulfur oxides from a gas which comprises (a) contacting the sulfur oxide-containing gas with at least one of certain metal, oxygen-containing components, e.g., modified perovskite-type components, at conditions effective to associate at least a portion of the sulfur oxides with the component to reduce the amount of sulfur oxides in the gas; and (b) contacting the component containing associated sulfur oxides at conditions effective to reduce the amount of sulfur associated with the component.
    Type: Grant
    Filed: November 24, 1987
    Date of Patent: September 18, 1990
    Assignee: UOP
    Inventors: Jin S. Yoo, John A. Karch, Alakananda A. Bhattacharyya, Cecelia A. Radlowski
  • Patent number: 4830840
    Abstract: A process for the production of an alkaline earth metal, aluminum-containing spinel/clay composition comprises: (a) combining (1) an acidic, aluminum-containing composition in which the aluminum is present in a positively charged species, and (2) a basic, alkaline earth metal-containing composition to form a gel mixture; (b) mixing the gel with kaolin clay to form a co-gel; and (c) calcining the co-gel mixture to form the alkaline earth metal, aluminum-containing spinel composition in a clay matrix. Alkaline earth metal, aluminum-containing spinel/clays having both high surface areas and very high attrition resistance, and processes for using spinel/clay compositions, e.g., as sulfur oxide and nitrogen oxide removal agent, are also disclosed.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: May 16, 1989
    Assignee: UOP
    Inventor: Alakananda Bhattacharyya
  • Patent number: 4790982
    Abstract: A composition of matter comprising at least one metal-containing spinel which includes a first metal and a second metal having a valence higher than the valence of the first metal, a minor amount of at least one third metal component effective to promote the oxidation of sulfur dioxide to sulfur trioxide at sulfur dioxide oxidation conditions, and a minor amount of at least one fourth metal component effective to promote the reduction of first metal sulfate at first metal sulfate reduction conditions. These compositions are useful, e.g., in hydrocarbon conversion processes, to reduce sulfur oxide and/or nitrogen oxide atmospheric emissions.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: December 13, 1988
    Assignee: Katalistiks International, Inc.
    Inventors: Jin S. Yoo, Cecelia A. Radlowski, John A. Karch, Alakananda Bhattacharyya
  • Patent number: 4496532
    Abstract: The invention provides the novel ruthenium carbonylate anions [Ru.sub.4 (CO).sub.11 ].sup.6- and [Ru.sub.6 (CO).sub.17 ].sup.4- and [Ru.sub.6 (CO).sub.16 ].sup.6-, together with the salts and acids of these anions. The former anion can be prepared by reduction of either Ru.sub.3 (CO).sub.12 or [Ru.sub.4 (CO).sub.12 ].sup.4- with controlled amounts of an alkali metal in the presence of an electron carrier compound, while the latter two anions are prepared by a similar reduction of [Ru.sub.6 (CO).sub.18 ].sup.2-. [Ru.sub.6 (CO).sub.16 ].sup.6- can also be prepared by a similar reduction of [Ru.sub.6 (CO).sub.17 ].sup.4-.
    Type: Grant
    Filed: July 27, 1983
    Date of Patent: January 29, 1985
    Assignee: The Ohio State University Research Foundation
    Inventors: Sheldon G. Shore, Alakananda Bhattacharyya