Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Reexamination Certificate
1999-06-30
2001-01-30
Mayekar, Kishor (Department: 1741)
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
Reexamination Certificate
active
06180066
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to the manufacture of methanol, and more particularly to a method of and apparatus for manufacturing methanol from methane.
BACKGROUND AND SUMMARY OF THE INVENTION
Methanol, the simplest of the alcohols, is a highly desirable substance which is useful as a fuel, as a solvent, and as a feedstock in the manufacture of more complex hydrocarbons. In accordance with the method of methanol manufacture that is currently practiced in the petroleum industry, methane is first converted to synthesis gas, a mixture of carbon monoxide and hydrogen. The synthesis gas is then converted over an alumina based catalyst to methanol. The formation of synthesis gas from methane is an expensive process.
As will be apparent, methane and methanol are closely related chemically. Methane comprises a major component of a natural gas and is therefore readily available. Despite the advantages inherent in producing methanol directly from methane, no commercially valuable system for doing so has heretofore been developed.
The present invention comprises a method of and apparatus for manufacturing methanol which overcomes the foregoing and other deficiencies which have long since characterized the prior art. In accordance with the broader aspects of the invention, there is generated a stream of sub-micron sized methane bubbles. Due to their extremely small size, the methane bubbles have an extremely large surface area which increases reaction efficiency. The methane bubbles are entrained in flowing water. Ultraviolet energy interacting with a titanium-based catalyst forms hydroxyl radicals which cleave the carbon-hydrogen bonds in the methane to form methyl radicals. The methyl radicals combine with the hydroxyl radicals to form methanol.
In accordance with more specific aspects of the invention, a sintered stainless steel tube has an exterior coating comprising a titanium-based catalyst. The stainless steel tube is positioned within a glass tube, and water is caused to continuously flow through the annular space between the two tubes. Methane is directed into the interior of the sintered stainless steel tube and is maintained at a pressure just high enough to prevent the flow of water into the stainless steel tube. As the water passes over the stainless steel tube, methane bubbles are continually stripped off of the sintered surface. The methane bubbles thus generated are sub-micron in size and then therefore present an extremely large surface area.
Ultraviolet light energy generated from ultra violet lamps is directed through the glass tube and engages the titanium-based catalyst to generate hydroxyl radicals in the flowing water. The hydroxyl radicals cleave the carbon-hydrogen bonds in the methane forming either molecules of hydrogen or molecules of water and methyl radicals. The methyl radicals combine with the hydroxyl radicals to form methanol. Subsequently, the methanol is separated from the water and the other products of the reaction by distillation.
REFERENCES:
patent: 3773659 (1973-11-01), Carlson et al.
patent: 4069147 (1978-01-01), Abrams et al.
patent: 4132637 (1979-01-01), Key et al.
patent: 4287070 (1981-09-01), Pollack
patent: 4624791 (1986-11-01), Ferriss
patent: 4861471 (1989-08-01), Nakao et al.
patent: 4888101 (1989-12-01), Cooper
patent: 4966759 (1990-10-01), Robertson et al.
patent: 4968429 (1990-11-01), Yen
patent: 5156173 (1992-10-01), Keyser et al.
patent: 5254253 (1993-10-01), Behmann
patent: 5271810 (1993-12-01), Keyser et al.
patent: 5316682 (1994-05-01), Keyser et al.
patent: 5510544 (1996-04-01), Keyser
patent: 5529701 (1996-06-01), Grisham et al.
patent: 5531904 (1996-07-01), Grisham et al.
patent: 5658458 (1997-08-01), Keyser et al.
patent: 5662811 (1997-09-01), Grisham et al.
patent: 5708246 (1998-01-01), Camaiom et al.
Article titled “Platinum Catalysts for the High-Yield Oxidation of Methane to a Methanol Derivative” by Roy A. Periana dated May 24, 1998 published in Science vol. 280, pp 560-564.
Article titled “Progress Report: Investigation of the Partial Oxidation of Methane to Methanol in a Simulated Countercurrent Moving Bed Reactor” by the National Center for Environmental Research and Quality Assurance.
Article titled “Photocatalytic Degradation of 2-Chlorophenol in T102 Aqueous Suspension: Modeling of Reaction Rate” by L. Rideh published 1997 in American Chemical Society. month unknown.
Article titled “Photocatalytic Degradation of Water Organic Pollutants. Kinetic Modeling and Energy Efficiency” by B. Serrano published 1997 in American Chemical Society. month unknown.
Artile titled “Simplified MOdeling of RAdiant Fields in Heterogeneous Photoreactors.1.Case of Zero Reflectance” by Alberto Brucato published 1997 in American Chemical Society. month unknown.
Article titled “Cylindrical Photocatalytic Reactors, Radiation Absorption and Scattering Effects Produced by Suspended Fine Particle in an Annular Space” by Roberto L. Romero published 1997 in American Chemical Society. month unknown.
Article titled “Efficient photo-assisted Fenton catalysis mediated by Feions on Nafion membranes active in the abatement of non-biodegradable zao-dye” by Javier Fernandez published 1998 in Chemical Commun. month unknown.
Article titled “Kinetic Analysis of the Photocatalytic Degradation of Gas-Phase 2-propanol under Mass Transport Limited Conditions with a T102 Film Photocatalyst” by Yoshihisa Ohko published 1998 in the J. Physi. Chem. month unknown.
Article titled “Time-Dependent Behavior of Active Oxygen Species Formed on Photoirradiated T102 Films in Air” by Ken-ichi-Ishibashi published Mar. 19, 1998 in vol. 102, No. 12 of the Journal of Physical Chemistry B.
Article titled “Kinetics of PhotocatalyticReactions under extremely Low Intensity UV Illumination on Titanium Dioxide Thin Films” by Yoshihisa Ohko published 1997 in J. Phys. Chem. A. month unknown.
Article titled “Preparation of a New Nanostructured T102 Surface Using a Two-Dimensional Array-Based Template” by Sachiko Matsushita published 1997 in The Chemical Society of Japan. month unknown.
Articel titled “Electronic Structure of Discrete Pseudotetrahedral Oxovanadium Centers Dispersed in a Silica Xerogel Matrix: Implications for Catalysis and Photocatalysis” by Kim Tran published 1995 in American Chemical Journal. month unknown.
Article titled “Water Purification by Semiconductor Photocatalysis” by Andrew Mills published 1993 in Chemical Society Reviews. month unknown.
Article titled “Low-Temperature Nonoxidative Activation of Methane over H-Galloaluminsilicate (MF1) Zeolite” by Vasant R. Choudhary published Feb. 1997 by the American Association for the Advancement of Science.
Article titled “Semiconductor Photocatalysis” by Claire Jones found on the Internet at www.warwick.ac.uk/~msrjn/fsemic.html. date unknown.
Article titled “Factors Affecting Photocatalysis on Mesoporous Titanium Dioxide” by Victor Frank Stone, Jr., dated 1997 found on the Internet at www.che.ufl.edu/meeting/1997/annual/session/275/y/index.html. date unknown.
Artile titled “Solar Chemical Process Engineering” found on the Internet at http://chemengineer.tqn.com/library/weekly/aa063097.htm. date unknown.
Article titled “Titanium Dioxide Photocatalysis: Developing Remediation Technology for Multiple Wastes” by Tricia Drobar found on the Internet at http://geology.wright.edu/geology/cgwm/iris/waterline/page9.html. date unknown.
Article titled “Photochemical Treatment of Pollutants” found on the Internet at http://www.nrel.gov/research/industrialtech/pollution.html. date unknown.
Article titled “Though a glass, not so darkly” found on the Intrenet at http://ci.mond.org/9518/951811.html. date unknown.
Article titled “Green Technology for the 21st Century Photocatalysts” found on the Internet at http://www.engr.wisc.edu/interd/wep.photocatalysts.html. date unknown.
GRT, Inc.
Mayekar Kishor
O'Neil Michael A.
LandOfFree
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