Patents by Inventor Keshav C. Das

Keshav C. Das 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: 9175235
    Abstract: A bio-oil production process involving torrefaction pretreatment, catalytic esterification, pyrolysis, and secondary catalytic processing significantly reduces yields of reactor char, catalyst coke, and catalyst tar relative to the best-case conditions using non-torrefied feedstock. The reduction in coke as a result of torrefaction was 28.5% relative to the respective control for slow pyrolysis bio-oil upgrading. In fast pyrolysis bio-oil processing, the greatest reduction in coke was 34.9%. Torrefaction at 275° C. reduced levels of acid products including acetic acid and formic acid in the bio-oil, which reduced catalyst coking and increased catalyst effectiveness and aromatic hydrocarbon yields in the upgraded oils. The process of bio-oil generation further comprises a catalytic esterification of acids and aldehydes to generate such as ethyl levulinate from lignified biomass feedstock.
    Type: Grant
    Filed: November 14, 2013
    Date of Patent: November 3, 2015
    Assignee: UNIVERSITY OF GEORGIA RESEARCH FOUNDATION, INC.
    Inventors: James R. Kastner, Sudhagar Mani, Roger Hilten, Keshav C. Das
  • Publication number: 20140130402
    Abstract: A bio-oil production process involving torrefaction pretreatment, catalytic esterification, pyrolysis, and secondary catalytic processing significantly reduces yields of reactor char, catalyst coke, and catalyst tar relative to the best-case conditions using non-torrefied feedstock. The reduction in coke as a result of torrefaction was 28.5% relative to the respective control for slow pyrolysis bio-oil upgrading. In fast pyrolysis bio-oil processing, the greatest reduction in coke was 34.9%. Torrefaction at 275° C. reduced levels of acid products including acetic acid and formic acid in the bio-oil, which reduced catalyst coking and increased catalyst effectiveness and aromatic hydrocarbon yields in the upgraded oils. The process of bio-oil generation further comprises a catalytic esterification of acids and aldehydes to generate such as ethyl levulinate from lignified biomass feedstock.
    Type: Application
    Filed: November 14, 2013
    Publication date: May 15, 2014
    Inventors: James R. Kastner, Sudhagar Mani, Roger Hilten, Keshav C. Das
  • Patent number: 8722389
    Abstract: A system and method for culturing algae are presented. The system and method utilize a fog of growth medium that is delivered to an algal mat generator along with a stream of CO2 to promote growth of algal cells contained in the generator.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: May 13, 2014
    Assignee: U.S. Department of Energy
    Inventors: Keshav C. Das, Benjamin R. Cannon, Ashish Bhatnagar, Senthil Chinnasamy
  • Patent number: 8656636
    Abstract: The present disclosure relates to biological optimization systems for enhancing photosynthetic efficiency and methods of use.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: February 25, 2014
    Assignee: University of Georgia Research Foundation, Inc.
    Inventors: Ryan W. Hunt, Senthil Chinnasamy, Keshav C. Das, Erico Rolim de Mattos
  • Publication number: 20130244309
    Abstract: The present disclosure includes algal floway (AGF) systems for continuous, specific, economical, and efficient harvesting of algae biomass.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 19, 2013
    Applicant: University of Georgia Research Foundation, Inc.
    Inventors: Manjinder Singh, Keshav C. Das
  • Patent number: 8302346
    Abstract: Biological optimization systems for enhancing photosynthetic efficiency and methods of use. Specifically, methods for enhancing photosynthetic efficiency including applying pulsed light to a photosynthetic organism, using a chlorophyll fluorescence feedback control system to determine one or more photosynthetic efficiency parameters, and adjusting one or more of the photosynthetic efficiency parameters to drive the photosynthesis by the delivery of an amount of light to optimize light absorption of the photosynthetic organism while providing enough dark time between light pulses to prevent oversaturation of the chlorophyll reaction centers are disclosed.
    Type: Grant
    Filed: January 26, 2011
    Date of Patent: November 6, 2012
    Assignee: University of Georgia Research Foundation, Inc.
    Inventors: Ryan W. Hunt, Senthil Chinnasamy, Keshav C. Das, Erico Rolim de Mattos
  • Publication number: 20120237994
    Abstract: Embodiments of the present disclosure provide for biochar impregnated with microbes, methods of making biochar impregnated with microbes, methods of using biochar impregnated with microbes, methods of using biochar to produce gas, reactors using biochar and/or biochar impregnated with microbes, methods of using the reactors, and the like.
    Type: Application
    Filed: August 12, 2010
    Publication date: September 20, 2012
    Applicant: University of Georia Research Foundation, Inc.
    Inventors: Keshav C. Das, Nagamani Balagurusamy, Senthil Chinnasamy
  • Patent number: 8252561
    Abstract: Embodiments of the present disclosure provide for novel strategies to harvest algal lipids using mollusks which after feeding algae from the growth medium can convert algal lipids into their biomass or excrete lipids in their pseudofeces which makes algae harvesting energy efficient and cost effective. The bioconverter, filter-feeding mollusks and their pseudofeces can be harvested and converted to biocrude using an advanced thermochemical liquefaction technology. Methods, systems, and materials are disclosed for the harvest and isolation of algal lipids from the mollusks, molluscan feces and molluscan pseudofeces.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: August 28, 2012
    Assignee: University of Georgia Research Foundation, Inc.
    Inventors: Keshav C. Das, Senthil Chinnasamy, James Shelton, Susan B. Wilde, Rebecca S. Haynie, James A. Herrin
  • Publication number: 20120028338
    Abstract: The disclosure encompasses, among other aspects, mixed algal populations able to survive and proliferate on culture media that have a high proportion of an industry wastewater. In particular, at least one strain of an alga in the algal population proliferates mixotrophically. Embodiments further encompass methods of cultivating mixed populations of freshwater and marine alga comprising a plurality of genera and species to provide a biomass from which may be extracted lipids, or converted into biodiesel by such procedures as pyrolysis. Lipid material extracted from the algae may be converted to biodiesel or other organic products. Native algal strains were isolated from industrial and in particular agricultural wastewater inoculated with mixed populations derived from environments exposed to such wastewater. Both fresh water and marine algae showed good growth in wastewaters. About 65% of the algal oil obtained from the algal consortium cultured on an industry wastewater could be converted into biodiesel.
    Type: Application
    Filed: April 20, 2010
    Publication date: February 2, 2012
    Inventors: Ashish Bhatnagar, Senthil Chinnasamy, Keshav C. Das
  • Publication number: 20110179706
    Abstract: The present disclosure relates to biological optimization systems for enhancing photosynthetic efficiency and methods of use.
    Type: Application
    Filed: January 26, 2011
    Publication date: July 28, 2011
    Inventors: Ryan W. Hunt, Senthil Chinnasamy, Keshav C. Das, Erico Rolim de Mattos
  • Publication number: 20110045556
    Abstract: Embodiments of the present disclosure provide for novel strategies to harvest algal lipids using mollusks which after feeding algae from the growth medium can convert algal lipids into their biomass or excrete lipids in their pseudofeces which makes algae harvesting energy efficient and cost effective. The bioconverter, filter-feeding mollusks and their pseudofeces can be harvested and converted to biocrude using an advanced thermochemical liquefaction technology. Methods, systems, and materials are disclosed for the harvest and isolation of algal lipids from the mollusks, molluscan feces and molluscan pseudofeces.
    Type: Application
    Filed: August 24, 2010
    Publication date: February 24, 2011
    Inventors: Keshav C. Das, Senthil Chinnasamy, James Shelton, Susan B. Wilde, Rebecca S. Haynie, James A. Herrin
  • Publication number: 20100267122
    Abstract: The disclosure encompasses, among other aspects, mixed algal populations able to survive and proliferate on culture media that have a high proportion of carpet industry wastewater. Embodiments further encompass methods of cultivating mixed populations of freshwater and marine alga comprising a plurality of genera and species to provide a biomass from which may be extracted lipids, or converted into biodiesel by such procedures as pyrolysis. Lipid material extracted from the algae may be converted to biodiesel or other organic products. A combined stream of carpet industry untreated wastewater with 10-15% sewage was found to be a good growth medium for cultivation of microalgae and biodiesel production. Native algal strains were isolated from carpet wastewater inoculated with mixed populations derived from environments exposed to such wastewater. Both fresh water and marine algae showed good growth in wastewaters.
    Type: Application
    Filed: April 8, 2010
    Publication date: October 21, 2010
    Inventors: Senthil Chinnasamy, Ashish Bhatnagar, Ryan W. Hunt, Ronald Claxton, Mark Marlowe, Keshav C. Das