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Ramesh Varadaraj, Cornelius H Brons, Jan Bock, Stanley J Brois: Surfactant-nutrients for bioremediation of hydrocarbon contaminated soils and water. Exxon Research and Engineering Company, Joseph J Dvorak, May 7, 1996: US05514588 (40 worldwide citation)

The present invention provides for enhanced bioremediation of hydrocarbon contaminated soils and waters by treating soil or water with a composition comprising a phosphorous source, a diluent and a compound or mixtures thereof represented by the structural formula: ##STR1## wherein R is a linear or ...


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Ramesh Varadaraj, David William Savage, William Edward Wales: Removal of naphthenic acids in crude oils and distillates. Exxon Research and Engineering Co, Estelle C Bakun, October 5, 1999: US05961821 (30 worldwide citation)

The instant invention is directed to a process for extracting organic acids including naphthenic acids, heavy metals, and sulfur from a starting crude oil comprising the steps of:


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Irwin A Wiehe, Ramesh Varadaraj, Torris G Jermansen, Raymond J Kennedy, Cornelius H Brons: Branched alkyl-aromatic sulfonic acid dispersants for solublizing asphaltenes in petroleum oils. Exxon Research and Engineering Co, Ronald D Hantman, April 11, 2000: US06048904 (29 worldwide citation)

The present invention is an asphaltene dispersant containing an aromatic, a sulfonic acid head, and an alkyl tail containing 16 carbons or more and at least one branch of a methyl or longer alkyl. Preferably, the aromatic is a fused two ring aromatic and the tail is a two, branched alkyl tail of 30 ...


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Ramesh Varadaraj, James R Bragg, Dennis G Peiffer, Chester W Elspass: Stability enhanced water-in-oil emulsion and method for using same. ExxonMobil Upstream Research Company, ExxonMobil Upstream Research Co Law Department, March 6, 2007: US07186673 (26 worldwide citation)

A method for enhancing the stability of a water-in-oil emulsion pretreating at least a portion of the oil prior to emulsification. The pretreatment step may consist of adding polymers to the oil, biotreating the oil, photochemically treating the oil, or combinations thereof. The emulsion may be used ...


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Ramesh Varadaraj, Thomas M Pugel, David W Savage: Removal of naphthenic acids in crude oils and distillates. Exxon Research and Engineering Co, Estelle C Bakun, August 1, 2000: US06096196 (25 worldwide citation)

The instant invention is directed a process for extracting organic acids from a starting crude oil comprising the steps of: (a) treating the starting crude oil containing naphthenic acids with an amount of an alkoxylated amine and water under conditions and for a time and at a temperature sufficient ...


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Ramesh Varadaraj: Mineral acid enhanced thermal treatment for viscosity reduction of oils (ECB-0002). ExxonMobil Upstream Research Company, Phillip G Woo, Douglas J Collins, October 5, 2004: US06800193 (22 worldwide citation)

The invention describes a method for decreasing the viscosity of crude oils and residuum utilizing a combination of thermal and acidic treatment. Further, the invention describes a method for making a water-in-oil emulsion, or a solids-stabilized water-in-oil emulsion with a reduced viscosity. The e ...


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Ramesh Varadaraj: Viscosity reduction of oils by sonic treatment. ExxonMobile Research and Engineering Co, Linda M Scuorzo, Ramesh Varadaraj, April 8, 2003: US06544411 (21 worldwide citation)

The invention describes a method for decreasing the viscosity of crude oils and residuum utilizing a combination of acid and sonic treatment.


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Ramesh Varadaraj, James R Bragg, Monte K Dobson, Dennis G Peiffer, John S Huang, Donald B Siano, Cornelius H Brons, Chester W Elspass: Solids-stabilized water-in-oil emulsion and method for using same. ExxonMobil Upstream Research Company, Phillip Weo, Doug Collins, May 11, 2004: US06734144 (21 worldwide citation)

A method for enhancing the stability of a solids-stabilized water-in-oil emulsion by pretreating the oil prior to emulsification. The pretreatment step can be accomplished by adding dilute acid to the oil, adding a lignosulfonate additive to the oil, sulfonating the oil, thermally oxidizing the oil, ...


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Cornelius H Brons, Jan Bock, Ramesh Varadaraj, Stanley J Brois: Class of bifunctional additives for bioremediation of hydrocarbon contaminated soils and water. Exxon Research & Engineering Co, Joseph J Dvorak, April 2, 1996: US05503774 (19 worldwide citation)

The present invention provides for enhanced bioremediation of hydrocarbon contaminated soils and waters by treating soil or water with a surfactant or mixture of surfactants having the general formulae: ##STR1## wherein A=CH.sub.2, B=CH.sub.2 CH.sub.2 O, x=1-10 and y=2-20.


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