Dszd utilization in desulfurization of dbt by rhodococcus...

C - Chemistry – Metallurgy – 12 – N

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C12N 15/53 (2006.01) C10G 31/00 (2006.01) C10G 32/00 (2006.01) C12N 1/21 (2006.01) C12N 9/02 (2006.01) C12P 1/00 (2006.01) C12S 1/02 (2006.01)

Patent

CA 2230823

The invention relates to the discovery that the rate of reaction of the desulfurization of fossil fuels is enhanced by the addition of an oxidoreductase to the biocatalyst. The invention is drawn to a method for enhancing the rate of desulfurizing a fossil fuel containing organic sulfur compounds, comprising the steps of: a) contacting the fossil fuel with an aqueous phase containing a biocatalyst capable of cleaving carbon-sulfur bonds and a rate-enhancing amount of an oxidoreductase, thereby forming a fossil fuel and aqueous phase mixture; b) maintaining the mixture of step (a) under conditions sufficient for cleavage of the carbon-sulfur bonds of the organic sulfur molecules by the biocatalyst, thereby resulting in a fossil fuel having a reduced organic sulfur content; and c) separating the fossil fuel having a reduced organic sulfur content from the resulting aqueous phase. The invention also relates to a recombinant microorganism containing one or more recombinant DNA molecules which encode a biocatalyst capable of desulfurizing a fossil fuel containing organic sulfur molecules and which encode an oxidoreductase. The invention also relates to a composition comprising (a) a biocatalyst capable of desulfurizing a fossil fuel containing organic sulfur molecules and (b) an oxidoreductase.

L'invention concerne la découverte du fait que la vitesse de réaction de la désulfuration des combustibles fossiles est augmentée par l'adjonction d'une oxydoréductase au biocatalyseur. Elle concerne un procédé qui permet d'augmenter la vitesse de désulfuration d'un combustible fossile contenant des composés organosulfurés, et qui comporte plusieurs étapes: a) on met en contact le combustible fossile avec une phase aqueuse contenant un biocatalyseur capable de rompre les liaisons carbone-soufre et une quantité accélératrice d'une oxydoréductase, ce qui donne un mélange de combustible fossile et de phase aqueuse; b) on maintient le mélange de l'étape (a) dans des conditions permettant au biocatalyseur de rompre les liaisons carbone-soufre des molécules organosulfurées, ce qui donne un combustible fossile ayant un taux de soufre organique réduit; c) on sépare le combustible fossile ayant un taux de soufre organique réduit de la phase aqueuse obtenue. L'invention concerne également un micro-organisme recombinant contenant une ou plusieurs molécules d'ADN recombinant qui code pour un biocatalyseur capable de désulfurer un combustible fossile contenant des molécules organosulfurées et pour une oxydoréductase. L'invention concerne enfin une composition comprenant a) un biocatalyseur capable de désulfurer un combustible fossile contenant des molécules organosulfurées et b) une oxydoréductase.

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