Microemulsion process for direct biocatalytic desulfurization of

Details Microemulsion process for direct biocatalytic desulfurization of Microemulsion process for direct biocatalytic desulfurization of

1992-06-11

1994-10-25

Naff, David M.

Chemistry: molecular biology and microbiology

Process of utilizing an enzyme or micro-organism to destroy...

Petroleum oil or shale oil treating

435195, 4352521, 4352527, 435243, 435832, 435822, C10G 3200, C12N 914, C12N 112, C12N 100

Patent

active

053588703

ABSTRACT:
A method of desulfurizing a petroleum liquid containing organosulfur molecules is disclosed. The method relies upon the use of an aqueous biocatalytic agent comprising, in preferred embodiments, a substantially cell free extract of a microorganism which functionally expresses an enzyme capable of selectively cleaving organic carbon-sulfur bonds even in sulfur-bearing heterocycles, wherein the extract contains a substantial proportion of the total activity of said enzyme expressed by the microorganism. An emulsion, preferably a microemulsion, is formed between this biocatalytic agent and the petroleum liquid. Reversible microemulsions are particularly preferred, due to facilitated recovery of a desulfurized petroleum liquid at the conclusion of treatment. The invention described is particularly well suited to the desulfurization of petroleum liquids having a high relative abundance of refractory organosulfur molecules, such as dibenzothiophene.

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