[특허]Microbiological desulfurization of gases

Microbiological desulfurization of gases 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61L-009/01
출원번호	US-0849646 (1986-04-09)
발명자 / 주소	Sublette Kerry L. (Tulsa OK)
출원인 / 주소	Combustion Engineering, Inc. (Windsor CT 02)
인용정보	피인용 횟수 : 30 인용 특허 : 0

초록 ▼

There is disclosed a method for desulfurizing gases by microbiological techniques which involve the use of chemoautotrophic bacteria of the Thiobacillus genus to convert sulfides to sulfates either as a sulfide removal process or as a process for producing biomass. More specifically, the invention involves the use of Thiobacillus denitrificans under aerobic conditions to oxidize sulfur compounds such as hydrogen sulfide to sulfate compounds. The process may be carried out by various techniques such as in a continuous bioreactor system using an immobilization matrix. The method is particularly suited to the disposal of hydrogen sulfide which has been otherwise removed from natural gas and producing a biomass byproduct.

대표청구항 ▼

A method for treating a gas stream containing hydrogen sulfide to remove said hydrogen sulfide comprising the steps of: a. culturing T. denitrificans in the absence of H2S in a maintenance medium containing a quantity of thiosulfate to produce a desired population of T.denitrificans, thereby reducing said quantity of thiosulfate and forming a slurry of T. denitrificans in maintenance medium, b. removing any thiosulfate which may remain in said slurry, c. flowing said gas stream and oxygen through said slurry in a reactor whereby said T. denitridicans removes said hydrogen sulfide under aerobic conditions and produces sulfate and whereby said population of T. denitrificans increases to produce excess T. denitrificans, the ratio of gas stream flow to the quantity of T. denitrificans being such that the average maximum loading of H2S is no greater than 20 millimoles of H2S per hour per gram dry weight of T. denitrificans and the quantity of O2 is maintained at a level of at least 25 mT. denitrificans and sulfate, e. removing at least a portion of said excess T. denitrificans and at least a portion of said sulfate from said removed slurry thereby leaving a remaining slurry, and f. recycling said remaining slurry back to said reactor. A method for treating a gas stream containing hydrogen sulfide to remove said hydrogen sulfide comprising the steps of: a. culturing T. denitrificans in the absence of H2S in a maintenance medium containing a quantity of thiosulfate to produce a desired population of T. denitrificans, and to reduce said quantity of thiosulfate, b. removing any thiosulfate which may remain, c. immobilizing said population of T. denitrificans in immobilization matrices, d. introducing said population of T. denitrificans in said immobilization matrices into a reactor containing maintenance medium free of thiosulfate thus creating a slurry, e. flowing said gas stream and oxygen through said slurry in said reactor whereby said T. denitrificans removes said hydrogen sulfide under aerobic conditions and produces sulfate and whereby said population of T. denitrificans increases to produce excess T. denitrificans which are released from said immobilization matrices, the ratio of gas stream flow to the quantity of T. denitrificans being such that the average maximum loading of H2S is no greater than 20 millimoles of H2S per hour per gram dry weight of T. denitrificans and the quantity of O2 is maintained at a level of at least 25 mT. denitrificans and a portion of said excess T. denitrificans which have been released from said immobilization matrices and a portion of said produced sulfate and a portion of said maintenance medium, g. removing from said slurry and recycling to said reactor said immobilization matrices containing said T. denitrificans and producing a remaining slurry, h. removing said remaining slurry said excess T. denitrificans to produce a T. denitrificans biomass product and a spent maintenance medium solution containing sulfate, and i. removing at least a portion of said sulfate from said spent maintenance medium solution and recycling said spent maintenance medium solution back to said reactor.

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