Method of removing tar-forming gases from CVD/CVI furnace effluent
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B01D-053/72
B01D-053/46
C01B-031/30
C01B-031/00
출원번호
US-0832672
(2004-04-27)
등록번호
US-7285257
(2007-10-23)
발명자
/ 주소
Walker,Terence B.
Shumaker,Craig B.
출원인 / 주소
Honeywell International Inc.
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
1인용 특허 :
11
초록▼
Method for removing tar-forming hydrocarbons from an effluent gas mixtures from Chemical Vapor Deposition or Chemical Vapor Infiltration processes. Method includes passing at elevated temperature effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons through a bed
Method for removing tar-forming hydrocarbons from an effluent gas mixtures from Chemical Vapor Deposition or Chemical Vapor Infiltration processes. Method includes passing at elevated temperature effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons through a bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons in the effluent gas mixture. Apparatus including a de-tarring vessel (5) having a packed bed (7, 8, 9) of iron or iron oxide pellets (1) resting over a perforated distributor plate (2) and having an exhaust port (12), said de-tarring vessel being operatively linked via an exhaust port (6) to a CVI or CVD reactor vessel.
대표청구항▼
What is claimed is: 1. A process for removing tar-forming hydrocarbons from an effluent gas mixture which comprises the step of passing at an elevated temperature an effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons, wherein said gas mixture is an effluent fr
What is claimed is: 1. A process for removing tar-forming hydrocarbons from an effluent gas mixture which comprises the step of passing at an elevated temperature an effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons, wherein said gas mixture is an effluent from a Chemical Vapor Deposition process or from a Chemical Vapor Infiltration process, through a first bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons in said gas mixture. 2. The process of claim 1, wherein said Chemical Vapor Deposition (CVD) process or Chemical Vapor Infiltration (CVI) process deposits carbon in a fibrous matrix. 3. The process of claim 2, wherein said fibrous matrix comprises pitch and/or polyacrylonitrile derived carbon fibers. 4. The process of claim 3, wherein the carbonized fibrous matrix is a carbon-carbon composite configured as an aircraft brake disc. 5. The process of claim 1, comprising the further step of passing, at an elevated temperature, the gas mixture in which tar-forming high molecular weight hydrocarbons have been decomposed through a second bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons remaining in said gas mixture. 6. The process of claim 5, wherein said first bed is located inside the CVI reactor, between the carbon-carbon working zone and the exhaust port. 7. The process of claim 1, wherein said elevated temperature is in the range 4000째 C. through 11000째 C. 8. The process of claim 7, wherein said elevated temperature is approximately 6000째 C. 9. The process of claim 1, wherein said gas mixture contains 25 or less weight-% hydrogen, 50 or less weight-% methane, and 3 to 30 weight-% tar-forming high molecular weight hydrocarbons. 10. The process of claim 9, wherein the ratio of hydrogen gas to carbon in said gas mixture ranges from 2:1 through 5:1. 11. The process of claim 1, wherein said iron pellets comprise iron oxide or metallic iron. 12. The process of claim 11, wherein the diameters of said iron pellets range from 1 to 10 centimeters. 13. The process of claim 12, wherein the diameters of said iron pellets range from 1 to 4 centimeters. 14. A process which comprises the steps of: providing a fibrous matrix that comprises pitch and/or polyacrylonitrile derived carbon fibers; subjecting said fibrous matrix to Chemical Vapor Deposition (CVD) or Chemical Vapor Infiltration (CVI) to deposit carbon in said fibrous matrix by passing a gas mixture through said fibrous matrix, and recovering an effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons from the CVD/CVI processing; and passing the effluent gas mixture at an elevated temperature through a first bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons in said gas mixture. 15. A process which comprises the steps of: providing a fibrous matrix that comprises pitch and/or polyacrylonitrile derived carbon fibers; subjecting said fibrous matrix to Chemical Vapor Deposition (CVD) or Chemical Vapor Infiltration (CVI) to deposit carbon in said fibrous matrix by passing a gas mixture through said fibrous matrix, and recovering an effluent gas mixture containing hydrogen, methane, and high molecular weight hydrocarbons from the CVD/CVI processing; passing the effluent gas mixture at an elevated temperature through a first bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons in said gas mixture; and passing, at an elevated temperature, the gas mixture in which tar-forming high molecular weight hydrocarbons have been decomposed through a second bed that contains iron pellets, thereby decomposing tar-forming high molecular weight hydrocarbons remaining in said gas mixture.
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이 특허에 인용된 특허 (11)
Hiromu Shishido JP; Norio Omoda JP, Apparatus and method for resource recovery from organic substance.
Stephens ; Jr. Frank M. (Lakewood CO) Hager John P. (Golden CO) Stephens Frank A. (Arvada CO), Process for preheating iron-containing reactor feed prior to being treated in a fluidized bed reactor.
Frank M. Stephens, Jr. ; Frank A. Stephens ; Robert F. Hogsett ; John P. Hager, Process for the production of iron carbide from iron oxide using external sources of carbon monoxide.
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