[특허]Split stream methanation process

[미국특허] Split stream methanation process 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C10K-003/04 C10J-003/00
출원번호	US-0971815 (1978-12-21)
발명자 / 주소	Cheung Harry (Buffalo NY)
출원인 / 주소	Union Carbide Corporation (New York NY 02)
인용정보	피인용 횟수 : 50 인용 특허 : 3

초록 ▼

A synthesis gas stream having a H2/CO ratio of less than 3/1 is split, with one stream being subjected to water gas shift essentially to completion, adjusted with a portion of the other stream to a carbon monoxide content of about 3-6% by volume, and reacted in an adiabatic methanation zone. The high hydrogen composition and high H2/CO ratio of the stream passed to the adiabatic zone is effectively regulated in this manner, preventing carbon formation and catalyst sintering. The effluent from said adiabatic zone is mixed with the remaining portion of the other stream and passed to an isothermal methanation zone. Carbon dioxide can be removed from the product methane-rich gas or from the methanation feed gas. In preferred embodiment, high pressure superheated steam is simultaneously produced by utilization of the heat of reaction of the methanation operations, enhancing the overall efficiency of the synthesis gas production-methanation operation.

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An improved process for the methanation of synthesis gas comprising: (a) dividing a synthesis gas stream containing hydrogen and carbon monoxide and having an H2/CO ratio of less than 3/1 into two separate processing streams; (b) reacting the first of said separate processing streams essentially to completion with steam in a water gas shift zone, thereby producing a converted gas stream containing carbon dioxide and hydrogen; (c) adding a portion of the second, unconverted, separate processing stream to said converted gas stream to produce an adjusted gas stream having a carbon monoxide content of from about 3% to about 6% by volume, said adjusted gas stream having a high H2/CO ratio in excess of 3/1 and a high hydrogen content; (d) adiabatically reacting said adjusted gas stream in a high temperature adiabatic reaction zone to form an effluent gas stream containing methane, excess hydrogen and steam, said effluent gas stream having a temperature on the order of about 1000°F.; (e) cooling said effluent gas stream from the adiabatic reaction zone by passing said stream in heat exchange with high pressure steam, said effluent gas stream being cooled to from about 500°F. to about 850°F. and thereby producing high pressure superheated steam; (f) mixing said cooled effluent gas stream and the remaining portion of said second, unconverted, separate processing stream to form a reaction mixture having a H2/CO ratio on the order of 3/1; (g) passing said reaction mixture to an isothermal methanation zone maintained at a methanation temperature of from about 500°F. to about 850°F., essentially all of the carbon monoxide present in said reaction zone being converted to methane; and (h) cooling the methane-rich effluent gas stream from said isothermal zone in a condensation zone to condense water therefrom, whereby methane can be produced without undesired catalyst sintering and carbon deposition in the high temperature adiabatic reaction zone, said CO adjustment enabling the CO concentration in said reaction zone to be readily maintained in continuous production operations despite variations in the CO output of the shift zone as a result of catalyst aging and/or fluctuations in the feed gas stream to said shift zone, the high hydrogen to carbon monoxide ratio serving also to drive the adiabatic methanation reaction to near completion and obviating the need for extensive recycle of the effluent from the adiabatic methanation zone, the production of high pressure superheated steam enhancing the efficiency of the overall synthesis gas-methanation production operation.

이 특허에 인용된 특허 (3) 인용/피인용 타임라인 분석

Moller Friedrich-Wilhelm (Friedrichsdorf DT) Bratzler Karl (Bad Homburg DT) Muller Wolf-Dieter (Nieder-Eschbach DT), Process for producing a gas which can be substituted for natural gas.
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White Gerald A. (Los Angeles CA) Roszkowski Theodore R. (Malibu CA), Process for the production of substitute natural gas.
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McRobbie ; Henry W., Serial adiabatic methanation and steam reforming.
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이 특허를 인용한 특허 (50) 인용/피인용 타임라인 분석

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Rappas, Alkis S.; Salem, George Frederick; Hippo, Edwin J., Catalyst-loaded coal compositions, methods of making and use.
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Raman, Pattabhi K.; Yee, Nelson, Catalytic gasification particulate compositions.
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Nahas, Nicholas Charles, Catalytic steam gasification of petroleum coke to methane.
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Hippo, Edwin J.; Reiling, Vincent G.; Robinson, Earl T.; Raman, Pattabhi K.; Smith, Jeffery; Mims, Charles; Nahas, Nicholas Charles, Char methanation catalyst and its use in gasification processes.
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Hippo, Edwin J.; Raman, Pattabhi K., Co-feed of biomass as source of makeup catalysts for catalytic coal gasification.
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Robinson, Earl T.; Raman, Pattabhi K.; Wu, Wenyuan, Conversion of liquid heavy hydrocarbon feedstocks to gaseous products.
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Rappas, Alkis S.; Spitz, Robert A., Hydromethanation of a carbonaceous feedstock with nickel recovery.
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Preston, William E., Integrated enhanced oil recovery process.
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Raman, Pattabhi K., Integrated enhanced oil recovery process.
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Wallace, Paul, Integrated enhanced oil recovery process.
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Powell, Charles Allen; Raman, Pattabhi K.; Robinson, Earl T.; Sirdeshpande, Avinash, Integrated hydromethanation fuel cell power generation.
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Jahnke,Fred C.; Parab,Sanjay C., Methanation assembly using multiple reactors.
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Bergins, Christian; Buddenberg, Torsten; Kakaras, Emmanouil, Methanation method and power plant comprising CO2 methanation of power plant flue gas.
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Wallace, Paul Steven; Frydman, Arnaldo, Method and apparatus to facilitate substitute natural gas production.
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Clomburg, Jr., Lloyd Anthony; Nilekar, Anand, Process for producing a methane-rich gas.
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Wix, Christian, Process for the production of substitute natural gas.
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[미국특허] Split stream methanation process 원문보기

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