Hydromethanation of a carbonaceous feedstock

a carbonaceous feedstock and hydromethanization technology, applied in the direction of gaseous fuels, fuels, chemistry apparatus and processes, etc., can solve the problems of reducing the efficiency of catalyst recovery

Inactive Publication Date: 2012-03-15
SURE CHAMPION INVESTMENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0032]These and other embodiments, features and advantages of the present invention will be more readily understood by those of ordinary skill in the art from a reading of the following detailed description.

Problems solved by technology

Depending on operating conditions, return of certain fines material directly to the fluidized bed in the hydromethanation reactor may, however, have an adverse effect on the particle size distribution within the bed, and thus the optimal fluidization of the bed and operation of the reactor.
Because the fines particles contain catalyst and are hot, they are highly “active” making recycle back into the feedstock or for catalyst recovery potentially complicated.

Method used

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  • Hydromethanation of a carbonaceous feedstock
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Examples

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examples of specific embodiments

[0246]A specific embodiment of the process is one in which the process is a continuous process, in which steps (a), (b), (c) and (d), are operated in a continuous manner.

[0247]Another specific embodiment is on in which the superheated steam stream and oxygen-rich stream are mixed at or prior to introduction into the lower portion of the fluidized bed.

[0248]Another specific embodiment is one in which oxygen-rich gas stream (14) is supplied continuously to hydromethanation reactor (200), and the amount of oxygen provided is varied as a process control, for example, to control of the desired operating temperature of the hydromethanation reaction. As oxygen is supplied to the hydromethanation reactor, the resulting oxidation / combustion reaction (for example with carbon in the by-product char and fines) generates heat energy (as well as typically some amounts of carbon monoxide and hydrogen). The amount of oxygen supplied to the hydromethanation reactor can be increased or decreased to i...

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Abstract

The present invention relates to processes for hydromethanating a carbonaceous feedstock to a fines-depleted methane-enriched synthesis gas, with recycle of recovered particulate fines back into a specified portion of a hydromethanation reactor.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application Ser. No. 61 / 381,525 (filed 10 Sep. 2010), the disclosure of which is incorporated by reference herein for all purposes as if fully set forth.FIELD OF THE INVENTION[0002]The present invention relates to processes for hydromethanating a carbonaceous feedstock to a fines-depleted methane-enriched synthesis gas, with recycle of recovered particulate fines back into a specified portion of a hydromethanation reactor.BACKGROUND OF THE INVENTION[0003]In view of numerous factors such as higher energy prices and environmental concerns, the production of value-added products (such as pipeline-quality substitute natural gas, hydrogen, methanol, higher hydrocarbons, ammonia and electrical power) from lower-fuel-value carbonaceous feedstocks (such as petroleum coke, resids, asphaltenes, coal and biomass) is receiving renewed attention.[0004]Such lower-fuel-value carb...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L3/08
CPCC01B3/586C01B2203/0283C01B2203/0405C01B2203/043C01B2203/0445C01B2203/047C10J2300/1807C01B2203/0485C01B2203/0495C10L3/08C10L3/101C10J3/48C10J2300/0906C01B2203/0475
Inventor RAMAN, PATTABHI K.ROBINSON, EARL T.SIRDESHPANDE, AVINASH
Owner SURE CHAMPION INVESTMENT LTD
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