Production of hydrogen from underground coal gasification

Details Production of hydrogen from underground coal gasification Production of hydrogen from underground coal gasification

Filed on

2006-09-11

Date issued

2008-10-07

Examiner

Gay, Jennifer H. (Department: 3676)

Patent Class

Wells

SubClass

Processes

SubSubClass

Separating material entering well

Other Related Categories

C166S228000, C166S369000

Type

Reexamination Certificate

Status

active

Patent number

07431084

Description

ABSTRACT:
A system of obtaining hydrogen from a coal seam by providing a production well that extends into the coal seam; positioning a conduit in the production well leaving an annulus between the conduit and the coal gasification production well, the conduit having a wall; closing the annulus at the lower end to seal it from the coal gasification cavity and the syngas; providing at least a portion of the wall with a bifunctional membrane that serves the dual purpose of providing a catalyzing reaction and selectively allowing hydrogen to pass through the wall and into the annulus; and producing the hydrogen through the annulus.

REFERENCES:
patent: 4356866 (1982-11-01), Savins
patent: 4386657 (1983-06-01), Kiss et al.
patent: 5332036 (1994-07-01), Shirley et al.
patent: 5860476 (1999-01-01), Kjos
patent: 6725921 (2004-04-01), de Rouffignac et al.
patent: 2003/0024699 (2003-02-01), Vinegar et al.

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