Process for separating coal synthesized methane from unreacted intermediate and contaminant gases

Patent · Fri Jan 01 00:00:00 EST 1982

OSTI ID:864247

Barker, Ray E ^[1]; Scott, Charles D ^[2]; Ryon, Allen D ^[2]

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1. Knoxville, TN
2. Oak Ridge, TN

Gas produced from coal and containing CH.sub.4, CO, CO.sub.2, H.sub.2 and H.sub.2 S is contacted with CO.sub.2 scrub liquid to form (1) a liquid CO.sub.2 stream containing as solutes CH.sub.4, H.sub.2 S and minor portions of the CO and H.sub.2, and (2) a gas stream containing CO.sub.2 and major portions of the CO and H.sub.2, the CO and H.sub.2 in this stream being recycled to the means which produces gas from coal, and CO.sub.2 in the stream being recycled to the scrub liquid. The solute-bearing liquid CO.sub.2 stream is fractionated into (1) a liquid CO.sub.2 stream containing CH.sub.4 and H.sub.2 S, and (2) a H.sub.2 /CO gas stream which is recycled into contact with the scrub liquid. The last-mentioned liquid CO.sub.2 stream is fractionated into (1) a CH.sub.4 /CO.sub.2 gas stream the CO.sub.2 of which is recycled to the scrub liquid, and (2) a liquid CO.sub.2 stream containing H.sub.2 S, and CO.sub.2 of this stream is also recycled to the scrub liquid.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4336044
• OSTI ID: 864247
• Country of Publication: United States
• Language: English

Related Subjects

process
separating
coal
synthesized
methane
unreacted
intermediate
contaminant
gases
gas
produced
containing
contacted
scrub
liquid
form
stream
solutes
minor
portions
major
recycled
means
produces
solute-bearing
fractionated
contact
last-mentioned
gas stream
stream containing
major portion
gas produced
minor portion
/62/48/95/