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US 6,257,018 B1Granted
PFC recovery using condensation
AssigneePraxair Technology, Inc.
InventorsRichard Martin Kelly, Dante Patrick Bonaquist
Life of this patent
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Abstract
This invention is directed to a method, and a system therefor, for recovering PFC using condensation by passing a PFC-containing feed stream into a condenser, preferably reflux condenser, to effect liquefaction into a PFC-containing condensate and a carrier gas stream, and passing the PFC-containing product into a mass transfer unit to fractionate the PFC-containing condensate into a high volatility PFC stream and a PFC product.
Claims6
A system for recovering PFCs using condensation comprising
- a) a condenser to provide indirect heat transfer from a PFC-containing gaseous stream to effect liquefaction into a PFC-containing condensate and a carrier gas stream;
- b) a mass transfer unit to fractionate said PFC-containing condensate into a high volatility PFC stream and a PFC product;
- and
- c) a heat exchange unit for cooling said PFC-containing feed stream Prior to passing said feed stream into said condenser;
- wherein said high volatility PFC stream is recycled to combine with said PFC-containing feed stream.
2 more elements
A method for recovering PFCs using condensation comprising
- a) passing a PFC-containing feed stream into a condenser to effect liquefaction into a PFC-containing condensate and a carrier gas stream;
- b) passing said PFC-containing condensate into a mass transfer unit to fractionate said PFC-containing condensate into a high volatility PFC stream and a PFC product;
- and
- c) cooling said PFC-containing feed stream into a heat exchange unit prior to passing said feed stream into said condenser so as to recycle said high volatility PFC stream to combine with said PFC-containing feed stream.
1 more element
Dependencies are inferred from the claim text.