Refrigeration – Processes – Circulating external gas
Patent
1986-02-13
1987-09-29
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
55 26, 55 68, 62 20, F25J 300
Patent
active
046966889
ABSTRACT:
A continuous process for selective countercurrent extraction of C.sub.2 + hydrocarbons from a gas stream with a lean oil as solvent is rejuvenated by substitution of a preferential physical solvent for the lean oil solvent to produce a residue gas stream meeting specifications for methane content and a hydrocarbon product having a composition which can be adjusted to a selected minimum degree for ethane that is as low as 2% ethane and produce at the maximum propane content that is available from the equipment, whereby profitability of the extraction operation can be maximized at all times. The preferential physical solvent has a minimum relative volatility of methane over ethane of at least 6.0 and a solubility of at least 1.0 standard cubic foot of gaseous hydrocarbons per gallon of the solvent (thereby defining its hydrocarbon loading capacity) or, alternatively, a preferential factor of at least 6.0. Preferred solvents include polyalkylene ethers of dialkylene glycol and alkyl-substituted monocyclic C.sub.8 -C.sub.10 aromatic hydrocarbons, preferably including mesitylene, reformates, crackates, and mixed xylenes.
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Advanced Extraction Technologies, Inc.
Capossela Ronald C.
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