Refrigeration – Processes – Circulating external gas
Patent
1983-06-24
1985-04-16
Sever, Frank
Refrigeration
Processes
Circulating external gas
55 73, 55 76, F25J 302
Patent
active
045113815
ABSTRACT:
A continuous process for selective countercurrent extraction of C.sub.2 + hydrocarbons from a natural gas stream with a physical solvent while at pipeline pressures to produce a residue natural gas stream meeting pipeline specifications and a liquid hydrocarbon product having a composition which can be readily adjusted to any selected degree in accordance with market conditions so that profitability of the extraction operation can be maximized at all times. The rich solvent is let down in pressure through successive flashing stages to produce a liquid product, and the stripped solvent is recirculated to the extraction step. The versatility of the process is achieved by using the following steps, in order of importance: (1) selectively varying the flow rate of the solvent with respect to the flow rate of the natural gas stream; (2) selectively varying the flashing pressure for one or more successive flashing stages; (3) recycling the flashed C.sub.1 + undesirable gases to the extraction step; and (4) rejecting selected components of the liquid product in a stripping column for the liquid hydrocarbon product by: (a) selectively varying the pressure in the column, and (b) selectively varying the temperature at the bottom of the column. The rejected components are also recycled to the extraction step and are C.sub.1, C.sub.1 +C.sub.2, C.sub.1 +C.sub.2 +C.sub.3, or C.sub.1 +C.sub.2 +C.sub.3 +C.sub.4. If water is present in significant quantities, the solvent is regenerated before recycling it to the extraction step.
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Sweny, John W., "High CO.sub.2 -High H.sub.2 S Removal with Selexol Solvent," Mar. 17-19, 1980, 59th Annual GPA Convention, Houston, Texas.
El Paso Hydrocarbons Company
Sever Frank
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