NATURAL GAS LIQUEFACTION PRETREATMENT PROCESS

A METHOD FOR PRETREATING A NATURAL GAS STREAM USING A SINGLE SCRUB COLUMN TO REMOVE FREEZABLE C5+ COMPONENTS AND PROVIDE AN LNG PRODUCT WHICH CAN BE CONVENIENTLY HANDLED AND SHIPPED IS DISCLOSED. THE METHOD COMPRISES FEEDING A NATURAL GAS STREAM TO A FEED POINT ON A SCRUB COLUMN OPERATED SUBSTANTIAL...

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Hauptverfasser: CHARLES ARTHUR DURR, WILLIAM CHARLES PETTERSON, DAVID ALAN COYLE
Format: Patent
Sprache:eng
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Zusammenfassung:A METHOD FOR PRETREATING A NATURAL GAS STREAM USING A SINGLE SCRUB COLUMN TO REMOVE FREEZABLE C5+ COMPONENTS AND PROVIDE AN LNG PRODUCT WHICH CAN BE CONVENIENTLY HANDLED AND SHIPPED IS DISCLOSED. THE METHOD COMPRISES FEEDING A NATURAL GAS STREAM TO A FEED POINT ON A SCRUB COLUMN OPERATED SUBSTANTIALLY AS AN ABSORPTION COLUMN WHEREIN THE HEAVY COMPONENTS ARE ABSORBED FROM THE FEED GAS USING A LIQUID REFLUX ESSENTIALLY FREE OF SUCH C5+ COMPONENTS. THE FEED CAN BE VAPOR INTRODUCED AT A LOW POINT ON THE COLUMN, OR CAN BE OPTIONALLY SPLIT, COOLED AND/OR EXPANDED AND INTRODUCED AT ONE OR MORE FEED POINTS ON THE COLUMN. THE REFLUX STREAM CAN BE OVERHEAD VAPOR CONDENSATE HAVING A TEMPERATURE OF ABOUT -40?C, OR METHANE-RICH LNG OR A COMBINATION OF LNG AND VAPOR CONDENSATE.(FIG. 1)