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UnitedStatesPatent [191 Apffel [1 PatentNumber: 4,861,360 [54] [75] [73] [21] [22] [63] [51] [52] [58] [56] CARBONDIOXIDEABSORPTION METHANOL PROCESS Inventor: FredApffel,Houston,Tex. Assignee: Flexivol,Inc.,Houston,Tex. App].No.: 58,485 unit. The feed gas is fed to the ?rst distillation system where the methane-and-lighter components are sepa ratedfromthepropane-and-heavierhydrocarbons.The top gas product from the ?rst distillation unit is mixed with a portion of the absorbing medium methanol and refrigerated. This mixture is fed to the bottom of the absorber. The gas containing methane, ethane and car bondioxideflowsuptheabsorbercountercurrenttothe downcoming liquid methanol. The ethane and carbon dioxide are dissolved by the methanol and exit the bot tom oftheabsorberasaliquid.The methane-and-lighter components are not dissolved by the methanol and leave the absorber as a gas. The bottoms from the ?rst distillation system are fed to a second distillation col umn where the ethane and carbon dioxide are distilled as a top gas product. This gas mixture and the warmed bottoms from the absorber are fed to a third distillation unit. A small amount of methanol is mixed with the overhead vapor from thisdistillationunit.The metha nol, a polar substance, causes the relativity of carbon dioxide to ethane to both invert. The ethane becomes the lighter component and is distilled from the top of the unit as a gas. The carbon dioxide and methanol bottoms product are fed to a fourth distillation unit where the carbon dioxide isdistilled from the methanol. Filed: Jun.5,1987 RelatedUS. ApplicationData Continuation-impartofSer.No.832,747,Feb.24,1984, Pat. No. 4,675,035. Int.Cl.4..F25J3/00 U.S.Cl...62/17;55/68; 62/20; 62/28 FieldofSearch..62/17,20,28;55/68 ReferencesCited U.S. PATENT DOCUMENTS 4,185,978 l/l980 McGalliardetal...62/28 Primary Examiner-Ronald C. Capossela Attorney, Agent, orFirm-David M. Ostfeld [57] ABSTRACT A processisdisclosedfortheseparationofhydrocarbon feed gas mixtures containing carbon dioxide. The pro cess utilizes four distillation units and one absorption 29 Claims, 4 Drawing Sheets /27 A29 ' [451 DateofPatent: Aug.29,1989 WARM Eff/FIE. MAT/704N471. —PDF Image | CARBON DIOXIDE ABSORPTION METHANOL PROCESS
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