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19 13. The process of claim 12, wherein the absorber is operated at pressures of 500 to 650 psia. 14. The process of claim 1, wherein the effluent gas from Step E includes substantially only methane-and lightercomponentsattemperaturesof— 10°F.to25°F. 5 above the temperature of the lean polar compound introduced to the absorber. 15.The processofclaim1,whereinthefourthstream is reduced in pressure to 300 to 500 psia before being introduced into the fourth separator, 16. The process of claim 1, wherein the fourth separa tor operates at a pressure of 300 to 500 psia. 17. The process of claim 16, wherein the sixth stream isindirectlyheatexchangedwithaportionofthefourth 15 stream to reduce the temperature of the sixth stream to — 10°to20°F. 18. The process of claim 1, wherein the second and ?fthstreamarecombinedandcompressedtoapressure of 600 to 650 psia and refrigerated to a temperature of 20 - 10° to 20° F. 19. The process of claim 1, wherein the third separa tor operates at a pressure of 300 to 500 psia. 20. The process of claim 1, wherein the third stream iscondensedandpriortobeingcondensedismixedwith 25 aportionofthepolarcompound. 21. The process of claim 1, wherein the bottom efflu entoftheabsorberisindirectlyheatexchangedwiththe sixth stream to recover heat energy from the sixth stream. 22.The processofclaim1,whereinthefourthsepara tor operates at a pressure of 300 to 400 psi. 23. The process of claim 1, wherein the feed stream to the fourth separator is at a temperature of 120° F., or 35 45 les, 24.The processofclaim1,whereinthesixthstreamis the supply of substantially al of the lean polar com~ pound. 25. The process of claim 1, wherein the lean polar compoundischilledtoatemperatureof— 10°to20°F. before entering the absorber. 26. The process of claim 1, wherein there is further included hydrogen sulfide in the feed stream and the hydrogen sul?de is dissolved in the fourth stream. 27.A processforremovingcarbondioxidefroma feed stream of natural gas, having at least methane, ethane, carbon dioxide and heavier hydrocarbons, com prising: A. separating the feed stream into a Stream 1 substan tiallyalofthe propane and heavier hydrocarbons components and into a Stream 2 substantially all the methane and lighter gases, both Streams 1 and 2havingothercomponentsincludingethane; B. separating the components of Stream components 55 other than propane and heavier components form ing Stream 3; 65 4,861,360 20 C. separating Stream 2 to remove some carbon diox ide; D. Absorbing the other components from Stream 2 after Step C and all of Stream 3 in a lean polar compound, the components, other than methane and lighter gases forming Stream 4; E. Separating the ethane and carbon dioxide from the rest of Stream 4. 28. Apparatus for the removal of carbon dioxide from a feed stream of natural gas, having at least methane, ethane, carbon dioxide and heavier hydrocarbons, com prising: ?rst means for separating the feed stream into a Stream 1 having substantially al of the propane and heavier hydrocarbons and a Stream 2 having substantiallyalthemethaneandlightergases,both ofsaidStreams1and2havingwithothercompo nents including ethane: second means for separating Stream 2 to remove some of the carbon dioxide; third means for separating components of Stream 1, the components other than propane and heavier components forming a Stream 3; fourth means including a polar compound for absorb ing said other components from said Stream 2 and Stream 3, said other components forming a Stream 4; ?fth means for separating said components of said Stream 4 from the rest of said Stream 4. 29. A process for removing carbon dioxide from a - feed stream of natural gas, having at least methane, ethane and heavier hydrocarbon, comprising: A. ?rst, separating the feed stream in a first separator to form a ?rst stream, having substantially all of the propane and heavier hydrocarbons and carbon dioxide and ethane. and a second stream, having methane, carbon dioxide and ethane; B. mixing the second stream with a polar compound to form a third stream; C. separating the vapor and liquid of the third stream in an absorber; D. absorbing carbon dioxide and ethane from the separatedvaporofStepC inaleanportionofthe polar compound in the absorber, the absorbed car bon dioxide and ethane forming a fourth stream; E.separatingtheethanefromthepolarcompound and carbon dioxide in a third separator; F. separating the ?rst stream in a fourth separator to separate the propane and heavier hydrocarbons from the carbon dioxide and ethane, which carbon dioxide and ethane forms a ?fth stream; and G. separating the polar compound/carbon dioxide effluent of the second separator after separation in thethirdseparatorinafourthseparatortoseparate the carbon dioxide from the polar compound, the polar compound forming a sixth stream. * t ll 1‘ *PDF Image | CARBON DIOXIDE ABSORPTION METHANOL PROCESS
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