Hydrocarbon gas processing
First Claim
1. A process for the separation of a gas stream containing methane, C2 components, C3 components, and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile fraction containing a major portion of said C3 components and heavier hydrocarbon components wherein(1) said gas stream is cooled in a first heat exchange means;
- (2) said cooled gas stream is expanded to a lower pressure whereby the cooled gas stream is further cooled;
(3) said expanded cooled gas stream is supplied as a bottom feed to an absorbing means housed in a single equipment item processing assembly;
(4) a first distillation liquid stream is collected from a lower region of said absorbing means and supplied as a top feed to a mass transfer means housed in said processing assembly;
(5) a first distillation vapor stream is collected from an upper region of said mass transfer means and cooled sufficiently to condense at least a part of said first distillation vapor stream in a second heat exchange means;
(6) said at least partially condensed first distillation vapor stream is supplied to a separating means and is separated therein, thereby forming a condensed stream and a residual vapor stream containing any uncondensed vapor remaining after said first distillation vapor stream is cooled;
(7) at least a portion of said condensed stream is supplied as a top feed to said absorbing means;
(8) a second distillation vapor stream is collected from an upper region of said absorbing means and heated in said second heat exchange means, thereby to supply at least a portion of the cooling of step (5);
(9) said heated second distillation vapor stream is combined with any said residual vapor stream to form a combined vapor stream;
(10) said combined vapor stream is heated in said first heat exchange means, thereby to supply at least a portion of the cooling of step (1), and thereafter discharging said heated combined vapor stream as said volatile residue gas fraction;
(11) a second distillation liquid stream is collected from a lower region of said mass transfer means and heated in a heat and mass transfer means housed in said processing assembly, thereby to simultaneously strip the more volatile components from said second distillation liquid stream, and thereafter discharging said heated and stripped second distillation liquid stream from said processing assembly as said relatively less volatile fraction; and
(12) the quantities and temperatures of said feed streams to said absorbing means are effective to maintain the temperature of said upper region of said absorbing means at a temperature whereby the major portions of the components in said relatively less volatile fraction are recovered.
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Accused Products
Abstract
A process and an apparatus are disclosed for a compact processing assembly to recover propane, propylene, and heavier hydrocarbon components from a hydrocarbon gas stream. The gas stream is cooled, expanded to lower pressure, and fed to an absorbing means. A first distillation liquid stream from the absorbing means is fed to a mass transfer means. A first distillation vapor stream from the mass transfer means is cooled to partially condense it, forming a residual vapor stream and a condensed stream. The condensed stream is supplied as the top feed to the absorbing means. A second distillation vapor stream from the absorbing means is heated by cooling the first distillation vapor stream, combined with the residual vapor stream, and heated by cooling the gas stream. A second distillation liquid stream from the mass transfer means is heated in a heat and mass transfer means to strip out its volatile components.
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Citations
45 Claims
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1. A process for the separation of a gas stream containing methane, C2 components, C3 components, and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile fraction containing a major portion of said C3 components and heavier hydrocarbon components wherein
(1) said gas stream is cooled in a first heat exchange means; -
(2) said cooled gas stream is expanded to a lower pressure whereby the cooled gas stream is further cooled; (3) said expanded cooled gas stream is supplied as a bottom feed to an absorbing means housed in a single equipment item processing assembly; (4) a first distillation liquid stream is collected from a lower region of said absorbing means and supplied as a top feed to a mass transfer means housed in said processing assembly; (5) a first distillation vapor stream is collected from an upper region of said mass transfer means and cooled sufficiently to condense at least a part of said first distillation vapor stream in a second heat exchange means; (6) said at least partially condensed first distillation vapor stream is supplied to a separating means and is separated therein, thereby forming a condensed stream and a residual vapor stream containing any uncondensed vapor remaining after said first distillation vapor stream is cooled; (7) at least a portion of said condensed stream is supplied as a top feed to said absorbing means; (8) a second distillation vapor stream is collected from an upper region of said absorbing means and heated in said second heat exchange means, thereby to supply at least a portion of the cooling of step (5); (9) said heated second distillation vapor stream is combined with any said residual vapor stream to form a combined vapor stream; (10) said combined vapor stream is heated in said first heat exchange means, thereby to supply at least a portion of the cooling of step (1), and thereafter discharging said heated combined vapor stream as said volatile residue gas fraction; (11) a second distillation liquid stream is collected from a lower region of said mass transfer means and heated in a heat and mass transfer means housed in said processing assembly, thereby to simultaneously strip the more volatile components from said second distillation liquid stream, and thereafter discharging said heated and stripped second distillation liquid stream from said processing assembly as said relatively less volatile fraction; and (12) the quantities and temperatures of said feed streams to said absorbing means are effective to maintain the temperature of said upper region of said absorbing means at a temperature whereby the major portions of the components in said relatively less volatile fraction are recovered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An apparatus for the separation of a gas stream containing methane, C2 components, C3 components, and heavier hydrocarbon components into a volatile residue gas fraction and a relatively less volatile fraction containing a major portion of said C3 components and heavier hydrocarbon components comprising
(1) first heat exchange means to cool said gas stream; -
(2) expansion means connected to said first heat exchange means to receive said cooled gas stream and expand said cooled gas stream to lower pressure; (3) absorbing means housed in a single equipment item processing assembly and connected to said expansion means to receive said expanded cooled gas stream as a bottom feed thereto; (4) first liquid collecting means housed in said processing assembly and connected to said absorbing means to receive a first distillation liquid stream from a lower region of said absorbing means; (5) mass transfer means housed in said processing assembly and connected to said first liquid collecting means to receive said first distillation liquid stream as a top feed thereto; (6) first vapor collecting means housed in said processing assembly and connected to said mass transfer means to receive a first distillation vapor stream from an upper region of said mass transfer means; (7) second heat exchange means connected to said first vapor collecting means to receive said first distillation vapor stream and cool said first distillation vapor stream sufficiently to condense at least a part of said first distillation vapor stream; (8) separating means connected to said second heat exchange means to receive said at least partially condensed first distillation vapor stream and separate said at least partially condensed first distillation vapor stream into a condensed stream and a residual vapor stream containing any uncondensed vapor remaining after said first distillation vapor stream is cooled; (9) said absorbing means being further connected to said separating means to receive at least a portion of said condensed stream as a top feed thereto; (10) second vapor collecting means housed in said processing assembly and connected to said absorbing means to receive a second distillation vapor stream from an upper region of said absorbing means; (11) said second heat exchange means being further connected to said second vapor collecting means to receive said second distillation vapor stream and heat said second distillation vapor stream, thereby to supply at least a portion of the cooling of step (7); (12) combining means connected to said second heat exchange means and said separating means to receive said heated second distillation vapor stream and any said residual vapor stream and form a combined vapor stream; (13) said first heat exchange means being further connected to said combining means to receive said combined vapor stream and heat said combined vapor stream, thereby to supply at least a portion of the cooling of step (1), and thereafter discharging said heated combined vapor stream as said volatile residue gas fraction; (14) second liquid collecting means housed in said processing assembly and connected to said mass transfer means to receive a second distillation liquid stream from a lower region of said mass transfer means; (15) heat and mass transfer means housed in said processing assembly and connected to said second liquid collecting means to receive said second distillation liquid stream and heat said second distillation liquid stream, thereby to simultaneously strip the more volatile components from said second distillation liquid stream, and thereafter discharging said heated and stripped second distillation liquid stream from said processing assembly as said relatively less volatile fraction; and (16) control means adapted to regulate the quantities and temperatures of said feed streams to said absorbing means to maintain the temperature of said upper region of said absorbing means at a temperature whereby the major portions of the components in said relatively less volatile fraction are recovered. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification