US20150315105A2 - Hydrocarbon Processing - Google Patents
Hydrocarbon Processing Download PDFInfo
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- US20150315105A2 US20150315105A2 US14/462,069 US201414462069A US2015315105A2 US 20150315105 A2 US20150315105 A2 US 20150315105A2 US 201414462069 A US201414462069 A US 201414462069A US 2015315105 A2 US2015315105 A2 US 2015315105A2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/16—Fractionating columns in which vapour bubbles through liquid
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/04—Purification; Separation; Use of additives by distillation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
- B01D3/322—Reboiler specifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
- B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
- B01D5/0063—Reflux condensation
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G7/00—Distillation of hydrocarbon oils
- C10G7/08—Azeotropic or extractive distillation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/12—Liquefied petroleum gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/06—Heat exchange, direct or indirect
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/541—Absorption of impurities during preparation or upgrading of a fuel
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/543—Distillation, fractionation or rectification for separating fractions, components or impurities during preparation or upgrading of a fuel
Definitions
- This invention relates to a process and apparatus for the separation of a hydrocarbon stream.
- the applicants claim the benefits under Title 35, United States Code, Section 119(e) of prior U.S. Provisional Application No. 61/876,409 which was filed on Sep. 11, 2013, No. 61/878,977 which was filed on Sep. 17, 2013, and No. 61/879,237 which was filed on Sep. 18, 2013.
- Assignees S.M.E. Products LP and Ortloff Engineers, Ltd. were parties to a joint research agreement that was in effect before the invention of this application was made.
- Ethylene, ethane, propylene, propane, and/or heavier hydrocarbons can be recovered from a variety of gases, such as natural gas, refinery gas, and synthetic gas streams obtained from other hydrocarbon materials such as coal, crude oil, naphtha, oil shale, tar sands, and lignite.
- Natural gas usually has a major proportion of methane and ethane, i.e., methane and ethane together comprise at least 50 mole percent of the gas.
- the gas also contains relatively lesser amounts of heavier hydrocarbons such as propane, butanes, pentanes, and the like, as well as hydrogen, nitrogen, carbon dioxide, and/or other gases.
- the recovered ethylene, ethane, propylene, propane, and/or heavier hydrocarbons are generally recovered as a mixed product by a gas processing plant, whereupon the mixed hydrocarbon product is then sent elsewhere for further processing and/or use as feedstock for chemical conversion and/or fuel production processes.
- the present invention is generally concerned with the separation of such mixed hydrocarbon streams into a fraction containing the more volatile hydrocarbon components and a fraction containing the less volatile hydrocarbon components.
- separation is often advantageous because one or both of the products is more valuable when separated from the other product.
- separating (deethanizing) the ethane from the natural gas liquids (NGL) produced in a gas processing plant would allow the ethane to be used as a premium feedstock for an ethylene cracking process, making it more valuable than it is as a part of the NGL stream.
- This separate ethane product could also be more valuable based on its gaseous fuel value than it is as part of the NGL stream when there is an over-supply of ethane in the market.
- the present invention is a novel means of fractionating hydrocarbon streams that combines what heretofore have been individual equipment items into a common housing, thereby reducing both the plot space requirements and the capital cost of the addition.
- the more compact arrangement also significantly reduces the power consumption required to achieve a given recovery level, thereby increasing the process efficiency and reducing the operating cost of the facility.
- the more compact arrangement also eliminates much of the piping used to interconnect the individual equipment items in traditional plant designs, further reducing capital cost and also eliminating the associated flanged piping connections.
- piping flanges are a potential leak source for hydrocarbons (which are volatile organic compounds, VOCs, that contribute to greenhouse gases and may also be precursors to atmospheric ozone formation), eliminating these flanges reduces the potential for atmospheric emissions that may damage the environment.
- FIG. 1 is a flow diagram of a prior art hydrocarbon fractionation plant similar to that shown in FIG. 2 of “New NGL-Recovery Process Provides Viable Alternative”, Huebel, Robert R. and Malsam, Michael G., Oil & Gas Journal, Jan. 9, 2012;
- FIG. 2 is a flow diagram of a hydrocarbon fractionation plant in accordance with the present invention.
- FIGS. 3 through 9 are flow diagrams illustrating alternative means of application of the present invention to a hydrocarbon stream.
- FIG. 1 is a process flow diagram showing the design of a processing plant to remove C 2 components and lighter components from an NGL stream using a prior art process.
- the mixed hydrocarbon liquids enter the plant at 73° F. [23° C.] and 400 psia [2,758 kPa(a)] as stream 31 which is directed to a mid-column feed point on fractionation tower (deethanizer) 11 .
- the deethanizer in tower 11 is a conventional distillation column containing a plurality of vertically spaced trays, one or more packed beds, or some combination of trays and packing.
- the fractionation tower may consist of two sections, an upper rectifying section 11 a and a lower stripping section 11 b .
- the upper rectifying section 11 a contains trays and/or packing and provides the necessary contact between the vapor rising from the lower distillation or deethanizing section 11 b and a liquid stream (reflux) to remove the C 3 components and heavier components from the vapor.
- the lower stripping (deethanizing) section 1 b also contains trays and/or packing and provides the necessary contact between the liquids falling downward and the vapors rising upward.
- Stripping section 11 b also includes at least one reboiler (such as the reboiler 15 ) which heats and vaporizes a portion of the liquids flowing down the column to provide the stripping vapors which flow up the column to strip the liquid product, stream 35 , of C 2 components and lighter components.
- Liquid product stream 35 exits the bottom of the tower at 209° F. [98° C.], based on a typical specification of an ethane to propane ratio of 0.020:1 on a molar basis in the bottom product, and contains essentially only the less volatile components that were in NGL feed stream 31 , which in this case are the propane and heavier components.
- the column overhead vapor (stream 32 ) is withdrawn from the top of deethanizer 11 at 41° F. [5° C.] and partially condensed (stream 32 a ) as it is cooled to 39° F. [4° C.] in heat exchanger 12 using a refrigerant.
- the operating pressure (391 psia [2,694 kPa(a)]) in reflux separator 13 is maintained slightly below the operating pressure (396 psia [2,728 kPa(a)]) of deethanizer 11 .
- FIG. 2 illustrates a flow diagram of a process in accordance with the present invention.
- the NGL stream composition and conditions considered in the process presented in FIG. 2 are the same as those in FIG. 1 . Accordingly, the FIG. 2 process can be compared with that of the FIG. 1 process to illustrate the advantages of the present invention.
- mixed hydrocarbon liquids stream 31 at 73° F. [23° C.] and 400 psia [2,758 kPa(a)] is directed to processing assembly 111 , entering between an absorbing means inside rectifying section 111 b and a mass transfer means inside stripping section 111 c .
- the liquids leaving the lower region of the absorbing means combine with the liquid portion (if any) of feed stream 31 , and the combined liquids enter the upper region of the mass transfer means.
- the vapors leaving the upper region of the mass transfer means combine with the vapor portion (if any) of feed stream 31 , and the combined vapors enter the lower region of the absorbing means.
- a heat and mass transfer means is located below the mass transfer means inside vaporizing section 111 d of processing assembly 111 .
- the heat and mass transfer means may be comprised of a fin and tube type heat exchanger, a plate type heat exchanger, a brazed aluminum type heat exchanger, or other type of heat transfer device, including multi-pass and/or multi-service heat exchangers.
- the heat and mass transfer means is configured to provide heat exchange between a heating medium flowing through one pass of the heat and mass transfer means and a distillation liquid stream flowing downward from the lower region of the mass transfer means, so that the distillation liquid stream is heated.
- the heat and mass transfer means provides continuous contact between the stripping vapors and the distillation liquid stream so that it also functions to provide mass transfer between the vapor and liquid phases, stripping the liquid product stream 35 of ethane and lighter components.
- the stripping vapors produced in the heat and mass transfer means continue upward to the mass transfer means in stripping section 111 c to provide partial stripping of the lighter components in the liquids flowing downward from the upper part of processing assembly 111 .
- Another heat and mass transfer means is located above the absorbing means, inside condensing section 111 a of processing assembly 111 .
- This heat and mass transfer means may also be comprised of a fin and tube type heat exchanger, a plate type heat exchanger, a brazed aluminum type heat exchanger, or other type of heat transfer device, including multi-pass and/or multi-service heat exchangers.
- the heat and mass transfer means is configured to provide heat exchange between a refrigerant stream flowing through one pass of the heat and mass transfer means and the distillation vapor stream arising from the upper region of the absorbing means flowing upward through the other pass, so that the distillation vapor stream is cooled by the refrigerant.
- the heat and mass transfer means provides continuous contact between the condensed liquid and the distillation vapor stream so that it also functions to provide mass transfer between the vapor and liquid phases, thereby absorbing propane and heavier components from the distillation vapor stream to rectify it.
- the condensed liquid is collected from the bottom of the heat and mass transfer means and directed to the upper region of the absorbing means inside rectifying section 111 b to provide partial rectification of the heavier components in the vapors flowing upward from the lower part of processing assembly 111 .
- the absorbing means inside rectifying section 111 b and the mass transfer means inside stripping section 111 c each consist of a plurality of vertically spaced trays, one or more packed beds, or some combination of trays and packing.
- the trays and/or packing in rectifying section 111 b and stripping section 111 c provide the necessary contact between the vapors rising upward and liquid falling downward.
- the liquid portion (if any) of feed stream 31 commingles with liquids falling downward from rectifying section 111 b and the combined liquids continue downward into stripping section 111 c , which vaporizes and strips the ethane and lighter components from these liquids.
- the distillation liquid flowing downward from the heat and mass transfer means in vaporizing section 111 d inside processing assembly 111 has been stripped of ethane and lighter components.
- the resulting liquid product (stream 35 ) exits the lower region of vaporizing section 111 d at 208° F. [98° C.], based on a typical specification of a ethane to propane ratio of 0.020:1 on a molar basis in the bottom product, and leaves processing assembly 111 .
- This liquid product contains the less volatile components that were in NGL feed stream 31 , which in this case are the propane and heavier components.
- the distillation vapor stream 33 arising from condensing section 111 a leaves processing assembly 111 at 39° F.
- the improvement in recovery efficiency provided by the present invention over that of the prior art of the FIG. 1 process is primarily due to two factors.
- the C 3 components and heavier hydrocarbon components can be removed from the distillation vapor stream using less refrigeration than is possible using conventional mass transfer equipment and conventional heat transfer equipment like the prior art of the FIG. 1 process.
- the volatile components are stripped out of the liquid continuously, reducing the concentration of the volatile components in the stripping vapors more quickly and thereby improving the stripping efficiency for the present invention.
- the present invention also offers at least two additional advantages over the prior art.
- This reduces the plot space requirements and eliminates the interconnecting piping, reducing the capital cost of the processing plant.
- elimination of the interconnecting piping means that a processing plant using the present invention has far fewer flanged connections compared to the prior art, reducing the number of potential leak sources in the plant.
- Hydrocarbons are volatile organic compounds (VOCs), some of which are classified as greenhouse gases and some of which may be precursors to atmospheric ozone formation, which means the present invention reduces the potential for atmospheric releases that may damage the environment.
- VOCs volatile organic compounds
- Some circumstances may favor not providing a mass transfer means above vaporizing section 111 d , allowing the elimination of stripping section 111 c .
- the liquid portion of feed stream 31 and the liquids from either rectifying section 111 b ( FIG. 3 ) or condensing section 111 a ( FIG. 5 ) flow directly to vaporizing section 111 d .
- some circumstances may favor not providing an absorbing means below condensing section 111 a , allowing the elimination of rectifying section 111 b .
- the liquid condensed from the distillation vapor entering condensing section 111 a is directed to either stripping section 111 c ( FIG. 4 ) or vaporizing section 111 d ( FIG. 5 ).
- the heat and mass transfer means inside condensing section 111 a can be configured to totally condense either the distillation vapor stream arising from the absorbing means inside rectifying section 111 b ( FIGS. 6 and 7 ) or the vapor portion of feed stream 31 combined with the distillation vapor stream from either stripping section 111 c ( FIG. 8 ) or vaporizing section 111 d ( FIG. 9 ).
- a liquid collecting means can then be used to direct a portion of the condensed liquid (reflux stream 34 ) to the upper region of the absorbing means in rectifying section 111 b ( FIGS. 6 and 7 ), to stripping section 111 c ( FIG.
- the present invention can be used to effect the desired separation between any components of different volatilities in a liquid hydrocarbon stream as required by the particular circumstances by appropriate adjustment of the operating conditions.
- the present invention can be used to separate C 3 components and lighter components from a liquefied petroleum gas (LPG) stream, so that the C 4 components and heavier components remain in the less volatile liquid product.
- LPG liquefied petroleum gas
- the present invention can also be used to process a vapor hydrocarbon stream or a hydrocarbon stream containing a mixture of liquid and vapor.
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Abstract
Description
- This invention relates to a process and apparatus for the separation of a hydrocarbon stream. The applicants claim the benefits under
Title 35, United States Code, Section 119(e) of prior U.S. Provisional Application No. 61/876,409 which was filed on Sep. 11, 2013, No. 61/878,977 which was filed on Sep. 17, 2013, and No. 61/879,237 which was filed on Sep. 18, 2013. Assignees S.M.E. Products LP and Ortloff Engineers, Ltd. were parties to a joint research agreement that was in effect before the invention of this application was made. - Ethylene, ethane, propylene, propane, and/or heavier hydrocarbons can be recovered from a variety of gases, such as natural gas, refinery gas, and synthetic gas streams obtained from other hydrocarbon materials such as coal, crude oil, naphtha, oil shale, tar sands, and lignite. Natural gas usually has a major proportion of methane and ethane, i.e., methane and ethane together comprise at least 50 mole percent of the gas. The gas also contains relatively lesser amounts of heavier hydrocarbons such as propane, butanes, pentanes, and the like, as well as hydrogen, nitrogen, carbon dioxide, and/or other gases. The recovered ethylene, ethane, propylene, propane, and/or heavier hydrocarbons are generally recovered as a mixed product by a gas processing plant, whereupon the mixed hydrocarbon product is then sent elsewhere for further processing and/or use as feedstock for chemical conversion and/or fuel production processes.
- The present invention is generally concerned with the separation of such mixed hydrocarbon streams into a fraction containing the more volatile hydrocarbon components and a fraction containing the less volatile hydrocarbon components. Such separation is often advantageous because one or both of the products is more valuable when separated from the other product. For example, separating (deethanizing) the ethane from the natural gas liquids (NGL) produced in a gas processing plant would allow the ethane to be used as a premium feedstock for an ethylene cracking process, making it more valuable than it is as a part of the NGL stream. This separate ethane product could also be more valuable based on its gaseous fuel value than it is as part of the NGL stream when there is an over-supply of ethane in the market.
- The present invention is a novel means of fractionating hydrocarbon streams that combines what heretofore have been individual equipment items into a common housing, thereby reducing both the plot space requirements and the capital cost of the addition. Surprisingly, applicants have found that the more compact arrangement also significantly reduces the power consumption required to achieve a given recovery level, thereby increasing the process efficiency and reducing the operating cost of the facility. In addition, the more compact arrangement also eliminates much of the piping used to interconnect the individual equipment items in traditional plant designs, further reducing capital cost and also eliminating the associated flanged piping connections. Since piping flanges are a potential leak source for hydrocarbons (which are volatile organic compounds, VOCs, that contribute to greenhouse gases and may also be precursors to atmospheric ozone formation), eliminating these flanges reduces the potential for atmospheric emissions that may damage the environment.
- For a better understanding of the present invention, reference is made to the following examples and drawings. Referring to the drawings:
-
FIG. 1 is a flow diagram of a prior art hydrocarbon fractionation plant similar to that shown in FIG. 2 of “New NGL-Recovery Process Provides Viable Alternative”, Huebel, Robert R. and Malsam, Michael G., Oil & Gas Journal, Jan. 9, 2012; -
FIG. 2 is a flow diagram of a hydrocarbon fractionation plant in accordance with the present invention; and -
FIGS. 3 through 9 are flow diagrams illustrating alternative means of application of the present invention to a hydrocarbon stream. - In the following explanation of the above figures, tables are provided summarizing flow rates calculated for representative process conditions. In the tables, appearing herein, the values for flow rates (in moles per hour) have been rounded to the nearest whole number for convenience. The total stream rates shown in the tables include all non-hydrocarbon components and hence are generally larger than the sum of the stream flow rates for the hydrocarbon components. Temperatures indicated are approximate values rounded to the nearest degree. It should also be noted that the process design calculations performed for the purpose of comparing the processes depicted in the figures are based on the assumption of no heat leak from (or to) the surroundings to (or from) the process. The quality of commercially available insulating materials makes this a very reasonable assumption and one that is typically made by those skilled in the art.
- For convenience, process parameters are reported in both the traditional British units and in the units of the Système International d'Unités (SI). The molar flow rates given in the tables may be interpreted as either pound moles per hour or kilogram moles per hour. The energy consumptions reported as horsepower (HP) and/or thousand British Thermal Units per hour (MBTU/Hr) correspond to the stated molar flow rates in pound moles per hour. The energy consumptions reported as kilowatts (kW) correspond to the stated molar flow rates in kilogram moles per hour.
-
FIG. 1 is a process flow diagram showing the design of a processing plant to remove C2 components and lighter components from an NGL stream using a prior art process. In this simulation of the process, the mixed hydrocarbon liquids enter the plant at 73° F. [23° C.] and 400 psia [2,758 kPa(a)] asstream 31 which is directed to a mid-column feed point on fractionation tower (deethanizer) 11. - The deethanizer in tower 11 is a conventional distillation column containing a plurality of vertically spaced trays, one or more packed beds, or some combination of trays and packing. As is often the case, the fractionation tower may consist of two sections, an upper rectifying
section 11 a and alower stripping section 11 b. The upper rectifyingsection 11 a contains trays and/or packing and provides the necessary contact between the vapor rising from the lower distillation or deethanizingsection 11 b and a liquid stream (reflux) to remove the C3 components and heavier components from the vapor. The lower stripping (deethanizing) section 1 b also contains trays and/or packing and provides the necessary contact between the liquids falling downward and the vapors rising upward.Stripping section 11 b also includes at least one reboiler (such as the reboiler 15) which heats and vaporizes a portion of the liquids flowing down the column to provide the stripping vapors which flow up the column to strip the liquid product,stream 35, of C2 components and lighter components.Liquid product stream 35 exits the bottom of the tower at 209° F. [98° C.], based on a typical specification of an ethane to propane ratio of 0.020:1 on a molar basis in the bottom product, and contains essentially only the less volatile components that were inNGL feed stream 31, which in this case are the propane and heavier components. - The column overhead vapor (stream 32) is withdrawn from the top of deethanizer 11 at 41° F. [5° C.] and partially condensed (
stream 32 a) as it is cooled to 39° F. [4° C.] inheat exchanger 12 using a refrigerant. The operating pressure (391 psia [2,694 kPa(a)]) inreflux separator 13 is maintained slightly below the operating pressure (396 psia [2,728 kPa(a)]) of deethanizer 11. This provides the driving force which causesoverhead vapor stream 32 to flow throughreflux condenser 12 and thence into thereflux separator 13 wherein the condensed liquid (stream 34) is separated from the uncondensed vapor (stream 33). Theliquid stream 34 fromreflux separator 13 is pumped byreflux pump 14 to a pressure slightly above the operating pressure of deethanizer 11, andstream 34 a is then supplied as cold top column feed (reflux) to deethanizer 11. This cold liquid reflux absorbs and condenses the C3 components and heavier components in the vapors rising up in rectifyingsection 11 a of deethanizer 11. Vaporproduct stream 33 contains the more volatile components that were inNGL feed stream 31, which in this case are the ethane and lighter components (based on a typical specification of 0.75% propane in the ethane product on a molar basis). - A summary of stream flow rates and energy consumption for the process illustrated in
FIG. 1 is set forth in the following table: -
TABLE I (FIG. 1) Stream Flow Summary - Lb. Moles/Hr [kg moles/Hr] Stream Methane Ethane Propane Butanes Pentanes+ Total 31 15 1,482 681 329 192 2,727 32 20 3,444 19 0 0 3,530 34 5 1,975 15 0 0 2,015 33 15 1,469 4 0 0 1,515 35 0 13 677 329 192 1,212 Recoveries* Propane 99.35% Butanes+ 100.00% Power Refrigerant Compression 1,027 HP [1,688 kW] Utility Heat Deethanizer Reboiler 18,020 MBTU/Hr [11,641 kW] *(Based on un-rounded flow rates) -
FIG. 2 illustrates a flow diagram of a process in accordance with the present invention. The NGL stream composition and conditions considered in the process presented inFIG. 2 are the same as those inFIG. 1 . Accordingly, theFIG. 2 process can be compared with that of theFIG. 1 process to illustrate the advantages of the present invention. - In the process illustrated in
FIG. 2 , mixedhydrocarbon liquids stream 31, at 73° F. [23° C.] and 400 psia [2,758 kPa(a)] is directed toprocessing assembly 111, entering between an absorbing means inside rectifyingsection 111 b and a mass transfer means insidestripping section 111 c. The liquids leaving the lower region of the absorbing means combine with the liquid portion (if any) offeed stream 31, and the combined liquids enter the upper region of the mass transfer means. The vapors leaving the upper region of the mass transfer means combine with the vapor portion (if any) offeed stream 31, and the combined vapors enter the lower region of the absorbing means. - A heat and mass transfer means is located below the mass transfer means inside vaporizing
section 111 d ofprocessing assembly 111. The heat and mass transfer means may be comprised of a fin and tube type heat exchanger, a plate type heat exchanger, a brazed aluminum type heat exchanger, or other type of heat transfer device, including multi-pass and/or multi-service heat exchangers. The heat and mass transfer means is configured to provide heat exchange between a heating medium flowing through one pass of the heat and mass transfer means and a distillation liquid stream flowing downward from the lower region of the mass transfer means, so that the distillation liquid stream is heated. As the distillation liquid stream is heated, a portion of it is vaporized to form stripping vapors that rise upward to the mass transfer means as the remaining liquid continues flowing downward through the heat and mass transfer means. The heat and mass transfer means provides continuous contact between the stripping vapors and the distillation liquid stream so that it also functions to provide mass transfer between the vapor and liquid phases, stripping theliquid product stream 35 of ethane and lighter components. The stripping vapors produced in the heat and mass transfer means continue upward to the mass transfer means instripping section 111 c to provide partial stripping of the lighter components in the liquids flowing downward from the upper part ofprocessing assembly 111. - Another heat and mass transfer means is located above the absorbing means, inside condensing
section 111 a ofprocessing assembly 111. This heat and mass transfer means may also be comprised of a fin and tube type heat exchanger, a plate type heat exchanger, a brazed aluminum type heat exchanger, or other type of heat transfer device, including multi-pass and/or multi-service heat exchangers. The heat and mass transfer means is configured to provide heat exchange between a refrigerant stream flowing through one pass of the heat and mass transfer means and the distillation vapor stream arising from the upper region of the absorbing means flowing upward through the other pass, so that the distillation vapor stream is cooled by the refrigerant. As the distillation vapor stream is cooled, a portion of it is condensed and falls downward while the remaining distillation vapor stream continues flowing upward through the heat and mass transfer means. The heat and mass transfer means provides continuous contact between the condensed liquid and the distillation vapor stream so that it also functions to provide mass transfer between the vapor and liquid phases, thereby absorbing propane and heavier components from the distillation vapor stream to rectify it. The condensed liquid is collected from the bottom of the heat and mass transfer means and directed to the upper region of the absorbing means inside rectifyingsection 111 b to provide partial rectification of the heavier components in the vapors flowing upward from the lower part ofprocessing assembly 111. - The absorbing means inside rectifying
section 111 b and the mass transfer means inside strippingsection 111 c each consist of a plurality of vertically spaced trays, one or more packed beds, or some combination of trays and packing. The trays and/or packing in rectifyingsection 111 b and strippingsection 111 c provide the necessary contact between the vapors rising upward and liquid falling downward. The liquid portion (if any) offeed stream 31 commingles with liquids falling downward from rectifyingsection 111 b and the combined liquids continue downward into strippingsection 111 c, which vaporizes and strips the ethane and lighter components from these liquids. The vapors arising from strippingsection 111 c commingle with the vapor portion (if any) offeed stream 31 and the combined vapors rise upward through rectifyingsection 111 b, to be contacted with the cold liquid falling downward to condense and absorb most of the C3 components and heavier components from these vapors. - The distillation liquid flowing downward from the heat and mass transfer means in vaporizing
section 111 d inside processingassembly 111 has been stripped of ethane and lighter components. The resulting liquid product (stream 35) exits the lower region of vaporizingsection 111 d at 208° F. [98° C.], based on a typical specification of a ethane to propane ratio of 0.020:1 on a molar basis in the bottom product, and leavesprocessing assembly 111. This liquid product contains the less volatile components that were inNGL feed stream 31, which in this case are the propane and heavier components. Thedistillation vapor stream 33 arising from condensingsection 111 aleaves processing assembly 111 at 39° F. [4° C.] and 391 psia [2,694 kPa(a)], based on a typical specification of 0.75% propane in the ethane product on a molar basis, as the volatile vapor product containing the more volatile components that were inNGL feed stream 31, which in this case are the ethane and lighter components. - A summary of stream flow rates and energy consumption for the process illustrated in
FIG. 2 is set forth in the following table: -
TABLE II (FIG. 2) Stream Flow Summary - Lb. Moles/Hr [kg moles/Hr] Stream Methane Ethane Propane Butanes Pentanes+ Total 31 15 1,482 681 329 192 2,727 33 15 1,469 4 0 0 1,515 35 0 13 677 329 192 1,212 Recoveries* Propane 99.35% Butanes+ 100.00% Power Refrigerant Compression 952 HP [1,565 kW] Utility Heat Deethanizer Reboiler 17,860 MBTU/Hr [11,538 kW] *(Based on un-rounded flow rates) - A comparison of Tables I and II shows that the present invention maintains the same recoveries as the prior art. However, further comparison of Tables I and II shows that the product yields were achieved using significantly less power than the prior art. In terms of the recovery efficiency (defined by the quantity of propane recovered per unit of power), the present invention represents more than a 7% improvement over the prior art of the
FIG. 1 process. The present invention also uses nearly 1% less utility heat than the prior art of theFIG. 1 process. - The improvement in recovery efficiency provided by the present invention over that of the prior art of the
FIG. 1 process is primarily due to two factors. First, using the heat and mass transfer means in condensingsection 111 a to simultaneously cool the distillation vapor stream and condense the heavier hydrocarbon components from it provides more efficient rectification than using reflux in a conventional distillation column. As a result, the C3 components and heavier hydrocarbon components can be removed from the distillation vapor stream using less refrigeration than is possible using conventional mass transfer equipment and conventional heat transfer equipment like the prior art of theFIG. 1 process. - Second, using the heat and mass transfer means in vaporizing
section 111 d to simultaneously heat the distillation liquid stream leaving the mass transfer means in strippingsection 111 c while allowing the resulting vapors to contact the liquid and strip its volatile components is more efficient than using a conventional distillation column with external reboilers. The volatile components are stripped out of the liquid continuously, reducing the concentration of the volatile components in the stripping vapors more quickly and thereby improving the stripping efficiency for the present invention. - The present invention also offers at least two additional advantages over the prior art. First, the compact arrangement of
processing assembly 111 of the present invention replaces five separate equipment items in the prior art (fractionation tower 11,reflux condenser 12,reflux separator 13,reflux pump 14, and reboiler 15) with a single equipment item (processing assembly 111 inFIG. 2 of the present invention). This reduces the plot space requirements and eliminates the interconnecting piping, reducing the capital cost of the processing plant. Second, elimination of the interconnecting piping means that a processing plant using the present invention has far fewer flanged connections compared to the prior art, reducing the number of potential leak sources in the plant. Hydrocarbons are volatile organic compounds (VOCs), some of which are classified as greenhouse gases and some of which may be precursors to atmospheric ozone formation, which means the present invention reduces the potential for atmospheric releases that may damage the environment. - Some circumstances may favor not providing a mass transfer means above vaporizing
section 111 d, allowing the elimination of strippingsection 111 c. In such cases, the liquid portion offeed stream 31 and the liquids from either rectifyingsection 111 b (FIG. 3 ) or condensingsection 111 a (FIG. 5 ) flow directly to vaporizingsection 111 d. Likewise, some circumstances may favor not providing an absorbing means below condensingsection 111 a, allowing the elimination of rectifyingsection 111 b. In such cases, the liquid condensed from the distillation vapor enteringcondensing section 111 a is directed to either strippingsection 111 c (FIG. 4 ) or vaporizingsection 111 d (FIG. 5 ). - Some circumstances may favor producing the more volatile product as a liquid stream rather than a vapor stream. In such cases, the heat and mass transfer means inside condensing
section 111 a can be configured to totally condense either the distillation vapor stream arising from the absorbing means inside rectifyingsection 111 b (FIGS. 6 and 7 ) or the vapor portion offeed stream 31 combined with the distillation vapor stream from either strippingsection 111 c (FIG. 8 ) or vaporizingsection 111 d (FIG. 9 ). A liquid collecting means can then be used to direct a portion of the condensed liquid (reflux stream 34) to the upper region of the absorbing means in rectifyingsection 111 b (FIGS. 6 and 7 ), to strippingsection 111 c (FIG. 8 ), or to vaporizingsection 111 d (FIG. 9 ), with the remainder leavingprocessing assembly 111 as volatileliquid product 33. Again, some circumstances may favor not providing a mass transfer means above vaporizingsection 111 d, allowing the elimination of strippingsection 111 c. In such cases, the liquid portion offeed stream 31 and either the liquids from rectifyingsection 111 b (FIG. 7 ) orreflux stream 34 from condensingsection 111 a (FIG. 9 ) flow directly to vaporizingsection 111 d. Likewise, some circumstances may favor not providing an absorbing means below condensingsection 111 a, allowing the elimination of rectifyingsection 111 b. In such cases,reflux stream 34 from condensingsection 111 a is directed to either strippingsection 111 c (FIG. 8 ) or vaporizingsection 111 d (FIG. 9 ). - The present invention can be used to effect the desired separation between any components of different volatilities in a liquid hydrocarbon stream as required by the particular circumstances by appropriate adjustment of the operating conditions. For instance, the present invention can be used to separate C3 components and lighter components from a liquefied petroleum gas (LPG) stream, so that the C4 components and heavier components remain in the less volatile liquid product. The present invention can also be used to process a vapor hydrocarbon stream or a hydrocarbon stream containing a mixture of liquid and vapor.
- While there have been described what are believed to be preferred embodiments of the invention, those skilled in the art will recognize that other and further modifications may be made thereto, e.g. to adapt the invention to various conditions, types of feed, or other requirements without departing from the spirit of the present invention as defined by the following claims.
Claims (16)
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CA2923447C (en) | 2022-05-31 |
US9790147B2 (en) | 2017-10-17 |
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WO2015038288A1 (en) | 2015-03-19 |
US20170355653A1 (en) | 2017-12-14 |
MX2016003030A (en) | 2016-05-24 |
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