Classifications

• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
  • F25J3/0209—Natural gas or substitute natural gas
• • 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
  • C10L3/10—Working-up natural gas or synthetic natural gas
• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
  • F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom or more
• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
  • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
  • F25J3/0238—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/0605—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the feed stream
  • F25J3/061—Natural gas or substitute natural gas
• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/0635—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 1 carbon atom or more
• • 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
  • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
  • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
  • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
  • F25J3/064—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 2 carbon atoms or more
• • 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
  • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
  • F25J5/002—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger
• • 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
  • F25J2200/00—Processes or apparatus using separation by rectification
  • F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
• • 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
  • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
  • F25J2240/30—Dynamic liquid or hydraulic expansion with extraction of work, e.g. single phase or two-phase turbine
• • 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
  • F25J2240/00—Processes or apparatus involving steps for expanding of process streams
  • F25J2240/40—Expansion without extracting work, i.e. isenthalpic throttling, e.g. JT valve, regulating valve or venturi, or isentropic nozzle, e.g. Laval
• • 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
  • F25J2270/00—Refrigeration techniques used
  • F25J2270/02—Internal refrigeration with liquid vaporising loop
• • 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
  • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
  • F25J2290/42—Modularity, pre-fabrication of modules, assembling and erection, horizontal layout, i.e. plot plan, and vertical arrangement of parts of the cryogenic unit, e.g. of the cold box
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall

Definitions

• the present invention relates to the cooling of fluids through the self-cooling from the fluid. More particularly this invention goes to the cooling of a fluid to self-cool the fluid and to cool and separate the self-cooled fluid.
• One of the methods is a cascade method using a series of shell and tube heat exchangers. These shell and tube heat exchangers are very large and very expensive, and present problems of economics and feasibility for remote and smaller natural gas fields. It would be desirable to have a device for liquefying natural gas that is compact and relatively inexpensive to ship and use in remote locations, especially for natural gas fields found under the ocean floor, where collection and liquefaction of the natural gas can be performed on board a floating platform using a compact unit. [0004] There is also an increasing demand for methods of cooling gases to condense them for transport or for separation purposes. The self cooling provides an opportunity to separate fluids that will generate liquids during the cooling process. Improvements over the current commercial design can include lower cost, lower weight, and provide a more compact structure as well as provide improved heat transfer characteristics, for providing for on site separation of hydrocarbons.
• the use of a compact self-cooling heat exchanger for separating a fluid mixture is disclosed.
• the heat exchanger is made up of a plurality of plates and each plate has at least two channels defined in the plate.
• a fluid mixture is passed through a heat exchanger and cooled.
• the fluid mixture is expanded through a controlled expansion to provide the desired cooling load, and conditions for passing the expanded fluid mixture to a separation unit.
• the fluid mixture is expanded to create a two phase mixture of liquid and vapor.
• the two phase mixture is passed to a separation unit, where a first process stream enriched in at least one component is produced, and a second process stream enriched in at least a second component is produced.
• the first process stream and the second process stream are passed to the heat exchanger and provide cooling to the feed mixture passed into the heat exchanger.
• the fluid mixture being cooled by passing through the heat exchanger, can be separated in a separation unit, upon which both streams can be expanded separately and generate the cooling load. Both expanded streams are then passed back to the heat exchanger, to provide the cooling to the feed mixture.
• the location of the diversion of the fluid mixture to the separation unit and its potential re -introduction into the heat exchange device can be chosen such that the separation proceeds under conditions of optimum energy efficiency.
• Figure 1 is a diagram of the separation through self cooling process
• Figure 2 is a diagram of the separation process with liquids separated at an intermediate stage of cooling
• Figure 3 is a diagram of the process using a self-cooling refrigerant.
• LNG liquefied natural gas
• Natural gas is typically recovered from gas wells that have been drilled and is in the gas phase at high pressure. The high pressure gas is then treated and passed to a pipeline for transport.
• the present invention is directed to a heat exchanger for cooling the natural gas at the gas wells.
• the present invention provides for the separation of components of a mixture using self-cooling of the mixture to facilitate the separation process.
• the heat exchanger of the present invention is fabricated by plates that are bonded together to form an integral unit. The plates have channels etched, milled, pressed, stamped, inflated, or by other methods known in the art, into them for the transport fluid or fluids.
• the channels are covered and form conduits through which fluids can flow.
• the bonding method will depend on the materials of construction, such as with aluminum plates, bonding involves brazing the aluminum plates together. With steel, diffusion bonding or welding can be performed to bond the steel plates together. Other means of bonding plates are known to those skilled in the art.
• Fluid access to the plurality of plates can be provided through one or more manifolds, wherein each manifold includes at least one channel that is in fluid communication with all corresponding channel inlets or channel outlets of the plates. [OO 12]
• the present invention takes advantage of the use of a compact self-cooling heat exchanger to separate the components of a mixture. A simplified form of the process is shown in Figure 1.
• One plate 10 of the self-cooling heat exchanger is shown, where a mixture enters a first channel 12.
• the mixture passes through an expansion device 20, where the fluid is expanded substantially adiabatically and cools the fluid.
• the fluid can become an intermediate two phase fluid comprising a liquid and vapor phase.
• the expanded fluid, or intermediate stream is passed through part of the heat exchanger to provide a portion of the self-cooling of the mixture.
• the intermediate stream is passed to a separation unit 30 wherein the intermediate stream is separated into a first stream 32 and a second stream 34.
• the first stream 32 is passed back to the self-cooling heat exchanger through a second channel 22 to contribute to the cooling of the fluid mixture in the first channel 12.
• the second stream 34 can also be passed through the heat exchanger in a third channel 24 to further contribute to the cooling of the mixture in the first channel 12.
• the separation can comprise separating a liquid and vapor, such that the first stream 32 is a vapor stream and the second stream 34 is a liquid stream.
• the channels 12, 22, 24 are substantially parallel to provide good heat transfer characteristics, the flow of the first stream 32 in the second channel 22 is in a counter current direction relative to the flow of the mixture in the first channel 12.
• the flow of the second stream 34 in the third channel 24 is also in a counter current direction relative to the flow of the mixture in the first channel 12. It is preferred that both streams 32 and 34 are passed back through the heat exchanger.
• the efficiency of the heat exchanger is partially dependent on the form of the hot and cold composite curves in the temperature-enthalpy diagram (T, h). Maintaining the slopes of the two temperature-enthalpy curves to be substantially parallel and in close proximity to each other, substantially sets the efficiency of the cooling process.
• the slopes of the curves are related to the total enthalpy, the mass flows and the heat capacity of the various streams, through the formula dT/dh - l/(m*Cp).
• the re- introduction of all mass of the separated streams back into the exchanger impacts the slope of the composite curves and allows them to be substantially more parallel to each other, which, in turn, allows the process to run more efficiently.
• the expansion device such as an orifice or restriction, is for controlling the expansion of the fluid mixture.
• One expansion device 20 can be a Joule-Thomson valve, comprising a conic shaped needle valve that matches a conic shaped seat.
• the Joule-Thomson valves in each plate can be commonly connected through a shaft that extends through each valve.
• the expansion device 20 can be a mechanical device for extracting work.
• One example for extracting work is a micro-turbine, such that during the expansion, the micro-turbine is connected through a drive shaft to an external device for performing work, such as a generator.
• the amount of energy recovered, or conversely, the level of fluid expansion attained can be controlled by means of variable resistance to the drive shaft of the turbine, or turbines. This allows operation according to the cooling demand required.
• the intermediate stream passed to the separation unit 30 can be expanded to cool the intermediate stream and produce a two phase stream.
• the two phase stream can be separated in a separation unit 30 to produce a liquid phase 34 bottoms stream and a vapor phase 32 overhead stream.
• the separation unit 30 can be a simple vapor-liquid separator, or can comprise a fractionation column for producing two streams having increased purity over a simple vapor-liquid separator.
• the vapor phase 32 will be richer in at least one component of the mixture, and the liquid phase 34 will be richer in at least one other component of the mixture.
• the mixture is natural gas, as extracted from the ground, the mixture is at a high pressure and at a relatively warm temperature.
• the mixture contains natural gas liquids (NGL), which can be recovered upon cooling of the natural gas mixture.
• Natural gas liquids comprise C3 and higher hydrocarbons, and some ethane that can be found in natural gas.
• NNL natural gas liquids
• the process comprises passing a mixture to a heat exchanger. In each plate 10 of the heat exchanger, the mixture is partially cooled in a first channel 12.
• the mixture can comprise a two phase stream of vapor and liquid, and with partial cooling can increase the liquid content of the stream.
• the mixture is passed to a separation unit 30, where the mixture is separated into a vapor stream 32 and a liquid stream 34.
• the vapor stream 32 is passed to the heat exchanger to a second channel 22.
• the vapor stream 32 is expanded through and expansion device 20 to produce a cooled stream.
• the cooled stream can comprise a two phase stream of liquid and vapor, or can remain a vapor stream.
• the cooled vapor stream in the second channel 22 flows in a generally counter current direction to flow of the mixture in the first channel 12, providing cooling for the mixture.
• the liquid stream 34 is passed to the heat exchanger to a third channel 24 and is cooled by the cooled vapor stream.
• the partial cooling and separation can remove natural gas liquids from the natural gas feed, and, in doing so, make sure the natural gas has the right energy content prior to liquefaction.
• a third design for the process is presented in Figure 3.
• the figure presents one plate 10 that is part of a larger heat exchanger comprising a plurality of plates.
• the process is for separating and cooling a mixture by creating a stream comprising a vapor and a liquid.
• the mixture is passed to a channel 12 in a heat exchanger and partially cooled.
• the partially cooled mixture is passed to a separation unit 30 where a vapor stream 32 and a liquid stream 34 are created.
• the vapor stream 32 is passed to a second channel 22 for cooling, and the liquid stream 34 is passed to a third channel 24 for cooling.
• a refrigerant is used to self-cool the refrigerant and to cool the vapor stream 22, the liquid stream 24 and the mixture 12.
• the refrigerant is passed to a fourth channel 32 where the refrigerant is cooled.
• the refrigerant is expanded through an expansion device 20, to produce an expanded and cooled refrigerant.
• the cooled refrigerant is passed back through fifth channel 34 providing cooling to the refrigerant in the fourth channel 32.
• the expansion is controlled to generate the desired cooling load for the refrigerant and for the mixture, and for the liquid and vapor streams.
• the process of the present invention provides for the separation of hydrocarbon mixtures by using the cooling effect of the hydrocarbon mixture when expanded under substantially adiabatic conditions.
• One hydrocarbon mixture of interest is natural gas. When natural gas is recovered, it needs to be processed before transport. This is particularly true for natural gas recovered in remote locations where access to a pipeline is not available.
• the natural gas can be fed to a heat exchanger to be expanded and cooled to cool the natural gas, and to separate out the natural gas liquids, and further using the separated natural gas and natural gas liquids to contribute to the cooling of the natural gas feed.
• the process is also applicable to other hydrocarbon mixtures.
• Mixtures of paraffins and olefins can be separated by cooling and performing cryogenic separation.
• propane and propylene where propane has a boiling point of -42 0 C and propylene has a boiling point of -47.6 0 C at atmospheric pressure. Cooling a propane/propylene mixture to form a two phase system at a low temperature, and then passing the cooled mixture to a fractionation column permits separation. The separated streams are then passed back to the heat exchanger to provide cooling of the feed stream mixture.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Separation By Low-Temperature Treatments (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

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• 2009
  • 2009-06-16 US US12/485,269 patent/US20100313598A1/en not_active Abandoned
• 2010
  • 2010-05-26 CA CA2765519A patent/CA2765519A1/en not_active Abandoned
  • 2010-05-26 BR BRPI1011503A patent/BRPI1011503A2/pt not_active IP Right Cessation
  • 2010-05-26 WO PCT/US2010/036114 patent/WO2010147740A2/en active Application Filing
  • 2010-05-26 MY MYPI2011005960A patent/MY160151A/en unknown

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