WO2016200053A1 - 에틸렌을 회수하기 위한 분리방법 및 분리공정 시스템 - Google Patents
에틸렌을 회수하기 위한 분리방법 및 분리공정 시스템 Download PDFInfo
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- WO2016200053A1 WO2016200053A1 PCT/KR2016/004462 KR2016004462W WO2016200053A1 WO 2016200053 A1 WO2016200053 A1 WO 2016200053A1 KR 2016004462 W KR2016004462 W KR 2016004462W WO 2016200053 A1 WO2016200053 A1 WO 2016200053A1
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- ethylene oligomerization
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/005—Processes comprising at least two steps in series
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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
- 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
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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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/135—Purification; Separation; Use of additives by gas-chromatography
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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
- 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
- F25J3/0219—Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature
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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
- 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
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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
- F25J2200/00—Processes or apparatus using separation by rectification
- F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
- F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
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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
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/62—Ethane or ethylene
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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
- F25J2270/00—Refrigeration techniques used
- F25J2270/02—Internal refrigeration with liquid vaporising loop
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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
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
Definitions
- the present invention relates to a separation process and separation process system for the easy recovery of ethylene from ethylene oligomerization reactants comprising unreacted ethylene.
- Linear alpha-olefins are widely used commercially as important substances used in comonomers, detergents, lubricants, plasticizers, etc.
- 1-hexene and 1-octene are used in the production of linear low density polyethylene (LLDPE). It is widely used as a comonomer for adjusting the density.
- Such linear alpha-olefins such as 1-hexene and 1-octene are typically produced through oligomerization of ethylene.
- the ethylene oligomerization reaction is carried out by oligomerization reaction (trimerization or tetramerization reaction) of ethylene using ethylene as a reactant, and the desired product 1-hexene and 1-octene which is a product produced through the reaction Multi-reactor hydrocarbon mixtures as well as unreacted ethylene.
- the product is subjected to a separation process through a distillation column, where unreacted ethylene is recovered and reused in the ethylene oligomerization reaction.
- a conventional process for recovering unreacted ethylene was performed through a process system including a distillation column 200, a condenser 63, a reflux drum 80, and a reboiler 73.
- the ethylene oligomerization reactant is supplied to the distillation column 200 through the reactant supply line 10 so that the upper fraction containing a relatively large amount of ethylene is transferred to the condenser 63 through the overhead discharge line 60 to condense. It is then introduced into the reflux drum (80).
- the liquid phase of the upper fraction in the reflux drum 80 is reintroduced to the distillation column 200 through the first reflux line 61, the gas phase is discharged through the first recovery line 62.
- the lower fraction containing 1-hexene and 1-octene is introduced into the reboiler 73 through the bottom discharge line 70, and then vaporized to be reintroduced into the distillation column through the second reflux line 71 or the first fraction. 2 is discharged through the recovery line (72).
- a process for recovering conventional unreacted ethylene includes a first flashing column 100, a distillation column 200, a condenser 63, a reflux drum 80, and a reboiler 73. It was carried out through a process system.
- the ethylene oligomerization reactant is fed to the first flashing column 100 through the reactant feed line 10 so that the top fraction comprising a relatively large amount of ethylene is discharged through the first overhead discharge line 30.
- the bottom fraction containing the residual ethylene is recovered and supplied to the distillation column 200 through the first bottom discharge line 40.
- the upper fraction containing a relatively large amount of ethylene is transferred to the condenser 63 through the second overhead discharge line 60 to condense and then flows into the reflux drum 80.
- the liquid phase of the upper fraction in the reflux drum 80 is reintroduced to the distillation column 200 through the first reflux line 61, the gas phase is discharged through the first recovery line 62.
- the lower fraction including 1-hexene and 1-octene is introduced into the reboiler 73 through the second column bottom discharge line 70, and then vaporized to be distilled through the second reflux line 71. To be reintroduced or discharged through the second recovery line 72.
- Patent Document 1 KR2015-0006067 A
- Patent Document 2 US7718838 B2
- Patent Document 3 EP2738151 B1
- an object of the present invention is to provide a separation method for easily recovering ethylene from the ethylene oligomerization reactants.
- Another object of the present invention is to provide a separation process system for easily recovering ethylene from ethylene oligomerization reactants.
- the present invention comprises the steps of cooling the ethylene oligomerization reactant (step 1); Flashing the cooled reactant to separate the first upper fraction and the first lower fraction (step 2); Introducing the first lower fraction into a distillation column to recover a second upper fraction from the column top, and recovering the second lower fraction from the column bottom (step 3); And condensing the recovered second upper fraction with at least a portion of the first lower fraction by first heat exchange to condense (step 4), wherein at least a portion of the first lower fraction is after the first heat exchange with the second upper fraction. It provides a separation method for recovering the ethylene from the ethylene oligomerization reactant to be subjected to a second heat exchange with the reactant of step 1.
- the present invention also provides a supply unit for supplying the ethylene oligomerization reactant; A cooling unit connected to the supply unit and cooling the reactant; And a treatment part connected to the cooling part and separating ethylene from the cooled reactant, wherein the processing part comprises: a flashing part in which at least one flashing column is disposed; A recovery unit including a distillation column, a condenser, and a reboiler, wherein the cooling unit and the treatment unit are connected to a cooling line and a circulation line circulating through the treatment unit, provides a separation process system for recovering ethylene from the ethylene oligomerization reactant. .
- the separation method for recovering ethylene from the ethylene oligomerization reactant according to the present invention can easily reflux ethylene without reducing or eliminating the use of a condensation system using an expensive refrigerant, etc., thereby improving economic efficiency and increasing separation efficiency. Can be.
- the separation method for recovering ethylene from the ethylene oligomerization reactant according to the present invention can reduce the amount of heat used in the reboiler can be improved process efficiency.
- Figure 1 schematically shows a process system for recovering ethylene from a conventional general ethylene oligomerization reactant.
- Figure 2 schematically shows a process system with a flashing column for recovering ethylene from conventional ethylene oligomerization reactants.
- Figure 3 schematically shows a process system with an adiabatic flashing column for recovering ethylene from an ethylene oligomerization reactant according to one embodiment of the invention.
- Figure 4 schematically shows a process system with a high pressure flashing column and an adiabatic flashing column for recovering ethylene from an ethylene oligomerization reactant according to one embodiment of the present invention.
- the present invention provides a separation process for recovering ethylene from ethylene oligomerization reactants that can easily recover unreacted ethylene while reducing economic costs.
- linear alpha olefins such as 1-hexene and 1-octene are widely used commercially as important substances used in comonomers, cleaners, lubricants, plasticizers, etc.
- linear alpha olefins such as 1-hexene and 1-octene are typical. It is prepared through the ethylene oligomerization reaction. The product produced through the ethylene oligomerization reaction contains a large amount of unreacted ethylene as well as a multicomponent hydrocarbon mixture including 1-hexene and 1-octene, and is unreacted to increase process efficiency. Ethylene is separated and recovered for reuse in the ethylene oligomerization reaction.
- Separation and recovery of the unreacted ethylene may be performed through a distillation column, and refluxed using a large amount of refrigerant to increase recovery efficiency.
- the method using the refrigerant has a problem that the economic efficiency is not good because of the high refrigerant and the need to build a separate refrigeration system. Therefore, in order to increase economic utility, a method for separating and recovering ethylene at a lower cost is required.
- the present invention can improve the economic efficiency and improve the separation efficiency by reducing condensation of ethylene easily and reflux without using or eliminating the use of a reflux system using an expensive refrigerant, process by reducing the amount of heat used in the reboiler process
- a separation method for recovering ethylene from ethylene oligomerization reactants that can improve efficiency.
- the separation method comprises the steps of cooling the ethylene oligomerization reactant (step 1); Flashing the cooled reactant to separate the first upper fraction and the first lower fraction (step 2); Introducing the first lower fraction into a distillation column to recover a second upper fraction from the column top, and recovering the second lower fraction from the column bottom (step 3); And condensing the recovered second upper fraction with at least a portion of the first lower fraction by first heat exchange to condense (step 4), wherein at least a portion of the first lower fraction is after the first heat exchange with the second upper fraction. It characterized in that the second heat exchange with the reactant of step 1.
- the separation method according to an embodiment of the present invention is characterized in that performed by a continuous process that is rotated at least two or more times.
- cycle indicates that the same process is a cycle repeated several times, for example, may indicate that the step 1 to step 4 of the separation method can be repeated several times in sequence.
- Step 1 is a step for cooling the relatively high temperature and high pressure ethylene oligomerization reactant.
- the ethylene oligomerization reactant before cooling may have a temperature range of 50 ° C. to 100 ° C. and a high pressure of at least 60 bar, wherein the cooling is such that the ethylene oligomerization reactant is in a range of 30 ° C. to 50 ° C. and a pressure of 55 bar to 60 bar It may be to have.
- the cooling may be performed by a different method according to the rotational order, for example, may be performed using the cooling water according to the rotational order, or may be performed using at least a portion of the first lower fraction to be described later.
- the cooling may be performed by using the cooling water at the first rotation, that is, when the initial separation process is started, and from the second rotation after the first rotation, the cooling may be performed at least a part of the first lower fraction. It may be to use. At this time, at least a part of the first lower fraction may be after the first heat exchange with the second upper fraction as described later.
- the cooling when the cooling is performed using at least a portion of the first bottom fraction, the cooling may be performed by at least a portion of the first bottom fraction and a second heat exchange of the ethylene oligomerization reactant.
- the second heat exchange may be performed by a temperature difference between at least a portion of the first lower fraction and the ethylene oligomerization reactant after the first heat exchange, and at least a portion of the first lower fraction and the ethylene oligomerization reactant before the second heat exchange May have a temperature difference of 30 ° C to 125 ° C.
- the ethylene oligomerization reactant may be produced by the ethylene oligomerization reaction, the ethylene oligomerization reaction may be an ethylene trimerization reaction or ethylene tetramerization reaction.
- the ethylene oligomerization reactant may be a plural phase multicomponent hydrocarbon comprising ethylene oligomerization product, polymer product and unreacted ethylene.
- the ethylene oligomerization reaction may mean that the ethylene is small polymerized, and may be called trimerization or tetramerization according to the number of ethylene polymerized, and collectively referred to as multimerization ( multimerization).
- the ethylene oligomerization reaction according to an embodiment of the present invention may be to selectively prepare 1-hexene and 1-octene as main comonomers of linear low density polyethylene (LLDPE).
- LLDPE linear low density polyethylene
- the catalyst system may include a transition metal source serving as a main catalyst, a cocatalyst and a ligand compound, and the structure of the active catalyst may be changed according to the chemical structure of the ligand compound, thereby selecting the product. May appear differently.
- the ligand compound includes two or more groups represented by the following Chemical Formula 1 in a molecule, and is a group connecting each of the two or more groups with four carbon atoms, and an aliphatic group having 1 to 20 carbon atoms and an alicyclic group having 3 to 20 carbon atoms. It may include a group and a group in which two or more selected from the group consisting of aromatic groups having 6 to 20 carbon atoms are bonded.
- R 1 to R 4 are each independently an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an arylalkyl group having 7 to 20 carbon atoms, and having 7 to 20 carbon atoms. It may be an alkylaryl group or an alkoxyaryl group having 7 to 20 carbon atoms.
- the ligand compound includes two or more diphosphinoamine functional groups, the diphosphinoamine functional groups are connected by four carbon atoms, and the group connecting the diphosphinoamine functional groups is an aliphatic group having 1 to 20 carbon atoms. It may have a group having two or more selected from the group consisting of alicyclic group having 3 to 20 carbon atoms and aromatic group having 6 to 20 carbon atoms.
- the transition metal source serves as a main catalyst, such as chromium (III) acetylacetonate, chromium trichloride tristetrahydrofuran, chromium (III) -2-ethylhexanoate and chromium (III) tris (2,2, 6,6-tetramethyl-3,5-heptanedionate) may be one or more selected from the group consisting of.
- the cocatalyst is an organometallic compound including a Group 13 metal, and generally, the cocatalyst is not particularly limited as long as it can be used when multiplying ethylene in the presence of the main catalyst.
- the promoter may be one or more of the compounds represented by the following Chemical Formulas 2 to 4.
- R 5 is a halogen radical, a hydrocarbyl radical having 1 to 20 carbon atoms, or a hydrocarbyl radical having 1 to 20 carbon atoms substituted with halogen, and c is an integer of 2 or more.
- the compound represented by Chemical Formula 2 may be modified methyl aluminoxane (MMAO), methyl aluminoxane (MAO), ethyl aluminoxane, isobutyl aluminoxane, butyl aluminoxane, or the like.
- MMAO methyl aluminoxane
- MAO methyl aluminoxane
- ethyl aluminoxane isobutyl aluminoxane
- butyl aluminoxane or the like.
- D is aluminum or boron
- R6 is independently hydrogen or halogen, hydrocarbyl having 1 to 20 carbon atoms or hydrocarbyl having 1 to 20 carbon atoms substituted with halogen.
- the compound represented by Formula 3 is trimethyl aluminum, triethyl aluminum, triisobutyl aluminum, tripropyl aluminum, tributyl aluminum, dimethyl chloro aluminum, dimethyl isobutyl aluminum, dimethyl ethyl aluminum, diethyl chloro aluminum, tri Isopropyl aluminum, tri-s-butyl aluminum, tricyclopentyl aluminum, tripentyl aluminum, triisopentyl aluminum, trihexyl aluminum, ethyl dimethyl aluminum, methyl diethyl aluminum, triphenyl aluminum, tri-p-tolyl aluminum, dimethyl Aluminum methoxide, dimethyl aluminum ethoxide, trimethyl boron, triethyl boron, triisobutyl boron, tripropyl boron, tributyl boron and the like.
- L is a neutral Lewis base
- [LH] + is a Bronsted acid
- Q is boron or aluminum in a +3 type oxidation state
- E is independently from each other one or more hydrogen atoms are halogen, having 1 to 4 carbon atoms.
- the compound represented by the formula (4) is triethylammonium tetraphenylboron, tributylammonium tetraphenylboron, trimethylammonium tetraphenylboron, tripropylammonium tetraphenylboron, trimethylammonium tetra (p-tolyl) boron, tthipropyl Ammonium tetra (p-tolyl) boron, triethylammonium tetra (o, p-dimethylphenyl) boron, trimethylammonium tetra (o, p-dimethylphenyl) boron, tributylammonium tetra (p-trifluoromethylphenyl) boron, Trimethylammonium tetra (p-trifluoromethylphenyl) boron, tributylammoniumtetrapentafluorophenylboron, N
- the catalyst system including the ligand compound, the main catalyst, and the promoter has a molar ratio of ligand: transition metal source: promoter in order to increase selectivity and increase multimerization activity. 1: 10,000, specifically, from 0.5: 1: 100 to about 5: 1: 3,000.
- the ligand compounds, transition metal sources and promoters may be added together in the presence or absence of monomers in any suitable solvent, simultaneously or sequentially in any order, to obtain an active catalyst.
- the solvent may include heptane, toluene, cyclohexane, methylcyclohexane, 1-hexene, diethyl ether, tetrahydrofuran, acetonitrile, dichloromethane, chloroform, chlorobenzene, methanol, acetone, and the like.
- the oligomerization reaction of ethylene is carried out in a homogeneous liquid phase reaction, slurry reaction, two-phase liquid / liquid reaction or bulk in the presence or absence of an inert solvent using the catalyst system and conventional apparatus and contacting techniques. Phase reaction or gas phase reaction.
- the inert solvent may be, for example, benzene, toluene, xylene, cumene, heptane, cyclohexane, methylcyclohexane, methylcyclopentane, hexane, pentane, butane, isobutane and the like.
- a small amount of water or air acting as a catalyst poison can be removed by treating the solvent with a small amount of alkylaluminum.
- the ethylene oligomerization reaction may be carried out in the presence of the catalyst system, under high pressure of 60 bar and temperature conditions of 50 °C to 100 °C.
- Step 2) is a step of flashing the cooled reactant and separating the first upper fraction and the first lower fraction to obtain a first upper fraction and a first lower fraction from the cooled reactant.
- the separated first upper fraction may have a high content of ethylene in the fraction
- the first lower fraction may have a low content of ethylene in the fraction. That is, the first upper fraction is an ethylene rich fraction, and the components in the fraction may be mostly ethylene, and the first lower fraction is an ethylene deficient fraction, and a plurality of multicomponents including ethylene oligomerization products and polymer products, including ethylene in the fraction, It may be one containing a hydrocarbon.
- At least a portion of the first lower fraction may be used as a refrigerant for condensing the second upper fraction recovered from the column top of the distillation column described below, and the flashing may serve as at least a portion of the first lower fraction as a refrigerant.
- the second upper fraction may be adjusted so as to have a temperature difference of a predetermined range.
- the flashing may be performed under conditions such that the temperature of the first lower fraction is 3 ° C. or more, specifically 5 ° C. to 50 ° C. lower than the temperature of the second upper fraction.
- at least a portion of the first lower fraction and the second upper fraction may have a temperature difference of 3 ° C. or more, specifically 5 ° C. to 50 ° C.
- At least a portion of the first lower fraction may be the same as the first lower fraction and only to indicate that it is part of the first lower fraction. That is, at least a part of the first lower fraction may mean the first lower fraction itself or may mean a part divided from the first upper fraction.
- the flashing condition is not particularly limited, but more specifically, the flashing is performed under the following conditions. Can be.
- the flashing of step 2) may be a one-stage adiabatic flashing under conditions such that a first upper fraction and a first lower fraction in a pressure range of 5 bar to 20 bar are produced from the cooled reactant.
- the pressure of the first upper fraction and the first lower fraction may be equal to the process pressure in the distillation column performed after flashing, or lower than the process pressure in the distillation column within the pressure range.
- the flashing of step 2) may be performed by first high pressure flashing to generate a third upper fraction and a third lower fraction before adiabatic flashing under conditions such that the first upper fraction and the first lower fraction are generated. It may be performed by two-step flashing to perform adiabatic flashing.
- the third upper fraction and the third lower fraction may be in a higher pressure state than the first upper fraction and the first lower fraction, respectively, and the third upper fraction may be an ethylene rich fraction like the first upper fraction described above.
- the third lower fraction may be an ethylene deficient fraction like the first lower fraction.
- the first and third top fractions can be circulated and reused in the ethylene oligomerization reaction.
- step 3 in order to separate and recover ethylene from the first bottom fraction, the first bottom fraction is introduced into a distillation column to recover a second upper fraction from the column top and a second bottom fraction from the column bottom.
- the second upper fraction may be an ethylene-rich fraction like the first upper fraction described above, and the second lower fraction may not include ethylene.
- the distillation column may have a condition in which the second upper fraction recovered from the column top has a temperature of ⁇ 20 ° C. to 25 ° C. under a pressure condition of 5 bar to 20 bar.
- the separation method according to an embodiment of the present invention may further include filtering the first bottom fraction before performing step 3).
- the filtration is not particularly limited and may be performed by a conventional method known in the art, for example, it may be performed using a filter or a decanter.
- the first bottom fraction may remove polymer product and other impurities by the filtration.
- Step 4 is condensing the second top fraction to reintroduce at least a portion of the second top fraction recovered in step 3 into the distillation column.
- the method through step 4 according to an embodiment of the present invention can perform a process for achieving the above object without using an expensive refrigerant separately, thereby reducing the economic cost.
- the condensation may be performed by first heat exchanging at least a portion of the first lower fraction and the second upper fraction. That is, the condensation according to an embodiment of the present invention may be performed by a temperature difference between at least a portion of the first lower portion and the second upper portion. At least a portion of the first lower fraction and the second upper fraction before the first heat exchange may have a temperature difference of 3 ° C. or more as described above, wherein at least a portion of the first lower fraction before the first heat exchange is ⁇ 28 ° C. It may be to have a temperature of 7 °C.
- At least a portion of the first bottom fraction after the first heat exchange can be circulated and used to cool the ethylene oligomerization reactant of step 1 as described above.
- the cooling may be performed by a second heat exchange due to a temperature difference between at least a portion of the first lower fraction after the first heat exchange and the ethylene oligomerization reactant as described above.
- At least a portion of the first bottom fraction after the second heat exchange may be introduced into the distillation column together with the first bottom fraction of step 3), wherein at least a portion of the second top fraction after the heat exchange is condensed and reintroduced to the top of the distillation column. And the remainder can be circulated and reused in the ethylene oligomerization reaction.
- the present invention also provides a separation process system for recovering ethylene from ethylene oligomerization reactants.
- the separation process system can be used to perform the separation process through the above separation method.
- the separation process system is a supply unit for supplying the ethylene oligomerization reactant; A cooling unit connected to the supply unit and cooling the reactant; And a treatment part connected to the cooling part and separating ethylene from the cooled reactant, wherein the processing part comprises: a flashing part in which at least one flashing column is disposed; And a recovery unit including a distillation column, a condenser, and a reboiler, wherein the cooling unit and the processing unit are connected by a circulation line circulating through the cooling unit and the processing unit.
- the supply unit may include a supply line 10 for supplying the ethylene oligomerization reactant to the cooling unit, and the cooling unit may include a transfer line 20 for transferring the cooled reactant to the processing unit.
- the cooling unit may be provided with a heat exchanger (11).
- the processing unit may include a flashing unit in which at least one flashing column is disposed as described above; It may include a recovery unit including a distillation column, a condenser and a reboiler.
- cooling unit and the processing unit may be connected to a circulation line connecting the cooling unit and the processing unit as described above.
- the flashing unit may include a first flashing column 100 that performs adiabatic flashing, and the first flashing column 100 circulates a first upper fraction. It may include a top discharge line 30 and the first bottom discharge line 40 for transferring the first lower fraction to the recovery unit (see Figure 3).
- the flashing unit may be a second flashing column 110 for performing high pressure flashing and the first flashing column 100 for performing adiabatic flashing are arranged in sequence
- the second flashing column 110 may include a third top discharge line 31 for circulating the third top fraction and a third bottom discharge line 32 for transferring the third bottom fraction to the first flashing column 100.
- the first flashing column 100 may include a first top discharge line 30 circulating the first upper fraction and a first bottom discharge line 40 transferring the first bottom fraction to the recovery unit. (See Figure 4).
- the circulation line 50 may be a first bottom discharge line 40, the condenser 63 and the heat exchanger 11 of the cooling unit is sequentially connected to circulate at least a portion of the first lower fraction. That is, at least a part of the first lower fraction may be transferred to the condenser 63 through the circulation line 50 to be used as a refrigerant for condensing the second upper fraction, and then transferred to the heat exchanger 11. It can be used to cool the ethylene oligomerization reactant, and then may be circulated to the first bottom discharge line 40 and sent to the recovery unit.
- the recovery part is connected to the flashing part to recover ethylene from the first lower fraction transferred through the first bottom discharge line 40, and the distillation column 200 connected to the first bottom discharge line 40. And a condenser 63, a reboiler 73, and a reflux drum 80, wherein the distillation column 200 recovers the second overhead discharge line 60 and the second bottom fraction for recovering the second upper fraction.
- the second top discharge line 60 is connected to the condenser 63 at the top of the distillation column 200
- the second bottom discharge line 70 is a distillation column ( 200 may be connected to the reboiler 73 from the bottom.
- the condenser 63 may be connected to a first reflux line 61 for reintroducing at least a portion of the second upper fraction into the top of the distillation column 200, wherein the reboiler 73 is at least a portion of the second.
- a second reflux line 71 may be connected to reintroduce the bottom fraction into the bottom of the distillation column 200.
- the second upper fraction is transferred to the condenser 63 through the second overhead discharge line 60, and the condenser 63 uses at least a portion of the first lower fraction conveyed through the circulation line 50 as a refrigerant. May be used to condense the second upper fraction.
- the condenser 63 may be connected to a separate condensation system using a refrigerant, and the condensation system may be used by appropriately adjusting as needed when condensing the second upper fraction.
- the condensed second upper fraction may be transferred to the reflux drum 80 through the first reflux line 61.
- the second upper fraction of the gas phase and the second upper fraction of the liquid phase may coexist, and the liquid phase and the gas phase are separated through the reflux drum 80, so that the second upper fraction of the liquid phase is formed in the first upper fraction. It is reintroduced to the top of the distillation column 200 through the reflux line 61, the second upper fraction of the gas phase may be discharged through the first recovery line 62, or circulated and reused in the ethylene oligomerization reaction.
- the second bottom fraction transferred to the reboiler 73 through the second bottom discharge line 70 is vaporized and reintroduced into the bottom of the distillation column 200 through the second reflux line 71, or a second recovery. May exit through line 72.
- the following examples and comparative examples simulated the separation method according to the present invention using a commercial process simulation program ASPEN PLUS.
- the constants required for the simulations include values embedded in the program, values described in the literature, and values obtained from existing ethylene separation and manufacturing processes.
- the process system as shown in FIG. 3 was designed.
- the ethylene oligomerization reactant containing 38.5 wt% of ethylene is transferred to the heat exchanger 11 through the supply line 10 and cooled using cooling water, and then the cooled reactant is transferred to the adiabatic flashing column 100 through the transfer line 20. And flashed.
- the ethylene oligomerization reactant before cooling was set to 60 °C, 60 bar
- the cooling was set to a condition that the ethylene oligomerization reactant can be 40 °C, 60 bar after cooling.
- the flashing was set to a condition where the pressure was lowered to 10 bar to obtain a first upper fraction and a first lower fraction having a temperature of -5 ° C.
- the process pressure of the distillation column was fixed at 10 bar and set so that the second upper fraction discharged had a temperature of 18 ° C.
- the second top fraction discharged to a temperature of 18 ° C. was condensed to 8 ° C. through heat exchange with at least a portion of the first bottom fraction, and at least a portion of the first bottom fraction exhibited an elevated temperature of 0 ° C. after heat exchange. It was. Thereafter, at least a portion of the first lower fraction having an elevated temperature was set to circulate into the heat exchanger 11 to cool the reactants instead of the cooling water, and then the process was set the same as the initial process. At least a portion of the first bottom fraction exhibited an elevated temperature of 28 ° C. after heat exchange with the reactants.
- the second upper fraction can be effectively condensed by exchanging at least a portion of the first lower fraction having a relatively low temperature with the second upper fraction without using a separate refrigerant.
- the reactant can be effectively cooled while at least a portion of the first bottom fraction can have an elevated temperature. It was confirmed that this can reduce the calorie consumption of the reboiler.
- the process was performed by setting the same conditions as in the above embodiment except that the simulation was performed through the process system as shown in FIG. 2.
- the temperature of the first upper fraction and the first lower fraction was 15 ° C., so that the second upper fraction could not be condensed to 10 ° C. or less. Therefore, it is necessary to use a separate high cost refrigerant agent, and thus requires a separate refrigeration facility.
- the process efficiency is low because it consumes a relatively large amount of reboiling heat compared to the embodiment.
- transfer line 30 first top discharge line
- first recovery line 70 second tower bottom discharge line
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Abstract
Description
Claims (27)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US15/321,388 US10371442B2 (en) | 2015-06-09 | 2016-04-28 | Separation method and separation process system for recovering ethylene |
| JP2016575672A JP6429907B2 (ja) | 2015-06-09 | 2016-04-28 | エチレンを回収するための分離方法及び分離工程システム |
| CN201680001963.0A CN106715369B (zh) | 2015-06-09 | 2016-04-28 | 用于回收乙烯的分离方法和分离工艺系统 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150081454A KR101928766B1 (ko) | 2015-06-09 | 2015-06-09 | 에틸렌을 회수하기 위한 분리방법 및 분리공정 시스템 |
| KR10-2015-0081454 | 2015-06-09 |
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| Publication Number | Publication Date |
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| WO2016200053A1 true WO2016200053A1 (ko) | 2016-12-15 |
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| PCT/KR2016/004462 Ceased WO2016200053A1 (ko) | 2015-06-09 | 2016-04-28 | 에틸렌을 회수하기 위한 분리방법 및 분리공정 시스템 |
Country Status (5)
| Country | Link |
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| US (1) | US10371442B2 (ko) |
| JP (1) | JP6429907B2 (ko) |
| KR (1) | KR101928766B1 (ko) |
| CN (1) | CN106715369B (ko) |
| WO (1) | WO2016200053A1 (ko) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021526152A (ja) * | 2018-12-10 | 2021-09-30 | エルジー・ケム・リミテッド | エチレンオリゴマー化反応生成物の分離方法 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107746365A (zh) * | 2017-08-30 | 2018-03-02 | 中国石油化工股份有限公司 | 一种选择性乙烯齐聚生产α‑烯烃的工艺方法及系统 |
| KR102721498B1 (ko) | 2019-07-24 | 2024-10-25 | 에스케이이노베이션 주식회사 | 에틸렌 올리고머화 공정의 미반응 에틸렌 회수 방법 |
| KR102712846B1 (ko) * | 2020-09-07 | 2024-10-02 | 주식회사 엘지화학 | 올리고머 제조방법 |
| KR102829169B1 (ko) * | 2023-10-17 | 2025-07-02 | 한화토탈에너지스 주식회사 | 용매 및 c4 이상의 선형 알파 올레핀들을 포함하는 혼합물의 분리 방법, 및 이를 활용한 에틸렌 올리고머 제조 방법 및 장치 |
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| US3476823A (en) * | 1966-02-03 | 1969-11-04 | Phillips Petroleum Co | Separation of products of ethylene polymerization |
| US3607963A (en) * | 1968-02-13 | 1971-09-21 | Basf Ag | Separation of acetylene and ethylene from cracked gas |
| JPS6169889A (ja) * | 1984-09-14 | 1986-04-10 | Idemitsu Petrochem Co Ltd | エチレンの製造方法 |
| KR0144700B1 (ko) * | 1994-02-04 | 1998-07-15 | 윌리엄 에프. 마쉬 | 에틸렌 회수용 혼합 냉매 사이클 |
| WO2013168098A1 (en) * | 2012-05-09 | 2013-11-14 | Sasol Technology (Proprietary) Limited | Separation of components from a multi-component hydrocarbon stream |
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| US5546764A (en) * | 1995-03-03 | 1996-08-20 | Advanced Extraction Technologies, Inc. | Absorption process for recovering ethylene and hydrogen from refinery and petrochemical plant off-gases |
| US20020182124A1 (en) | 1997-10-14 | 2002-12-05 | William M. Woodard | Olefin production process |
| US6864401B2 (en) * | 2002-07-29 | 2005-03-08 | Exxonmobil Chemical Patents Inc. | Heat-integrated high pressure system for separation of byproducts from an olefin stream |
| US7476775B2 (en) * | 2004-03-03 | 2009-01-13 | Chevron Phillips Chemical Company Lp | Method and system for separating an oligomerization reactor effluent |
| US7858833B2 (en) | 2006-02-03 | 2010-12-28 | Exxonmobil Chemical Patents Inc. | Process for generating linear alpha olefin comonomers |
| MY156622A (en) * | 2007-11-07 | 2016-03-15 | Sasol Tech Pty Ltd | Process for polymerising or oligomerising a hydrocarbon |
| EP2083020A1 (en) * | 2008-01-18 | 2009-07-29 | Total Petrochemicals Research Feluy | Process for monomer recovery from a polymerization process |
| MY161612A (en) * | 2009-10-16 | 2017-04-28 | Sasol Tech (Proprietary) Ltd | Separation of components from a multi-component hydrocarbon stream which includes ethylene |
| SG11201407269TA (en) | 2012-05-09 | 2014-12-30 | Sasol Tech Pty Ltd | A process for oligomerising a hydrocarbon to form at least one co-monomer product |
| ES2524905T3 (es) | 2012-11-28 | 2014-12-15 | Saudi Basic Industries Corporation | Proceso para la oligomerización de etileno |
-
2015
- 2015-06-09 KR KR1020150081454A patent/KR101928766B1/ko active Active
-
2016
- 2016-04-28 JP JP2016575672A patent/JP6429907B2/ja active Active
- 2016-04-28 CN CN201680001963.0A patent/CN106715369B/zh active Active
- 2016-04-28 US US15/321,388 patent/US10371442B2/en active Active
- 2016-04-28 WO PCT/KR2016/004462 patent/WO2016200053A1/ko not_active Ceased
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|---|---|---|---|---|
| US3476823A (en) * | 1966-02-03 | 1969-11-04 | Phillips Petroleum Co | Separation of products of ethylene polymerization |
| US3607963A (en) * | 1968-02-13 | 1971-09-21 | Basf Ag | Separation of acetylene and ethylene from cracked gas |
| JPS6169889A (ja) * | 1984-09-14 | 1986-04-10 | Idemitsu Petrochem Co Ltd | エチレンの製造方法 |
| KR0144700B1 (ko) * | 1994-02-04 | 1998-07-15 | 윌리엄 에프. 마쉬 | 에틸렌 회수용 혼합 냉매 사이클 |
| WO2013168098A1 (en) * | 2012-05-09 | 2013-11-14 | Sasol Technology (Proprietary) Limited | Separation of components from a multi-component hydrocarbon stream |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021526152A (ja) * | 2018-12-10 | 2021-09-30 | エルジー・ケム・リミテッド | エチレンオリゴマー化反応生成物の分離方法 |
| JP7123179B2 (ja) | 2018-12-10 | 2022-08-22 | エルジー・ケム・リミテッド | エチレンオリゴマー化反応生成物の分離方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101928766B1 (ko) | 2018-12-13 |
| US20170198967A1 (en) | 2017-07-13 |
| US10371442B2 (en) | 2019-08-06 |
| JP2018514503A (ja) | 2018-06-07 |
| KR20160144806A (ko) | 2016-12-19 |
| JP6429907B2 (ja) | 2018-11-28 |
| CN106715369A (zh) | 2017-05-24 |
| CN106715369B (zh) | 2020-01-10 |
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