EP4499258A1 - Procédé d'extraction liquide-liquide des aromatiques avec recyclages de l'extrait - Google Patents
Procédé d'extraction liquide-liquide des aromatiques avec recyclages de l'extraitInfo
- Publication number
- EP4499258A1 EP4499258A1 EP23710365.0A EP23710365A EP4499258A1 EP 4499258 A1 EP4499258 A1 EP 4499258A1 EP 23710365 A EP23710365 A EP 23710365A EP 4499258 A1 EP4499258 A1 EP 4499258A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liquid
- extract
- solvent
- flow
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D11/00—Solvent extraction
- B01D11/04—Solvent extraction of solutions which are liquid
- B01D11/0488—Flow sheets
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/02—Monocyclic hydrocarbons
- C07C15/04—Benzene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/02—Monocyclic hydrocarbons
- C07C15/06—Toluene
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
- C07C15/02—Monocyclic hydrocarbons
- C07C15/067—C8H10 hydrocarbons
- C07C15/08—Xylenes
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/10—Purification; Separation; Use of additives by extraction, i.e. purification or separation of liquid hydrocarbons with the aid of liquids
-
- 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
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/06—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents characterised by the solvent used
- C10G21/12—Organic compounds only
- C10G21/16—Oxygen-containing compounds
-
- 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
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/06—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents characterised by the solvent used
- C10G21/12—Organic compounds only
- C10G21/27—Organic compounds not provided for in a single one of groups C10G21/14 - C10G21/26
-
- 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
- C10G21/00—Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents
- C10G21/28—Recovery of used solvent
-
- 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
- C10G2400/00—Products obtained by processes covered by groups C10G9/00 - C10G69/14
- C10G2400/30—Aromatics
Definitions
- the field of the invention relates to the separation of aromatic compounds, such as benzene, toluene, xylenes (BTX), but also aromatic compounds with 9, 10 or 11 carbon atoms (A9, A10, A11), for petrochemicals coming from a feed comprising a mixture of aromatic and non-aromatic compounds, such as a gasoline feed.
- aromatic compounds such as benzene, toluene, xylenes (BTX)
- aromatic compounds with 9, 10 or 11 carbon atoms A9, A10, A11
- the BTX aromatics extraction process comprises three main operations which are extraction, purification of aromatics and regeneration of the solvent .
- the prior art relates to the aromatics extraction process comprising a liquid-liquid aromatics extraction column, an extractive distillation column and a solvent regeneration column.
- the feed comprising a mixture of aromatics and non-aromatics is sent to the middle of the extraction column, the solvent is sent to the top of the column and the extraction is carried out by contacting the feed and the solvent on the upper section of the extraction column.
- the solvent loaded with aromatics enters a so-called backwash zone where said solvent is contacted with a recycling of light aromatic/non-aromatic mixture coming from the head of the extractive distillation column allowing the partial purification of aromatics to produce an extract.
- the extract is sent to an extractive distillation column for purification using a reboiling rate set so that the aromatics at the bottom of the column are at predetermined non-aromatic content specifications.
- the purified extract is sent to a regeneration column by azeotropic distillation to separate the aromatics from the solvent.
- a first object of the present description is to propose a process for separating a hydrocarbon feedstock for the production of aromatics with improved yield, in particular compatible with injection into an aromatic complex.
- a process for separating aromatic compounds from a charge comprising a mixture of aromatic and non-aromatic compounds comprising the following steps:
- the solvent flow 2 feeds the head of the upper part Z1 of the liquid-liquid extractor T1
- the first fraction feeds said upper part at a point arranged at a position between 0.05* L1 and 0.95x
- the first fraction feeds said upper part below the point of supply of the solvent flow.
- the second fraction feeds said lower part at a point arranged at a position between 0x
- the mass ratio of the first fraction to the second fraction is between 0.01 and 0.99, preferably between 0.1 and 0.95, preferably between 0.15 and 0, 85 and preferably between 0.2 and 0.8.
- the mass ratio of the solvent to the filler is between 0.1 and 50, preferably between 0.5 and 20, preferably between 1 and 9, preferably between 3 and 8.
- the mass ratio of the extract recycling to the charge is between 0.05 and 10, preferably between 0.1 and 8, preferably between 0.2 and 5, preferably between 0 ,3 and 2.
- the filler contains aromatic and non-aromatic compounds comprising from 6 to 11 carbon atoms.
- the liquid-liquid extractor is operated under at least one of the following operating conditions: a pressure between 0.05 MPa and 3 MPa, preferably between 0.1 MPa and 2 MPa, preferably between 0.2 MPa and 1.5 MPa, preferably between 0.3 MPa and 1 MPa; a temperature between 10°C and 150°C, preferably between 15°C and 130°C, preferably between 30°C and 120°C, preferably between 40°C and 110°C.
- the method comprises the following steps:
- the method comprises at least one of the following steps:
- a flow of solvent comprising a solvent chosen from the list consisting of ethylene glycol, diethylene glycol, triethylene glycol, hexamethylphosphoramide, propylene carbonate, ethylene carbonate, sulfolane, 3-methylsulfolane, N-methylacetamide, N,N-dimethylacetamide, butyrolactone, 1-methylpyrrolidone, dimethylsulfoxide, caprolactam, N-methylformamide, pyrrolidine-2-one, furfural, 1 ,1,3,3-tetramethylurea and a mixture thereof;
- solvent chosen from the list consisting of ethylene glycol, diethylene glycol, triethylene glycol, hexamethylphosphoramide, propylene carbonate, ethylene carbonate, sulfolane, 3-methylsulfolane, N-methylacetamide, N,N-dimethylacetamide, butyrolactone, 1-methylpyrrolidone, dimethylsulfoxide, caprolactam, N-
- the method comprises at least one of the following steps:
- liquid-liquid extractor with a flow of solvent chosen from ethylene glycol, diethylene glycol, triethylene glycol, hexamethylphosphoramide, propylene carbonate, ethylene carbonate, sulfolane, 3-methylsulfolane, the N- methylacetamide, N,N-dimethylacetamide, butyrolactone, 1-methylpyrrolidone, dimethylsulfoxide, caprolactam, N-methylformamide, pyrrolidine-2-one, furfural, 1,1,3,3-tetramethylurea and a mixture of these;
- solvent chosen from ethylene glycol, diethylene glycol, triethylene glycol, hexamethylphosphoramide, propylene carbonate, ethylene carbonate, sulfolane, 3-methylsulfolane, the N- methylacetamide, N,N-dimethylacetamide, butyrolactone, 1-methylpyrrolidone, dimethylsulfoxide, caprolactam, N-methylformamide, pyr
- the method comprises at least one of the following steps:
- a device for separating aromatic compounds from a charge comprising a mixture of aromatic and non-aromatic compounds comprising a liquid extractor- liquid adapted to extract aromatics from the feed with a flow of solvent and produce at least one extract concentrated in aromatic compounds relative to the feed, and a raffinate concentrated in non-aromatic compounds relative to the composition of the feed, the liquid-liquid extractor comprising:
- Figure 1 schematically shows a separation process according to the invention.
- Figure 2 schematically shows the operating principle of the liquid-liquid extractor according to the invention.
- Figure 3 schematically shows a separation process according to the prior art.
- the term “comprising” is synonymous with (means the same as) "include” and “contain”, and is inclusive or open and does not exclude other elements not recited. It is understood that the term “understand” includes the exclusive and closed term “consist”.
- the term “based on” is synonymous with “comprises at least 50% by weight of”.
- the terms “essentially” or “substantially” correspond to an approximation of ⁇ 5%, preferably ⁇ 1%, most preferably ⁇ 0.5%.
- an effluent essentially comprising or consisting of compounds A corresponds to an effluent comprising at least 95% by weight of compounds A.
- the term “stream concentrated in a compound” corresponds for example to a stream comprising at least 95% by weight of compounds A. least 80% by weight, preferably at least 90% by weight, most preferably at least 95% by weight of said compound.
- the present invention relates to the separation of aromatic compounds, and in particular BTX, but also aromatic compounds with 9 or 10 or even 11 carbon atoms (A9, A10, A11), for petrochemicals, coming for example from a gasoline feed, such as catalytic cracking gasoline. It relates in particular to a method and an improved device for separating aromatic compounds of 6 to 11 carbon atoms from a feed comprising a mixture of aromatic and non-aromatic compounds, such as a gasoline feed.
- the process according to the invention makes it possible to treat the feedstock 1 with a flow of solvent 2 in a liquid-liquid extractor T1 to produce a concentrated flow (ie enriched) in non-aromatic compounds (raffinate 3 ) and a stream concentrated in aromatic compounds (extract 4), process in which both an upper part Z1 and a lower part Z2 of the liquid-liquid extractor T1 are fed by recycling of extract 5.
- the process/device for separating aromatics according to the invention makes it possible to obtain an improved aromatic recovery yield while guaranteeing high purity, particularly in BTX.
- the raffinate 3 (optionally washed) can be sent to a thermal cracking stage/unit or to a catalytic reforming stage/unit for example in order to increase the production of aromatics.
- the separation process according to the invention makes it possible to treat a feedstock 1 comprising a mixture of aromatic and non-aromatic compounds.
- charge 1 is hydrotreated and/or hydrogenated.
- the feedstock 1 is an optionally hydrotreated and/or hydrogenated gasoline feedstock.
- charge 1 is a C5+ cut, i.e. containing compounds with 5 carbon atoms and more. According to one or more embodiments, charge 1 is a C5-C10 or C5-C11 cut, i.e. containing compounds comprising from 5 to 10 or from 5 to 11 carbon atoms. According to one or more embodiments, charge 1 is a C6-C10 or C6-C11 cut, i.e. containing compounds comprising from 6 to 10 or from 6 to 11 carbon atoms.
- the filler 1 comprises at least 20% by weight, preferably at least 30% by weight, very preferably at least 40% by weight, (e.g. at least 50% by weight) of aromatic compounds of 6 to 11 atoms of carbon, compared to the total weight of the load.
- the filler 1 comprises at least 20% by weight, preferably at least 30% by weight, most preferably at least 40% by weight, (e.g. at least 50% by weight) of mono-aromatic compounds from 6 to 11 carbon atoms, relative to the total weight of the charge.
- the aromatic compounds of charge 1 are mono-aromatic compounds at least 95% by weight, preferably at least 98% by weight, most preferably at least 99% by weight.
- the charge 1 comprises less than 50 ppm by weight of sulfur, preferably less than 10 ppm by weight of sulfur, and very preferably less than 1 ppm by weight of sulfur.
- the charge 1 comprises less than 100 ppm by weight of nitrogen, preferably less than 10 ppm by weight of nitrogen, and very preferably less than 1 ppm by weight of nitrogen.
- the filler 1 comprises less than 0.1% by weight of diolefins, preferably less than 0.05% by weight of diolefins, and very preferably less than 0.01% by weight of diolefins.
- the feedstock 1 comprises less than 0.1% by weight of olefins, preferably less than 0.05% by weight of olefins, and very preferably less than 0.01% by weight of olefins. .
- the filler 1 has a content less than or equal to 5000 ppm by weight, preferably less than or equal to 4500 ppm by weight, and very preferably less than or equal to 3000 ppm by weight, in compounds having a temperature of boiling above 217°C, such as naphthalene.
- charge 1 is free of the following compounds: H2, H2S, light gas such as ethane, propane and butane. According to one embodiment of the invention, the elimination of these compounds in charge 1 is carried out in a fractionation column.
- said charge 1 is at least partly a gasoline cut from a fluidized bed catalytic cracking unit (FCC unit for “Fluid Catalytic Cracking” according to Anglo-Saxon terminology), the gasoline cut preferably having been selectively hydrogenated to transform diolefins into olefins, then fractionated to obtain a C5-C10, C5-C11, C6-C10 or C6-C11 cut, then hydrogenated to saturate the olefin compounds.
- charge 1 comes from the hydrogenation of a pyrolysis gasoline (PyGas according to Anglo-Saxon terminology) mixed with a gasoline cut from an FCC unit.
- the extraction of aromatics in the present invention makes it possible to treat the feedstock 1 in order to recover, on the one hand a concentrated flow of non-aromatic compounds called raffinate 3 and on the other hand a concentrated flow of aromatics called extract 4, relative to to the composition of charge 1.
- the extraction of aromatics is a liquid-liquid extraction of aromatics.
- the liquid-liquid extraction of aromatics comprises the following steps:
- Liquid-liquid extraction allows the separation of aromatics from non-aromatic compounds, such as paraffins and naphthenes, from charge 1.
- the load supply 1 is substantially at an intermediate point in the liquid-liquid extractor T1 (e.g. in the middle of the extractor).
- the intermediate point is a point located between the head and the bottom of the liquid-liquid extractor T1.
- the intermediate point corresponds to a point arranged at a position between 0.1 *L and 0.9xL, more preferably between 0.2xL and 0.8xL, such as between 0.3xL and 0.7xL or between 0.4xL and 0.6xL, L being the length (from) the head (to) the bottom of the liquid-liquid extractor T 1.
- the liquid-liquid extractor T1 can therefore be divided into two parts.
- the upper part Z1 (compared to the intermediate feed point 1) makes it possible to control the yield of aromatics by liquid-liquid extraction (in particular with solvent).
- the lower part Z2 of the liquid-liquid extractor T1 allows a first purification of aromatics, in particular by means of an extract recycling flow 5.
- the solvent flow 2 feeds the upper part Z1 of the liquid-liquid extractor T1. According to one or more embodiments, the flow of solvent 2 supplies the head of the upper part Z1 of the liquid-liquid extractor T 1.
- the solvent comprises a compound chosen from ethylene glycol, diethylene glycol, triethylene glycol, hexamethylphosphoramide, propylene carbonate, ethylene carbonate, sulfolane, 3-methylsulfolane, N-methylacetamide, N,N-dimethylacetamide, butyrolactone, 1-methylpyrrolidone, dimethylsulfoxide, caprolactam, N-methylformamide, pyrrolidine-2-one, furfural, 1,1,3,3-tetramethylurea and a mixture thereof.
- the solvent comprises or consists of sulfolane.
- the solvent consists of at least 80% by weight (eg at least 90% by weight), preferably at least 95% by weight (eg at least 99% by weight), in sulfolane, relative to the total weight of the solvent.
- the solvent further comprises an antisolvent, such as water.
- the anti-solvent comprises or consists of water.
- the solvent comprises between 0.01% by weight and 5% by weight, preferably between 0.1% by weight and 3% by weight (eg between 0.5% by weight and 2% by weight) of anti- solvent, such as water, relative to the total weight of the solvent.
- the solvent comprises, or consists of, sulfolane and water.
- a first fraction 51 for recycling extract 5, for example from the stripping section of extract T3, supplies the upper part Z1 of the liquid-liquid extractor, i.e. above the point d supply of the load 1.
- the first fraction 51 feeds said upper part Z1 preferably below the point of supply of the solvent flow 2 in the upper part Z1 of the liquid-liquid extractor T1.
- the first fraction 51 feeds said upper part Z1 at a point arranged at a position between 0.05x
- _1 corresponds to the position of the head of the liquid-liquid extractor T 1.
- the first fraction 51 feeds said upper part Z1 at a point arranged at a position between 0.05x
- the high position of the first fraction in the liquid-liquid extractor allows a gain in aromatic extraction yields.
- a second fraction 52 for recycling extract 5 feeds the lower part Z2 of the liquid-liquid extractor T 1, i.e. below the feed point of the load 1.
- the second fraction 52 supplies said lower part Z2 at a point arranged at a position between 0x
- the second fraction 52 feeds the bottom of the lower part Z2 of the liquid-liquid extractor T1.
- 0*L2 corresponds to the position of the bottom of the liquid-liquid extractor T 1.
- the mass ratio of the first fraction 51 of the extract recycling 5 supplying the upper part Z1 to the second fraction 52 of the extract recycling 5 supplying the lower part Z2 is between 0.01 and 0.99, preferably between 0.1 and 0.95 and preferably between 0.15 and 0.85 and preferably between 0.2 and 0.8.
- the liquid-liquid extractor T1 makes it possible to separate a raffinate 3 depleted in aromatic compounds relative to charge 1 and an extract 4 concentrated in aromatic compounds relative to charge 1.
- the raffinate 3 leaves the top of the liquid-liquid extractor T1 and is optionally sent to the water washing tower T2.
- the extract 4 leaves the bottom of the liquid-liquid extractor T1 and is sent to the stripping section of the extract T3, preferably with heat exchange with the solvent flow 2 (not shown in Figure 2 for the sake of simplification).
- the liquid-liquid extractor T1 operates adiabatically.
- the mass ratio of solvent 2 to charge 1 is between 0.1 and 50, preferably between 0.5 and 20, preferably between 1 and 9, preferably between 3 and 8, such as 5 ⁇ 1 or 6 ⁇ 1.
- the mass ratio of the recycling of extract 5 to the charge 1 is between 0.05 and 10, preferably between 0.1 and 8, preferably between 0.2 and 5, preferably between 0.3 and 2, such as 0.9 ⁇ 0.2.
- the liquid-liquid extractor T1 is operated at a pressure of between 0.05 MPa and 3 MPa (0.5 and 30 bara), preferably between 0.1 MPa and 2 MPa (1 and 20 bara), preferably between 0.2 MPa and 1.5 MPa (2 and 15 bara), preferably between 0.3 MPa and 1 MPa (3 and 10 bara), such as at 0.65 ⁇ 0, 2 MPa (6.5 +/- 2 bara), for example when the solvent includes sulfolane.
- the extractor is operated at a temperature between 10°C and 150°C, preferably between 15°C and 130°C, preferably between 30°C and 120°C, preferably between 40°C and 110°C, such as 70 ⁇ 2°C, for example when the solvent comprises sulfolane.
- the raffinate 3 is cooled before entering tower T2.
- the raffinate 3 enters the bottom of said tower T2, water 6 is introduced to the top of said tower, the non-aromatic flow 7 (raffinate 3 washed and thus depleted in solvent) exits at the top of said tower, and the washing water 8 (concentrated/enriched in solvent) exits at the bottom of said tower.
- the non-aromatic stream 7 comprises less than 100 ppm by weight, preferably less than 10 ppm by weight, very preferably less than 1 ppm by weight of solvent.
- the washing water 8 is sent to the water stripping section (not shown).
- the non-aromatic stream 7 comprises less than 25% by weight, preferably at least 20% by weight, very preferably less than 17% by weight of aromatic compounds, relative to the total weight of the non-aromatic stream 7.
- the non-aromatic flow 7 can be sent to a thermal cracking stage/unit or to a catalytic reforming stage/unit for example in order to increase the production of aromatics.
- Stripping extract 4 allows the elimination of non-aromatic compounds still present in extract 4.
- Extract 4 loaded with aromatic compounds and solvent is preferably introduced at the top of the stripping section of extract T3 .
- the purity of extract 4 is improved because the residual non-aromatic compounds entrained with the aromatic compounds (less soluble in the solvent) are extracted in the form of gas flow 9 at the top of the extract.
- the gas flow 9 is combined with water, such as the water recovered at the head of the water stripping section (not shown).
- Phase separation in the decanter condenser CD3 allows the recycling of the hydrocarbon phase to the liquid-liquid extractor T1 as extract recycle stream 5 and the aqueous phase 10 is optionally combined with the wash water 8 and sent to the water stripping section (not shown).
- the purified extract 12 from the extract stripping section T3 can be sent to the aromatics recovery tower T6 to separate the aromatics from the solvent (in particular sulfolane) which can be recycled to the liquid-liquid extractor T1 .
- the extract recycling comprises between 50 and 95% by weight, preferably between 60 and 90% by weight (eg 70-90% by weight), of non-aromatic compounds (compounds caused by the aromatic compounds of the extract).
- the extract recycling comprises at least 70% by weight, preferably at least 80% by weight, most preferably at least 90% by weight of compounds with 7 carbon atoms or less.
- the stripping of extract 4 is preferably carried out at low pressure or even under vacuum in order to improve the elimination of non-aromatics from the solvent (in particular sulfolane).
- the stripping section of the T3 extract is operated at a head pressure of between 0.001 MPa and 2 MPa (0.01 and 20 bara), preferably between 0.005 MPa and 1 MPa (0 .05 and 10 bara), preferably between 0.01 MPa and 0.8 MPa (0.1 and 8 bara), preferably between 0.03 MPa and 0.5 MPa (0.3 and 5 bara), such than 0.1 ⁇ 0.05 MPa, for example when the solvent comprises sulfolane.
- the stripping section of the T3 extract is operated at a background temperature of between 50°C and 300°C, preferably between 100°C and 250°C, preferably between 130°C. C and 200°C, preferably between 145°C and 195°C, such as 180 ⁇ 5°C, for example when the solvent comprises sulfolane.
- Stripping the washing water 8 and possibly the aqueous phase 10 makes it possible to eliminate the dissolved hydrocarbons (mainly non-aromatic) from the water coming from the head of the stripping section of the extract T3 and optionally from the water washing tower T2.
- dissolved hydrocarbons mainly non-aromatic
- At least part of the water obtained at the outlet of the water stripping section is sent to the aromatics recovery tower T6, in order to increase the quantity of stripping steam sent at the bottom of the aromatics recovery tower T6.
- the aromatics recovery tower T6 separates the purified extract 12 from the bottom of the extract stripping section T3 into an aromatic flow 13 and the solvent flow 2.
- the aromatics recovery tower T6 operates under vacuum, especially when the solvent includes sulfolane.
- vacuum operation makes it possible to avoid an excessive background temperature, which could lead to decomposition of the solvent.
- water vapor 11, optionally associated with solvent (regenerated) is injected into the bottom of the aromatics recovery tower T6, to improve the extraction of aromatics from the solvent (in particular from the sulfolane).
- the tower head vapors (essentially comprising aromatic compounds and optionally water) can be condensed and optionally decanted in a CD6 decanter condenser.
- part of the condensed overhead aromatic vapors is used for the reflux of the aromatics recovery tower T6, the remainder, constituting the aromatic stream 13, is left from the process and preferably sent to an aromatic complex ( unit for separation and production of aromatic compounds, and in particular BTX).
- Part of the settled water 14 in the settling condenser CD6 can optionally be sent to the water washing tower T2 and the rest is recycled to the water stripping section.
- the flow coming from the bottom of the aromatics recovery tower T6 is composed of regenerated solvent which can be sent to the liquid-liquid extractor T 1, and optionally to the extract stripping section T3 and/or to the section regeneration of the solvent (not shown).
- the aromatics recovery tower T6 is operated at a head pressure of between 0.001 MPa and 2 MPa (0.01 and 20 bara), preferably between 0.005 MPa and 1 MPa (0.05 and 10 bara), preferably between 0.01 MPa and 0.5 MPa (0.1 and 5 bara), preferably between 0.015 MPa and 0.2 MPa (0.15 and 2 bara), such as 0.06 ⁇ 0.04 MPa, for example when the solvent includes sulfolane.
- the aromatics recovery tower T6 is operated at a background temperature of between 50°C and 300°C, preferably between 100°C and 250°C, preferably between 120°C and 200°C, preferably between 130°C and 195°C, such as 170 ⁇ 25°C, for example when the solvent comprises sulfolane.
- the aromatic stream 13 comprises at least 95% by weight, preferably at least 99% by weight, very preferably at least 99.5% by weight, (e.g. at least 99.5% by weight) of aromatic compounds, relative to the total weight of the aromatic flow 13.
- a comparative example of a process for the separation of aromatics from a gasoline cut from catalytic cracking technologies is as follows.
- Table 1 Load 1 feeds the liquid-liquid extractor T1 of the aromatics extraction unit.
- a solvent stream 2 comprising 99.1% by weight of sulfolane is added at the top and an extract recycling stream 5 is added at the bottom of the liquid-liquid extractor T1, as shown in Figure 3.
- a mass ratio [ solvent flow 2]/[load 1] of 8, and a mass ratio [extract recycling flow 5]/[load 1] of 0.5 are engaged at the level of the liquid-liquid extractor T1 which is operated at a pressure between 0.4 MPa and 0.8 MPa and at a temperature of 70°C.
- the raffinate 3 is extracted at the head of the liquid-liquid extractor T1 then sent to the optional water washing tower T2 to remove the little sulfolane solvent which is entrained in the raffinate 3.
- the washing water 8 is composed essentially of water and sulfolane, the non-aromatic stream 7 is composed of raffinate free of solvent.
- optional water stripping and solvent regeneration sections are not shown in Figure 3. Said optional water stripping and solvent regeneration sections make it possible to treat the water flows used in the process of separating and purifying sulfolane.
- the extract 4 of the liquid-liquid extractor T1 feeds the stripping section of the extract T3 which makes it possible to eliminate the non-aromatics entrained with the solvent and the aromatics and create the recycling flow of extract 5 sufficient to return to the liquid-liquid extractor T1.
- the gas flow 9 at the head of the extract stripping section T3 is sent to the decanter condenser CD3 in order to eliminate the aqueous phase 10.
- the T3 extract stripping section includes a stripping column operated at a bottom temperature of 180°C.
- the purified extract 12 at the bottom of the stripping section of the extract T3 containing essentially the solvent and aromatics is sent to the aromatics recovery tower T6, which makes it possible to recover at the bottom the solvent recycled to the liquid extractor.
- liquid T1 as solvent flow 2 and to recover an overhead flow which is sent to the decanter condenser CD6 which makes it possible to draw off decanted water 14 and aromatic flow 13.
- the aromatics recovery tower T6 operates by sending of water vapor 11 at the bottom of the column.
- the T6 aromatics recovery tower is operated at a bottom temperature of 180°C.
- Table 2 presents the mass compositions of the outgoing flows from the reference separation process.
- Table 3 presents the mass distribution of the flows of the reference separation process at the inlet and outlet of the aromatics extraction unit.
- Table 3 presents the extraction yields of aromatic compounds in aromatic stream 13 relative to feed 1.
- An example of a separation process according to the invention for the separation of aromatics coming from a gasoline cut resulting from catalytic cracking technologies is as follows. This example describes the technical effect of the introduction of two fractions of the extract recycling stream 5 corresponding to the first fraction 51 and the second fraction 52 according to Figure 1, in the upper part Z1 and the lower part Z2 of the liquid-liquid extractor T1, respectively.
- Load 1 (identical to the load in example 1) supplies the liquid-liquid extractor T1 of the aromatics extraction unit.
- a stream of solvent 2 comprising 99.1% by weight of sulfolane is added at the top.
- Stream 52 corresponding to 50% by weight of the extract recycling stream 5 is added at the bottom of the liquid-liquid extractor T1 in the lower part Z2, as shown in Figures 1 and 2.
- Stream 51 corresponding to 50% weight of the extract recycling stream 5 is added in the upper part Z1 of the liquid-liquid extractor T1 in position 0.66xL1, 0xL1 corresponding to the top of the upper part Z1.
- a mass ratio [solvent flow 2]/[charge 1] of 8, and a mass ratio [extract recycle flow 5]/[charge 1] of 0.28 are engaged at the liquid-liquid extractor T 1 which is operated at a pressure between 0.4 MPa and 0.8 MPa and at a temperature of 70°C.
- the raffinate 3 is extracted at the top of the liquid-liquid extractor T 1 then sent to the optional water washing tower T2 to remove the little sulfolane solvent which is entrained in the raffinate 3.
- the washing water 8 is composed essentially of water and sulfolane, the non-aromatic stream 7 is composed of raffinate free of solvent.
- optional water stripping and solvent regeneration sections are not shown in Figure 1. Said optional water stripping and solvent regeneration sections make it possible to treat the water flows used in the separation process according to the invention and to purify the sulfolane.
- the extract 4 of the liquid-liquid extractor T1 feeds the stripping section of the extract T3 which makes it possible to eliminate the non-aromatics entrained with the solvent and the aromatics and create the recycling flow of extract 5 sufficient to return to the liquid-liquid extractor T1.
- the gas flow 9 at the head of the extract stripping section T3 is sent to the decanter condenser CD3 in order to eliminate the aqueous phase 10.
- the T3 extract stripping section includes a stripping column operated at a bottom temperature of 180°C.
- the purified extract 12 at the bottom of the stripping section of the extract T3 containing essentially the solvent and aromatics is sent to the aromatics recovery tower T6, which makes it possible to recover at the bottom the solvent recycled to the liquid extractor.
- liquid T1 as solvent flow 2 and to recover an overhead flow which is sent to the decanter condenser CD6 which allows decanted water 14 and aromatic flow 13 to be withdrawn.
- the aromatics recovery tower T6 operates by sending water vapor 11 to the bottom of the column.
- the T6 aromatics recovery tower is operated at a bottom temperature of 180°C.
- Table 5 presents the mass compositions of the outgoing flows from the separation process according to the invention.
- Table 6 presents the mass distribution of the separation process flows at the inlet and outlet of the aromatics extraction unit.
- Table 7 presents the extraction yields of aromatic compounds in aromatic stream 13 compared to load 1.
- Example 2 demonstrates an improvement in the extraction yield of aromatics compared to reference Example 1.
- Load 1 (identical to the load in example 1) feeds the liquid-liquid extractor T1 of the aromatics extraction unit.
- a stream of solvent 2 comprising 99.1% by weight of sulfolane is added at the top.
- Stream 52 corresponding to 50% by weight of the extract recycling stream 5 is added at the bottom of the liquid-liquid extractor T1 in the lower part Z2, as shown in Figures 1 and 2.
- Stream 51 corresponding to 50% weight of the extract recycling stream 5 is added in the upper part Z1 of the liquid-liquid extractor T1 in position 0.33xL1, 0xL1 corresponding to the top of the upper part Z1.
- a mass ratio [solvent flow 2]/[charge 1] of 8, and a mass ratio [extract recycle flow 5]/[charge 1] of 0.27 are engaged at the liquid-liquid extractor T1 which is operated at a pressure between 0.4 MPa and 0.8 MPa and at a temperature of 70°C.
- the raffinate 3 is extracted at the top of the liquid-liquid extractor T 1 then sent to the optional water washing tower T2 to remove the little sulfolane solvent which is entrained in the raffinate 3.
- the washing water 8 is composed essentially of water and sulfolane, the non-aromatic stream 7 is composed of raffinate free of solvent.
- optional water stripping and solvent regeneration sections are not shown in Figure 1. Said optional stripping sections water and regeneration of the solvent make it possible to treat the water flows used in the separation process according to the invention and to purify the sulfolane.
- the extract 4 of the liquid-liquid extractor T1 feeds the stripping section of the extract T3 which makes it possible to eliminate the non-aromatics entrained with the solvent and the aromatics and create the recycling flow of extract 5 sufficient to return to the liquid-liquid extractor T1.
- the gas flow 9 at the head of the extract stripping section T3 is sent to the decanter condenser CD3 in order to eliminate the aqueous phase 10.
- the T3 extract stripping section includes a stripping column operated at a bottom temperature of 180°C.
- the purified extract 12 at the bottom of the stripping section of the extract T3 containing essentially the solvent and aromatics is sent to the aromatics recovery tower T6, which makes it possible to recover at the bottom the solvent recycled to the liquid extractor.
- liquid T1 as solvent flow 2 and to recover an overhead flow which is sent to the decanter condenser CD6 which makes it possible to draw off decanted water 14 and aromatic flow 13.
- the aromatics recovery tower T6 operates by sending of water vapor 11 at the bottom of the column.
- the T6 aromatics recovery tower is operated at a bottom temperature of 180°C.
- Table 8 presents the mass compositions of the outgoing flows from the separation process according to the invention.
- Table 9 presents the mass distribution of the separation process flows between the inlet and outlet of the aromatics extraction unit.
- Table 10 presents the extraction yields of aromatic compounds in aromatic stream 13 compared to load 1.
- Example 3 according to the invention demonstrates an improvement in the extraction yield of total aromatics compared to reference Example 1.
- Example 3 according to the invention also demonstrates an improvement for the recovery of the heaviest aromatics compared to Example 2 according to the invention (see Table 7 vs Table 10).
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2202765A FR3133765A1 (fr) | 2022-03-28 | 2022-03-28 | Procédé d’extraction liquide-liquide des aromatiques avec recycles de l’extrait |
| PCT/EP2023/056439 WO2023186519A1 (fr) | 2022-03-28 | 2023-03-14 | Procédé d'extraction liquide-liquide des aromatiques avec recyclages de l'extrait |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4499258A1 true EP4499258A1 (fr) | 2025-02-05 |
Family
ID=82694194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23710365.0A Pending EP4499258A1 (fr) | 2022-03-28 | 2023-03-14 | Procédé d'extraction liquide-liquide des aromatiques avec recyclages de l'extrait |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4499258A1 (fr) |
| KR (1) | KR20240168973A (fr) |
| CN (1) | CN118973683A (fr) |
| FR (1) | FR3133765A1 (fr) |
| TW (1) | TW202348296A (fr) |
| WO (1) | WO2023186519A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2025172957A1 (fr) * | 2024-02-15 | 2025-08-21 | Reliance Industries Limited | Procédé de récupération de composés aromatiques à partir d'une charge d'hydrocarbures |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2855362A (en) * | 1955-02-21 | 1958-10-07 | Phillips Petroleum Co | Apparatus and process for solvent extraction |
| NL128435C (fr) * | 1961-03-23 | |||
| US4081355A (en) * | 1970-08-12 | 1978-03-28 | Krupp-Koppers Gmbh | Process for recovering highly pure aromatics from a mixture of aromatics and non-aromatics |
| US4869809A (en) * | 1988-05-09 | 1989-09-26 | Uop | Aromatics extraction process control |
| US5191152A (en) * | 1991-02-20 | 1993-03-02 | Uop | Process for the separation of aromatic hydrocarbons with energy redistribution |
| US6565742B1 (en) * | 1997-09-03 | 2003-05-20 | Gtc Technology Inc. | Aromatics separation process and method of retrofitting existing equipment for same |
-
2022
- 2022-03-28 FR FR2202765A patent/FR3133765A1/fr active Pending
-
2023
- 2023-03-14 EP EP23710365.0A patent/EP4499258A1/fr active Pending
- 2023-03-14 CN CN202380031481.XA patent/CN118973683A/zh active Pending
- 2023-03-14 WO PCT/EP2023/056439 patent/WO2023186519A1/fr not_active Ceased
- 2023-03-14 KR KR1020247032526A patent/KR20240168973A/ko active Pending
- 2023-03-25 TW TW112111368A patent/TW202348296A/zh unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR3133765A1 (fr) | 2023-09-29 |
| KR20240168973A (ko) | 2024-12-02 |
| CN118973683A (zh) | 2024-11-15 |
| WO2023186519A1 (fr) | 2023-10-05 |
| TW202348296A (zh) | 2023-12-16 |
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