FR2953914A1 - Method for separating mixture of main components of carbon dioxide, involves providing refrigeration part for process by refrigerating circuit, where refrigerating circuit circulates mixed cooling agent to cool exchanger - Google Patents

Method for separating mixture of main components of carbon dioxide, involves providing refrigeration part for process by refrigerating circuit, where refrigerating circuit circulates mixed cooling agent to cool exchanger Download PDF

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Publication number
FR2953914A1
FR2953914A1 FR0958995A FR0958995A FR2953914A1 FR 2953914 A1 FR2953914 A1 FR 2953914A1 FR 0958995 A FR0958995 A FR 0958995A FR 0958995 A FR0958995 A FR 0958995A FR 2953914 A1 FR2953914 A1 FR 2953914A1
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France
Prior art keywords
exchanger
pump
gas
mixture
liquid
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FR0958995A
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French (fr)
Inventor
Alain Briglia
Ludovic Granados
Bernard Saulnier
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Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Priority to FR0958995A priority Critical patent/FR2953914A1/en
Publication of FR2953914A1 publication Critical patent/FR2953914A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02Processes 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
    • F25J3/0228Processes 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
    • F25J3/0266Processes 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 carbon dioxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00Processes or apparatus using separation by rectification
    • F25J2200/02Processes or apparatus using separation by rectification in a single pressure main column system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00Processes characterised by the type or other details of the feed stream
    • F25J2210/70Flue or combustion exhaust gas
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00Processes or apparatus involving steps for the removal of impurities
    • F25J2220/80Separating impurities from carbon dioxide, e.g. H2O or water-soluble contaminants
    • F25J2220/82Separating low boiling, i.e. more volatile components, e.g. He, H2, CO, Air gases, CH4
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/30Compression of the feed stream
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2235/00Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/80Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being carbon dioxide
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2260/00Coupling of processes or apparatus to other units; Integrated schemes
    • F25J2260/80Integration in an installation using carbon dioxide, e.g. for EOR, sequestration, refrigeration etc.
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/04Internal refrigeration with work-producing gas expansion loop
    • F25J2270/06Internal refrigeration with work-producing gas expansion loop with multiple gas expansion loops
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/12External refrigeration with liquid vaporising loop
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00Refrigeration techniques used
    • F25J2270/66Closed external refrigeration cycle with multi component refrigerant [MCR], e.g. mixture of hydrocarbons
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02CCAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00Capture or disposal of greenhouse gases
    • Y02C20/40Capture or disposal of greenhouse gases of CO2

Abstract

The method involves cooling a mixture in a heat exchanger (3) and sending the mixture to a distillation column (4), where the mixture separates to form an overhead gas and bottom liquid. The liquid is pressurized by a pump (5), heated in the exchanger and vaporized in the exchanger or downstream of the exchanger to form a production gas. The overhead gas is heated in the exchanger and released in turbines (6, 7). A refrigeration part for a process is provided by a refrigerating circuit, where the refrigerating circuit circulates a mixed cooling agent to cool the exchanger. The mixed cooling agent is provided with two bodies that are selected from one of hydrocarbons, halogenocarbon, nitrogen, oxygen, argon, carbon dioxide, carbon monoxide or hydrogen. An independent claim is also included for an apparatus for separation of a mixture with main components of carbon dioxide, comprising a heat exchanger.

Description

La présente invention s'applique aux procédés et aux appareils de séparation et/ou purification de dioxyde de carbone. Ces procédés peuvent être, par exemple, dédiés soit à de la séquestration, de l'EOR (Enhanced Oil Recovery), ou toute autre application dédiée à la réduction des émissions de dioxyde de carbone. The present invention is applicable to methods and apparatus for separating and / or purifying carbon dioxide. These methods can be, for example, dedicated either to sequestration, EOR (Enhanced Oil Recovery), or any other application dedicated to the reduction of carbon dioxide emissions.

Les unités de séparation et purification de dioxyde de carbone comprennent généralement les étapes suivantes, dans l'ordre : The separation and purification units of carbon dioxide generally comprise the following steps, in the order:

• prétraitement du gaz à traiter consistant à ôter totalement ou partiellement les impuretés (SON, NON, Hg, H2O, ...) • pretreatment of the gas to be treated consisting of totally or partially removing the impurities (SON, NO, Hg, H2O, ...)

io ^ compression du gaz à traiter compression of the gas to be treated

• séparation et purification du gaz à traiter afin d'en ôter les lourds (NO2, SO2,...), ou les légers (02, N2, Ar, CH4, H2, NO, ...) soit par condensation partielle et/ou par distillation. • separation and purification of the gas to be treated in order to remove the heavy (NO2, SO2, ...), or the light ones (02, N2, Ar, CH4, H2, NO, ...) either by partial condensation and or by distillation.

• vaporisation du CO2 ainsi produit à des différents niveaux de 15 pression afin d'assurer le bilan thermique de l'unité Vaporization of the CO2 thus produced at different pressure levels in order to ensure the heat balance of the unit

• compression des différentes fractions de CO2 ainsi obtenu par un compresseur de produit afin de l'emmener à sa pression finale. Dans certains cas une pompe peut être utilisée pour monter la pression à des valeurs supérieures à 100 bara, en série avec la compression de produit. Compression of the different CO2 fractions thus obtained by a product compressor in order to take it to its final pressure. In some cases a pump can be used to increase the pressure to values above 100 bara, in series with product compression.

20 Un procédé comprenant ces étapes est décrit dans WO-A-07/126972. A process comprising these steps is described in WO-A-07/126972.

La problématique de ce genre de cycle qui doit traiter un fluide impur, et qui utilise pour assurer le bilan thermique de l'unité un corps pur, est la relative inefficacité énergétique lié au diagramme d'échange. The problem of this kind of cycle which must treat an impure fluid, and which uses to ensure the thermal balance of the unit a pure body, is the relative energy inefficiency linked to the exchange diagram.

Selon un objet de l'invention, il est prévu un procédé de séparation d'un According to an object of the invention, there is provided a method for separating a

25 mélange ayant comme composants principaux du dioxyde de carbone et au moins un autre gaz, dans lequel le mélange se refroidit dans un échangeur et est envoyé à une colonne de distillation où il se sépare pour former un gaz de tête et un liquide de cuve, le liquide de cuve est pressurisé par au moins une pompe et réchauffé dans l'échangeur et vaporisé soit dans l'échangeur soit en A mixture having as main components carbon dioxide and at least one other gas, wherein the mixture cools in an exchanger and is sent to a distillation column where it separates to form an overhead gas and a bottom liquid, the tank liquid is pressurized by at least one pump and heated in the exchanger and vaporized either in the exchanger or in

30 aval de l'échangeur pour former un gaz de production, le gaz de tête est réchauffé dans l'échangeur et détendu dans au moins une turbine et une partie des frigories pour le procédé sont fournies par un circuit frigorifique où circule un réfrigérant mixte afin de refroidir l'échangeur. Downstream of the exchanger to form a production gas, the overhead gas is reheated in the exchanger and expanded in at least one turbine and part of the frigories for the process are provided by a refrigerant circuit circulating a mixed refrigerant so to cool the exchanger.

Eventuellement : Eventually :

- le gaz de tête se détend dans au moins deux turbines connectées en série, étant réchauffé entre les turbines ; - The overhead gas relaxes in at least two turbines connected in series, being heated between the turbines;

- le liquide de cuve après avoir été réchauffé dans l'échangeur est 5 pressurisé par une pompe ; the tank liquid after having been reheated in the exchanger is pressurized by a pump;

- chacun des au moins deux corps du réfrigérant mixte est choisi dans les groupes suivants : each of the at least two bodies of the mixed refrigerant is chosen from the following groups:

a) des hydrocarbures a) hydrocarbons

b) des halogeno-carbonés b) Halogen carbonates

io c) azote, oxygène, argon ou (c) nitrogen, oxygen, argon or

d) CO2, CO, H2 d) CO2, CO, H2

- la pompe en aval de l'échangeur pressurise le liquide de cuve à une pression égale ou supérieure à la pression critique de ce liquide. - The pump downstream of the exchanger pressurizes the vessel liquid at a pressure equal to or greater than the critical pressure of the liquid.

Selon un autre objet de l'invention, il est prévu un appareil de séparation According to another object of the invention, there is provided a separation apparatus

15 d'un mélange ayant comme composants principaux du dioxyde de carbone et au moins un autre gaz, comprenant un échangeur, une colonne de distillation, une conduite pour envoyer le mélange se refroidir dans l'échangeur, une conduite pour envoyé le mélange refroidi à la colonne de distillation, une pompe pour pressuriser le liquide de cuve de la colonne en amont de l'échangeur, une A mixture having as main components carbon dioxide and at least one other gas, comprising an exchanger, a distillation column, a pipe for sending the mixture to cool in the exchanger, a pipe for sending the cooled mixture to the distillation column, a pump for pressurizing the bottom liquid of the column upstream of the exchanger, a

20 conduite pour envoyer le liquide pressurisé de la pompe à l'échangeur, une conduite pour envoyer un gaz de tête à se réchauffer dans l'échangeur, une conduite pour envoyer le gaz de tête réchauffé dans au moins une turbine et un circuit frigorifique où circule un réfrigérant mixte afin de refroidir l'échangeur. 20 conduit for sending the pressurized liquid from the pump to the exchanger, a pipe for sending a head gas to heat up in the exchanger, a pipe for sending the heated head gas into at least one turbine and a cooling circuit where circulates a mixed refrigerant to cool the exchanger.

Eventuellement, l'appareil comprend : Optionally, the apparatus comprises:

25 - au moins deux turbines connectées en série et des moyens pour y envoyer le gaz de tête, les turbines étant reliées à l'échangeur ; At least two turbines connected in series and means for sending the overhead gas, the turbines being connected to the exchanger;

- une deuxième pompe et des moyens pour envoyer le liquide de cuve de l'échangeur à la deuxième pompe. a second pump and means for sending the tank liquid from the exchanger to the second pump.

L'invention consiste à utiliser un fluide adapté à la nature du gaz à traiter The invention consists in using a fluid adapted to the nature of the gas to be treated

30 pour obtenir un diagramme d'échange minimisant les inefficacités, d'y associer une succession de turbines de renvoi pour valoriser l'énergie contenu dans les incondensables, et produire ainsi le CO2 sous pression uniquement par pompe (soit en un seul étage jusqu'à la pression finale, soit par succession de pompes dont une pompe froide amenant le CO2 à une pression supérieure à sa pression critique, mais généralement en dessous de 100 bars, et d'une pompe chaude allant jusqu'à sa pression finale. Ainsi, puisque l'on traite un fluide impur, on assure le bilan thermique de l'unité d'au moyen d'un corps impur. 30 to obtain an exchange diagram minimizing inefficiencies, to associate a succession of return turbines to enhance the energy contained in the incondensables, and thus produce CO2 under pressure only by pump (or in a single stage up to at the final pressure, either by succession of pumps including a cold pump bringing the CO2 to a pressure higher than its critical pressure, but generally below 100 bars, and a hot pump up to its final pressure. since an impure fluid is treated, the thermal balance of the unit is ensured by means of an impure body.

Le fluide utilisé ainsi pour assurer le cycle frigorifique est un réfrigérant mixte, qui peut être constitué d'au moins deux corps purs, chacun des corps pouvant peuvent appartenir à famille : The fluid thus used to ensure the refrigerating cycle is a mixed refrigerant, which may consist of at least two pure bodies, each of which may be of family:

• des hydrocarbures • hydrocarbons

• des halogeno-carbonés • halocarbons

• des gaz de l'air (azote, oxygène, argon) ou io le CO2, CO, H2. • air gases (nitrogen, oxygen, argon) or CO2, CO, H2.

L'avantage de ce type de cycle est une amélioration notable de l'efficacité. The advantage of this type of cycle is a noticeable improvement in efficiency.

Pour un cas étudié, un appareil de séparation et purification de dioxyde de carbone dont le bilan frigorifique était assuré par un fluide pur 'en For a case studied, a device for separating and purifying carbon dioxide whose refrigeration balance was ensured by a pure fluid 'in

15 l'occurrence du CO2) avait une énergie spécifique de 183 kW/t de CO2 produit. L'invention a une énergie spécifique de 150 kW/t de CO2 produit, soit 18 0/0 d'amélioration. The occurrence of CO2) had a specific energy of 183 kW / t of CO2 produced. The invention has a specific energy of 150 kW / t CO2 produced, 18% improvement.

Les diagrammes d'échange ci-dessous illustrent la différence en les deux solutions, la figure 2 illustrant l'échange de chaleur dans l'échangeur pour The exchange diagrams below illustrate the difference in the two solutions, with Figure 2 illustrating the heat exchange in the heat exchanger for

20 l'invention et la figure 3 illustrant l'échange de chaleur dans l'échangeur pour l'art antérieur. The invention and FIG. 3 illustrating the heat exchange in the exchanger for the prior art.

L'invention sera décrite en plus de détail en se référant à la figure 1 qui illustre un appareil de séparation selon l'invention. The invention will be described in more detail with reference to Figure 1 which illustrates a separation apparatus according to the invention.

Un débit 10 contenant principalement du dioxyde de carbone, de l'azote A flow 10 containing mainly carbon dioxide, nitrogen

25 et de l'oxygène est comprimé dans un compresseur 1 et refroidi dans un échangeur de chaleur 3. Le débit refroidi est envoyé en cuve d'une colonne de distillation 4. Ici le débit se sépare pour former un gaz de tête enrichi en oxygène et azote et un débit de cuve enrichi en dioxyde de carbone. Le débit de cuve est pressurisé par une pompe 5 à la pression de production et le 25 and oxygen is compressed in a compressor 1 and cooled in a heat exchanger 3. The cooled flow is sent to the bottom of a distillation column 4. Here the flow separates to form an oxygen-enriched overhead gas and nitrogen and a tank flow enriched in carbon dioxide. The tank flow is pressurized by a pump 5 to the production pressure and the

30 liquide se vaporise dans l'échangeur 3 pour former un produit gazeux riche en dioxyde de carbone 13. Liquid vaporizes in the exchanger 3 to form a gaseous product rich in carbon dioxide 13.

Alternativement la pompe 5 peut être une première pompe qui amène le liquide à une pression supérieure ou égale à sa pression critique mais en dessous de 100 bars, une deuxième pompe 5A étant prévue pour amener le liquide à sa pression élevée d'usage. Alternatively the pump 5 may be a first pump which brings the liquid to a pressure greater than or equal to its critical pressure but below 100 bar, a second pump 5A being provided to bring the liquid to its high pressure of use.

Le gaz de tête se réchauffe également dans l'échangeur 3 pour former un débit réchauffé 11 qui se détend dans une turbine 7 qui entraîne un générateur. Le gaz détendu est réchauffé dans l'échangeur 3 pour former un débit détendu réchauffé 12. Le débit 12 est détendu dans une turbine 6 entraînant un générateur jusqu'à la pression atmosphérique. The overhead gas is also heated in the exchanger 3 to form a heated flow 11 which expands in a turbine 7 which drives a generator. The expanded gas is heated in the exchanger 3 to form a heated expanded flow rate 12. The flow 12 is expanded in a turbine 6 driving a generator to atmospheric pressure.

Les frigories pour le procédé sont produites par cette double détente dans les turbines 6,7 mais aussi par un circuit frigorifique dans lequel se détend The frigories for the process are produced by this double expansion in the turbines 6,7 but also by a cooling circuit in which is relaxed

lo un mélange d'au moins deux corps purs constituant un réfrigérant mixte. Le réfrigérant mixte 15 est comprimé dans un compresseur 2, partiellement refroidi dans la partie plus chaude de l'échangeur 3 pour le liquéfier, détendu dans une vanne 8, envoyé au bout froid de l'échangeur 3, réchauffé jusqu'au bout chaud et renvoyé au compresseur 2. 15 lo a mixture of at least two pure substances constituting a mixed refrigerant. The mixed refrigerant 15 is compressed in a compressor 2, partially cooled in the warmer part of the exchanger 3 to liquefy it, expanded in a valve 8, sent to the cold end of the exchanger 3, heated to the hot end and returned to compressor 2. 15

Claims (8)

REVENDICATIONS1. Procédé de séparation d'un mélange ayant comme composants principaux du dioxyde de carbone et au moins un autre gaz, dans lequel le mélange se refroidit dans un échangeur (3) et est envoyé à une colonne de distillation (4) où il se sépare pour former un gaz de tête et un liquide de cuve, le liquide de cuve est pressurisé par au moins une pompe (5) et réchauffé dans l'échangeur et vaporisé soit dans l'échangeur soit en aval de l'échangeur pour former un gaz de production, le gaz de tête est réchauffé dans l'échangeur et io détendu dans au moins une turbine (6,7) et une partie des frigories pour le procédé sont fournies par un circuit frigorifique où circule un réfrigérant mixte afin de refroidir l'échangeur. REVENDICATIONS1. A method of separating a mixture having as main components carbon dioxide and at least one other gas, wherein the mixture cools in an exchanger (3) and is fed to a distillation column (4) where it separates to forming a head gas and a tank liquid, the tank liquid is pressurized by at least one pump (5) and heated in the exchanger and vaporized either in the exchanger or downstream of the exchanger to form a gas. production, the overhead gas is heated in the exchanger and io expanded in at least one turbine (6,7) and part of the frigories for the process are provided by a refrigerant circuit which circulates a mixed refrigerant to cool the exchanger . 2. Procédé selon la revendication 1 dans lequel le gaz de tête se 15 détend dans au moins deux turbines (6,7) connectées en série, étant réchauffé entre les turbines. The method of claim 1 wherein the overhead gas is expanded in at least two serially connected turbines (6,7) being heated between the turbines. 3. Procédé selon la revendication 1 dans lequel le liquide de cuve après avoir été réchauffé dans l'échangeur est pressurisé par une pompe (5A). 20 3. The method of claim 1 wherein the tank liquid after being heated in the exchanger is pressurized by a pump (5A). 20 4. Procédé selon la revendication 1 ou 2 dans lequel chacun des au moins deux corps du réfrigérant mixte est choisi dans les groupes suivants : a) des hydrocarbures b) des halogeno-carbonés 25 c) azote, oxygène, argon ou d) CO2, CO, H2 4. A process according to claim 1 or 2 wherein each of the at least two bodies of the mixed refrigerant is selected from the following groups: a) hydrocarbons b) halogenocarbons c) nitrogen, oxygen, argon or d) CO2, CO, H2 5. Procédé selon l'une des revendications précédentes dans lequel la pompe en aval de l'échangeur pressurise le liquide de cuve à une pression 30 égale ou supérieure à la pression critique de ce liquide. 5. Method according to one of the preceding claims wherein the pump downstream of the exchanger pressurizes the vessel liquid to a pressure equal to or greater than the critical pressure of this liquid. 6. Appareil de séparation d'un mélange ayant comme composants principaux du dioxyde de carbone et au moins un autre gaz, comprenant un échangeur (3), une colonne de distillation (4), une conduite pour envoyer lemélange se refroidir dans l' échangeur, une conduite pour envoyé le mélange refroidi à la colonne de distillation, une pompe pour pressuriser le liquide de cuve de la colonne en amont de l'échangeur, une conduite pour envoyer le liquide pressurisé de la pompe à l'échangeur, une conduite pour envoyer un gaz de tête à se réchauffer dans l'échangeur, une conduite pour envoyer le gaz de tête réchauffé dans au moins une turbine (6,7) et un circuit frigorifique où circule un réfrigérant mixte afin de refroidir l'échangeur. 6. Apparatus for separating a mixture having as main components carbon dioxide and at least one other gas, comprising an exchanger (3), a distillation column (4), a pipe for sending the mixture to cool in the exchanger , a pipe for sending the cooled mixture to the distillation column, a pump for pressurizing the column liquid upstream of the exchanger, a pipe for sending the pressurized liquid from the pump to the exchanger, a pipe for sending a head gas to heat in the exchanger, a pipe for sending the heated head gas into at least one turbine (6, 7) and a cooling circuit where a mixed refrigerant circulates in order to cool the exchanger. 7. Appareil selon la revendication 6 comprenant au moins deux io turbines (6,7) connectées en série, des moyens pour y envoyer le gaz de tête, les turbines étant reliées à l'échangeur. 7. Apparatus according to claim 6 comprising at least two turbines (6,7) connected in series, means for sending the overhead gas, the turbines being connected to the exchanger. 8. Appareil selon la revendication 6 ou 7 comprenant une deuxième pompe (5A) et des moyens pour envoyer le liquide de cuve de l'échangeur à la 15 deuxième pompe. Apparatus according to claim 6 or 7 including a second pump (5A) and means for supplying the vessel liquid from the exchanger to the second pump.
FR0958995A 2009-12-15 2009-12-15 Method for separating mixture of main components of carbon dioxide, involves providing refrigeration part for process by refrigerating circuit, where refrigerating circuit circulates mixed cooling agent to cool exchanger Withdrawn FR2953914A1 (en)

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US6070431A (en) * 1999-02-02 2000-06-06 Praxair Technology, Inc. Distillation system for producing carbon dioxide
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