EP2780098A1 - Procédé et dispositif servant à séparer des gaz acides à partir d'un mélange gazeux - Google Patents

Procédé et dispositif servant à séparer des gaz acides à partir d'un mélange gazeux

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Publication number
EP2780098A1
EP2780098A1 EP12773311.1A EP12773311A EP2780098A1 EP 2780098 A1 EP2780098 A1 EP 2780098A1 EP 12773311 A EP12773311 A EP 12773311A EP 2780098 A1 EP2780098 A1 EP 2780098A1
Authority
EP
European Patent Office
Prior art keywords
water
liquid phase
phase
absorption medium
absorber
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.)
Withdrawn
Application number
EP12773311.1A
Other languages
German (de)
English (en)
Inventor
Jörn Rolker
Matthias Seiler
Ralf Meier
Udo Knippenberg
Rolf Schneider
Muhammad Irfan
Hari Prasad MANGALAPALLY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Evonik Degussa GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Evonik Degussa GmbH filed Critical Evonik Degussa GmbH
Publication of EP2780098A1 publication Critical patent/EP2780098A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1493—Selection of liquid materials for use as absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20415—Tri- or polyamines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20421—Primary amines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20426—Secondary amines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20431—Tertiary amines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20436—Cyclic amines
    • B01D2252/20442—Cyclic amines containing a piperidine-ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B01D2252/20478—Alkanolamines
    • B01D2252/20484—Alkanolamines with one hydroxyl group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/50—Combinations of absorbents
    • B01D2252/504—Mixtures of two or more absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/40—Sorption with wet devices, e.g. scrubbers
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the invention relates to a method and a device for separating an acidic gas, in particular CO2, from a gas mixture.
  • Alkanolamines used as absorption medium used as absorption medium.
  • loaded absorption medium is regenerated by heating, releasing to a lower pressure or stripping, whereby the carbon dioxide is desorbed.
  • the absorption medium can be reused.
  • These methods are described, for example, in Rolker, J .; Arlt, W .; "Separation of carbon dioxide from flue gases by absorption” in Chemie Ingenieurtechnik 2006, 78, pages 416 to 424 and in Kohl, A.L .; Nielsen, R. B., "Gas Purification", 5th ed., Gulf Publishing,
  • An absorption medium comprising water, a hindered amine and an alkali metal carbonate.
  • composition of the absorption medium is chosen so that the absorption medium after desorption in the evaporator of the desorption by the
  • the invention therefore relates to a process for the separation of acidic gases from a gas mixture which comprises absorbing acid gases by contacting the gas mixture with an absorption medium comprising water and at least one amine in an absorber to obtain a loaded absorption medium and a desorption of acidic gases from the loaded absorption medium by stripping with steam in a desorption column, wherein the absorption medium used in at
  • Heating over a demixing temperature in the range of 0 to 130 ° C shows a separation into two liquid phases.
  • the desorption is carried out at a temperature at which in the
  • the invention also relates to an apparatus for the separation of acidic gases from a gas mixture comprising an absorber (1), a desorption column (2) with a mass transfer zone (3), an evaporator (5) and a
  • Phase separation device (6) for the separation of two liquid phases with a feed point (7) and separate
  • Phase separation device (6) arranged.
  • Phase separation device (6) has removal points (8, 9) for a low-water liquid phase and a water-rich liquid phase.
  • the mass transfer zone (3) has a liquid outlet (4), which is connected to the feed point (7) of the phase separation device.
  • the device according to the invention also has
  • the gas mixture can be any gas mixture.
  • Natural gas a methane-containing biogas from a
  • Combustion exhaust gas an exhaust gas from a
  • Calcination reaction such as the burning of lime or the production of cement
  • the gas mixture is a combustion exhaust gas Natural gas or a biogas, more preferably a
  • Combustion exhaust gas for example, from a power plant.
  • the gas mixture contains at least one acidic gas
  • CO2 preferably one or more acidic gases from the series CO2, COS, H 2 S, CH 3 SH and S O 2 , particularly preferably CO 2 .
  • Combustion exhaust gas is preferably previously desulfurized, i. S O2 is extracted from the gas mixture with a desulfurization process known from the prior art,
  • the gas mixture preferably has a content of CO2 in the atmosphere before being brought into contact with the absorption medium
  • Range of 0.1 to 50% by volume more preferably in the range of 1 to 20% by volume, and most preferably in the range of 10 to 20% by volume.
  • the gas mixture can still be added to acidic gases
  • the gas mixture in an absorber is contacted with an absorption medium comprising water and at least one amine which, when heated above a demixing temperature ranging from 0 to 130 ° C, segregates into two liquid phases ,
  • the demixing temperature refers to the unloaded absorption medium without acidic gases.
  • Demixing temperature in the range of 0 to 130 ° C.
  • amines are used which have a solubility of less than 100 g of amine in 1 l of water at 100 ° C., more preferably less than 60 g of amine in 1 liter of water and most preferably less than 10 g of amine in 1 liter of water.
  • the content of alkali metal salts in the absorption medium is preferably below 10 wt .-%, more preferably below 5 wt .-% and in particular below 2 wt .-%.
  • Absorption medium at least one amine of the formula (I)
  • Carbon atoms are those with amino groups or
  • Alkylamino groups may be substituted.
  • the absorption medium comprises at least one amine of the formula (I), for which the radicals R 1 and R 2 are independently hydrogen or alkyl radicals having 1 to 6 carbon atoms, more preferably R 1 is hydrogen and R 2 is an alkyl radical 1 to 6 carbon atoms.
  • R 1 and R 2 are independently hydrogen or alkyl radicals having 1 to 6 carbon atoms, more preferably R 1 is hydrogen and R 2 is an alkyl radical 1 to 6 carbon atoms.
  • R 1 and R 2 are independently hydrogen or alkyl radicals having 1 to 6 carbon atoms, more preferably R 1 is hydrogen and R 2 is an alkyl radical 1 to 6 carbon atoms.
  • R 1 is hydrogen
  • R 2 is an alkyl radical 1 to 6 carbon atoms.
  • Most preferred are the compounds 4- (n-propylamino) -
  • R 1 is hydrogen and R 2 is n-propyl or n-butyl.
  • R 1 is preferably hydrogen and R 2 is an alkyl radical having 1 to 6 carbon atoms, R 2 particularly preferably n-propyl or n-butyl.
  • the weight ratio of the first amine of the formula (I) to the second amine of the formula (I) is preferably in the range from 10: 1 to 1:10, particularly preferably in the range from 3: 1 to 1: 5 and in particular in the range from 1 : 1 to 1: 3.
  • the absorption medium preferably comprises from 25 to 85% by weight of water and from 15 to 75% by weight of amines of the formula (I), based in each case on unloaded absorption medium without acidic gases.
  • an absorption medium containing amines of formula (I) By using an absorption medium containing amines of formula (I), a high capacity for the absorption of CO 2 can be achieved even at low C0 2 partial pressure. In addition, such absorption media are less corrosive, show good stability against
  • the absorption medium may contain, in addition to water and amines of the formula (I), at least one sterically unhindered primary or secondary amine as activator.
  • a sterically unhindered primary amine in the sense of the invention is a primary amine in which the amino group is attached to a
  • Carbon atom is bound to the at least one
  • a sterically unhindered secondary amine in the sense of the invention is a secondary amine in which the amino group is bonded to carbon atoms to which in each case at least two hydrogen atoms are bonded.
  • the content of sterically unhindered primary or secondary amines is preferably 0.1 to 10 wt .-%, particularly preferably 0.5 to 8 wt .-%.
  • Suitable activators are activators known from the prior art, for example ethanolamine, piperazine and 3- (methylamino) -propylamine. Also suitable is 4-amino-2, 2, 6, 6-tetramethylpiperidine. The addition of an activator leads to an acceleration of the absorption of CO 2 from the gas mixture without loss of absorption capacity.
  • the absorption medium may contain, in addition to water and amines, one or more physical solvents
  • the proportion of physical solvents can be up to 50 wt .-%. As a physical
  • Solvents are sulfolane, aliphatic
  • Acid amides such as N-formylmorpholine, N-acetylmorpholine,
  • N-alkylpyrrolidones in particular N-methyl-2-pyrrolidone, or N-alkylpiperidones, and also diethylene glycol,
  • Alkyl ethers in particular diethylene glycol monobutyl ether.
  • the absorption medium does not contain a physical solvent.
  • the absorption medium may additionally have additives, such as corrosion inhibitors, wetting-requiring additives and defoamers.
  • corrosion inhibitors it is possible in the absorption medium to use all substances which are known to the person skilled in the art for the absorption of CO 2 using alkanolamines as suitable corrosion inhibitors, in particular the corrosion inhibitors described in US Pat. No. 4,714,597.
  • the amount of corrosion inhibitors can be significantly lower when using amines of the formula (I) than in a conventional
  • Ethanolamine-containing absorption medium since absorption media containing amines of formula (I), compared to metallic materials significantly less are corrosive than the commonly used ethanolamine-containing absorption media.
  • the wetting-requiring additive used is preferably the nonionic surfactants known from WO 2010/089257 page 11, line 18 to page 13, line 7, zwitterionic surfactants and cationic surfactants.
  • Defoamers which may be used in the absorption medium are all substances which are suitable for the person skilled in the art for the absorption of CO 2 using alkanolamines
  • the gas mixture is in a
  • Absorption column brought into contact with the absorption medium wherein the absorption column is preferably operated in countercurrent, in order to achieve a low residual content of acidic gases in the gas mixture after absorption.
  • the absorption is preferably carried out at a temperature in the range of 0 ° C to 70 ° C, more preferably 20 ° C to 50 ° C, wherein the temperature of the absorption medium when entering the absorber below the
  • Demixing temperature is. Within the absorber, the temperature can also be above the segregation temperature
  • Absorption column is the temperature of the
  • Absorbent medium preferably 30 to 60 ° C when entering the column and 35 to 70 ° C when exiting the column.
  • the absorption is preferably carried out at a pressure of
  • Separation of CO 2 is the initial partial pressure of CO 2 in the gas mixture preferably 0.01 to 4 bar,
  • the absorption at a total pressure of the gas mixture in the range of 0.8 to 1.5 bar, in particular 0.9 to 1.1 bar, performed. This particularly preferred embodiment is advisable in the absorption of CO 2 from the combustion exhaust gas of a power plant without compression of the combustion exhaust gas.
  • the laden absorption medium obtained in the absorber is a
  • the desorption is carried out at a temperature at which separation takes place in the desorption column into a water-rich liquid phase and a water-poor liquid phase.
  • the temperature in the desorption is preferably in the range of 50 ° C to 200 ° C, more preferably in the range of 80 ° C to 150 ° C.
  • the desorption is preferably carried out at a pressure in the range from 10 mbar to 10 bar, particularly preferably in the range from 100 mbar to 5 bar.
  • the water-rich liquid phase resulting from the desorption and the water-poor liquid phase are separated from each other. Part of the water-rich liquid phase is fed to an evaporator in which water vapor is generated, which is fed into the desorption column and stripped with the in the desorption column of acidic gases.
  • the low-water liquid phase and the remaining part of the water-rich liquid phase are called
  • the low-water liquid phase and the remaining part of the water-rich liquid phase are preferably mixed together at a temperature below the demixing temperature before being returned to the absorber.
  • the proportion of water-rich in the evaporator not evaporated liquid phase can optionally be supplied to the desorption column or the absorber.
  • Absorption and desorption can be achieved because in the process, the desorption can be carried out to a low residual content of acidic gases and absorption media can be used with a high proportion by weight of amines with which a high loading is achieved in the absorption.
  • the thermal and oxidative degradation of the amines used for absorption is low in the inventive method, since only a small part of the amines enters the evaporator and is exposed there to the high temperatures at the heat exchange surfaces.
  • the energy requirement of the method according to the invention is compared to
  • Methods using a single-phase absorption medium are significantly lower.
  • the process according to the invention requires no auxiliary substances in addition to water and amine and can be carried out in simple and inexpensive apparatuses.
  • Figure 1 shows a flow diagram of an embodiment of a device according to the invention, in which the
  • Desorption column (2) is arranged.
  • Figure 2 shows a flow diagram of a preferred embodiment of a device according to the invention, in which the
  • Phase separation device (6) within the desorption column (2) below the mass transfer zone (3) is arranged.
  • the device according to the invention for the separation of acidic gases from a gas mixture comprises an absorber (1) in which the gas mixture (20) containing acidic gases is brought into contact with a liquid absorption medium.
  • absorber all known from the prior art devices for the absorption of a gas from a Gas mixture are used in a liquid.
  • a washing column is preferably used, preferably internals to increase the
  • Suitable internals are, for example, packing, e.g. Raschig rings or Pall rings, structured column packs, e.g.
  • Sheet metal packings as well as column bottoms, e.g. Sieve trays.
  • a membrane contactor a radial flow scrubber, a jet scrubber, a venturi scrubber or a rotary scrubber can be used as the absorber.
  • the absorber used is particularly preferably a scrubbing column for countercurrent operation, in which the gas mixture containing acidic gases in a lower region of the
  • Absorption medium is supplied in an upper region of the wash column.
  • the device according to the invention comprises a
  • the desorption column is laden with the acidic gas
  • Absorption medium supplied from the absorber is preferably fed to the desorption column above the mass transfer zone.
  • a desorption column all known from the prior art columns for the desorption of a gas from a liquid can be used.
  • Mass transfer zone (3) is preferably in the form of
  • Column trays random packings or structured packings are preferably used as internals.
  • column trays for example, bubble trays, sieve trays, tunnel trays, valve trays, slotted trays, sieve slotted trays, sieve bubble trays, nozzle trays or
  • the mass transfer zone (3) has a liquid outlet (4), on which liquid is collected, which emerges at the lower end of the mass transfer zone.
  • the device according to the invention comprises an evaporator (5) in which steam is produced, which is fed to the desorption column (2) to supply heat for the desorption of acidic gas from the loaded absorption medium and with the vapor stream acidic gases from the liquid
  • evaporator all known from the prior art evaporators can be used, for example, natural circulation evaporator,
  • the device according to the invention comprises a
  • Phase separation device (6) for the separation of two liquid phases with a feed point (7) and separate
  • Evaporator (5) and the phase separator (6) are arranged separately.
  • the liquid outlet (4) of the mass transfer zone (3) is connected to the feed point (7) of the phase separation device in order to remove from the
  • Phase separation device can all from the state of
  • settling tanks in which a separation of the Phases are done by gravity.
  • separators may be used in which the phases are separated by centrifugal forces.
  • phase separation device (6) is arranged within the desorption column (2) below the mass transfer zone (3)
  • the device according to the invention comprises a
  • Device also comprises a connecting line (11) from the discharge point (9) for low-water liquid phase to the absorber (1), is returned to the low-water liquid phase in the absorber.
  • the device according to the invention additionally comprises a
  • the phase separation device (6) in this embodiment has a level control (18) for a liquid-liquid phase interface in the phase separation device (6), with which the control valve (17) or the controllable pump is driven.
  • the device according to the invention additionally comprises a
  • Removal point (8) for water-rich liquid phase mixes As a mixing device, all known in the art devices for mixing two liquids can be used. As a mixing device are, for example, stirred containers, containers with a liquid circulation via an external circuit or static mixer.
  • Water-rich liquid phase of the mixing device (19) is supplied, heat exchangers (21, 22) arranged, with which let the two phases to a temperature below the demixing temperature of the absorption medium used in the absorber to cool.
  • the heat exchangers (21, 22) are arranged so that they heat exchange between the loaded
  • Desorption column (2) is supplied, and the liquid phases, which are supplied to the mixing device (19) cause.
  • the mixing device By using the mixing device, a uniform flow can be achieved during operation of the device
  • composition of the absorption medium in the absorber ensure that variations in the control of the device do not affect the effectiveness of the absorption.
  • the device according to the invention preferably additionally comprises a condenser (23), which is connected to the head of the desorption column (2) and connected to the
  • FIG. 1 shows an embodiment of the device according to the invention, in which the phase separation device (6) is arranged separately from the desorption column (2) and is designed as a settling tank with an overflow weir.
  • Mass transfer zone (3) used in the connecting line between the liquid outlet (4) and the inlet point (7) of the phase separation device koaleszenzufde internals can be arranged, such as
  • Coalescing filter to achieve a more complete phase separation in the phase separation device.
  • Figure 2 shows a preferred embodiment
  • phase separation device (6) within the desorption column (2) below the mass transfer zone (3) is arranged.
  • the phase separation device (6) is characterized by a
  • Overflow weir (13) formed in the column sump (12), which separates the column sump in a first zone (14) and a second zone (15), and by a feed point (7) to the first zone (14), wherein the feed point with the
  • Liquid outlet (4) of the mass transfer zone (3) is connected.
  • the liquid drain (4) is preferably formed as a collection tray for liquid with a liquid drain above the first zone.
  • the feed point to the first zone (14) may be above the first zone (14) be arranged as shown in Figure 2, or within the first zone (14) below the upper edge of the overflow weir (13) to be arranged.
  • a removal point (8) is arranged, which via a connecting line (10) connected to the evaporator (5) is and arranged in the second zone (15) has a removal point (9), which has a
  • the device according to the invention may comprise additional pumps, measuring devices, control valves, shut-off valves and buffer containers which are not shown in FIGS. 1 and 2 and which the person skilled in the art has been aware of
  • the device according to the invention has a simple structure and can be carried out with commercially available apparatuses. It enables stable operation without
  • the absorption medium was placed in a pressure-resistant glass vessel and saturated at 20 ° C and atmospheric pressure by the addition of dry ice with CO 2 .
  • the glass jar was then capped and the CO 2 -loaded absorption medium was slowly heated in an oil bath until separation into two liquid phases, that of turbidity of the previously clear mixture
  • Butyl TAD 4- (n-butylamino) -2,2,6,6-tetramethylpiperidine
  • DM-TAD 4- (dimethylamino) -2,2,6,6-tetramethylpiperidine
  • TAT 4- (3-dimethylamino-propylamino) -
  • EAE-TAD 4- (2-ethylamino-ethylamino) -
  • Evaporator is supplied, containing only small amounts of amine.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un procédé servant à séparer des gaz acides à partir d'un mélange gazeux. Ce mélange gazeux est amené en contact avec un milieu absorbant contenant de l'eau et au moins une amine et présentant une température de séparation comprise dans la plage allant de 0 à 130 °C. A partir du milieu absorbant chargé, les gaz acides sont désorbés dans une colonne de désorption par entraînement à la vapeur d'eau, la désorption s'effectuant à une température à laquelle il se produit dans la colonne de désorption une séparation en une phase liquide riche en eau et en une phase liquide pauvre en eau. La phase liquide riche en eau obtenue et la phase liquide pauvre en eau sont séparées, la phase liquide riche en eau est introduite dans un évaporateur dans lequel on produit de la vapeur d'eau avec laquelle on rectifie les gaz acides dans la colonne de désorption. La phase liquide pauvre en eau et la phase liquide riche en eau sont réintroduites en tant que milieu absorbant dans l'absorbeur. Un dispositif pour ce procédé comprend un absorbeur (1), une colonne de désorption (2) ayant une zone d'échange de substances (3) comportant une évacuation des liquides (4), un évaporateur (5) et un dispositif de séparation de phases (6) ayant un point d'alimentation (7) et des points de prélèvement (8, 9) pour les phases liquides, l'évaporateur (5) étant agencé à l'écart du dispositif de séparation de phases (6), l'évacuation des liquides (4) de la zone d'échange de substances (3) étant reliée au point d'alimentation (7) du dispositif de séparation de phases et le dispositif comportant des conduits de raccordement (10, 11) partant du point de prélèvement (8) pour la phase liquide riche en eau jusqu'à l'évaporateur (5) et du point de prélèvement (9) pour la phase liquide pauvre en eau jusqu'à l'absorbeur (1).
EP12773311.1A 2011-11-14 2012-10-15 Procédé et dispositif servant à séparer des gaz acides à partir d'un mélange gazeux Withdrawn EP2780098A1 (fr)

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PCT/EP2012/070380 WO2013072147A1 (fr) 2011-11-14 2012-10-15 Procédé et dispositif servant à séparer des gaz acides à partir d'un mélange gazeux

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AU (1) AU2012339061B2 (fr)
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CA (1) CA2855855A1 (fr)
CO (1) CO6960534A2 (fr)
EA (1) EA025928B1 (fr)
MX (1) MX2014005746A (fr)
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AU2012339061A1 (en) 2014-03-13
BR112014008497A2 (pt) 2017-04-11
TN2014000090A1 (en) 2015-07-01
EA201400577A1 (ru) 2014-10-30
EA025928B1 (ru) 2017-02-28
US9221007B2 (en) 2015-12-29
MX2014005746A (es) 2014-07-09
CO6960534A2 (es) 2014-05-30
US20160045857A1 (en) 2016-02-18
US20130118350A1 (en) 2013-05-16
AU2012339061B2 (en) 2016-10-13
CA2855855A1 (fr) 2013-05-23

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