415 results about "Co2 absorption" patented technology

The present application relates to hydrogen production technology field, especially to a kind of methanol hydrogen production method, comprising the following steps: S10: methanol water is heated and vaporized to obtain methanol water vapor;S20: methanol reforming reaction obtains hydrogen mixture gas;S30: after cooling treatment to hydrogen mixture gas, through water washing tower absorption unreacted methanol water, then, adjust the relative humidity and temperature of hydrogen mixture gas;S40: hydrogen mixture gas is input into carbon dioxide absorption tower to remove carbon dioxide;S50: after removing carbon dioxide, product hydrogen is obtained and input hydrogen tank storage to supply user end.The above-mentioned methanol hydrogen production method, by methanol water vapor reforming hydrogen treatment, obtains hydrogen mixture gas.Again, hydrogen mixture gas is purified to obtain product hydrogen with very low carbon monoxide content, with raw material easy to transport, the hydrogen purity of output is high, equipment construction cost is low, and energy consumption is low and the like advantages, reach the purpose of expanding hydrogen application range.

The invention relates to a long-term stable carbon dioxide absorbent and a preparation method and application thereof, preparation raw materials of the carbon dioxide absorbent comprise a quaternary ammonium salt hydrogen bond acceptor, an amine compound, an alcohol hydrogen bond donor and a reinforcing agent, and the reinforcing agent comprises sorbitol, boric acid or nano silicon dioxide. The carbon dioxide absorbent disclosed by the invention not only has excellent absorption and desorption effects, but also is creatively added with the reinforcing agent. By adding the reinforcing agent, the long-term operation stability of the absorbent under an oxygen-containing condition can be remarkably improved on the premise that the original excellent CO2 absorption and desorption performance is not influenced basically, and oxidative degradation of amine components is effectively inhibited. The composition is simple to prepare and controllable in cost, and is suitable for efficiently and stably capturing CO2 from gas mixtures such as industrial flue gas.

The invention relates to a CO2 absorbent with high cycle capacity and high cycle stability and application of the CO2 absorbent, and belongs to the technical field of atmospheric CO2 pollution treatment in the environmental protection industry. The CO2 absorbent is a polyamide-amine dendritic polymer (represented by PAMAM-2 (2 + G) NH2, G is the algebra, and 2 (2 + G) is the number of terminal amino groups), wherein primary amino is used as a terminal group, alkylene diamine is used as a core, and the algebra G is 1-5. The polyamidoamine dendritic polymer provided by the invention has the advantages of high-density terminal amino groups, high CO2 absorption capacity, large circulation capacity and high circulation absorption stability.

The invention discloses a bimetallic-based catalyst for promoting CO2 absorption-desorption cycle of an alcohol amine solution as well as a preparation method and application of the bimetallic-based catalyst, an MCM-41 molecular sieve with a high specific surface area and an ordered mesoporous structure is taken as a carrier, Zr (SO4) 2 and copper acetylacetonate are loaded as bimetallic active components, the catalyst has a proper acid site and good surface acidity, and the catalyst can be applied to CO2 absorption-desorption cycle of an alcohol amine solution. The decomposition of bicarbonate ions is accelerated, the fracture bond energy of C-N is reduced, the carbon dioxide desorption performance of MEA and a water-poor system is enhanced, and the energy consumption is reduced. Compared with the prior art, the molecular sieve catalyst is synthesized by adopting a one-step hydrothermal method, and the process is simple; the catalyst is not only suitable for a traditional MEA aqueous solution, but also effective in a novel water-poor amine liquid system, and provides an energy-saving solution for different carbon capture processes. After the catalyst is subjected to five times of absorption-desorption cycles, the catalytic activity of the catalyst can still be kept at 90% or above of an initial value, and good cycle stability is shown.

The invention discloses a low-viscosity ternary eutectic solvent as well as a preparation method and application thereof, and belongs to the technical field of CO2 absorbents. The low-viscosity ternary eutectic solvent is composed of polyamine hydrochloride, steric hindrance amine and organic alcohol, the polyamine hydrochloride has multiple active amino groups and is used for guaranteeing the high CO2 absorption rate and absorption load of the ternary eutectic solvent, the steric hindrance amine can inhibit formation of a hydrogen bond network due to the unique steric hindrance structure, and the high CO2 absorption rate and absorption load of the ternary eutectic solvent are improved. The organic alcohol can be used as a viscosity regulating agent, active hydroxyl of the organic alcohol can promote proton transfer in a CO2 desorption reaction, and the CO2 desorption efficiency is enhanced. The ternary eutectic solvent provided by the invention can still maintain a low-viscosity homogeneous liquid state after absorbing CO2, can effectively reduce the reduction of mass transfer efficiency caused by high viscosity, influence on contact with a target compound, heat transfer efficiency and the like, and solves the ubiquitous problems of overhigh viscosity and insufficient regeneration efficiency of the existing DESs system.

The invention provides an intelligent design method of organic amine for carbon dioxide absorption based on machine learning based on a Kolmogorov-Arnold Networks (KAN) machine learning model and a chemical interpretation descriptor (such as MATSd, RPCG, BCUTdv-11 and the like). By screening the chemical descriptors of amine molecules and analyzing the correlation between the chemical descriptors and the upper and lower limits of a cycle period, possible combination speculation of potential organic amine chemical descriptors is finally realized. Compared with a traditional experiment-driven trial and error method, high-throughput prediction of molecular properties is realized through a machine learning technology, the descriptor speculation efficiency is greatly improved, and meanwhile, the research and development cost is reduced. By utilizing a machine learning model, chemical descriptor combinations of other potential amine molecules can be speculated, and theoretical support and technical reserve are provided for innovative development of a carbon capture technology.

The invention belongs to the technical field of carbon dioxide capture and separation, and particularly relates to a two-phase absorbent for capturing carbon dioxide as well as a preparation method and application thereof, and the two-phase absorbent comprises a polyamino compound, a compound containing amino and ether bonds, a phase splitting agent and water; wherein the compound containing the amido and the ether bond comprises a monoamine compound containing the ether bond and a polyamine compound containing the ether bond; the mass ratio of the monoamine ether bond-containing compound to the polyamine ether bond-containing compound is (0.1-5): 1. Compared with a traditional organic amine absorbent, the two-phase absorbent provided by the invention has the characteristic of high CO2 absorption capacity, and meanwhile, due to the fact that the two-phase absorbent can greatly reduce the volume of a regeneration solution, the regeneration energy consumption can be greatly reduced.

The invention relates to the technical field of removal of carbon dioxide in oil gas, in particular to a preparation method of carbon dioxide PAMAM grafted ionic liquid for oil gas purification. Comprising the following steps: 1) activating carboxyl: dissolving 1-butyl-3-methylimidazole carboxylic acid in a solvent, adding dicyclohexylcarbodiimide and 4-dimethylaminopyridine, and stirring at room temperature to generate active ester; 2) grafting PAMAM: adding PAMAM dendrimer into the solution, and reacting under the protection of nitrogen; and 3) purification: removing the dicyclohexylurea precipitate through centrifugation, and dialyzing the filtrate to remove the unreacted ionic liquid and small molecule byproducts to obtain the PAMAM grafted ionic liquid. The stability and durability of the absorbent are remarkably improved, the CO2 absorption efficiency is improved, the energy consumption of the absorbent per unit mass is reduced, and the preparation method is simple and controllable, mild in reaction condition and easy for large-scale production.

The invention discloses a Pickering IL emulsion microreactor constructed on the basis of temperature-sensitive double-enzyme Janus spheres and application of the Pickering IL emulsion microreactor to enhanced catalysis of conversion of CO2 into formic acid. A Janus emulsion template method is combined with a photocuring technology to synthesize a nano-scale dual-functional temperature-sensitive Janus sphere, one half of the nano-scale dual-functional temperature-sensitive Janus sphere is a hydrophilic hydrocarbon polymer, the other half of the nano-scale dual-functional temperature-sensitive Janus sphere is a hydrophobic fluorocarbon polymer, and rapid inversion of a Pickering emulsion can be realized by utilizing temperature sensitivity. The method comprises the following steps: preparing a Janus particle hydrophilic / hydrophobic hemisphere, selectively immobilizing formate dehydrogenase FDH and carbonic anhydrase CA on the Janus particle hydrophilic / hydrophobic hemisphere to obtain a temperature-sensitive FDH-Janus-CA composite sphere, introducing a fluorine-functionalized ionic liquid to regulate and control the internal microenvironment of a microreactor, and constructing a Pickering IL emulsion microreactor. The CO2 absorption capacity is increased by 47 times compared with that of a pure water system, the formic acid yield reaches 27.5 mM and is higher than the maximum value 22.8 mM of current enzyme electrocatalysis, the storage and catalysis stability is good, and an efficient and sustainable scheme is provided for CO2 recycling.

This invention provides an absorption tower, comprising: an inlet section with a flue gas inlet; an absorption section above the inlet section, containing an absorbent bed and a reflux port; a scrubbing section above the absorption section, connected to the absorption section, containing a spray assembly and a liquid outlet; an outlet section with a flue gas outlet communicating with the scrubbing section at its upper end; and a recovery assembly including a connecting pipe, the first end of which is connected to the liquid outlet, and the second end of which is connected to the reflux port, to discharge liquid from the scrubbing section into the absorption section. The technical solution provided in this application solves the problems in related technologies where, when absorbent is introduced into a carbon dioxide absorption tower, some absorbent is released into the air with the flue gas, causing air pollution and absorbent loss.

The application belongs to the technical field of gas separation and carbon dioxide capture absorbent, and discloses a guanidinium-based deep eutectic solvent absorbent suitable for a wet environment, a preparation method thereof and CO2 capture application. The deep eutectic solvent takes 1-acetyl guanidine AG as a hydrogen bond acceptor and an alcohol amine compound as a hydrogen bond donor, and is formed into a uniform and stable liquid through heating and stirring. When the molar ratio of AG to MEA is 1:5.5 under the condition of 333.15 K and 1.0 bar, the system has a high CO2 absorption capacity, reaching 0.2278 g / g. When the water content is 10 wt%, the CO2 absorption capacity can be increased to 0.2456 g / g. The absorption rate is fast, and the absorption equilibrium can be approached in 20 min. The DESs have the characteristics of high CO2 absorption capacity, fast absorption rate, simple preparation method and good adaptability to a wet environment.

This technology provides a flow path that allows the electrolyte to be circulated according to its state. [Solution] The carbon dioxide concentrator comprises an absorption unit that absorbs carbon dioxide into an electrolyte, an electrochemical cell that generates carbon dioxide from the electrolyte, and a passage for flowing the electrolyte. The electrochemical cell comprises an anode, a cathode, an electrolyte membrane provided between the anode and the cathode, a first liquid chamber provided between the anode and the electrolyte membrane and supplied with the electrolyte, and a second liquid chamber provided between the electrolyte membrane and the cathode and supplied with the electrolyte. The passage includes a first passage that sends the electrolyte discharged from the second liquid chamber to the absorption unit and a second passage that returns it to the second liquid chamber, and the flow path of the electrolyte can be switched between the first passage and the second passage.

The invention discloses a fertilization method and system for improving CO2 absorption efficiency of greenhouse plants based on an SPAC system. The method comprises the following steps: acquiring moisture information and environment information of the greenhouse plants through a biological environment information acquisition module deployed in a greenhouse; according to the obtained moisture information and environment information, the current leaf water potential and the saturation vapor pressure difference are calculated; calculating the stomatal conductance of the plant by combining the soil water potential and the atmospheric pressure according to the calculated current leaf water potential and saturation vapor pressure difference; and regulating and controlling water and CO2 fertilization of the greenhouse plants according to the stomatal conductance of the plants. By means of the method, under the condition that the evaporation intensity is too high, plant water stress can be weakened, stomatal opening is promoted, stomatal conductivity and mesophyll conductivity are improved, CO2 absorption and utilization are promoted, the photosynthesis efficiency of greenhouse fruits and vegetables can be effectively improved, and plant growth and yield formation are promoted.

This document discloses a method for producing shape-defined aerogels, comprising the steps of providing a viscous liquid containing CO2-absorbing particles, transferring the viscous liquid into a metering device, feeding the viscous liquid into liquid nitrogen via the metering device to produce aerogels, and freeze-drying the aerogels to produce shape-defined aerogels. Furthermore, shape-defined aerogels, the use of a shape-defined aerogel, and a method for CO2 sorption are described.

The application provides a ship exhaust carbon dioxide capture system and method, which comprises the following: an exhaust pretreatment unit, which comprises at least an engine, an exhaust pretreatment tower and a fan; the exhaust port of the engine is connected to the air inlet of the exhaust pretreatment tower; the air outlet of the exhaust pretreatment tower is connected to a CO2 absorption unit through the fan; the liquid outlet of the exhaust pretreatment tower is connected to a solution dilution unit; the CO2 absorption unit comprises at least a first absorption tower and a first dissolving tank; the first absorption tower is connected to the first dissolving tank; the first dissolving tank is provided with a first stirrer; the first dissolving tank is further connected to a first calcium carbonate filling unit; the solution dilution unit comprises at least a ballast water tank and a solution dilution tank; the ballast water tank is connected to the solution dilution tank; and the first dissolving tank is connected to the solution dilution tank. The system can absorb CO2 in the exhaust and convert it into calcium bicarbonate solution, avoids the separation, compression and transportation of CO2, and has the advantages of compact structure, low operation energy consumption and no secondary pollution.

The present application relates to the technical field of CO2 capture, and discloses a composition for CO2 capture, and a method for CO2 absorption and desorption, wherein the composition comprises an organic amine and a thermal degradation inhibitor; the thermal degradation inhibitor is a non-ionic organic compound, and the non-ionic organic compound comprises at least one five-membered aromatic nitrogen heterocycle containing a pyrrole nitrogen. When the composition is used in CO2 absorption and desorption, the thermal degradation rate of the organic amine is greatly reduced, and the stability is good.

The application discloses a preparation method of a ferroferric oxide-sepiolite (Fe2O3-SEP) catalyst for CO2 amine solution desorption, wherein the catalyst is obtained by loading metal oxides on sepiolite through an impregnation method. The method comprises the following steps: firstly, magnetically stirring and impregnating a metal nitrate solution and sepiolite in a water bath, then performing suction filtration, drying, grinding and calcination to obtain the supported Fe2O3-SEP catalyst. The obtained catalyst is used for desorption of saturated amine-rich solution, the amine-lean solution after desorption is cooled, the CO2 loading amount of the amine-lean solution is titrated, CO2 is introduced again for absorption, and the amine-lean solution is recycled for 4-5 times. Compared with existing catalysts, the catalyst has the advantages of wide raw material distribution, low price, simple preparation process, no other by-products, stable catalytic performance and no influence on CO2 absorption performance of the amine solution.

The invention belongs to the technical field of carbon dioxide capture, and discloses a mixed solvent for carbon dioxide absorption and a carbon dioxide absorption method. The invention relates to a mixed solvent for carbon dioxide absorption. The mixed solvent is prepared from 3-methylaminopropylamine, isobutylamine, pentamethyldiethylenetriamine and water, wherein the concentration of the 3-methylaminopropylamine is 1.5 mol / L, the concentration of the isobutylamine is 0.5 mol / L, and the concentration of the pentamethyldiethylenetriamine is 3 mol / L. According to the invention, MAPA with high activity of primary amine and regulation and control functions of secondary amine, IBA with a unique space structure and a high-efficiency phase-splitting agent PMDETA are compounded in a pure water phase according to a specific proportion, so that an unexpected synergistic effect is generated. The technical prejudice that the capacity must be sacrificed when the viscosity is reduced is successfully broken through. The data of the embodiment shows that compared with the closest 2M3P system, the preferable solvent has the advantages that the rich phase viscosity is greatly reduced by 60%, the absorption capacity of 4.07 mol / kg is still kept, and the desorption efficiency is remarkably improved.

This invention provides a self-heating carbon dioxide capture system. The system diverts the hot lean liquor output from the desorption tower via a second distributor. Waste heat is recovered from the diverted hot lean liquor (at high temperatures) and the lean liquor (at medium temperatures) cooled by a lean-rich liquor heat exchanger via a second and a first waste heat recovery heat pump, respectively. The recovered waste heat is then used to heat the medium-lean liquor at the bottom of the desorption tower for carbon dioxide desorption. Furthermore, the system utilizes a third waste heat recovery heat pump to efficiently enhance the heat of reaction during CO2 absorption and use it for CO2 desorption. In addition, the system uses a first coupling heat exchanger to allow the heat recovered from the medium-temperature lean liquor to be reused in the working fluid after carbon dioxide desorption for further heat exchange with a diverted cold-rich liquor stream to preheat the cold-rich liquor, thus achieving coupled utilization of energy within the carbon dioxide capture system.

The invention discloses a low-partial-pressure CO2 catalytic absorption method and application, and belongs to the technical field of gas separation. The low-partial-pressure CO2 catalytic absorption method comprises the following steps: S1, providing a nitrogen-doped activated carbon catalyst; the nitrogen-doped activated carbon catalyst is prepared by taking activated carbon as a carbon source and modifying the activated carbon through a nitrogen-containing reagent; s2, providing an organic amine solvent; and S3, under the action of the nitrogen-doped activated carbon catalyst provided in the S1, enabling flue gas to react with the organic amine solvent provided in the S2. Compared with the existing CO2 absorption method, the method provided by the invention has the advantages that the CO2 absorption rate, the CO2 absorption capacity and the CO2 capture efficiency can be remarkably improved, so that low-cost CO2 capture is realized.

This invention discloses a selective CO2 capture device for industrial flue gas, relating to the field of industrial flue gas treatment and gas separation technology. The invention includes a distribution assembly, which comprises a distribution cylinder body. A rotating assembly is mounted on the inner wall of the distribution cylinder body. The rotating assembly includes a rotating support, and a gas storage assembly is mounted on the inner wall of the rotating support. A top cover is mounted on the top surface of the distribution cylinder body, and a driving arc block is mounted on the bottom surface of the top cover. A CO2 absorption assembly and a nitrogen absorption assembly are mounted on the outer wall of the distribution cylinder body. This invention uses the rotating assembly to drive the gas storage assembly to rotate, causing the driving arc block and the abutting arc block to periodically contact each other, thereby realizing a cyclic process of air intake to exhaust within the corrugated sleeve. The CO2 contained in the industrial flue gas is selectively absorbed by a solid amine adsorbent in the first reaction shell, and the nitrogen is selectively adsorbed by a carbon molecular sieve adsorbent in the second reaction shell, effectively achieving directional separation of gas components and improving gas purification efficiency and selective capture capability.

The present disclosure relates to the technical field of carbon dioxide gas separation. Disclosed are a carbon dioxide absorption liquid, as well as a method and a device for capturing carbon dioxide from a fuel gas. The carbon dioxide absorption liquid comprises 100 parts by weight of a solvent, 10-55 parts by weight of an amino acid, 20-65 parts by weight of an organic amine, 5-15 parts by weight of an activator, and 2-12 parts by weight of an accelerator. According to the carbon dioxide absorption liquid provided in the present disclosure, by means of the synergistic effect of the amino acid, the organic amine, the activator and the accelerator, not only can the absorption capacity of the carbon dioxide absorption liquid for carbon dioxide be improved, but the regeneration energy consumption of the carbon dioxide absorption liquid can also be reduced, such that high-purity carbon dioxide is obtained.

To provide a technology for estimating carbon dioxide absorption by plants.SOLUTION: A method for estimating the amount of carbon dioxide absorbed by plants grown within a facility includes: a first calculation step of calculating the amount of plant growth when carbon dioxide is supplied into the facility so that the carbon dioxide concentration within the facility matches the carbon dioxide concentration in the atmosphere; a second calculation step of calculating a first total amount of carbon dioxide absorbed by the plants based on the amount of growth; and a first estimation step of estimating the first total amount of carbon dioxide absorbed by the plants from the atmosphere as the value obtained by subtracting the first amount of carbon dioxide supplied from the first total amount of carbon dioxide absorbed.SELECTED DRAWING: Figure 1

[Problem] To provide a manufacturing method for a carbon dioxide absorbed sludge fine powder that has high fluidity and serves as a binder of low carbon materials. [Solution] In the present invention, water is added to residual concrete or return concrete to obtain a slurry; sand and gravel are separated and removed to obtain sludge water; a fine sand component is separated and removed from the sludge water by a wet cyclone to obtain concentrated sludge water; and the concentrated sludge water is dewatered to obtain a sludge cake. The sludge cake is placed in a rotating drum into which heated air and high-concentration carbon dioxide are supplied, and the sludge cake is pulverized and dried while being caused to absorb the carbon dioxide to obtain a carbon dioxide absorbed sludge fine powder. Alternatively, the sludge cake is placed in the rotating drum, heated air is supplied, and the sludge cake is pulverized and dried to obtain a sludge fine powder. This sludge fine powder is exposed to high-concentration carbon dioxide to obtain a carbon dioxide absorbed sludge fine powder.

Conventionally, CO2 absorbents such as isophorone diamine are used, and the CO2 absorption process at low temperatures and the CO2 extraction process at high temperatures are carried out in separate tanks. However, once the CO2 absorbent such as isophorone diamine absorbs CO2 and solidifies (changes into carbamic acid), it becomes difficult to move it to the other tank, which presents a problem. [Solution] Even when CO2 absorbents such as isophorone diamine absorb CO2 and solidify (change into carbamic acid), the system does not require movement. By creating a (medium to high) vacuum inside the tank, the amount of air inside the tank is reduced, and the concentration of CO2 extracted from the carbamic acid increases accordingly.

The invention relates to the field of manufacturing of medical supplies, in particular to a platelet storage bag which comprises a bag body with the periphery fixedly connected to form a space in the center side for storing platelets, and a connecting pipe communicated with the interior of the bag body for circulation of the platelets. The bag body comprises two layers of isolating membranes which are in contact with blood platelets and only allow gas to pass through, oxygen generating layers and carbon dioxide absorbing layers which are compounded on the opposite surfaces of the two layers of isolating membranes in a one-to-one correspondence manner, calcium peroxide microcapsules are embedded in the oxygen generating layers, lithium hydroxide microcapsules are embedded in the carbon dioxide absorbing layers, and the oxygen generating layers and the carbon dioxide absorbing layers are compounded in a one-to-one correspondence manner. The oxygen generating layer can slowly release oxygen, the carbon dioxide absorbing layer can absorb carbon dioxide, oxygen filling and vacuumizing operation is not needed any more, platelets can be directly stored in the storage bag, use is convenient, and meanwhile the storage duration of the platelets can be guaranteed.

The invention provides a preparation method of a eutectic solvent for absorbing carbon dioxide and the eutectic solvent. The preparation method of the eutectic solvent for absorbing carbon dioxide comprises the following steps: respectively drying piperazine and tetraethylene glycol to obtain pretreated piperazine and pretreated tetraethylene glycol; the pretreated piperazine and the pretreated tetraethylene glycol are mixed according to the molar ratio of 1: 1-1: 5, and a mixed solution is obtained; continuously introducing nitrogen into the mixed solution for a first specified duration to establish a nitrogen protective atmosphere in the mixed solution; and placing the mixed solution in a sealed reaction bottle, heating and stirring for 2-3 hours at 70-80 DEG C, and then naturally cooling to room temperature to obtain the transparent eutectic solvent. According to the preparation method of the eutectic solvent for absorbing carbon dioxide and the eutectic solvent provided by the invention, the prepared eutectic solvent not only can realize efficient and rapid CO2 absorption, but also is simple in preparation process.

The present application belongs to the technical field of carbon capture, and particularly relates to a method and system for reducing amine loss in the absorption process of carbon capture technology. The method comprises: (1) under the conditions of the presence of a catalyst and bubbling, performing first contact between acid gas and aqueous washing solution to obtain acidified water washing water containing micron-sized bubbles; (2) performing second contact between decarburized amine-containing purified gas and the acidified water washing water, the acidified water washing water absorbing the amine in the amine-containing purified gas to obtain amine-removed purified gas and water washing solution; and (3) dividing the water washing solution into two streams, one of which is subjected to regeneration treatment to obtain amine and is recovered, and the other of which is returned to the aqueous washing solution. The micron-sized bubbles and acid in the acidified water washing water are used to capture the amine-containing aerosol in the gas in the absorption section of the carbon dioxide absorption tower, and the partial pressure of the amine in the gas is reduced, thereby greatly reducing the amine loss in the absorption process of the carbon capture technology.

The application discloses a kind of without heating regeneration carbon dioxide normal temperature removal process and system, belong to natural gas decarburization field;A kind of without heating regeneration carbon dioxide normal temperature removal process, comprising the following steps:S1, raw material gas pretreatment;S2, CO2 absorption;S3, rich liquid flash evaporation;S4, lean liquid regeneration;S5, material circulation;The application is effectively solved by the absorption part of being set, the pain point that edge filler reaction is not sufficient, the low life of central filler;Can shake and scatter adhesion filler ball, clean filter hole impurity, avoid filter hole blockage, further improve gas-liquid mass transfer efficiency;Can buffer knock impact force, prevent that filler plate is damaged;Can effectively protect electric telescopic rod, and maintenance is convenient, need not to disassemble whole tower body, shorten maintenance cycle, guarantee production continuity;Can avoid liquid flooding, channeling phenomenon.

The present invention provides: a carbon dioxide absorbing liquid which has excellent carbon dioxide absorbing performance; a carbon dioxide absorbing liquid which is capable of easily desorbing carbon dioxide when the absorbing liquid is regenerated in addition to having the above-described carbon dioxide absorbing performance; a method for separating carbon dioxide and a method for separating and recovering carbon dioxide, each using the carbon dioxide absorbing liquid; and a device using the carbon dioxide absorbing liquid. The present invention relates to a carbon dioxide absorbing liquid which contains a solvent and a phosphine oxide compound represented by general formula (1) (wherein a, b, and c each represent an integer of 1 to 10, R1, R2, and R3 each independently represent an amino group or a hydroxy group, and at least one of R1, R2, and R3 is an amino group).