An energy-saving and environmentally friendly phase-change CO2 capture absorbent
By using a phase change CO2 capture absorbent composed of a mixed liquid of hydroxyethylethylenediamine and NN diethylhydroxylamine and nanoparticle iron oxide, the problems of small absorption capacity, low desorption efficiency and high regeneration energy consumption are solved, and efficient CO2 capture is achieved.
Patent Information
- Application Number
- CN202411924321.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2044-12-25
AI Technical Summary
Existing phase change CO2 capture absorbents have problems such as small absorption capacity, low desorption efficiency, unstable phase separation and high regeneration energy consumption.
A mixed liquid with hydroxyethylethylenediamine and NN diethylhydroxylamine as the main components is added with nano-particle reinforcing agent iron oxide to form an energy-saving and environmentally friendly phase change CO2 capture absorbent.
It improves the absorption capacity of CO2, reduces the regeneration energy consumption, enhances the desorption effect, and realizes the energy-saving and environmentally friendly treatment of CO2 capture.
Smart Images
Figure CN119733346B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of carbon dioxide capture absorbent, and particularly relates to an energy-saving and environment-friendly phase change CO2 capture absorbent. BACKGROUND
[0002] The combustion of fossil energy leads to a large amount of carbon dioxide emission, and controlling CO2 emission is the most feasible measure to alleviate global climate warming. The carbon capture, utilization and storage (CCUS) technology is one of the effective strategies to greatly reduce CO2 emission. In view of the large amount of carbon emission and the difficulty of capture in coal-fired power plants, compared with other technologies such as physical adsorption and membrane absorption, the chemical absorption method is a relatively perfect and most widely used post-combustion capture path, and the chemical absorbent used in the chemical absorption method is mainly a relatively mature organic amine solvent system. However, the traditional organic amine method also has the disadvantage of high energy consumption, and the regeneration energy consumption accounts for more than 60%, so the high energy consumption greatly limits its development.
[0003] Existing research has shifted from single or multi-component amine absorbent to phase change absorbent (two-phase absorbent), low-water absorbent and ionic liquid. Because the ionic liquid has too large viscosity and high energy consumption and cost, it is temporarily difficult to be industrialized. Therefore, the formation of two incompatible phase change solvents by carbon dioxide absorption has attracted more and more interest. Compared with the traditional chemical absorbent, the phase change solvent system represents a kind of material that is expected to significantly reduce the regeneration energy consumption. Compared with the non-phase change process, only the rich phase needs to be regenerated, so the energy consumption demand is significantly reduced.
[0004] The phase change absorbent can be divided into two phase change modes of phase change delamination after absorption and phase change delamination after regeneration, but the research focus is mainly on the absorption system of phase change delamination after absorption. The liquid-liquid phase change absorbent is usually composed of amine, organic solvent and water, and can be divided into single phase change absorbent, multi-component mixed absorbent and water-free absorbent according to the solution system. However, the existing phase change absorbent still has the disadvantages of small absorption capacity, low desorption efficiency, unstable phase separation and high regeneration energy consumption. Therefore, in view of the above technical problems, it is necessary to provide an energy-saving and environment-friendly phase change CO2 capture absorbent. SUMMARY
[0005] The present application relates to the technical field of carbon dioxide capture absorbent, and particularly relates to an energy-saving and environment-friendly phase change CO2 capture absorbent.
[0006] To achieve the above-mentioned application purposes, the technical scheme adopted by the present application is as follows:
[0007] An energy-saving and environment-friendly phase-change CO2 capture absorbent is a mixed liquid prepared from the following components in percentage by mass: 20%-30% hydroxyethylethylenediamine, 20-30% NN diethylhydroxylamine, and 50-60% solvent.
[0008] Furthermore, the absorbent also includes nanoparticle strengthener iron oxide.
[0009] Preferably, the amount of the nanoparticle strengthening agent iron oxide added is 1.5%-2.0% of the mass of the mixed solution.
[0010] Preferably, the absorbent is a mixed liquid prepared by configuring the following components in percentage by mass: 20% hydroxyethylethylenediamine, 30% NN diethylhydroxylamine, and 50% solvent; the absorbent also includes nanoparticle strengthener iron oxide, and the amount of nanoparticle strengthener iron oxide added is 2.0% of the mass of the mixed liquid.
[0011] Preferably, the solvent is one of sulfolane, n-propanol, diethylene glycol dimethyl ether, and dimethyl sulfoxide.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] The CO2 capture absorbent in the present invention can increase the absorption capacity of CO2 and improve the capture rate of CO2, while also reducing regeneration energy consumption and improving the desorption effect, thereby achieving the energy-saving and environmentally friendly treatment requirements of CO2 capture. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 The figures are effect diagrams of the absorption load and absorption time of the absorbents prepared in the examples of the present invention;
[0015] Figure 2 The figures are effect diagrams of the absorption rate and absorption time of the absorbents prepared in the examples of the present invention;
[0016] Figure 3 The effect diagram of the desorption load and absorption time of the absorbent prepared in the examples of the present invention is shown;
[0017] Figure 4 The figures are effect diagrams of desorption rate and absorption time of the absorbents prepared in the examples of the present invention;
[0018] Figure 5 These are the layered effect diagrams of the absorbents prepared in the examples of the present invention. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below with reference to specific embodiments.
[0020] Example 1
[0021] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is a mixed solution prepared by configuring the following components in percentage by weight: 20g of hydroxyethylethylenediamine (AEEA), 20g of NN-diethylhydroxylamine (DEHA), and 60g of sulfolane.
[0022] Preparation method: AEEA and DEHA are weighed according to a ratio and added into a container, and then sulfolane is added, and the mixture is stirred evenly to obtain a phase change CO2 capture absorbent.
[0023] Process for testing the absorption performance of the absorbent: Place the container containing the absorbent of this embodiment in a 40°C constant temperature water bath and keep it warm to 40°C, then introduce high-purity carbon dioxide gas until the absorbent is saturated with absorption. During the absorption process, the absorption load of the phase change absorption solvent is recorded using the difference between the mass flow meter and the wet flow meter. By differentiating the relationship between the absorption load and time, the relationship between the absorption rate of the solution and time can be obtained. The rich phase after absorption is placed in a 130°C oil bath for heating and desorption, and the wet flow meter value is recorded as the desorption load of the solvent. By differentiating the relationship between the desorption load and time, the relationship between the desorption rate of the solution and time can be obtained.
[0024] Result: After the absorbent is saturated, liquid-liquid phase transition occurs. Figure 5 As shown in the figure, the upper liquid phase is the lean phase and the lower liquid phase is the rich phase. The volume of the rich phase is 57 mL and the volume of the lean phase is 45 mL. Figure 1 and Figure 2 As shown, after 40 minutes of absorption, the absorption amount of the absorbent is 0.81 molCO2 / mol, and the absorption rate is 4.82e -4 mol / mol / s; e.g. Figure 3 and Figure 4 As shown, the desorption amount of the absorbent is 0.63 molCO2 / mol, and the desorption rate is 2.9e -4 mol / mol / s.
[0025] Example 2
[0026] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is prepared from a mixture of the following components in percentage by weight: 20g of hydroxyethylethylenediamine (AEEA), 30g of NN-diethylhydroxylamine (DEHA), and 50g of sulfolane; the absorbent also includes 1.6g of nanoparticle enhancer iron oxide.
[0027] Preparation method: AEEA, DEHA and nanoparticle enhancer iron oxide are weighed according to the ratio and added into a container, and then sulfolane is added, and the mixture is stirred evenly to obtain a phase change CO2 capture absorbent.
[0028] The process of detecting the absorption and desorption performance of the absorbent remains consistent with that of Example 1.
[0029] Results: After the absorption of the absorbent is saturated, liquid-liquid phase transition occurs. As shown in Figure 5 , the upper liquid phase is the lean phase, and the lower liquid phase is the rich phase. The volume of the rich phase is 56 mL, and the volume of the lean phase is 46 mL. As shown in Figure 1 and Figure 2 , after 40 min of absorption of the absorbent, the absorption amount of the absorbent is 0.93 mol CO2 / mol, and the absorption rate is 4.92e -4 mol / mol / s; as shown in Figure 3 and Figure 4 , the desorption amount of the absorbent is 0.69 mol CO2 / mol, and the desorption rate is 3.19e -4 mol / mol / s.
[0030] Example 3
[0031] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is obtained by mixing the following components with mass percentage: 20 g of hydroxyethyl ethylenediamine (AEEA), 20 g of N-N diethylhydroxylamine (DEHA), and 60 g of n-propanol; the absorbent further includes 1.9 g of nanoparticle reinforcing agent iron oxide.
[0032] The preparation method and the process of detecting the absorption and desorption performance of the absorbent are consistent with those of Example 1.
[0033] Results: After the absorption of the absorbent is saturated, liquid-liquid phase transition occurs. As shown in Figure 5 , the upper liquid phase is the lean phase, and the lower liquid phase is the rich phase. The volume of the rich phase is 57 mL, and the volume of the lean phase is 45 mL. As shown in Figure 1 and Figure 2 , after 40 min of absorption of the absorbent, the absorption amount of the absorbent is 0.97 mol CO2 / mol, and the absorption rate is 4.93e -4 mol / mol / s; as shown in Figure 3 and Figure 4 , the desorption amount of the absorbent is 0.71 mol CO2 / mol, and the desorption rate is 3.29e -4 mol / mol / s.
[0034] Example 4
[0035] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is obtained by mixing the following components with mass percentage: 20 g of hydroxyethyl ethylenediamine (AEEA), 30 g of N-N diethylhydroxylamine (DEHA), and 50 g of n-propanol; the absorbent further includes 2.0 g of nanoparticle reinforcing agent iron oxide.
[0036] The preparation method and the detection of the absorption and desorption performance of the absorbent are consistent with those of Example 1.
[0037] Result: After the absorbent is saturated, liquid-liquid phase transition occurs. As shown in Figure 5 , the upper liquid phase is the lean phase, and the lower liquid phase is the rich phase. The volume of the rich phase is 56 mL, and the volume of the lean phase is 46 mL. As shown in Figure 1 and Figure 2 , after the absorbent absorbs for 40 min, the absorption amount of the absorbent is 1.03 mol CO2 / mol, and the absorption rate is 4.91e -4 mol / mol / s; as shown in Figure 3 and Figure 4 , the desorption amount of the absorbent is 0.72 mol CO2 / mol, and the desorption rate is 3.09e -4 mol / mol / s.
[0038] Example 5
[0039] An energy-saving and environment-friendly phase change CO2 capture absorbent is obtained by mixing the following components with mass percentage: 20 g of hydroxyethyl ethylenediamine (AEEA), 20 g of N-N diethylhydroxylamine (DEHA), and 60 g of diethylene glycol dimethyl ether; the absorbent further comprises 1.5 g of nanoparticle reinforcing agent iron oxide.
[0040] The preparation method and the detection of the absorption and desorption performance of the absorbent are consistent with those of Example 1.
[0041] Result: After the absorbent is saturated, liquid-liquid phase transition occurs. As shown in Figure 5 , the upper liquid phase is the lean phase, and the lower liquid phase is the rich phase. The volume of the rich phase is 59 mL, and the volume of the lean phase is 43 mL. As shown in Figure 1 and Figure 2 , after the absorbent absorbs for 40 min, the absorption amount of the absorbent is 1.04 mol CO2 / mol, and the absorption rate is 4.92e -4 mol / mol / s; as shown in Figure 3 and Figure 4 , the desorption amount of the absorbent is 0.73 mol CO2 / mol, and the desorption rate is 3.29e -4 mol / mol / s.
[0042] Example 6
[0043] An energy-saving and environment-friendly phase change CO2 capture absorbent is obtained by mixing the following components with mass percentage: 20 g of hydroxyethyl ethylenediamine (AEEA), 20 g of N-N diethylhydroxylamine (DEHA), and 60 g of diethylene glycol dimethyl ether; the absorbent further comprises 1.5 g of nanoparticle reinforcing agent iron oxide.
[0044] The preparation method and the process of detecting the absorption and desorption performance of the absorbent are consistent with those in Example 1.
[0045] Result: After the absorbent is saturated, liquid-liquid phase transition occurs. Figure 5 As shown in the figure, the upper liquid phase is the lean phase and the lower liquid phase is the rich phase. The volume of the rich phase is 60 mL and the volume of the lean phase is 42 mL. Figure 1 and Figure 2 As shown, after 40 minutes of absorption, the absorption amount of the absorbent is 1.04 molCO2 / mol, and the absorption rate is 4.82e -4 mol / mol / s; e.g. Figure 3 and Figure 4 As shown, the desorption amount of the absorbent is 0.77 molCO2 / mol, and the desorption rate is 3.39e -4 mol / mol / s.
[0046] Example 7
[0047] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is prepared from a mixture of the following components in percentage by weight: 20g of hydroxyethylethylenediamine (AEEA), 20g of NN-diethylhydroxylamine (DEHA), and 60g of dimethyl sulfoxide; the absorbent also includes 1.9g of nanoparticle enhancer iron oxide.
[0048] The preparation method and the process of detecting the absorption and desorption performance of the absorbent are consistent with those in Example 1.
[0049] Result: After the absorbent is saturated, liquid-liquid phase transition occurs. Figure 5 As shown in the figure, the upper liquid phase is the lean phase and the lower liquid phase is the rich phase. The volume of the rich phase is 59 mL and the volume of the lean phase is 43 mL. Figure 1 and Figure 2 As shown, after 40 minutes of absorption, the absorption amount of the absorbent is 1.08 molCO2 / mol, and the absorption rate is 4.42e -4 mol / mol / s; e.g. Figure 3 and Figure 4 As shown, the desorption amount of the absorbent is 0.82 molCO2 / mol, and the desorption rate is 3.17e -4 mol / mol / s.
[0050] Example 8
[0051] An energy-saving and environmentally friendly phase-change CO2 capture absorbent is prepared from a mixture of the following components in percentage by weight: 20g of hydroxyethylethylenediamine (AEEA), 30g of NN-diethylhydroxylamine (DEHA), and 50g of dimethyl sulfoxide; the absorbent also includes 2.0g of nanoparticle strengthener iron oxide.
[0052] The preparation method and the detection of the absorption and desorption performance of the absorbent are consistent with those of Example 1.
[0053] Results: After the absorbent is saturated, a liquid-liquid phase transition occurs. As shown in Figure 5 , the upper liquid phase is a lean phase, and the lower liquid phase is a rich phase. The volume of the rich phase is 60 mL, and the volume of the lean phase is 42 mL. As shown in Figure 1 and Figure 2 , after the absorbent absorbs for 40 min, the absorption amount of the absorbent is 1.28 mol CO2 / mol, and the absorption rate is 4.32e -4 mol / mol / s; as shown in Figure 3 and Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 1 Figure 2 , the desorption amount of the absorbent is 0.85 mol CO2 / mol, and the desorption rate is 3.21e -4 mol / mol / s.
[0054] The phase separation phenomenon occurs after the phase change absorbent for capturing carbon dioxide provided in Examples 1-8 absorbs carbon dioxide. The absorption load, desorption load, and phase separation volume are as shown in the following table.
[0055]
[0056] Among them, the CO2 load of the phase change absorbent for capturing carbon dioxide provided in Example 8 (i.e., the content of AEEA and DEHA is 50% of the total mass) is the highest when the amount of nanoparticles is 2.0 g: 1.28 mol CO2 / mol; the CO2 load of the phase change absorbent for capturing carbon dioxide provided in Example 1 (i.e., the content of AEEA and DEHA is 40% of the total mass) is the lowest: 0.81 mol CO2 / mol.
[0057] In summary, according to the above experimental results, it can be known that the content of the absorbent and the amount of nanoparticles added have a certain effect on CO2 absorption. Among them, the CO2 absorbent prepared by adding 2.0% of the mass of the mixed solution of 20% hydroxyethyl ethylenediamine, 30% N-N diethylhydroxylamine, and 50% solvent as a nanoparticle intensifier of iron oxide has the best use effect.
Claims
1. An energy-saving and environmentally friendly phase-change CO2 capture absorbent, characterized in that: The mixed liquid is prepared by configuring the following components in percentage by mass: 20%-30% of hydroxyethylethylenediamine, 20%-30% of NN diethylhydroxylamine, and 50%-60% of solvent.
2. The energy-saving and environmentally friendly phase-change CO2 capture absorbent according to claim 1, characterized in that: Also included is the nanoparticle strengthener iron oxide.
3. The energy-saving and environmentally friendly phase-change CO2 capture absorbent according to claim 2, characterized in that: The added amount of the nano-particle reinforcing agent iron oxide is 1.5%-2.0% of the mass of the mixed solution.
4. The energy-saving and environmentally friendly phase-change CO2 capture absorbent according to claim 3, characterized in that: The mixed liquid is prepared by configuring the following components in percentage by mass: 20% hydroxyethylethylenediamine, 30% NN diethylhydroxylamine, and 50% solvent; the absorbent also includes nanoparticle strengthener iron oxide, and the amount of the nanoparticle strengthener iron oxide added is 2.0% of the mass of the mixed liquid.
5. The energy-saving and environmentally friendly phase-change CO2 capture absorbent according to claim 1 or 2, characterized in that: The solvent is one of sulfolane, n-propanol, diethylene glycol dimethyl ether and dimethyl sulfoxide.