Low-corrosivity metal system for capturing CO2 through electrochemical mediation amine regeneration method and preparation method of low-corrosivity metal system

Abstract

The embodiment of the invention discloses a low-corrosion metal system for capturing CO2 through an electrochemical mediation amine regeneration method and a preparation method of the low-corrosion metal system. The method comprises the steps that metal copper Cu serves as an electrode, and an organic amine MMEA aqueous solution doped with non-corrosion sodium salt serves as an absorbent; the absorbent saturated by CO2 absorption is used as anode liquor; and a solution obtained after a Cu-MMEA complex is fully formed in the anolyte serves as catholyte, and the Cu-MMEA metal system is prepared. According to the preparation method of the low-corrosion metal system for capturing CO2 through the electrochemical mediation amine regeneration method, the non-corrosion salt is introduced into the cathode electrolyte and the anode electrolyte, so that the problem that a chlorine-containing solution and a nitrate-containing solution corrode stainless steel in long-term use is solved, and the performance is not affected.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of electrochemical mediated amine regeneration method, and specifically relate to an electrochemical mediated amine regeneration method for capturing CO 2 A low-corrosive metal system and a preparation method thereof. Background Art

[0002] Since the conductivity of organic amine aqueous solution is usually very low, the current electrochemical mediated amine regeneration technology usually requires the addition of NaCl, KCl, NaNO 3 、KNO 3 Salts are used as additives to improve ionic conductivity and reduce resistance caused by charge transfer, thereby reducing cell pressure and energy consumption.

[0003] However, the electrolytic cell is usually made of stainless steel or the like as the cell structure, and then the chlorine-containing and nitrate-containing solutions are prone to corrode the stainless steel electrolytic cell during long-term use, which has been found in actual applications. Summary of the invention

[0004] The embodiments of the present disclosure are intended to solve at least one of the technical problems existing in the prior art, and disclose an electrochemical mediated amine regeneration method for capturing CO 2 A low-corrosive metal system and a preparation method thereof.

[0005] In a first aspect, the embodiments of the present disclosure provide a method for capturing CO by electrochemically mediated amine regeneration. 2 A method for preparing a low-corrosive metal system, the method comprising:

[0006] Metal copper Cu is used as an electrode, and an aqueous solution of organic amine MMEA doped with a non-corrosive sodium salt is used as an absorbent;

[0007] CO 2 Absorbing the saturated absorbent as anolyte;

[0008] The solution after the Cu-MMEA complex is fully formed in the anode liquid is used as the cathode liquid to prepare the Cu-MMEA metal system.

[0009] In some possible embodiments, the non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

[0010] In some possible embodiments, the non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio.

[0011] In some possible embodiments, the molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol.

[0012] In some possible embodiments, the molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

[0013] In a second aspect, the embodiments of the present disclosure provide a method for capturing CO by electrochemically mediated amine regeneration. 2 Low corrosion metal systems including:

[0014] Metallic copper Cu was used as the electrode, and an aqueous solution of organic amine MMEA doped with non-corrosive sodium salt was used as the absorbent. 2 The saturated absorbent is used as the anolyte, and the solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte.

[0015] In some possible embodiments, the non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

[0016] In some possible embodiments, the non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio.

[0017] In some possible embodiments, the molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol.

[0018] In some possible embodiments, the molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

[0019] The electrochemical mediated amine regeneration method for capturing CO in the embodiment of the present disclosure 2 The low-corrosive metal system and its preparation method eliminate the problem of corrosion of stainless steel by chlorine-containing and nitrate-containing solutions during long-term use by introducing non-corrosive salts into the cathode and anode electrolytes without affecting the performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0021] Figure 1 The present invention discloses an embodiment of an electrochemical mediated amine regeneration method for capturing CO 2 Flow chart of a method for preparing a low-corrosive metal system. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0023] Unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "including" or "comprising" used in the embodiments of the present disclosure neither limits the shapes, numbers, steps, actions, operations, components, originals and / or their groups mentioned, nor excludes the appearance or addition of one or more other different shapes, numbers, steps, actions, operations, components, originals and / or their groups, or the addition of these. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] Unless otherwise specifically stated, the relative arrangement of the components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure. At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship, and the techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and devices shown should be considered as part of the authorized specification. In all examples shown and discussed here, any specific other examples may have different values. It should be noted that similar symbols and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0025] In the description of the embodiments of the present disclosure, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the embodiments of the present disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in the embodiments of the present disclosure and the features of the different embodiments or examples, unless they are contradictory.

[0026] Figure 1 The present invention discloses an embodiment of an electrochemical mediated amine regeneration method for capturing CO 2 A flow chart of a method for preparing a low-corrosive metal system. Figure 1 As shown, a method for capturing CO by electrochemical mediated amine regeneration 2 A method for preparing a low-corrosive metal system, the method comprising the following steps S101 to S103:

[0027] Step S101: Use metal copper Cu as an electrode and use an organic amine MMEA aqueous solution doped with a non-corrosive sodium salt as an absorbent.

[0028] Specifically, in this step, the non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

[0029] In some embodiments, the non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio. In some preferred embodiments, the molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol. Further preferably, the molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

[0030] Step S102: CO 2 The saturated absorbent is used as the anolyte.

[0031] Step S103, using the solution after the Cu-MMEA complex is fully formed in the anode liquid as the cathode liquid to prepare the Cu-MMEA metal system.

[0032] The electrochemical mediated amine regeneration method for capturing CO in the embodiment of the present disclosure 2The invention discloses a method for preparing a low-corrosive metal system, which eliminates the problem of corrosion of stainless steel by chlorine-containing and nitrate-containing solutions during long-term use by introducing non-corrosive salts into the cathode and anode electrolytes without affecting the performance.

[0033] The following will be divided into several embodiments to describe the electrochemical mediated amine regeneration method for capturing CO 2 The preparation method of the low-corrosive metal system is described in detail.

[0034] Example 1

[0035] Metal copper Cu was used as the electrode, and 0.5 mol potassium iodide KI and 0.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0036] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 45 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0037] Example 2

[0038] Metal copper Cu was used as the electrode, and 1.5 mol potassium iodide KI and 1.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0039] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 50 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0040] Example 3

[0041] Metal copper Cu was used as the electrode, and 1 mol potassium iodide KI and 1 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0042] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 48 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0043] Example 4

[0044] Metal copper Cu was used as the electrode, and 0.5 mol potassium bromide KBr and 0.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0045] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 46 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0046] Example 5

[0047] Metal copper Cu was used as the electrode, and 1.5 mol potassium bromide KBr and 1.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0048] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 48 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0049] Example 6

[0050] Metal copper Cu was used as the electrode, and 1 mol potassium bromide KBr and 1 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0051] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 49 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0052] Example 7

[0053] Metal copper Cu was used as the electrode, and 0.5 mol sodium iodide NaI and 0.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0054] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 48 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0055] Example 8

[0056] Metal copper Cu was used as the electrode, and 1.5 mol sodium iodide NaI and 1.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0057] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 48 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0058] Example 9

[0059] Metal copper Cu was used as the electrode, and 1 mol sodium iodide NaI and 1 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0060] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 50 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0061] Example 10

[0062] Metal copper Cu was used as the electrode, and 0.5 mol sodium bromide NaBr and 0.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0063] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 45 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0064] Embodiment 11

[0065] Metal copper Cu was used as the electrode, and 1.5 mol sodium bromide NaBr and 1.5 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0066] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 46 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0067] Example 12

[0068] Metal copper Cu was used as the electrode, and 1 mol sodium bromide NaBr and 1 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0069] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 47 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed and no corrosion occurred.

[0070] Comparison Example

[0071] Metal copper Cu was used as the electrode, and 1 mol potassium chloride KCl and 1 mol organic amine MMEA aqueous solution were used as absorbents. 2 The saturated absorbent is used as the anolyte. The solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte to prepare the Cu-MMEA metal system.

[0072] In a homemade stainless steel electrolytic cell at 40°C, 10 mA cm -2 Combined with TOC test results under constant current test, unit CO 2 The desorption power consumption is 45 kJe / mol CO 2 After 100 hours of reaction, the stainless steel electrolytic cell was observed to have corrosion.

[0073] Based on the same inventive concept, the embodiments of the present disclosure provide a method for capturing CO by electrochemical mediated amine regeneration. 2 The low-corrosive metal system is prepared by the preparation method described above. For details, please refer to the relevant records in the previous text and will not be repeated here. The metal system includes: metal copper Cu as an electrode, an organic amine MMEA aqueous solution doped with non-corrosive sodium salt as an absorbent, CO 2 The saturated absorbent is used as the anolyte, and the solution after the Cu-MMEA complex is fully formed in the anolyte is used as the catholyte.

[0074] The electrochemical mediated amine regeneration method for capturing CO in the embodiment of the present disclosure 2 The low-corrosive metal system introduces non-corrosive salts into the cathode and anode electrolytes, eliminating the problem of chlorine-containing and nitrate-containing solutions corroding stainless steel during long-term use without affecting performance.

[0075] In some possible embodiments, the non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

[0076] In some possible embodiments, the non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio.

[0077] In some possible embodiments, the molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol.

[0078] In some possible embodiments, the molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

[0079] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A method for preparing a low-corrosive metal system for capturing CO2 by electrochemically mediated amine regeneration, characterized in that: The method comprises: Metal copper Cu is used as an electrode, and an aqueous solution of organic amine MMEA doped with a non-corrosive sodium salt is used as an absorbent; The absorbent saturated with CO2 is used as the anolyte; The solution after the Cu-MMEA complex is fully formed in the anode liquid is used as the cathode liquid to prepare the Cu-MMEA metal system.

2. The method according to claim 1, characterized in that The non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

3. The method according to claim 1, characterized in that The non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio.

4. The method according to claim 3, characterized in that: The molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol.

5. The method according to claim 4, characterized in that The molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

6. A low-corrosive metal system for capturing CO2 by electrochemically mediated amine regeneration, characterized in that: include: Metal copper Cu is used as an electrode, an organic amine MMEA aqueous solution doped with a non-corrosive sodium salt is used as an absorbent, the absorbent saturated with CO2 absorption is used as an anolyte, and a solution after a Cu-MMEA complex is fully formed in the anolyte is used as a catholyte.

7. The metal system according to claim 6, characterized in that The non-corrosive sodium salt includes at least one of potassium iodide KI, potassium bromide KBr, sodium iodide NaI and sodium bromide NaBr.

8. The metal system according to claim 6, characterized in that The non-corrosive sodium salt and the organic amine are prepared in an equimolar ratio.

9. The metal system according to claim 8, characterized in that The molar amount of the non-corrosive sodium salt ranges from 0.5 mol to 1.5 mol, and the molar amount of the organic amine MMEA ranges from 0.5 mol to 1.5 mol.

10. The metal system according to claim 9, characterized in that The molar amount of the non-corrosive sodium salt is 1 mol, and the molar amount of the organic amine MMEA is 1 mol.

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