Novel metal system for capturing CO2 through electrochemical mediation amine regeneration method and preparation method and application of novel metal system

Abstract

The embodiment of the invention discloses a novel metal system for capturing CO2 through an electrochemical mediation amine regeneration method and a preparation method and application of the novel metal system. The method comprises the following steps: taking metal zinc Zn as an electrode, and taking an organic amine EDA aqueous solution with a preset concentration as an absorbent; the absorbent saturated by CO2 absorption is used as anode liquor; and a solution obtained after a Zn-EDA complex is fully formed in the anolyte serves as catholyte, and the Zn-EDA metal system is prepared. According to the preparation method of the novel metal system for capturing CO2 through the electrochemical mediation amine regeneration method, a novel zinc-organic amine system is provided, that is, metal zinc is used as an electrode, the zinc electrode is not prone to being oxidized and not prone to degrading organic amine, the coordination capacity is high (the zinc electrode and the organic amine generally form a 6-coordination complex), only one valence state of Zn0 / Zn2 + is converted, and the conversion efficiency is high. The energy consumption is low.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of electrochemically mediated amine regeneration, and specifically relate to a new metal system for capturing CO2 by electrochemically mediated amine regeneration, and a preparation method and application thereof. Background Art

[0002] The electrochemical mediated amine regeneration method can achieve carbon dioxide rich liquid regeneration by electrochemical process. It is an innovative process that is completely different from the traditional thermal desorption process. It is different from the traditional power plant and chemical plant using steam heating regeneration. Because of the use of electricity, the risk of coupling the absorbent regeneration with the power plant power generation steam cycle is eliminated. For many heavy industrial plants, electrochemical carbon-mediated amine regeneration technology does not require the construction of a separate steam generator, and can achieve true "plug and play". Another advantage is that in theory, compared with traditional methods, electrochemical regeneration can release CO2 at a higher pressure, thereby significantly reducing the compression energy demand. The electrochemical process can be carried out at room temperature and pressure, avoiding high-temperature degradation of the absorbent, and has a higher theoretical regeneration efficiency and lower regeneration energy consumption.

[0003] At present, the electrochemically mediated amine regeneration system is mainly based on the copper-organic amine system, but copper is easily oxidized as an electrode, and copper ions are prone to degrade amines. Copper ions and organic amines generally form a 4-coordination complex with limited coordination capacity, and the number of CO2 molecules desorbed is small. In addition, the redox reaction of metallic copper undergoes Cu 0 / Cu 1+ , Cu 2+ / Cu 1+ The transition between the two valence states goes through two energy barriers, resulting in relatively high energy consumption. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art, and disclose a new metal system for capturing CO2 by electrochemically mediated amine regeneration, and a preparation method and application thereof.

[0005] In a first aspect, an embodiment of the present disclosure provides a method for preparing a novel metal system for capturing CO2 by electrochemically mediated amine regeneration, the method comprising:

[0006] Using metal zinc Zn as an electrode and an aqueous solution of organic amine EDA with a predetermined concentration as an absorbent;

[0007] The absorbent saturated with CO2 is used as the anolyte;

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

[0009] In some possible embodiments, the metal zinc is a metal zinc sheet.

[0010] In some possible embodiments, the absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA.

[0011] In some possible embodiments, the absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

[0012] In a second aspect, the embodiments of the present disclosure provide a novel metal system for capturing CO2 by electrochemically mediated amine regeneration, comprising:

[0013] Metal zinc Zn is used as an electrode, an organic amine EDA aqueous solution with a predetermined concentration is used as an absorbent, the absorbent saturated with CO2 absorption is used as an anode liquid, and a solution after a Zn-EDA complex is fully formed in the anode liquid is used as a cathode liquid.

[0014] In some possible embodiments, the metal zinc is a metal zinc sheet.

[0015] In some possible embodiments, the absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA.

[0016] In some possible embodiments, the absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

[0017] In a third aspect, an embodiment of the present disclosure provides an application of an electrochemically mediated amine regeneration method for capturing CO2, using the metal system described above.

[0018] The present invention discloses a novel metal system for capturing CO2 by electrochemical mediated amine regeneration, and its preparation method and application. A novel zinc-organic amine system is proposed, that is, metal zinc is used as an electrode. The zinc electrode is not easy to oxidize, not easy to degrade the organic amine, and has a strong coordination ability (generally forming a 6-coordination complex with the organic amine). Only Zn 0 / Zn 2+ A valence state transition with low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 The present invention is a flow chart of a method for preparing a novel metal system for capturing CO2 by electrochemically mediated amine regeneration according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Figure 1 The present invention is a flow chart of a method for preparing a novel metal system for capturing CO2 by electrochemically mediated amine regeneration according to an embodiment of the present invention.

[0026] like Figure 1 As shown, a method for preparing a novel metal system for capturing CO2 by electrochemically mediated amine regeneration method comprises the following steps S101 to S103:

[0027] Step S101: Use metal zinc Zn as an electrode and an organic amine EDA aqueous solution with a predetermined concentration as an absorbent.

[0028] Specifically, in this step, the metal zinc is a metal zinc sheet. The absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA. Preferably, the absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

[0029] Step S102: Use the absorbent saturated with CO2 as the anolyte.

[0030] Step S103, using the solution after the Zn-EDA complex is fully formed in the anode liquid as the cathode liquid to prepare a Zn-EDA metal system.

[0031] The preparation method of the novel metal system for capturing CO2 by electrochemical mediated amine regeneration method in the disclosed embodiment proposes a novel zinc-organic amine system, that is, using metallic zinc as an electrode. The zinc electrode is not easy to oxidize, not easy to degrade the organic amine, and has strong coordination ability (generally forming a 6-coordination complex with the organic amine). Only Zn 0 / Zn 2+ A valence state transition with low energy consumption.

[0032] The performance of the novel metal system for capturing CO2 by electrochemically mediated amine regeneration according to the embodiments of the present disclosure will be described below.

[0033] The Cu-EDA system was used as a control sample in a homemade electrolytic cell at 40 °C. -2 Combined with the TOC test results under constant current test, the power consumption of CO2 desorption per unit of the experimental sample is 27kJe / mol CO2, and the power consumption of CO2 desorption per unit of the control sample is 41kJe / mol CO2. After 100 cycles of reaction, part of the absorbent was taken for testing, and it was found that the EDA of the control sample was partially degraded, while the experimental sample was not degraded.

[0034] Based on the same inventive concept, an embodiment of the present disclosure provides a new metal system for capturing CO2 by electrochemically mediated amine regeneration, comprising: metal zinc Zn as an electrode, an aqueous solution of an organic amine EDA of a predetermined concentration as an absorbent, the absorbent saturated with CO2 absorption as an anode liquid, and a solution after a Zn-EDA complex is fully formed in the anode liquid as a cathode liquid.

[0035] The novel metal system for capturing CO2 by electrochemical mediated amine regeneration in the disclosed embodiment uses metal zinc as an electrode. The zinc electrode is not easily oxidized, not easily degraded by organic amines, and has strong coordination ability (generally forming a 6-coordination complex with organic amines). 0 / Zn 2+ A valence state transition with low energy consumption.

[0036] In some possible embodiments, the metal zinc is a metal zinc sheet.

[0037] In some possible embodiments, the absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA.

[0038] In some possible embodiments, the absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

[0039] Based on the same inventive concept, an embodiment of the present disclosure provides an application of electrochemically mediated amine regeneration method for capturing CO2, using the metal system described above. The specific details of the metal system can be referred to the relevant records above and will not be repeated here.

[0040] The application of the electrochemical mediated amine regeneration method for capturing CO2 in the embodiment of the present disclosure adopts the metal system described above and uses metal zinc as an electrode. The zinc electrode is not easy to oxidize, not easy to degrade the organic amine, and has strong coordination ability (generally forming a 6-coordination complex with the organic amine). Only Zn 0 / Zn 2+ A valence state transition with low energy consumption.

[0041] 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 novel metal system for capturing CO2 by electrochemically mediated amine regeneration, characterized in that: The method comprises: Using metal zinc Zn as an electrode and an aqueous solution of organic amine EDA with a predetermined concentration as an absorbent; The absorbent saturated with CO2 is used as the anolyte; The solution after the Zn-EDA complex is fully formed in the anode liquid is used as the cathode liquid to prepare the Zn-EDA metal system.

2. The method according to claim 1, characterized in that The metal zinc is a metal zinc sheet.

3. The method according to claim 1 or 2, characterized in that: The absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA.

4. The method according to claim 3, characterized in that The absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

5. A novel metal system for capturing CO2 by electrochemically mediated amine regeneration, characterized in that: include: Metal zinc Zn is used as an electrode, an organic amine EDA aqueous solution with a predetermined concentration is used as an absorbent, the absorbent saturated with CO2 absorption is used as an anode liquid, and a solution after a Zn-EDA complex is fully formed in the anode liquid is used as a cathode liquid.

6. The metal system according to claim 5, characterized in that The metal zinc is a metal zinc sheet.

7. The metal system according to claim 5 or 6, characterized in that The absorbent is an aqueous solution of 0.5 mol to 1.5 mol KCl and 0.5 mol to 1.5 mol EDA.

8. The metal system according to claim 7, characterized in that The absorbent is an aqueous solution of 1 mol KCl and 1 mol EDA.

9. An application of electrochemical mediated amine regeneration method to capture CO2, characterized in that: The metal system according to any one of claims 5 to 8 is used.

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