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Electrolysis-electrodialysis cell for hydrogen iodide concentration

An electrodialysis cell and hydrogen iodide technology, applied in the field of electrochemistry, can solve the problems of easy movement, folding, pulverization, and large internal resistance of the battery, and achieve the effects of high chemical stability, fast passage, and small internal resistance

Active Publication Date: 2020-07-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a kind of electrolysis-electrodialysis cell that is used for hydrogen iodide concentration in view of the deficiencies and defects of the prior art, aiming at solving the following problems existing in the existing electrolysis-electrodialysis cell: 1) up and down The plate needs to be engraved with flow channels on both sides, which is difficult to process and high in processing cost; 2) The internal resistance of the battery is large when the cathode side and anode side supports are made of PTFE mesh; 3) The cathode and anode side supports are made of activated carbon fiber cloth 4) When carbon fiber cloth (including activated carbon fiber cloth) or graphite cloth is used as the cathode side and anode side support body, it is not easy to fix inside the battery, and it is easy to move, fold and other problems , which seriously affects battery performance

Method used

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  • Electrolysis-electrodialysis cell for hydrogen iodide concentration
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Experimental program
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Embodiment 1

[0032] Adopt the scheme of the present invention, make the electrolysis-electrodialysis cell that is made of 10 single cells stacked in sequence, the proton selective permeation membrane selects Nafion 117CS (Du Pont Company) proton exchange membrane, the effective membrane of each single cell Area 36cm 2 The two sides of the proton selective permeable membrane are sequentially and symmetrically distributed with a cathode side support body, an upper pole plate, an anode support side support body, and a lower pole plate. Both the cathode-side support and the anode-side support were 0.5 mm graphite felt (porosity 70%, carbon content 98%). Both the upper plate and the lower plate are tantalum metal plates with a thickness of 1mm. On the cathode side and the anode side, a carbon fiber grid is laid between the electrode plate and the graphite felt to enhance the ability of the graphite felt to maintain its shape.

[0033] The cathode side support body and the anode side support b...

Embodiment 2

[0037] Adopt the scheme of the present invention, make the electrolysis-electrodialysis cell that is made of 10 single cells stacked in sequence, the proton selective permeation membrane selects Nafion 117CS (Du Pont Company) proton exchange membrane, the effective membrane of each single cell Area 1200cm 2 The two sides of the proton selective permeable membrane are sequentially and symmetrically distributed with a cathode side support, an upper pole plate, an anode side support body, and a lower pole plate. Both the cathode-side support and the anode-side support were 1.5 cm graphite felt (92% porosity, 99.8% carbon content). Before the graphite felt was assembled, the Pt / C catalyst dispersed in the Nafion solution was sprayed on the side facing the proton selective permeable membrane, and then dried at 120°C for 5 hours to obtain the graphite felt support loaded with the Pt catalyst.

[0038] Both the upper plate and the lower plate are hard graphite plates with a thicknes...

Embodiment 3

[0044] Adopt the scheme of the present invention, make the electrolysis-electrodialysis cell that is made of 50 successively stacked single cells, the proton selective permeation membrane selects Nafion 115 (Du Pont Company) proton exchange membrane, the effective membrane of each single cell Area 2000cm 2 The two sides of the proton selective permeable membrane are sequentially and symmetrically distributed with a cathode side support, an upper pole plate, an anode side support body, and a lower pole plate. Both the cathode-side support and the anode-side support were 5.6 mm graphite felt (92% porosity, 99.8% carbon content). A layer of carbon fiber grid is wrapped in the above-mentioned graphite felt. Before its assembly, the Pt / C catalyst dispersed in Nafion solution is sprayed on the side facing the proton selective permeable membrane, and then dried at 120 ° C for 5 hours. A graphite felt support loaded with Pt catalyst was obtained.

[0045] Both the upper plate and th...

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Abstract

The invention discloses an electrolysis-electrodialysis cell for hydrogen iodide concentration, and belongs to the technical field of electrochemistry. The electrolysis-electrodialysis cell includes at least one single cell, each single cell including a proton selective permeable membrane, a cathode-side support body, an anode-side support body, a seal ring, and upper and lower pole plates. The cathode side support body and the anode side support body adopt graphite felts; the upper pole plate and the lower pole plate are of flat-plate-shaped structures. The invention is characterized in thata large-porosity graphite felt material is adopted, good filling and supporting effects can be provided, HIx materials can evenly and rapidly pass through the interior, the electrolysis-electrodialysis cell can be stably used for a long time under the conditions of HIx material liquid soaking and high-current electrochemical reaction, and therefore the efficiency of electrochemical reaction in theelectrolysis-electrodialysis cell is further improved. The upper pole plate and the lower pole plate are of a flat-plate-shaped structure, the problems of large machining difficulty, high machining cost and the like caused by flow channel engraving are solved, and the advantages of high efficiency, stability, compactness and low cost are achieved.

Description

technical field [0001] The present invention relates to an electrochemical treatment device, in particular to an electrolysis-electrodialysis cell, which is suitable for use in iodine-containing hydrogen iodide solution (i.e. HI-I 2 -H 2 The concentration of hydrogen iodide (HI) in (2 mixed solution) and the application in the electrochemical preparation of HI or hydroiodic acid belong to the field of electrochemical technology. Background technique [0002] Electrolysis-electrodialysis (EED, also known as ion-exchange membrane electrolysis, or membrane electrolysis) is a highly efficient electrochemical concentration method that can also be used for the electrochemical synthesis of specific chemicals. An electrolysis-electrodialysis cell (EED cell) that can be used under harsh conditions such as high temperature, acid, alkali, and strong oxidant is of great practical value. [0003] Electrolysis-electrodialysis has been applied in thermochemical iodine-sulfur cycle splitt...

Claims

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Application Information

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IPC IPC(8): C25B1/24C25B9/10C25B9/04C01B7/13C25B9/23
CPCC25B1/24C01B7/13C25B9/65C25B9/23
Inventor 陈崧哲张平王来军
Owner TSINGHUA UNIV