Device and technique for indirectly electric oxidation synthesis of organic substance electrolytic regeneration medium

An electrolysis device and electrolysis regeneration technology, applied in the direction of electrolysis organic production, electrolysis components, electrolysis process, etc., can solve the problems of low reaction time and space efficiency, short motor service life, and easily polluted electrodes, etc., and achieve replacement of diaphragms and filler particles. The effect of convenience, large working current and compact structure

Inactive Publication Date: 2008-09-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a large working current and compact structure in view of the disadvantages of low working current, easily polluted electrodes, short service life of the motor, and low reaction time and space efficiency in the industrialization process of indirect electrooxidative synthesis of organic matter. An electrolysis device and process for indirect electrooxidation synthesis of organic matter electrolysis regeneration medium with convenient maintenance and high space-time efficiency

Method used

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  • Device and technique for indirectly electric oxidation synthesis of organic substance electrolytic regeneration medium
  • Device and technique for indirectly electric oxidation synthesis of organic substance electrolytic regeneration medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The electrolysis device is composed of 15 unit electrolyzers 2 connected in series and pressurized by a plate and frame filter press 1. The unit electrolyzer 2 includes an anode chamber and a cathode chamber separated by a cation diaphragm 5, and the anode chamber is provided with an anode chamber. The anode chamber electrolyte inlet 7 connected with the electrolyte storage tank and the anode chamber electrolyte outlet 8, the cathode chamber is provided with the cathode chamber electrolyte inlet 9 and the cathode chamber electrolyte outlet 10 connected with the catholyte storage tank, the anode The frame body of the anode particle packed bed electrode 3 in the chamber is a mesh titanium basket coated with iridium titanium noble metal oxide coating, the filler particles are graphite particles, and the cathode 4 in the cathode chamber is a copper electrode.

[0025] The anode compartment electrolyte inlet 7 of the unit electrolytic cell is communicated with the anolyte hea...

Embodiment 2-10

[0033] Different particle packed bed anodes were used, and other experimental devices, specific processes and parameters were the same as in Example 1, and the results are shown in Table 1.

[0034] Example

[0035] 5

Embodiment 11

[0037] The electrolysis device is composed of 10 unit electrolyzers connected in series, the cathode adopts a lead-antimony alloy electrode, and the others are the same as in Embodiment 1.

[0038] Specific process: a company uses Mn 2 (SO 4 ) 3 / MnSO 4 As the medium, p-fluorotoluene is synthesized by indirect electro-oxidation to p-fluorobenzaldehyde. In the indirect electro-oxidative synthesis of organic matter, the raw material p-fluorotoluene is replaced by the high-valence medium Mn 2 (SO 4 ) 3 Oxidized to the product p-fluorobenzaldehyde, after the product is separated, the water phase is the reduced low-valence medium MnSO 4 Solution, with the electrolysis device of the present invention, electrolytic regeneration MnSO 4 for Mn 2 (SO 4 ) 3 . Other processing steps are with embodiment 1.

[0039] The electrolysis parameters are controlled as follows: the anolyte solution is 6mol / LH 2 SO 4 solution, Mn 2+ The concentration is 0.5mol / L; the catholyte solution...

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Abstract

The invention discloses an electrolysis unit and a technology used for indirect electric oxo synthesis of organic matters and electrolytic regeneration of media. The electrolysis unit is formed by compression of a plurality of elementary electrolytic cells which are connected in series through a plate-and-frame filter press, wherein, the elementary electrolytic celles comprise anode chambers and cathode chambers which are separated off by cation diaphragms; the anode chambers and the cathode chambers are respectively provided with electrolyte inlets and electrolyte outlets which are communicated with electrolyte storage tanks; and anodes which are arranged inside the anode chambers adopt granular packed bed electrodes which take titanium baskets or titanium baskets provided with coatings as frame bodies. By adoption of the electrolysis unit, low valence state media which are generated during the process of indirect electric oxo synthesis of the organic matters are reoxidized and regenerated into high valence state media through electrolysis. The electrolysis unit has the advantages of large working current, convenient opening of a pressure filter for replacement of the diaphragms and filling of granules, compact structure and high space-time efficiency and is particularly suitable for indirect electric oxidation regeneration reaction by adoption of Mn<3+>/Mn<2+>, Ce<4+>/Ce<3+> and Cr2O7 <2->/Cr 3+> as media.

Description

(1) Technical field [0001] The invention relates to an electrolysis device and process for indirect electro-oxidative synthesis of organic matter, in particular to an electrolytic device and process for industrial indirect electro-oxidation synthesis of organic matter electrolysis regeneration medium. (2) Background technology [0002] Indirect electro-oxidative synthesis is to use the "medium" to carry out oxidation reaction to synthesize organic matter, and then use electrochemical method to regenerate the "medium". The actual synthesis process consumes electrons. This method can overcome the slow electron transfer in the process of direct electrosynthesis of organic matter. It has the disadvantages of low solubility of reactants and easy contamination of electrodes, but has the advantages of fast electron transfer speed, good mass transfer, high current efficiency, and low pollution. Commonly used redox "mediators" are: Mn 3+ / Mn 2+ 、Ce 4+ / C 3+ 、Cr 2 o 7 2- / Cr 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/02C25B3/23
Inventor 甘永平张文魁黄辉
Owner ZHEJIANG UNIV OF TECH
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