Dipolar membranes of middle boundary layer of complexation metal catalysis, and preparation method

A complex metal and bipolar membrane technology, applied in the field of electrodialysis, can solve the problem of high cost of separating lactic acid, and achieve the effects of not easy to fall off or dissolve, long service life and strong adhesion

Inactive Publication Date: 2007-05-09
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of high cost of separating lactic acid by four-compartment electrodialysis, the present invention provides a complex metal-catalyzed intermediate interface layer bipolar membrane and a preparation method thereof. Salt is converted to lactic acid and base is recovered

Method used

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  • Dipolar membranes of middle boundary layer of complexation metal catalysis, and preparation method
  • Dipolar membranes of middle boundary layer of complexation metal catalysis, and preparation method
  • Dipolar membranes of middle boundary layer of complexation metal catalysis, and preparation method

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specific Embodiment approach 1

[0030] Embodiment 1: The complex metal-catalyzed intermediate interface layer bipolar membrane in this embodiment is composed of a cation exchange membrane layer, an intermediate interface layer containing a complex metal catalyst, and an anion exchange membrane layer.

[0031] Wherein: the complex metal catalyst is a metal complex containing Sn, Cr, Ni, Fe, Ru, Mn, Ti, Co, Cu, Pt, Rb or Zn; the cation exchange membrane layer contains 15 to 25 wt .% of sulfonated polyphenylene ether; the anion exchange membrane layer contains 15-25wt.% of chloromethylated polysulfone.

specific Embodiment approach 2

[0032] Specific embodiment 2: In this embodiment, a complex metal-catalyzed intermediate interface layer bipolar membrane is prepared according to the following steps:

[0033] a. Preparation of cationic membrane material: take the dried polyphenylene ether and dissolve it in anhydrous and alcohol-free chloroform, add dropwise the mixed solution formed by dissolving the sulfonating agent in anhydrous and alcohol-free chloroform, control the sulfonating agent and polyphenylene ether The molar ratio of ether is 0.8:1 to 1:1.4, and the dropwise addition is completed in about 20 to 40 minutes. The reaction temperature is controlled at 23 to 28°C, the reaction time is 3 to 7 hours, and it is left to stand for 20 to 40 minutes. The substance precipitated out, and the upper clear night was poured out, and the remaining viscous substance was poured into deionized water, washed and filtered, then transformed in NaCl solution, and dried for later use.

[0034] b. Preparation of anion me...

specific Embodiment approach 3

[0040] Specific implementation mode three: In this implementation mode, a complex metal-catalyzed intermediate interface layer bipolar membrane is prepared according to the following steps:

[0041] a. Preparation of cationic membrane material: take the dried polyphenylene ether and dissolve it in anhydrous alcohol-free chloroform, add dropwise the mixed solution formed by dissolving the sulfonating agent in anhydrous alcohol-free chloroform, control the sulfonating agent and polyphenylene ether The molar ratio of phenyl ether is 0.9:1, the dropwise addition is completed in 25 minutes, the reaction temperature is controlled at 26°C, the reaction time is 5 hours, and it is left to stand for 20 to 40 minutes, flocculent viscous matter is precipitated, and the upper layer is poured out to clear the night, and the remaining Pour the viscous material into deionized water, wash and filter, then invert in 0.5-2mol / L NaCl solution, and dry it for later use.

[0042] b. Preparation of ...

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Abstract

A bipolar membrane combined with anionic and cationic exchange films for converting ammunium lactate to lactic acid while recovering ammonia water is composed of cationic exchange film, middle interface layer containing complexing metallic catalyst, and anionic exchange film.

Description

technical field [0001] The invention belongs to the technical field of electrodialysis, and relates to a complex metal-catalyzed intermediate interface layer bipolar membrane and a preparation method thereof. Background technique [0002] Bipolar membrane (BPM) is a new type of membrane that has been actively researched internationally in recent years. It is usually composed of a cation exchange layer and an anion exchange layer. Under the action of an electric field, it can play the role of "dissociation" of water, producing hydrogen ions and hydroxide ions instead of hydrogen and oxygen. The bipolar membrane electrodialysis system composed of bipolar membranes and other anion and cation exchange membranes can regenerate and recycle certain material resources, reduce material and energy consumption, reduce waste emissions, eliminate environmental pollution and certain acids and The separation and preparation of bases provide new ways. [0003] After more than 40 years of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D61/42
Inventor 汪群慧程桂石何巧力
Owner HARBIN INST OF TECH
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