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Method for separating methoxamine from distillation liquid by using electrodialysis

A technology of methoxyamine and electrodialysis, applied in the direction of electrodialysis, etc., can solve the problems of high energy consumption and low quality of methoxyamine separation, achieve the effects of reducing energy consumption, reducing environmental pollution, and improving product purity

Active Publication Date: 2014-08-20
ZHEJIANG CIRCLE TECH MEMBRANE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a new method for separating methoxyamine and ammonia water from methoxyamine extraction solution by electrodialysis, which is characterized in that bipolar membranes, anion exchange membranes and cation exchange membranes are used, and through different specific arrangements, Constitute an electrodialysis device to separate methoxyamine and ammonia water from the methoxyamine extraction liquid, so as to solve the problems of high energy consumption and low quality of methoxyamine separation, realize clean production and improve competitiveness

Method used

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  • Method for separating methoxamine from distillation liquid by using electrodialysis
  • Method for separating methoxamine from distillation liquid by using electrodialysis
  • Method for separating methoxamine from distillation liquid by using electrodialysis

Examples

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Effect test

Embodiment 1

[0017] Take 0.5L of the methoxyamine extraction solution after microporous filtration, containing 9.42% of methoxyamine and 1% of ammonia, and pump it into five groups of 9*21cm two-compartment bipolar membrane electrodialysis membrane stacks for salt chamber, pump 0.5L pure water into the alkali chamber, pump 0.5L sodium sulfate with a concentration of 3% into the electrode solution chamber, seal all compartments, and circulate at a flow rate of 25L / h, connect the DC power line to the membrane stack Turn on the positive and negative poles of the DC power supply, keep the temperature at 25°C, and control the current density to 50A / m 2 , stop when the conductance of the alkali chamber rises to 5.5ms / cm, and react for 2 hours. The content of methoxyamine obtained in the salt room was 9.14%, the ammonia was trace, and the recovery rate reached 97%, and the ammonia content in the alkali room was 0.96%. Example 2

Embodiment 2

[0018] Take 0.5L of the methoxyamine extraction solution after microporous filtration, containing 9.42% of methoxyamine and 1% of ammonia, and pump it into five groups of 9*21cm two-compartment bipolar membrane electrodialysis membrane stacks for salt room, add a small amount of hydrochloric acid, pump 0.5L pure water into the alkali room, pump 0.5L sodium sulfate with a concentration of 3% into the electrode solution room, seal all compartments, and circulate at a flow rate of 25L / h, and connect the DC power line Connect to the positive and negative poles of the membrane stack, turn on the DC power supply, keep the temperature at 25°C, and control the current density to 50A / m 2 , stop when the conductance of the alkali chamber rises to 5.5ms / cm, and the reaction lasts for 1.8h. The content of methoxyamine obtained in the salt chamber is 9.02%, the ammonia is trace, the recovery rate reaches 95.8%, and the ammonia content in the alkali chamber is 0.95%.

Embodiment 3

[0020] Take 0.5L of the methoxyamine extraction solution after microporous filtration, adjust the pH to 5.5, containing 9.42% of methoxyamine and 1% of ammonia, and pump it into 5 groups of 9*11cm two-compartment electrodialysis membrane stacks Dilute chamber, pump 0.5L pure water into the concentrated chamber, pump 0.5L sodium sulfate with a concentration of 3% into the electrode solution chamber, seal all compartments, and circulate at a flow rate of 25L / h, connect the DC power line to the membrane For the positive and negative electrodes of the stack, turn on the DC power supply, keep the temperature at 25°C, and control the current density to 100A / m 2 , Stop when the conductance of the feed solution drops to 0.5ms / cm, and react for 2 hours. The content of methoxyamine obtained in the thin chamber is 8.98%, the amount of ammonia is trace, the recovery rate reaches 95.3%, and the content of ammonium chloride in the thick chamber is 2.99%.

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Abstract

The invention discloses a method for separating methoxamine from distillation liquid by using electrodialysis. The method comprises the following specific processes: filtering methoxamine distillation liquid by using micro-pores; pumping a solution into one of a salt chamber or a salt / fresh water chamber of a bipolar membrane electrodialysis device; injecting an electrolyte solution with a certain concentration into other compartment chambers; respectively connecting a cathode and an anode of the device with the negative electrode and the positive electrode of a direct-current power supply; starting the bipolar membrane electrodialysis device; controlling the current density of the direct-current electric field of the membrane electrodialysis device to be 10 to 150 A / m<2>, and the temperature to be 5 to 30 DEG C, thereby obtaining the methoxamine solution in an acid chamber, wherein the recovery rate reaches over 95 percent, and the current efficiency reaches about 70 percent. The method has the advantages of high yield, low energy consumption and no pollution, and has a good application prospect.

Description

Technical field [0001] The invention relates to a new process for separating methoxyamine and ammonia by electrodialysis of methoxyamine extraction solution. It is characterized by using bipolar membranes, anion exchange membranes and cation exchange membranes to form electrodialysis through different specific arrangements. The device is used to separate methoxyamine and ammonia water from the methoxyamine extract liquid, which involves the process and operating parameters of using electrodialysis to separate methoxyamine and ammonia water. Background technique [0002] Methoxyamine hydrochloride is an important chemical product and intermediate, which can be used in the development and printing of color photos and films, and is widely used in the synthesis of functional materials, low-toxic pesticides, new herbicides and medicines. In medicine, methoxyamine hydrochloride is mainly used in the synthesis of second-generation cefuroxime, as well as in the synthesis of sulfamet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/48
Inventor 沈江南王利祥叶云飞余杰黄杰李健
Owner ZHEJIANG CIRCLE TECH MEMBRANE TECH
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