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Method for preparing aminopropanol by bipolar membrane electrodialysis

A technology of bipolar membrane electrodialysis and aminopropanol, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxyl compounds, etc., can solve the problems of rising production costs, large steam consumption, high maintenance costs, etc., and achieve product The effect of quality improvement, shortened production cycle, and reduced production cost

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) a large amount of mother liquor needs to be rectified and recovered, and the steam consumption is very large, and each ton of product needs 9 to 12 tons of steam
(2) Ethanol volatilizes greatly and consumes high, resulting in an increase in production costs
(3) A large amount of flammable and toxic ethanol is used, which causes serious pollution to the production environment and increases the safety of production
(4) The concentration of sodium sulfate in the mother liquor is high, the corrosion is strong, the anti-corrosion requirements of the rectification tower are high, the investment is large, and the maintenance cost is high
(5) The by-product sodium sulfate has low purity and low value

Method used

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  • Method for preparing aminopropanol by bipolar membrane electrodialysis
  • Method for preparing aminopropanol by bipolar membrane electrodialysis
  • Method for preparing aminopropanol by bipolar membrane electrodialysis

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Embodiment 1

[0026] The preparation of aminopropanol is carried out by bipolar membrane electrodialysis equipment. The bipolar membrane electrodialysis equipment is composed of two bipolar membrane electrodialysis devices connected in series. The bipolar membrane electrodialysis device consists of two polar liquid chambers on both sides , and an electrodialysis compartment sandwiched between the polar liquid compartments on both sides.

[0027] A bipolar membrane electrodialysis device with a two-compartment structure ( figure 2 As shown), the area of ​​each membrane is 200mm×400mm, a total of 20 bipolar membranes and 20 homogeneous anion exchange membranes are separated to form a membrane stack. The right side is the anode chamber, which constitutes the electrodialysis compartment sandwiched between the cathode chamber and the anode chamber. The electrodialysis compartment is composed of bipolar membranes and anion exchange membranes arranged at intervals to form a feed liquid chamber an...

Embodiment 2

[0031] The preparation of aminopropanol is carried out by bipolar membrane electrodialysis equipment. The bipolar membrane electrodialysis equipment is composed of two bipolar membrane electrodialysis devices connected in series. The bipolar membrane electrodialysis device consists of two polar liquid chambers on both sides , and an electrodialysis compartment sandwiched between the polar liquid compartments on both sides.

[0032] A bipolar membrane electrodialysis device with a three-compartment structure ( image 3 shown), the area of ​​each membrane is 200mm×400mm, a total of 20 bipolar membranes and 80 identical homogeneous anion exchange membranes form a membrane stack, the anode chamber is divided into an anode chamber and a cathode chamber, the left side is The cathode chamber and the anode chamber on the right constitute the electrodialysis compartment sandwiched between the cathode chamber and the anode chamber. The electrodialysis compartment is composed of bipolar ...

Embodiment 3

[0036] The preparation of aminopropanol is carried out by bipolar membrane electrodialysis equipment. The bipolar membrane electrodialysis equipment is composed of two bipolar membrane electrodialysis devices connected in series. The bipolar membrane electrodialysis device consists of two polar liquid chambers on both sides , and an electrodialysis compartment sandwiched between the polar liquid compartments on both sides.

[0037] A three-compartment bipolar membrane electrodialysis device was adopted, and the area of ​​each membrane was 200 mm × 800 mm. A total of 40 bipolar membranes and 40 high-permeability homogeneous anion exchange membranes (JAM-1, Fumatech, Germany) and 40 Zhang high barrier anion exchange membrane (AMW, Tokuyama Co., Ltd., Japan) forms a membrane stack. The anode chamber is divided into an anode chamber and a cathode chamber. The electrodialysis compartment is sandwiched in the middle, and the electrodialysis compartment is composed of bipolar membran...

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Abstract

The invention discloses a method for preparing aminopropanol by bipolar membrane electrodialysis. The method comprises the steps that: aminopropanol sulphate water solution is used as a raw material and enters a material liquid chamber of a bipolar membrane electrodialysis device after being treated by a microporous filter, meanwhile, sulphuric acid water solution with the mass concentration being 0.1 percent is added into an acid chamber, sulphuric acid water solution with the mass concentration being 0.4 percent is added into a pole liquid chamber, the current density of the bipolar membrane electrodialysis device is controlled to be 50 to 800 A / m<2>, the voltage is 20 to 200V, the temperature is 5 to 40 DEG C, an electrodialysis separation chamber carries out circulation cooling through frozen brine in a circulation coil pipe in the operation process, when the electrical conductivity of the material liquid chamber is reduced to 2000mus / cm, the operation is stopped, the material liquid chamber and the acid chamber respectively obtain aminopropanol water solution and sulphuric acid water solution, and the aminopropanol water solution is concentrated to obtain aminopropanol. When the bipolar membrane electrodialysis technology is adopted for preparing the aminopropanol, the production period is short, the aminopropanol recovery rate is high, the energy consumption is obviously reduced, and the sulphuric acid quality is high.

Description

(1) Technical field [0001] The invention relates to a method for preparing aminopropanol, in particular to a method for preparing aminopropanol by using bipolar membrane electrodialysis. (2) Background technology [0002] Aminopropanol is the key intermediate for the synthesis of ofloxacin. Ofloxacin and levofloxacin are the basic medicines in my country. The production cost and quality are very important. The 2-aminopropanol catalytic hydrogenation reaction solution is mainly a sulfate solution containing 2-aminopropanol. To free aminopropanol from the aminopropanol aqueous solution, the traditional separation and purification method is: first distill and concentrate the reaction solution Obtain a concentrated reaction solution, and then use alkali to neutralize the sulfuric acid in the concentrated reaction solution, so as to obtain an aqueous solution of 2-aminopropanol and sodium sulfate, reduce the solubility of sodium sulfate in the aqueous solution by adding ethanol t...

Claims

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Application Information

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IPC IPC(8): C07C215/08C07C213/08B01D61/44
Inventor 沈江南储月霞王利祥阮慧敏
Owner ZHEJIANG UNIV OF TECH
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