Bipolar membrane device for preparing amino-1-propanol

Abstract

The invention discloses a membrane separation technology and particularly relates to a bipolar membrane device for preparing amino-1-propanol. The bipolar membrane device comprises a preprocessing part, a pre-concentrating part and a bipolar membrane part, wherein the preprocessing part is a teflon micro- and ultra-filtration membrane; electrodialysis is performed on the pre-concentrating part through a homogeneous membrane prepared by an impregnation method; the poles of the bipolar membrane part are nickel poles coated with tantalum, platinum and iridium; the bipolar membrane, which are resistant to strong acid and amino-1-propanol, of the bipolar membrane part is a single-plate-method perfluorinated-grafting bipolar membrane, the anode membrane, which is resistant to strong alkali and specially used for stopping alkali, of the bipolar membrane part is a perfluorinated-grafting carboxylic acid anode membrane, and the cathode membrane, which is resistant to strong acid and specially used for stopping acid, of the bipolar membrane part is a cathode membrane adopting a propyl quaternary amine functional group. The bipolar membrane device has the advantages that the overall service life of the device is greatly prolonged by more than 3 years, evaporation energy consumption is reduced greatly, product quality is increased, the material chamber conductivity of a bipolar membrane process is increased greatly, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a bipolar membrane device for preparing aminopropanol. Background technique [0002] L-Aminopropanol is an alcoholic organic compound with amino group, its English name is L-2-amino-1-propanol, and its CAS registration number is 2749-11-3. The molecular formula is C3H9NO, and the linear molecular formula is CH3CH(NH2)CH2OH. It is a colorless or light yellow transparent liquid at room temperature, and its density is 0.965, which is lower than that of water. It can be used in organic synthesis and emulsifiers, and is used in the fields of medicine, pesticides and feed additives, especially the key intermediate for the synthesis of levofloxacin. Due to the definite curative effect and reasonable price of levofloxacin, its consumption is increasing year by year, which also drives the demand for L-2-aminopropanol to increase simultaneously. [0003] At prese...

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 9-12 tons of steam

(2) Ethanol volatilizes greatly and consumes high, resulting in an increase in production costs

(3) Use a large amount of flammable ethanol, resulting in unsafe production

(4) The by-product sodium sulfate has low purity and no economic value, and needs to be treated as waste solid

The consequences of low efficiency, short life, and low acid concentration of the bipolar membrane and negative membrane

[0013] 3) The electrodes used in this patent are ordinary electrodes, not high-performance electrodes resistant to strong acids, which will also cause the electrodes to have a short service life

[0014] 4), in this patent, the bipolar membrane device does not have the function of aminopropanol sulfate for concentration, resulting in the concentration of the prepared aminopropanol being too low, wasting a lot of energy consumption for evaporation and concentration

[0015] Above these shortcomings all can't make this patent can't normal industrialized application

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