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Preparation method and applications of polyelectrolyte nano particle/NaA molecular sieve composite film capable of being protonated

A polyelectrolyte and nanoparticle technology, which is applied in the field of membrane separation, can solve problems such as separation performance degradation and molecular sieve skeleton collapse, and achieve the effects of improving stability, not easy to peel or swell, and simple preparation

Active Publication Date: 2017-11-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although molecular sieve membrane pervaporation dehydration of organic matter has been industrialized and is gradually replacing organic dehydration membranes; NaA molecular sieve membranes will dissociate Al-O and Si-O bonds under acidic conditions, and NaA + Removed from the framework, resulting in the collapse of the molecular sieve framework and deterioration of separation performance (Peng Xiaozhi, Petrochemical Technology, 2016, 1:60-61)

Method used

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  • Preparation method and applications of polyelectrolyte nano particle/NaA molecular sieve composite film capable of being protonated
  • Preparation method and applications of polyelectrolyte nano particle/NaA molecular sieve composite film capable of being protonated
  • Preparation method and applications of polyelectrolyte nano particle/NaA molecular sieve composite film capable of being protonated

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Experimental program
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Effect test

Embodiment 1

[0031] A preparation condition and method of a protonatable polyelectrolyte nanoparticle / NaA composite film, comprising the steps of:

[0032] (1) Rinse the molecular sieve membrane with a length of about 5 cm with deionized water, soak it in 1 g / L dopamine solution for 12 hours, and then dry it in an oven at 30°C.

[0033] (2) preparation concentration is 0.02wt% sodium polyethylene sulfonate and pH is 4, concentration is the chitosan aqueous solution of 0.02wt%, by the ratio of sulfonate amino anion and cation molar ratio 0.2:1 the two are mixed, through After precipitation, washing and vacuum drying, the protonatable polyelectrolyte nanoparticle material is obtained.

[0034] (3) 0.15 g of protonatable polyelectrolyte nanoparticles was weighed and dissolved in 99.85 g of acetic acid with a volume fraction of 1%, and stirred and dissolved for 8 hours to obtain a solution with a concentration of 0.15 wt%.

[0035] (4) Immerse the molecular sieve membrane in (1) in (3) for 30...

Embodiment 2

[0038] A preparation condition and method of a protonatable polyelectrolyte nanoparticle / NaA composite film, comprising the steps of:

[0039] (1) Rinse the molecular sieve membrane with a length of about 5 cm with deionized water, soak it in 5 g / L dopamine solution for 24 hours, and then dry it in an oven at 40°C.

[0040] (2) preparation concentration is 2wt% sodium polystyrene sulfonate and pH is 8, concentration is the chitosan aqueous solution of 2wt%, by the ratio of sulfonate amino anion and cation molar ratio 0.8:1 the two are mixed, through precipitation , washing, and vacuum drying to obtain protonatable polyelectrolyte nanoparticle materials.

[0041] (3) 1.5 g of protonatable polyelectrolyte nanoparticles was weighed and dissolved in 98.5 g of acetic acid with a volume fraction of 2%, stirred and dissolved rapidly for 64 hours to obtain a solution with a concentration of 1.5 wt%.

[0042] (4) Soak the molecular sieve membrane in (1) in (3) for 1 min, take it out, an...

Embodiment 3

[0045] A preparation condition and method of a protonatable polyelectrolyte nanoparticle / NaA composite film, comprising the steps of:

[0046] (1) Rinse the molecular sieve membrane with a length of about 5 cm with deionized water, soak it in 1 g / L dopamine solution for 24 hours, and then dry it in an oven at 40°C.

[0047] (2) preparation concentration is that the dextran sodium sulfate of 0.02wt% and pH are 6, concentration is the chitosan aqueous solution of 0.02wt%, by the ratio of 0.8:1 molar ratio of sulfate radical amino anion and cation molar ratio both are mixed, through After precipitation, washing and vacuum drying, the protonatable polyelectrolyte nanoparticle material is obtained.

[0048] (3) 1.5 g of protonatable polyelectrolyte nanoparticles was weighed and dissolved in 98.5 g of acetic acid with a volume fraction of 2%, stirred and dissolved rapidly for 48 hours to obtain a solution with a concentration of 1.5 wt%.

[0049] (4) Soak the molecular sieve membra...

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Abstract

The invention discloses a preparation method and applications of a polyelectrolyte nano particle / NaA molecular sieve composite film capable of being protonated, and belongs to the technical field of separation. The preparation method comprises following steps: 1, a NaA molecular sieve base film is treated with dopamine; 2, a cationic polyelectrolyte containing amino groups and an anionic polyelectrolyte containing sulfonic acid groups are subjected to blending so as to obtain polyelectrolyte nano particles capable of being protonated; 3, the polyelectrolyte nano particles capable of being protonated are dissolved in a diluted acid for uniform dispersion so as to obtain a polyelectrolyte nano particle solution of a certain concentration; and 4, NaA molecular sieve film obtained via pretreatment is immersed in a solution of the polyelectrolyte nano particles capable of being protonated, and drying is carried out so as to obtain a compact pervaporation composite film which can be used for dehydration of organic matters under acidic conditions and possesses excellent separation capacity and acid stability.

Description

Technical field: [0001] The invention relates to a method for preparing a polyelectrolyte nanoparticle / NaA molecular sieve composite membrane that can undergo protonation under acidic conditions, and in particular provides a method for preparing a pervaporation composite membrane suitable for dehydration of organic matter under acidic conditions. Membrane separation technology field. Background technique: [0002] With the increasingly severe energy crisis and environmental pollution, the development and application of new energy has become a major global research topic. As a clean and renewable new energy source, biofuel has been gradually applied in transportation, energy, chemical industry and other fields. The traditional distillation purification process is complex, high energy consumption, serious pollution, and when the ethanol concentration reaches 95.6%, it will become an azeotropic solution, affecting further purification. [0003] Pervaporation is a new type of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00B01D65/10
CPCB01D65/10B01D67/0088B01D67/0095B01D69/12B01D2323/46B01D2325/26B01D2325/36
Inventor 安全福李小晴吴家凯王乃鑫李杰纪树兰
Owner BEIJING UNIV OF TECH
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