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A kind of preparation method of acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane

A composite membrane and nanofiltration technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor separation performance of poly(triazine) amine sodium filtration composite membrane, and improve the poor separation performance. , good separation performance, good acid resistance

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a preparation method of an acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane, which can effectively improve the poor separation performance of the poly(triazine)amine sodium filtration composite membrane, and avoid interfacial polymerization of the aqueous phase. The defects of the body limited to linear polyactive amines

Method used

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  • A kind of preparation method of acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane
  • A kind of preparation method of acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane
  • A kind of preparation method of acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0057] 1. Preparation of poly(triazine)amine precursor:

[0058] (1) 17.0 g (91.5 mmol) of 1-(tert-butoxycarbonyl) piperazine was dissolved in 450 mL of tetrahydrofuran (THF), and added to a 1 L three-hole round-bottomed flask, protected by nitrogen, in an ice-water bath. Add 48.1mL (276mmol) of N,N-diisopropylethylamine (DIPEA), dissolve 5.0g (27.1mmol) of cyanuric chloride in 50mL of THF, slowly drop into the round bottom flask, and a white substance is formed . Stir mechanically and react under nitrogen protection for 1 h; warm up to room temperature and continue the reaction for 2 h; finally raise the temperature to 80° C. and stir for 24 h.

[0059] (2) After the reaction, the oil bath was removed, and a white precipitate was formed. The THF solvent was removed by rotary evaporation, and the product was dissolved in 150mL of dichloromethane, then water, saturated NaHSO 4 Extract with NaCl solution. The organic solvent was removed by rotary evaporation to obtain the wh...

Embodiment 2～3

[0068] Directly using the TPT prepared in Example 1, the preparation process of poly(amide-triazine-amine) nanofiltration composite membrane is exactly the same as that in Example 1, the difference is that the concentration of TPT monomer in the aqueous phase reaction solution is respectively Replaced with 0.8% and 1.0%.

Embodiment 4～6

[0070] Directly using the TPT prepared in Example 1, the preparation process of poly(amide-triazine-amine) nanofiltration composite membrane is exactly the same as that in Example 1, the difference is only that the acid receiver Na in the aqueous phase reaction solution is 3 PO 3 .12H 2 O was replaced by equimolar amounts of sodium carbonate, sodium hydroxide and triethylamine, respectively.

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Abstract

The invention discloses a preparation method of an acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane. Firstly, cyanuric chloride and polyamine are used as raw materials, anda nucleophilic substitution reaction is carried out to prepare a poly(triazine) amine precursor; then a poly(triazine) amine precursor aqueous-phase reaction solution and a polyacyl chloride oil phasereaction solution are respectively prepared, and the acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane is prepared on a support membrane through an interfacial polymerization reaction. The invention provides the preparation method of the acid-resistant poly(amide-triazine-amine) nanofiltration composite membrane, so that the problem that the separation performance of a poly(triazine) amine nanofiltration composite membrane is poor can be improved, and the defect that the interfacial polymerization aqueous-phase monomer is limited to linear polynary active amines is avoided. The membrane can be applied to a brine separation system and has good separation performance and good acid resistance.

Description

technical field [0001] The invention relates to the field of preparation of nanofiltration membranes, in particular to a preparation method of acid-resistant poly(amide-triazine-amine) nanofiltration composite membranes. Background technique [0002] Nanofiltration is a nano-scale selective separation process between ultrafiltration and reverse osmosis. It realizes the separation of different types of molecules according to the differences in ion valence and molecular size of solute components. At present, nanofiltration membranes have been widely used in seawater Desalination, purification of drinking water, waste water treatment and classification, purification and concentration of chemical products such as dyes, food and antibiotics. [0003] Most of the traditional polyamide nanofiltration composite membranes use polysulfone ultrafiltration membrane as the support layer, and are prepared by interfacial polymerization of polyamine aqueous phase reaction liquid and polyacy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D61/00B01D71/56B01D67/00
CPCB01D61/027B01D67/0006B01D69/12B01D71/56
Inventor 张林曾艳军
Owner ZHEJIANG UNIV
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