Method for preparing reverse osmosis composite membrane containing modified nano-zeolite molecular sieve

A technology of reverse osmosis composite membrane and nano-zeolite, which is applied in the field of reverse osmosis composite membrane preparation, can solve the problems affecting the excellent performance of inorganic particles, the difficulty of controlling particle dispersion, and affecting the performance of composite membranes, so as to avoid the increase of interface defects and improve Separation performance, effect of weakening interface defects

Active Publication Date: 2011-07-06
ZHEJIANG LVLONG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The size of the particles becomes larger after agglomeration, which affects the excellent performance of the inorganic particles themselves. At the same time, due to the uneven dispersion of the agglomerated nanoparticles in the polymer, it also seriously affects the performance of the composite film filled with inorganic particles.
At the same time, unlike the composite membrane prepared by the phase inversion method, the reverse osmosis composite membrane is prepared by interfacial polymerization. The filming time is extremely short, and it is more difficult to control the dispersion of particles in the filming process

Method used

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  • Method for preparing reverse osmosis composite membrane containing modified nano-zeolite molecular sieve
  • Method for preparing reverse osmosis composite membrane containing modified nano-zeolite molecular sieve
  • Method for preparing reverse osmosis composite membrane containing modified nano-zeolite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] To 116ml of toluene, add 0.1g of LTA nano-zeolite molecular sieve with a particle size of 60nm and 0.005g of methyltrimethoxysilane, heat the reaction solution to 100°C, and the modification reaction time is 5h. After the reaction is completed, stop and Cool, filter, and wash with ethanol until no modifying reagent remains in the eluent, and then bake the filter cake in a vacuum oven at 100° C. for 24 hours to prepare a surface-modified LTA nano-zeolite molecular sieve.

[0029] Dispersing the surface-modified LTA-type nano-zeolite molecular sieve prepared into 50ml of n-hexane solution of trimesoyl chloride with a concentration of 0.1% by weight to ensure that the surface-modified LTA-type zeolite by weight concentration is 0.006%, Ultrasound treatment at room temperature for 10 minutes to obtain the mixture; 1g of the polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers was directly immersed in 100ml of m-phenylenediamine aqueous s...

Embodiment 2

[0031] To 58ml of toluene, add 0.075g of LTA nano-zeolite molecular sieve with a particle size of 70nm and 0.005g of propyltrimethoxysilane, heat the reaction solution to 110°C, and the modification reaction time is 10h. After the reaction is completed, stop and After cooling, the obtained product is filtered, washed with ethanol until no modifying reagent remains in the eluent, and then baked in a vacuum oven at 100°C for 24 hours to prepare a surface-modified LTA nano-zeolite molecular sieve.

[0032]Disperse the surface-modified LTA nano-zeolite molecular sieve prepared into 50ml of n-hexane solution with trimesoyl chloride at a concentration of 0.3% by weight to ensure that the surface-modified LTA-type zeolite molecular sieve has a weight percent concentration of 0.012% , sonicated at room temperature for 20 minutes to obtain the mixture; 1g of the polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers was directly immersed in 100ml of m...

Embodiment 3

[0034] To 30ml of toluene, add 0.05g of LTA nano-zeolite molecular sieve with a particle size of 80nm and 0.005g of octyltrimethoxysilane, heat the reaction solution to 120°C, and the modification reaction time is 15h. After the reaction is completed, stop and After cooling, the obtained product is filtered, washed with ethanol until no modifying reagent remains in the eluent, and then baked in a vacuum oven at 100°C for 24 hours to prepare a surface-modified LTA nano-zeolite molecular sieve.

[0035] Dispersing the surface-modified LTA-type nano-zeolite molecular sieve prepared into 50ml of n-hexane solution of trimesoyl chloride with a concentration of 0.5% by weight, ensuring that the surface-modified LTA-type zeolite molecular sieve by weight concentration is 0.025%, Ultrasound treatment at room temperature for 10 minutes to obtain the mixture; 1g of the polysulfone porous ultrafiltration membrane with an average pore diameter of 30 nanometers was directly immersed in 100ml...

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Abstract

The invention discloses a method for preparing a reverse osmosis composite membrane containing a modified nano-zeolite molecular sieve. The method comprises the following steps that silane coupling agent, a nano-zeolite molecular sieve and toluene are mixed for modification reaction, and reactive fluid is filtered, washed and dried after the modification reaction is finished so as to obtain the nano-zeolite molecular sieve, the surface of which is modified; the nano-zeolite molecular sieve with the modified surface is dispersed into polybasic acyl chloride solution so as to obtain mixture; inaddition, a polysulfone support membrane is immersed in water solution of polybasic amine, the membrane is taken out and solvent is removed, the membrane with no solvent and the mixture are subjectedto interfacial polymerization reaction, and the reverse osmosis composite membrane containing the modified nano-zeolite molecular sieve is obtained through subsequent treatment after the interfacial polymerization reaction is finished. The method for preparing the reverse osmosis composite membrane containing the modified nano-zeolite molecular sieve has simple process, and the prepared reverse osmosis composite membrane has good mechanical strength, high salt rejection rate, and high water flux.

Description

technical field [0001] The invention relates to the field of preparation of reverse osmosis membranes, in particular to a preparation method of a reverse osmosis composite membrane containing modified nano-zeolite molecular sieves. Background technique [0002] Reverse osmosis membrane technology has been widely used in the field of seawater desalination. In recent years, with the continuous development of membrane materials and the continuous reduction of the cost of reverse osmosis membrane treatment, this technology has gradually become the most competitive seawater desalination method. The reverse osmosis membrane is the core part of the whole reverse osmosis seawater desalination system, therefore, the high-performance reverse osmosis membrane has always been a research hotspot. In the 1970s, Cadotte and others in the United States first used the interfacial polymerization method to prepare reverse osmosis composite membranes. The composite membrane technology has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/10B01D67/00B01D69/12C02F1/44C02F103/08
Inventor 张林董航瞿新营程丽华陈欢林
Owner ZHEJIANG LVLONG NEW MATERIAL CO LTD
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