Method for preparing NaA molecular sieve membrane through induction of nanocrystal seeds

A technology of nano-crystal seeds and molecular sieves, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as failure to change the crystallization time, changing the size and surface structure properties of molecular sieve crystals, and complicated operations , to achieve the effects of reduced membrane production cost, high repeatability, and high permeation flux

Inactive Publication Date: 2011-11-23
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This seed crystal treatment method better disperses the agglomerated seeds, but cannot substantially change the molecular sieve seed crystal size and surface structural properties
Although the separation performance of the as-synthesized membrane was improved, the crystallization time did not change
At the same time, the method is complicated to operate and is not suitable for large-scale production of NaA molecular sieve membranes.

Method used

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  • Method for preparing NaA molecular sieve membrane through induction of nanocrystal seeds
  • Method for preparing NaA molecular sieve membrane through induction of nanocrystal seeds
  • Method for preparing NaA molecular sieve membrane through induction of nanocrystal seeds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Preparation of Nanoparticle Seed Crystals

[0026] A high-energy ball mill was used to mill the seed crystals with an average particle size of 3.34 μm at a speed of 450 rpm, a treatment time of 3 h, and a ball-to-material mass ratio of 100:1. Obtaining the random morphology nanoparticle crystal seed that the average particle size is 300nm, its XRD diffraction pattern, SEM photo and TEM photo are shown in Fig. (1) (a), (c), (d) respectively, from the figure It can be seen that the seed crystals after ball milling have an irregular shape.

[0027] Step 2: Preparation of seed suspension

[0028] Weigh 0.1 g of nanoparticle seed crystals and place them in 50 ml of deionized water, stir, and ultrasonically disperse them evenly. The processed tubular alumina carrier is pre-coated with seed crystals by dipping and crystal coating method, and the carrier stays in the suspension for 5s.

[0029] Step 3: Preparation of NaA molecular sieve membrane

[0030] Add a certain...

Embodiment 2

[0032] Step 1: Preparation of Nanoparticle Seed Crystals

[0033] A high-energy ball mill was used to mill the seed crystals with an average particle size of 2.8 μm at a speed of 250 rpm, a treatment time of 2 h, and a ball-to-material ratio of 50:1. The random shape nanoparticle seed crystal with an average particle size of 500nm was obtained.

[0034] Then step 2, step 3 are the same as embodiment 1

Embodiment 3

[0036] Step 1: The preparation of nanoparticle seed crystals is the same as in Example 1

[0037] Step 2: Weigh 0.5 g of nanoparticle seed crystals and place them in 50 ml of deionized water, stir, and ultrasonically disperse them evenly. The treated carrier is pre-coated with seed crystals by dipping and crystal coating method, and the carrier stays in the suspension for 5s.

[0038] Step 3 is the same as embodiment 1

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Abstract

The invention relates to a method for preparing a NaA molecular sieve membrane through the induction of nanocrystal seeds, which comprises the following steps of: crushing NaA molecular sieve particles with a large size by using a ball mill to obtain nano-scale molecular sieve particles serving as the crystal seeds; and coating a crystal seed layer on the surface of a carrier, and preparing the NaA molecular sieve membrane by a hydrothermal synthesis method through induction. The NaA molecular sieve membrane synthesized by the method has high separating property, penetration flux and membrane formation repeatability, and a short synthesis period, and is suitable for mass scale-up production.

Description

Technical field: [0001] The technology relates to a method for quickly preparing NaA molecular sieve membranes, in particular to a method for obtaining nano crystal seeds by using a mechanical crushing method, and then using nano crystal seeds to induce and prepare NaA molecular sieve membranes. Background technique: [0002] Pervaporation technology is a new type of membrane separation technology and clean production technology. Due to its advantages of high separation efficiency, low energy consumption, and environmental protection, it has been favored by researchers and enterprises in recent years. This technology is especially suitable for near-boiling point, azeotropic mixtures and isomer systems that are difficult to separate or cannot be separated by rectification. It has obvious technical and economical advantages for the removal of trace water in organic solvents and organic mixed solvents. It can also be coupled with biological and chemical reactions (for example: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D71/028B01D67/0051
Inventor 顾学红杨占照刘艳梅邢卫红徐南平
Owner NANJING UNIV OF TECH
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