NaA molecular sieve membrane element internal membrane preparation method

A molecular sieve and membrane element technology, applied in the field of molecular sieve membrane preparation, can solve the problems of uneven coating and batch difference of molecular sieve membrane, and achieve the effects of high permeation flux, simple method and excellent performance

Active Publication Date: 2013-04-24
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the preparation process of the NaA molecular sieve membrane element in the prior art, it is not easy to co

Method used

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  • NaA molecular sieve membrane element internal membrane preparation method
  • NaA molecular sieve membrane element internal membrane preparation method
  • NaA molecular sieve membrane element internal membrane preparation method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0032] Example 1

[0033] The preparation device of NaA molecular sieve inner membrane provided by the present invention is as follows figure 1 As shown, the preparation steps are as figure 2 Shown.

[0034] Step 1: Preparation of seeded support

[0035] Such as figure 1 As shown, 10g of NaA molecular sieve seeds with an average particle size of about 2μm were weighed, dispersed in 990g of deionized water, and placed in the seed tank 2 on the stirrer 1, after stirring for 10 hours, ultrasonic dispersion for 30 minutes, to obtain NaA type Molecular sieve seed suspension 3, the concentration of the seed suspension is 10g / L; fix the mullite single tube support body 5 with Teflon raw material tape wound on the outer surface of the sealed two ends in the membrane module 4. The end sealing method of the pipe support body is as follows image 3 As shown in the middle shaded part, the end surface of one end of the single tube and the outer wall of the end part are coated with glue or glaze...

Example Embodiment

[0038] Example 2

[0039] Step 1: Preparation of seeded support

[0040] Weigh 10g of NaA molecular sieve seeds with an average particle size of about 2μm, disperse them in 990g of deionized water, stir for 10 hours and then ultrasonically disperse for 30 minutes to obtain a NaA molecular sieve seed suspension with a concentration of 10g / L; A mullite five-channel support (50μm thick) wrapped with polytetrafluoroethylene raw material tape on the sealed outer surfaces of both ends is fixed in the membrane module, and then the NaA molecular sieve suspension is transported to the membrane at a flow rate of 0.5m / s through a diaphragm pump In the inner cavity of the support body 5, the molecular sieve suspension is circulated back to the seed tank. After the circulation time is controlled to 10s, the seed suspension in the inner cavity and the pipeline of the support body is emptied in the opposite direction (with the flow direction of the suspension when the crystal is coated On the co...

Example Embodiment

[0043] Example 3

[0044] Step 1: Preparation of seeded support

[0045] Weigh 100g of NaA molecular sieve seeds with an average particle size of about 10μm, disperse them in 900g of deionized water, stir for 10h, and ultrasonically disperse for 30min to obtain a NaA molecular sieve seed suspension with a concentration of 100g / L; The aluminum oxide four-channel support body wrapped with PTFE raw material tape on the sealed outer surface at both ends is fixed in the membrane module, and then the NaA molecular sieve suspension is transported to the inner cavity of the support body at a flow rate of 0.01 m / s through a slurry pump. The molecular sieve suspension is circulated in the seed tank. After 30 seconds of circulation, the inner cavity of the support and the seed suspension in the pipeline are emptied in the opposite direction, and then the support is taken out and placed in an oven for drying for use.

[0046] Step 2: Preparation of NaA molecular sieve membrane

[0047] Add sodiu...

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Abstract

The invention relates to an NaA molecular sieve internal membrane preparation method and belongs to the technical field of molecular sieve membrane preparation. The method comprises the following steps: 1, uniformly dispersing NaA molecular sieve seeds in deionized water to obtain an NaA molecular sieve seed suspension, conveying the NaA molecular sieve seed suspension to the inner chamber of a support body through a conveying device, allowing the seed suspension to flow on the surface of the inner chamber in a circulation manner, discharging the seed suspension after the circulation ending, and drying the support body to obtain a seeded support body for later use; and 2, placing the seeded support body obtained in step 1 in an NaA molecular sieve membrane preparation liquid, heating for carrying out hydrothermal synthesis to begin a crystallization reaction, taking out after reaction ending, cooling, taking out a molecular sieve membrane tube, washing with deionized water, and drying to obtain an NaA molecular sieve internal membrane. The method solves the non-uniform coating problem during the preparation of the NaA molecular sieve internal membrane, is simple and is easy to implement. The NaA molecular sieve membrane synthesized through utilizing the method has high repeatability and excellent performances.

Description

technical field [0001] The invention relates to a method for preparing an NaA molecular sieve inner membrane, and belongs to the technical field of molecular sieve membrane preparation. In particular, it relates to a method for preparing NaA molecular sieve membrane by cross-flow crystal coating method. Background technique [0002] The application of organic solvent dehydration is common in petrochemical, biomedicine, food and other industries. The separation of azeotropic and near-boiling mixtures of organic matter and water has always been an important task in industrial separation. Traditional separation methods such as azeotropic distillation, extractive distillation, and adsorption not only have the disadvantages of high energy consumption, complex process flow, and low efficiency, but also use a large amount of third-party organic solvents that are harmful to the environment, which will cause environmental pollution, etc. The development of new and efficient solvent ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D67/00C01B39/14C01B39/16
CPCB01D71/028B01D67/0051
Inventor 顾学红杨占照朱月馨纪祖焕庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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