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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 coat the seed crystal on the inner layer of the support, the coating is uneven, and the performance of the prepared molecular sieve membrane has batch differences. difference problem

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
Effect test

Embodiment 1

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

[0034] Step 1: Preparation of seeded support

[0035] Such as figure 1 As shown, weigh 10 g of NaA molecular sieve seeds with an average particle size of about 2 μm, disperse them in 990 g of deionized water, and place them in the seed tank 2 on the stirrer 1, stir for 10 h and then ultrasonically disperse for 30 min to obtain NaA type Molecular sieve seed crystal suspension 3, the concentration of the seed crystal suspension is 10g / L; the mullite single-tube support body 5 with polytetrafluoroethylene raw material tape wrapped around the outer surface of both ends of the seal is fixed in the membrane module 4, and the single The end sealing method of the tube support body is as follows: image 3 As shown in the shaded part in the middle, the end surface of one end of the single tube and the outer wal...

Embodiment 2

[0039] Step 1: Preparation of seeded support

[0040] Weigh 10 g of NaA molecular sieve seed crystals with an average particle size of about 2 μm, disperse them in 990 g of deionized water, and ultrasonically disperse them for 30 minutes after stirring for 10 hours to obtain a NaA molecular sieve seed crystal suspension, the concentration of which is 10 g / L; The mullite five-channel support body (thickness: 50 μm) wrapped with polytetrafluoroethylene raw material tape on the outer surface of both ends is fixed in the membrane module, and then the NaA molecular sieve suspension is transported to the In the inner cavity of the support body 5, the molecular sieve suspension is circulated back into the seed crystal tank, and after the control cycle time is 10s, the seed crystal suspension in the inner cavity of the support body and the pipeline is emptied in the reverse direction (the direction of flow of the suspension when the crystal is coated) On the contrary), the support bod...

Embodiment 3

[0044] Step 1: Preparation of seeded support

[0045] Weigh 100 g of NaA molecular sieve seed crystals with an average particle size of about 10 μm, disperse them in 900 g of deionized water, and ultrasonically disperse them for 30 minutes after stirring for 10 hours to obtain a NaA molecular sieve seed crystal suspension, the concentration of which is 100 g / L; The aluminum oxide four-channel support body with both ends sealed and wrapped with polytetrafluoroethylene raw material tapes 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 0.01m / s through a slurry pump. In the seed crystal tank where the molecular sieve suspension is circulated, after 30 seconds of circulation, the seed crystal suspension in the inner cavity of the support and the pipeline is emptied in the reverse direction, and then the support is taken out and placed in an oven to dry for later use.

[0046] Step ...

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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
CPCB01D67/0051B01D71/028
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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