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Method and device for preparation of NaA zeolite membrane

A technology for preparing devices and molecular sieves, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as batch differences of molecular sieve membranes, and achieve the effects of simple method, high permeation flux and excellent performance

Active Publication Date: 2015-11-18
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: the concentration gradient formed by the membrane-forming solution during the preparation process of the NaA molecular sieve membrane in the prior art leads to the problem of batch differences in the performance of the prepared molecular sieve membrane after the membrane is formed

Method used

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  • Method and device for preparation of NaA zeolite membrane
  • Method and device for preparation of NaA zeolite membrane
  • Method and device for preparation of NaA zeolite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1: Preparation of seeded support

[0034] like figure 1As 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 a seed tank on a stirrer, stir for 10 hours and then ultrasonicate for 30 minutes to obtain NaA molecular sieve seeds Suspension, the concentration of the seed crystal suspension is 10g / L; the support fixed on the support bracket is immersed in the seed crystal suspension for 5s, and then the support bracket is taken out, and put into an oven for drying, and set aside.

[0035] Step 2: Preparation of NaA molecular sieve membrane

[0036] Sodium metaaluminate is added to sodium hydroxide and deionized water and fully stirred to form an aluminum solution. After clarification, sodium silicate is added, and after strong stirring, a film-making solution for preparing NaA molecular sieve membranes is formed. Its synthesis solution molar ratio A1 2 o 3 :SiO2 2...

Embodiment 2

[0038] Step 1: Preparation of seeded support

[0039] Concrete method sees embodiment 1

[0040] Step 2: Preparation of NaA molecular sieve membrane

[0041] Sodium metaaluminate is added to sodium hydroxide and deionized water and fully stirred to form an aluminum solution. After clarification, sodium silicate is added, and after strong stirring, a film-making solution for preparing NaA molecular sieve membranes is formed. Its synthesis solution molar ratio A1 2 o 3 :SiO2 2 :Na 2 O:H 2 O=1:2:2:120. Fix the seeded support body vertically on the fixed rotating shaft 7 of the seeded support body, add film-making liquid, cover the upper head 3 of the reaction kettle, and then turn on the support body shaft rotation motor 1 to turn the power supply, so that the support body bracket Turn clockwise (60rpm), then turn on the reactor to rotate the motor 2 to turn the power supply, so that the reactor 6 rotates counterclockwise (60rpm), then turn on the heating device to make th...

Embodiment 3

[0043] Step 1: Preparation of seeded support

[0044] like figure 1 As shown, weigh 10 g of NaA molecular sieve seed crystals with an average particle size of about 1 μm, disperse them in 990 g of deionized water, and place them in the seed crystal tank 2 on the stirrer 1, stir for 10 hours and then ultrasonicate for 30 minutes to obtain NaA molecular sieves Seed suspension, the concentration of the seed suspension is 10g / L; the support fixed on the support bracket is immersed in the seed suspension for 5s, and then the support bracket is taken out, put into an oven for drying, and set aside.

[0045] Step 2: Preparation of NaA molecular sieve membrane

[0046] Add aluminum foil to sodium hydroxide and deionized water and stir fully to form an aluminum solution. After clarification, add sodium silicate and vigorously stir to form a membrane-making solution for preparing NaA molecular sieve membranes. Its synthesis solution molar ratio A1 2 o 3 :SiO2 2 :Na 2 O:H 2 O=1:2:...

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Abstract

The invention relates to a method and a device for preparation of a NaA zeolite membrane, belonging to the technical field of preparation of zeolite membranes. The method comprises the following steps: S1, preparation of a seed-crystal crystallized support: a step of uniformly dispersing NaA zeolite seed crystals into deionized water so as to obtain a NaA zeolite seed-crystal suspension, coating the outer surface of a porous-tube-shaped support with the NaA zeolite seed crystals by utilizing a dipping and pulling method, drying the support so as to obtain the seed-crystal crystallized support for subsequent usage; and S2, preparation of the NaA zeolite membrane: a step of placing the seed-crystal crystallized support obtained in the step S1 in an environment of a membrane-casting solution of the NaA zeolite membrane, starting a reaction kettle to rotate, starting the support to rotate, then carrying out heating for hydro-thermal synthesis and starting crystallization reaction, after the reaction is completed, taking out the support, carrying out cooling, and carrying out washing with deionized water and then carrying out drying so as to obtain the NaA zeolite membrane. The method in the invention solves a problem of concentration gradient existed in the membrane-casting solution during the preparation of the NaA zeolite membrane; and the NaA zeolite membrane synthesized by using the method in the invention has high repeatability and good performances.

Description

technical field [0001] The invention relates to a preparation method and device of a NaA molecular sieve membrane, belonging to the technical field of molecular sieve membrane preparation. In particular, it relates to a method for simultaneously rotating a reactor and a support body, and the invention is also applicable to the preparation of other molecular sieve inner membranes. 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 c...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/02B01D67/00
CPCB01D67/0051B01D71/028
Inventor 顾学红杨占照纪祖焕庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH
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