Method for synthesizing NaA zeolite membrane with high membrane forming efficiency

A zeolite membrane and membrane-forming technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing the separation performance of synthetic membranes, unable to completely eliminate pore defects on the carrier surface, and achieve high membrane-forming rate Effect

Active Publication Date: 2014-02-26
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quality of seed crystal coating is directly related to the film formation rate. Neither hot dipping method nor vacuum method can completely el

Method used

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  • Method for synthesizing NaA zeolite membrane with high membrane forming efficiency
  • Method for synthesizing NaA zeolite membrane with high membrane forming efficiency
  • Method for synthesizing NaA zeolite membrane with high membrane forming efficiency

Examples

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Example Embodiment

[0036] Example 1

[0037] A method for preparing NaA zeolite membrane by vacuum filtration of seed crystals. The preparation steps are as follows:

[0038] 1. Take α-Al 2 O 3 The outer surface of the carrier tube is smoothed with 1200# sandpaper successively, and then the polished α-Al 2 O 3 The carrier tube was immersed in 0.1 mol / L hydrochloric acid solution and 0.1 mol / L sodium hydroxide solution successively, and ultrasonically vibrated for 0.5 hours respectively. After taking it out, it was washed with deionized water until it became neutral, and it was dried in an oven at 50°C for 16 hours. Calcined in a Furnace at 200°C for 2h, and take it out for later use.

[0039] 2. Use NaA molecular sieve seed crystals and deionized water to prepare a 0.1g / L seed crystal aqueous solution, and use ultrasonic dispersion for the obtained solution for 2 hours, and then stand for 12 hours. stand-by.

[0040] 3. Seal both ends of the carrier tube with polytetrafluoroethylene. Heat it at 150°C...

Example Embodiment

[0044] Example 2

[0045] A method for preparing NaA zeolite membrane by vacuum filtration of seed crystals. The preparation steps are as follows:

[0046] 1. Take α-Al 2 O 3 The outer surface of the carrier tube is smoothed with 1200# sandpaper successively, and then the polished α-Al 2 O 3 The carrier tube was immersed in 0.8 mol / L hydrochloric acid solution and 0.8 mol / L sodium hydroxide solution successively, ultrasonically vibrated for 1 hour respectively, and washed with deionized water to neutrality after being taken out, and dried in an oven at 80°C for 20 hours. The furnace was calcined at 280°C for 3h, and then taken out for use.

[0047] 2. Use NaA molecular sieve seed crystals and deionized water to prepare a 0.5g / L seed crystal aqueous solution, and use ultrasonic dispersion for the obtained solution for 4 hours, and then stand for 18 hours. stand-by.

[0048] 3. Seal both ends of the carrier tube with polytetrafluoroethylene. Heat it at 170°C for 3h, take it out and q...

Example Embodiment

[0052] Embodiment 3

[0053] A method for preparing NaA zeolite membrane by vacuum filtration of seed crystals. The preparation steps are as follows:

[0054] 1. Take α-Al 2 O 3 The outer surface of the carrier tube is smoothed with 1200# sandpaper successively, and then the polished α-Al 2 O 3 The carrier tube was immersed in 0.8mol / L hydrochloric acid solution and 0.8mol / L sodium hydroxide solution successively, ultrasonically vibrated for 1h respectively, and then washed with deionized water to neutrality after being taken out, dried in an oven at 90℃ for 24h, and then in the muffle The furnace was calcined at 350°C for 4h, and then taken out for use.

[0055] 2. Use NaA molecular sieve seed crystals and deionized water to prepare 0.8 g / L seed crystal aqueous solution, and the obtained solution is dispersed by ultrasonic for 5 hours, and then left to stand for 20 hours. stand-by.

[0056] 3. Seal both ends of the carrier tube with polytetrafluoroethylene. Heat it at 200°C for 3h...

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Abstract

The invention provides a method for synthesizing a NaA zeolite membrane with high membrane forming efficiency. The method is characterized by comprising the following steps: coating nano NaA molecular sieve crystal seeds by a thermal impregnation method, wiping the crystal seed layer of the surface of a carrier under an evacuated condition to ensure that the thickness of the crystal seed layer is uniform and the crystal seeds are coated evenly and continuously, and synthesizing for 2-6h at 80-100 DEG C by hydrothermal crystallization, so as to prepare the NaA zeolite membrane with high pass and preferable separation effect; due to the adoption of the method, the problems that the crystals are coated for several times, repeated hydrothermal synthesizes are required and the membrane forming efficiency is low when preparing the NaA membrane in the prior art are solved mainly.

Description

technical field [0001] The invention belongs to the technical field of permeation and separation of inorganic materials, and relates to a method for synthesizing NaA zeolite membranes with a high film-forming rate, in particular to coating seed crystals on an α-Al2O3 carrier by hot dipping and vacuum pumping, with a high film-forming rate A method for synthesizing a continuous, uniform, dense NaA zeolite membrane with excellent separation performance. Background technique [0002] Compared with the separation technology in traditional industry, membrane separation technology has the advantages of low energy consumption, less pollution, easy coupling with other separation processes, mild operating conditions, and easy scale-up, etc., and has been widely used in many industrial fields. The development of inorganic membrane started relatively late, and it is a kind of solid membrane. It is a semipermeable membrane made of inorganic materials, such as metals, metal oxides, ceram...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D67/00
Inventor 陈赞于海斌胡毅臧毅华郑秋红季超刘宗园
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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