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Method for preparing molecular sieve membrane by dip-coating molecular sieve seed crystal method

A technology of molecular sieve and seed crystal method, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of avoiding uneven performance, reducing operation difficulty, and avoiding different performance

Active Publication Date: 2022-04-08
武汉智宏思博环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] This application provides a method for preparing molecular sieve membranes by dip-coating molecular sieve seed crystals to solve the technical problem that molecular sieve membranes prepared by coating crystals need to be coated under high temperature conditions

Method used

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  • Method for preparing molecular sieve membrane by dip-coating molecular sieve seed crystal method
  • Method for preparing molecular sieve membrane by dip-coating molecular sieve seed crystal method
  • Method for preparing molecular sieve membrane by dip-coating molecular sieve seed crystal method

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Embodiment 1

[0076] This embodiment provides a method for preparing molecular sieve membranes by dip-coating molecular sieve seed crystals, such as figure 1 As shown, the method includes the following steps: S10. Obtain the porous carrier after cleaning and baking;

[0077] S20. Dip-coat the seed crystal suspension on the porous carrier, and then dry and solidify to obtain the target porous carrier; specifically include: S1. Seal both ends of the porous carrier and place the seed crystal suspension In the solution, dip coating for 20-180s, and then release the seed crystal suspension immersed in the porous carrier, and dip the porous carrier after dipping; S2. Dry the porous carrier after dipping, and then solidify it to obtain Porous carrier after solidification; S3. Steps S1-S2 are repeated several times to obtain the target porous carrier.

[0078] S30. Place the target porous carrier in the membrane synthesis solution, and carry out crystallization reaction to obtain a molecular sieve...

Embodiment 2

[0087] The embodiment of the present application provides a method for preparing a molecular sieve membrane by dip-coating a molecular sieve seed crystal method, the method comprising the following steps: S11. Obtaining a porous carrier after cleaning, baking and calcining;

[0088] S12. Dip-coat the seed crystal suspension on the porous carrier, and then dry and solidify to obtain the target porous carrier; specifically include: S121. Seal both ends of the porous carrier and place the seed crystal suspension In the solution, dip coating for 20-180s, and then release the seed crystal suspension immersed in the porous carrier, and dip the porous carrier after dipping; S122. Dry the porous carrier after dipping, and then solidify it to obtain Porous carrier after solidification; S123. Steps S121-S122 are repeated multiple times to obtain the target porous carrier.

[0089] S13. Place the target porous carrier in the membrane synthesis solution, and carry out crystallization reac...

Embodiment 3

[0100] The difference between this embodiment and embodiment 2 is:

[0101] (2) Dip-coating seed crystals at room temperature: Take 0.5 g of industrial ZSM-5 molecular sieve seed crystals (purchased from Tianjin University of Technology) with an average particle size of 0.2 μm and a molar ratio of silicon to aluminum of 25, dissolve them in 500 mL of deionized water, and sonicate for 40 minutes Prepare the seed crystal suspension; seal the calcined and cooled carrier tube with a polytetrafluoroethylene plug, immerse in the seed crystal suspension for 150s, remove the polytetrafluoroethylene plug at the mouth of the carrier tube, release the water immersed in the carrier tube, and immediately Bake at 80°C for 3 hours, then turn to 200°C overnight, and calcine and solidify;

[0102] (4) According to the formula Na 2 O:SiO 2 :Al 2 o 3 :H 2 O:NaF=0.21:1:0.039:51.63:1 is mixed with ZSM-5 molecular sieve membrane synthesis liquid;

[0103] (5) Seal the carrier tube introduced ...

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Abstract

The invention belongs to the technical field of molecular sieve membranes, and particularly relates to a method for preparing a molecular sieve membrane by a dip-coating molecular sieve seed crystal method. The method comprises the following steps: obtaining a cleaned, baked and calcined porous carrier; dip-coating the porous carrier with a seed crystal suspension, and then drying and curing to obtain a target porous carrier; the target porous carrier is placed in a membrane synthesis solution for a crystallization reaction, the molecular sieve membrane is obtained, and the membrane synthesis solution in the seed crystal suspension comprises a silicon source, an aluminum source, an alkali source and water. The seed crystal dip-coating can be carried out at normal temperature, so that the problem that the existing high-temperature crystal coating method needs to carry out crystal coating under a high-temperature condition is avoided, and the problem that the molecular sieve membrane prepared by the existing high-temperature crystal coating method is non-uniform in performance is avoided; according to the method, the operation difficulty is reduced, meanwhile, the molecular sieve membrane can be obtained through repeated replication, and the defect that the performance of the molecular sieve membrane is different under repeated coating operation is overcome.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve membranes, in particular to a method for preparing molecular sieve membranes by dip-coating molecular sieve seed crystals. Background technique [0002] Molecular sieve membranes have the advantages of excellent chemical stability, thermal stability, mechanical stability, uniform pore size and fast material transfer, and have been widely used in pervaporation operations in recent years. [0003] Molecular sieve membranes include NaA zeolite membranes, T-type molecular sieve membranes, ZSM-5 molecular sieve membranes, CHA-type molecular sieve membranes, MOR-type molecular sieve membranes, X-type molecular sieve membranes, Y-type molecular sieve membranes and all-silicon membranes. NaA zeolite membrane is highly hydrophilic and has a pore size between water molecules and most organic molecules, making it the most ideal zeolite membrane for pervaporation of organic solvent dehydration operati...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/02B01D69/02
Inventor 周志辉张彩虹
Owner 武汉智宏思博环保科技有限公司
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