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Method for synthetizing NaA type molecular sieve membrane in seed crystal aerosol

A molecular sieve and sol technology, used in chemical instruments and methods, separation/purification of hydroxyl compounds, membrane technology, etc., can solve the problems of low yield and production capacity, difficult supports, etc., and achieve low yield and production capacity. , excellent performance, high repeatability

Active Publication Date: 2014-06-18
JIANGXI CLEANING MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low yield and production capacity in the large-scale production process of the existing NaA molecular sieve membrane, and adopt the method for preparing the NaA molecular sieve membrane synthesized by seed crystal synthetic sol and self-assembled support to overcome the continuous uniformity of the seed crystal For the difficult problem of coating on the support body, a layer of NaA molecular sieve membrane with continuous and excellent separation performance is prepared on the tubular support body

Method used

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  • Method for synthetizing NaA type molecular sieve membrane in seed crystal aerosol
  • Method for synthetizing NaA type molecular sieve membrane in seed crystal aerosol
  • Method for synthetizing NaA type molecular sieve membrane in seed crystal aerosol

Examples

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Effect test

Embodiment 1

[0027] The heterogeneous SOD molecular sieve seed crystals were used to induce the synthesis of nanometer NaA molecular sieve crystals in fluorine-containing sol. Sodium silicate, aluminum hydroxide, sodium hydroxide, sodium fluoride and water are used as raw materials to prepare a composition of 1SiO 2 : 0.5Al 2 o 3 : 1Na 2 O: 40H 2 O: 1NaF sol for crystal seed synthesis, then nano SOD crystals are added in the sol for seed crystal synthesis, the addition is 2% by weight, and this synthetic stoste is at 80 o C hydrothermal synthesis in a water bath shaking condition for 6 days, centrifuged at 8000 rpm for 30 minutes, and washed 4 times to obtain ~30 nm NaA molecular sieve crystals.

[0028] The NaA molecular sieve membrane was synthesized on the porous tubular mullite support by using the seeded sol. Sodium silicate, aluminum hydroxide, sodium hydroxide, sodium fluoride and water are used as raw materials to prepare a composition of 1 SiO 2 : 0.5 Al 2 o 3 : 1 Na 2 O...

Embodiment 2

[0032] The synthetic ratio is the same as that of Preparation Step Example 1. The difference is that the amount of seed crystal added is 3 g seed crystal. The synthesized membrane was cleaned and applied to the pervaporation performance of 10 wt% water / ethanol system at 75 oC, the results are as follows Figure 11 shown.

Embodiment 3

[0034] The synthetic ratio is the same as that of Preparation Step Example 1. The difference is that the amount of seed crystal added is 0.3 g seed crystal. The synthesized membrane was cleaned and applied to the pervaporation performance of 10 wt% water / ethanol system at 75 oC, the results are as follows Figure 11 shown. Figure 5 Surface and cross-sectional microstructures of NaA-type zeolite membranes synthesized on porous mullite tubular supports are shown. The surface of the support body is covered by a few square NaA molecular sieve crystals, which cannot form a continuous molecular sieve film layer.

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Abstract

The invention relates to a preparation method for synthetizing a NaA type molecular sieve membrane in seed crystal aerosol. An out-of-phase SOD (Superoxide Dismutase) type molecular sieve seed crystal is adopted as induction to synthetize a nano NaA type molecular sieve crystal in fluorine-containing aerosol, a support modified by a silane coupling imidazolium cation based ionic liquid ethanol solution is put in synthesis aerosol containing the nano NaA type molecular sieve crystal, and a compact and continuous NaA type molecular sieve crystal layer is formed on the surface of the modified support by adopting a hydrothermal synthesis method. The surface of the prepared NaA type molecular sieve crystal membrane is continuous and compact, the separation performance is good and the repeatability is good, and the method is suitable for being used in large-scale preparation of the NaA type molecular sieve crystal membrane and application of industrial solvent dehydration of the NaA type molecular sieve membrane.

Description

technical field [0001] The invention relates to the preparation of NaA molecular sieve membranes, in particular to a method for synthesizing NaA molecular sieve membranes in a seed sol, and belongs to the field of separation and penetration of inorganic membrane materials. Background technique [0002] Pervaporation is a new type of membrane separation technology process that uses the osmotic pressure difference of the components in the mixture as the driving force, and relies on the different properties of the dissolution and diffusion rates of each component in the membrane to achieve the separation of the mixture. Compared with traditional separation methods such as distillation, adsorption, and extraction, pervaporation technology has the advantages of high efficiency, energy saving, environmental protection, and simple process operation in the separation of liquid mixtures. Compared with traditional azeotropic distillation and extractive distillation, it generally saves...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/10B01D67/00B01D61/36C07C29/76C07C31/08
Inventor 陈祥树张飞胡娜
Owner JIANGXI CLEANING MEMBRANE TECH
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