Thermal cracking resistant zeolite membrane and method of fabricating the same

A production method and separation membrane technology, applied in semipermeable membrane separation, chemical instruments and methods, membranes, etc., can solve problems such as no research and development solutions, and achieve the effects of reducing production costs, reducing thermal cracking, and shortening production time

CN102309928AActive Publication Date: 2012-01-11KOREA INST OF ENERGY RES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-01-11

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Abstract

The present disclosure relates to a thermal cracking resistant zeolite membrane and a method of fabricating the same. The method includes dissolving an alumina-based material, a silica-based material and sodium hydroxide in water to prepare an aqueous solution, stirring the aqueous solution to form a hydrothermal solution, preparing a slurry of zeolite seeds through wet-type vibration pulverization and centrifugal separation of zeolite powder, passing the zeolite seeds through a support by vacuum filtration such that the zeolite seeds can be infiltrated into an inner region of the support ranging from a depth of 3 [mu]m to a depth corresponding to 50% of a total thickness of the support, and immersing the support into the hydrothermal solution for hydrothermal treatment to grow a dense zeolite separation layer not only on the surface of the support but also on the inner region thereof. The zeolite membrane prevents the occurrence of thermal cracking on the zeolite separation layer, thereby providing good thermal stability and separation performance during heating and at a target processing temperature.
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Description

technical field

[0001] The invention relates to a zeolite separation membrane preventing thermal cracking and a manufacturing method thereof, in particular to a technique for preventing thermal cracking of the zeolite separation membrane so that the zeolite separation membrane has stability and excellent separation performance. Background technique

[0002] Zeolite is regularly arranged in the crystal structure with a diameter of ten to tens of Uniform micro-sized (micro) or medium-sized (meso) pores, representative zeolite substances include aluminosilicate (Aluminosilicate).

[0003] Aluminosilicate zeolites are partially SiO 2 Replaced by Al 2 o 3 Substances that also contain substituted Al in order to maintain electrical neutrality 2 o 3 A substance that has twice the number of moles of Na ions.

[0004] For example, NaA zeolite is regularly arranged in a three-dimensional form within a crystal structure with a diameter of 4 Aluminosilicate (Aluminosilicate) min...

Examples

Embodiment 1

[0104] After dissolving water glass (Water Glass), sodium aluminate (Sodium Aluminate), and sodium hydroxide (NaOH) in water to produce an aqueous solution, it stirred at 28 degreeC for 24 hours, and produced the hydrothermal solution. The total volume of the hydrothermal solution is 500ml, the Al in the hydrothermal solution 2 o 3 , SiO 2 、Na 2 O and H 2 The moles of O are 1, 2, 4.5, and 600, respectively.

[0105] Use 20g of water and 90g of alumina balls with a diameter of 1mm to vibrate and pulverize 1g of NaA zeolite powder at a speed of 500cylces / min for 24 hours and centrifuge at a speed of 6000rpm for 10 minutes, then dilute with 200g of water to produce a weight percentage of 0.1 Slurry of custody seed crystals in weight percent. After extracting 4 ml from the prepared stored seed crystal slurry, it was diluted with 150 g of water to prepare a 0.0026% by weight seed crystal. The average particle size of the produced seed crystals is 0.15μm (150nm), please refer ...