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Preparation method of AlPO-18 molecular sieve membrane

A technology of alpo-18 and molecular sieve, which is applied in the direction of molecular sieve characteristic aluminum phosphate, molecular sieve and alkali-exchanged phosphate, phosphorus compound, etc., can solve problems such as no patent reports and achieve high repeatability

Inactive Publication Date: 2013-12-18
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is no patent report on the synthesis of AlPO-18 molecular sieve membrane with AEI structure

Method used

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  • Preparation method of AlPO-18 molecular sieve membrane
  • Preparation method of AlPO-18 molecular sieve membrane
  • Preparation method of AlPO-18 molecular sieve membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step (1): Mix 49.19g of tetraethylammonium hydroxide solution (TEAOH, 35wt%) with 27.94g of deionized water, weigh 7.71g of aluminum isopropoxide into the solution, and stir at room temperature for 2-3 hours; Then slowly add 13.48g of phosphoric acid solution (H 3 PO 4 , 85wt%), stirred overnight. The hydrothermal synthesis was carried out in an oven, and the hydrothermal synthesis was carried out at 150° C. for 8 hours. After the product is taken out, it is washed with deionized water, centrifuged, and dried to obtain AlPO-18 molecular sieve seed crystals.

[0031] The scanning electron micrograph of this AlPO-18 molecular sieve seed crystal, as figure 1 As shown, the AlPO-18 molecular sieve seed crystals are about 200nm rod-shaped crystals, and the size and shape are very uniform.

[0032] In addition, the XRD patterns of AlPO-18 molecular sieve seeds are as follows: figure 2 shown, consistent with the standard spectrum.

[0033] Step (2): Select a porous alumi...

Embodiment 2

[0042] The difference from Example 1 is that the aluminum source used in the synthesis mother liquor of molecular sieve membrane is Al(OH) 3 , rather than aluminum isopropoxide. All the other are with embodiment 1. CO 2 / CH 4 The gas separation test is the same as Example 1. The results obtained are shown in Table 2. CO 2 / CH 4 The separation selectivity of mixed gas is 41, CO 2 Permeability 2.0×10 -7 mol / (m 2 ·s·Pa).

[0043] Table 2 CO of Example 2 2 / CH 4 Gas Separation Test Results

[0044]

[0045] Note: The pressure difference between the feed side and the permeate side of the membrane tube is 140kPa

Embodiment 3

[0047] The difference from Example 1 is that the hydrothermal crystallization temperature of the molecular sieve membrane is 180° C., and the crystallization time is 24 hours. All the other are the same as example 1. CO 2 / CH 4 The gas separation test is the same as Example 1. The results obtained are shown in Table 3. CO 2 / CH 4 The separation selectivity of mixed gas is 33, CO 2 Permeability 3.2×10 -7 mol / (m 2 ·s·Pa).

[0048] Table 3 CO of Example 3 2 / CH 4 Gas Separation Test Results

[0049]

[0050] Note: The pressure difference between the feed side and the permeate side of the membrane tube is 140kPa

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Abstract

The invention discloses a preparation method of an AlPO-18 molecular sieve membrane. The preparation method comprises following steps: (1) mixing and dissolving aluminum source, tetraethylammonium hydroxide, and phosphoric acid in water, then carrying out hydro-thermal synthesis reactions to obtain AlPO-18 molecular sieve crystal seed; (2) coating the AlPO-18 molecular sieve crystal seed on the inner surface of a porous ceramic tube carrier; (3) mixing and dissolving aluminum source, tetraethylammonium hydroxide, and phosphoric acid in water to obtain molecular sieve membrane synthesis mother liquid, putting the ceramic tube, which has been coated with the AlPO-18 molecular sieve crystal seed, in a reactor, adding the molecular sieve membrane synthesis mother liquid, and then carrying out a hydrothermal crystallization treatment so as to obtain an AlPO-18 molecular sieve membrane after aging; (4) burning the membrane tube to remove the template agent so as to obtain an activated AlPO-18 molecular sieve membrane. The AlPO-18 molecular sieve membrane synthesized by the preparation method is capable of being applied to separations of CO2 / CH4 and CO2 / H2, and has a high selectivity and a high throughput of separations of CO2 / CH4 and CO2 / H2.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve membrane, in particular to a preparation method of an AlPO-18 molecular sieve membrane. Background technique [0002] Natural gas is an important energy and chemical raw material alongside petroleum and coal. The global annual consumption of natural gas is nearly 3 trillion cubic meters per year, accounting for 23.7% of the total energy demand. Natural gas usually contains some impurities, such as water, carbon dioxide, nitrogen, hydrogen sulfide, etc. All natural gas is treated to varying degrees in order to meet pipeline requirements. Natural gas purification is currently the largest industrial gas treatment process, the global market is about 5 billion US dollars per year, mainly to remove CO from natural gas 2 . According to statistics, more than 20% of the natural gas in the United States is due to excessive CO 2 Content requires advanced processing. CO in Shell's gas fields i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/04B82Y40/00
Inventor 孙予罕张延风李猛
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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