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Hydrothermal synthesis method of SOD zeolite membrane

A hydrothermal synthesis method and zeolite membrane technology, applied in the direction of sodium zeolite, membrane technology, semi-permeable membrane separation, etc., can solve the problems of restricting the development and utilization of fly ash, slow activity speed, etc., and achieve enhanced mechanical strength and extended use The effect of longevity

Inactive Publication Date: 2015-04-29
DALIAN CITY SHAHEKOU DISTRICT SMALL MEDIUM & MICRO ENTERPRISES SERVICE CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash contains a large amount of aluminosilicate glass, but [SiO4] 4- The degree of polymerization is high, the structure is dense, and the chemical properties are stable. Most of its pozzolanic activity is latent, and the speed of activity is very slow, which greatly limits the development and utilization of fly ash.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The hydrothermal synthesis method of SOD zeolite membrane includes the following steps:

[0019] ① Fly ash pretreatment: roast the fly ash at 800°C for 6 hours, then soak it in a mixed solution of sulfuric acid and nitric acid at a concentration ratio of 3mol / L:1mol / L for 16 hours, dry and grind uniformly;

[0020] ② Crystallization mother liquor: The fly ash prepared in step ① is combined with silica sol, sodium hydroxide, sodium metaaluminate and deionized water according to fly ash: SiO 2 :Al 2 O 3 :NaAlO 2 : H 2 O is 0.5g:40mol:2mol:16mol:500mol and mix well;

[0021] ③ Put the carrier into the crystallization mother liquor at 80℃ for hydrothermal synthesis for 15h; take it out after the reaction is completed, wash it with deionized water, and dry it at 100℃.

[0022] In the hydrothermal synthesis method of SOD zeolite membrane in this embodiment, the carrier is α-Al 2 O 3 tube.

[0023] In the hydrothermal synthesis method of SOD zeolite membrane described in this embodiment...

Embodiment 2

[0025] The hydrothermal synthesis method of SOD zeolite membrane includes the following steps:

[0026] ①Fly ash pretreatment: roast the fly ash at 850°C for 2h, then soak it in a mixed solution of sulfuric acid and nitric acid at a concentration ratio of 3mol / L:1mol / L for 30h, dry and grind uniformly;

[0027] ② Crystallization mother liquor: The fly ash prepared in step ① is combined with silica sol, sodium hydroxide, sodium metaaluminate and deionized water according to fly ash: SiO 2 :Al 2 O 3 :NaAlO 2 : H 2 O is 1.5g:50mol:8mol:28mol:800mol and mix well;

[0028] ③ Put the carrier into the crystallization mother liquor for hydrothermal synthesis at 120°C for 6h; take it out after the reaction is completed, wash it with deionized water, and dry it at 100°C.

[0029] In the hydrothermal synthesis method of SOD zeolite membrane described in this embodiment, the carrier is a mullite tube.

[0030] In the hydrothermal synthesis method of SOD zeolite membrane described in this embodiment...

Embodiment 3

[0032] The hydrothermal synthesis method of SOD zeolite membrane includes the following steps:

[0033] ①Fly ash pretreatment: roast the fly ash at 850℃2, then soak it in a mixed solution of sulfuric acid and nitric acid at a concentration ratio of 3mol / L:1mol / L for 20h, and grind uniformly after drying;

[0034] ② Crystallization mother liquor: the fly ash prepared in step ① is mixed with silica sol, sodium hydroxide, sodium metaaluminate and deionized water according to the ratio of fly ash: SiO 2 :Al 2 O 3 :NaAlO 2 : H 2 O is 1g:40mol:4mol:20mol:800mol.

[0035] ③ Put the carrier into the crystallization mother liquor at 80~120℃ for hydrothermal synthesis for 6~15h; take it out after the reaction is completed, wash it with deionized water, and dry it at 100℃.

[0036] In the hydrothermal synthesis method of SOD zeolite membrane described in this embodiment, the carrier is cordierite.

[0037] In the hydrothermal synthesis method of SOD zeolite membrane described in this embodiment, t...

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Abstract

The invention relates to a hydrothermal synthesis method of an SOD zeolite membrane. The hydrothermal synthesis method comprises the following steps: roasting coal ash at the temperature of 800-850 DEG C for 2-6h, then soaking in a mixed solution of sulfuric acid and nitric acid for 16-30h, and uniformly grinding after drying; uniformly mixing the coal ash with silica solution, sodium hydroxide, sodium metaaluminate and deionized water in a proportion of coal ash, SiO2, Al2O3, NaAlO2 to H2O being (0.5-1.5g):(40-50 mol):(2-8 mol):(16-28 mol):(500-800 mol) to prepare crystallization mother liquid; putting a carrier in the crystallization mother liquid, and carrying out hydrothermal synthesis at the temperature of 80-120 DEG C for 6-15h; taking out after the reaction is completed, washing with deionized water, and drying at the temperature of 100 DEG C.

Description

Technical field [0001] The invention belongs to the technical field of inorganic material permeation separation, and relates to a preparation method of a zeolite molecular sieve membrane, in particular to a hydrothermal synthesis method of an SOD zeolite membrane. Background technique [0002] The cubic unit cell composition of SOD zeolite (sodalite) is Na 6 [Al 6 Si 6 O 24 ], its skeleton structure is composed of [SiO 4 ],[AlO 4 ] Sodalite cage composed of interconnected tetrahedrons. Zeolite molecular sieve membranes are integrated in membrane separation, catalytic separation, functional materials due to their high chemical and thermal stability, high mechanical strength, molecular size pores, exchangeable cations and adjustable solid acid / base properties. There are many application prospects. Separation is an important function of zeolite membranes. The properties of zeolite membranes are hydrophilic (or hydrophobic) depending on the structure and composition. Zeolite membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C01B39/52
Inventor 秦宏佳
Owner DALIAN CITY SHAHEKOU DISTRICT SMALL MEDIUM & MICRO ENTERPRISES SERVICE CENT