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Preparation method of fly ash-based zeolite molecular sieve for adsorbing VOCs

A technology of zeolite molecular sieve and fly ash, applied in the direction of separation methods, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve the problems of reducing the cost of waste gas treatment, achieve improved hydrophobicity, simple preparation process, and improve silicon-alumina than the effect

Pending Publication Date: 2020-05-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, there have been a large number of reports on the use of fly ash to synthesize zeolite molecular sieves in the adsorption of wastewater in my country, but there are still few studies on the treatment of VOCs, especially the research on the treatment of VOCs by the rotor method has not been reported. If The preparation of fly ash into zeolite molecular sieve with high Si / Al ratio suitable for the treatment of VOCs by the rotary wheel method will greatly reduce the cost of waste gas treatment in my country

Method used

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  • Preparation method of fly ash-based zeolite molecular sieve for adsorbing VOCs
  • Preparation method of fly ash-based zeolite molecular sieve for adsorbing VOCs

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Dry and grind the fly ash until the specific surface area is 320m 2 / kg, then add 2mol / L hydrochloric acid, stir and heat at 100°C for 30min, then suction filter, wash with water, and dry to obtain pretreated fly ash.

[0024] (2) Add the pretreated fly ash obtained in step (1) into the reactor, add 7mL of sodium hydroxide solution (10mol / L) to each 1g of pretreated fly ash, and stir at 70°C by microwave heating Reflux reaction for 30min.

[0025] (3) Pour the solid-liquid mixture obtained in step (2) into a high-pressure reactor for aging for 6 hours to form a stable zeolite molecular sieve crystal nucleus, and then crystallize at 130°C for 5 hours. After the crystallization is completed, suction filter and dry the filter residue , Grinding to obtain the first product of the fly ash-based zeolite molecular sieve, and the adsorption value of the first product to toluene was measured to be 8 mg / g.

[0026] (4) Add 20mL of cetyltrimethylammonium bromide solution (CT...

Embodiment 2

[0028] (1) Dry and grind the fly ash until the specific surface area is 356m 2 / kg, then add 2mol / L hydrochloric acid, stir and heat at 100°C for 40min, then suction filter, wash with water, and dry to obtain pretreated fly ash.

[0029] (2) Add the pretreated fly ash obtained in step (1) into the reactor, add 9mL of sodium hydroxide solution (8mol / L) to each 1g of pretreated fly ash, and stir at 90°C by microwave heating Reflux reaction for 45min.

[0030] (3) Pour the solid-liquid mixture obtained in step (2) into a high-pressure reactor for aging for 4 hours to form a stable zeolite molecular sieve crystal nucleus, and then crystallize at 120°C for 3 hours. After the crystallization is completed, suction filter and dry the filter residue , Grinding to obtain the primary product of the fly ash-based zeolite molecular sieve, the adsorption value of the primary product to toluene was measured to be 7mg / g.

[0031] (4) Add 15mL of cetyltrimethylammonium bromide solution (CTAB...

Embodiment 3

[0033] (1) Dry and grind the fly ash until the specific surface area is 384m 2 / kg, then add 2mol / L hydrochloric acid, stir and heat at 100°C for 60min, then suction filter, wash with water, and dry to obtain pretreated fly ash.

[0034] (2) Add the pretreated fly ash obtained in step (1) into the reactor, add 11mL of sodium hydroxide solution (6mol / L) to each 1g of pretreated fly ash, and stir at 80°C by microwave heating Reflux reaction for 60min.

[0035] (3) Pour the solid-liquid mixture obtained in step (2) into a high-pressure reactor for aging for 8 hours to form a stable zeolite molecular sieve crystal nucleus, and then crystallize at 110°C for 10 hours. After the crystallization is completed, suction filter and dry the filter residue , Grinding to obtain the primary product of the fly ash-based zeolite molecular sieve, and the adsorption value of the primary product to toluene is measured to be 10 mg / g.

[0036] (4) Add 30mL of cetyltrimethylammonium bromide solutio...

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Abstract

The invention provides a preparation method of a fly ash-based zeolite molecular sieve for adsorbing VOCs. The preparation method specifically comprises the following steps: (1) reacting fly ash withhydrochloric acid at 100 DEG C, carrying out suction filtration, performing washing with water, and conducting drying to obtain pretreated fly ash; (2) reacting the pretreated fly ash with a sodium hydroxide solution for 30-60 minutes; (3) aging a reaction solid-liquid mixture for 4-8 hours, crystallizing the mixture at 110-130 DEG C for 3-10 hours, drying filter residues, and grinding the filterresidues to obtain a primary product; and (4) adding 15 mL-30 mL of a CTAB solution into every 1 g of the primary product, performing modifying for 20-40 minutes, and successively performing suction filtration, drying and grinding to obtain the CTAB-modified fly ash-based zeolite molecular sieve. The CTAB-modified fly ash-based zeolite molecular sieve is prepared from fly ash, preparation processis simple, production efficiency is high, fly ash solid waste can be digested, production cost and energy consumption can be reduced, and large-scale production is facilitated.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a method for preparing a zeolite molecular sieve with a high Si / Al ratio for adsorption and treatment of VOCs by a rotary wheel method using fly ash as a raw material. Background technique [0002] For a long time, activated carbon has been used as an adsorbent to treat wastewater and waste gas, but its application is limited due to its high cost. In recent years, zeolite adsorbents have gradually gained favor in the market. However, the mining of natural zeolite destroys the ecological environment, and the cost of further processing is not low. How to solve the cost of purification of exhaust gas at low cost has become a top priority. [0003] As a by-product of thermal power plants, fly ash itself is a kind of polluting solid waste. Random stacking or landfill will pollute the atmosphere and groundwater resources. The main component of fly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J20/18B01D53/02
CPCC01B39/026C01B39/02B01J20/18B01D53/02B01J2220/4812B01J2220/4806B01D2253/108B01D2257/7027B01D2257/708
Inventor 刘东基赵风清田晓华张宇张玉婷郑琪张志国
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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