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Preparation method of dedusting and denitration multifunctional composite filter material

A composite filter material, multi-functional technology, applied in separation methods, chemical instruments and methods, dispersed particle filtration, etc., can solve the problems of not easy operation, uneven loading of catalytic particles, easy powdering and falling off of catalysts, etc. The effect of reducing shedding, improving removal ability and universality

Active Publication Date: 2021-08-27
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These denitrification filter materials have the problems of uneven loading of catalytic particles, uneasy operation, and easy powdering and falling off of catalysts.

Method used

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  • Preparation method of dedusting and denitration multifunctional composite filter material
  • Preparation method of dedusting and denitration multifunctional composite filter material
  • Preparation method of dedusting and denitration multifunctional composite filter material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Preparation of breathable base film.

[0041] The first step, first weigh 60g (6%) of lubricant oxidized polyethylene wax, 40g (4%) of pore aid kerosene, 50g (5%) of auxiliary agent, modifier vinyl tris (β-methoxyethylene) Oxygen) silane 20g (2%), polytetrafluoroethylene powder 830g (83%), the mass ratio of ammonia water and hydrogen peroxide in the auxiliary agent is 1:0.1.

[0042] In the second step, the weighed powder is put into an ultrasonic stirrer for mixing and stirring, and the stirring speed is 140 rpm. The stirring time is 500 minutes, and after taking it out, let it stand at 25° C. for 50 hours to obtain a gas-permeable membrane blank.

[0043]In the third step, the breathable base film blank is extruded into a strip-shaped preform through the pre-extrusion step, and then the preform is calendered at a temperature of 130°C, a pressure of 5Mpa, and a processing speed of 1m / min. The formed body is biaxially stretched in the first direction and in the sec...

Embodiment 2

[0064] 1. Preparation of breathable base film.

[0065] The first step, at first take by weighing lubricant n-butyl stearate 240g (24%), pore aid ethanol 70g (7%), auxiliary agent 100g (10%), modifier polyvinyl chloride 80g (8%) , polytetrafluoroethylene powder 510g (51%), the mass ratio of ammoniacal liquor and hydrogen peroxide in the auxiliary agent is 1:0.5.

[0066] In the second step, the weighed powder is put into an ultrasonic stirrer for mixing and stirring, and the stirring speed is 780 rpm. The stirring time is 100 minutes, and after taking it out, let it stand at 75° C. for 22 hours to obtain a gas-permeable membrane blank.

[0067] In the third step, the breathable base film blank is extruded into a strip-shaped preform through the pre-extrusion step, and then the preform is calendered at a temperature of 250°C, a pressure of 10Mpa, and a processing speed of 1.5m / min. The preform is stretched biaxially in the first direction and in the second direction perpendic...

Embodiment 3

[0080] 1. Preparation of breathable base film.

[0081] The first step, at first take by weighing lubricant oxidized polyethylene wax 110g (11%), pore aid polyethylene glycol 40050g (5%), auxiliary agent 70g (7%), modifying agent polyvinylidene chloride 20g (2 %), polytetrafluoroethylene powder 750g (75%), the mass ratio of ammoniacal liquor and hydrogen peroxide in the auxiliary agent is 1:0.3.

[0082] In the second step, the weighed powder is put into an ultrasonic stirrer for mixing and stirring, and the stirring speed is 1200 rpm. The stirring time is 30 minutes, and after taking it out, let it stand at 85° C. for 8 hours to obtain a gas-permeable membrane blank.

[0083] In the third step, the breathable base film blank is extruded into a strip-shaped preform through the pre-extrusion step, and then the preform is calendered under the conditions of a temperature of 290°C, a pressure of 2Mpa, and a processing speed of 3m / min. The formed body is biaxially stretched in th...

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Abstract

The invention discloses a preparation method of a dedusting and denitration multifunctional composite filter material, which comprises the following steps: loading a composite transition metal oxide catalyst to the surface of a breathable base membrane by adopting a molecular self-assembly mode to prepare a catalytic filter membrane, and carrying out hot-pressing compounding on the catalytic filter membrane and filter material base cloth to prepare the dedusting and denitration multifunctional composite filter material, wherein an active molecule assembly solution adopted by the molecule self-assembly contains an active component precursor and a functional component precursor, and the mass ratios of the active component precursor and the functional component precursor in the active molecule assembly solution are respectively 5-38% and 0.01-25%. According to the invention, efficient coupling of active components on the filter membrane is realized through molecular self-assembly, and the problem of pulverization and falling of catalytic components can be effectively solved.

Description

technical field [0001] The invention relates to the technical field of material processing and catalytic materials, in particular to a method for preparing a dust-removing and denitrifying multifunctional composite filter material. Background technique [0002] Nitrogen oxides (NO x ) is one of the important causes of smog and acid rain. The cement industry is the largest NO emitter after the thermal power industry. In recent years, the country has paid more and more attention to the pollution problems of flue gas emissions from industries such as cement and steel, especially PM2.5 and NO x emissions. At present, selective noncatalytic reduction (SNCR) technology is often used in cement kilns to denitrify, and NO x The removal rate is not high, the consumption and leakage of liquid ammonia are large, and it is easy to cause defects such as secondary pollution; while the selective catalytic reduction (SCR) denitrification method has the characteristics of large flue gas t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00B01D53/86B01D53/56
CPCB01D46/0001B01D46/0027B01D53/8628B01D2255/40
Inventor 杨波倪茂森顾秋香黄琼
Owner NANJING UNIV OF INFORMATION SCI & TECH