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Method for adsorbing styrene waste gas by using modified sepiolite

A sepiolite and styrene technology, applied in chemical instruments and methods, silicate, inorganic chemistry, etc., can solve the problems of small channels, poor thermal stability, weak surface acidity, etc., to increase adsorption capacity, improve The sexual process is simple and the effect of good economic benefits

Active Publication Date: 2014-07-30
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country is rich in sepiolite products, accounting for a quarter of the world's reserves, but natural sepiolite mines have low grades, high impurity content, weak surface acidity, small channels, and poor thermal stability. The use of pumice

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The original low-grade sepiolite is mixed with 20 times the mass of water into an autoclave, stirred at 220°C for 3h, filtered with suction, dried at 120°C, and crushed to obtain hydrothermally modified sepiolite. Add the obtained hydrothermally modified sepiolite and 14% hydrochloric acid (volume percentage) into the reaction kettle with a solid-to-liquid mass ratio of 1:2, stirring at 30°C for 2.5 hours, suction filtration, and washing with distilled water until the aqueous solution contains no Magnesium ions. The obtained sample was dried at 120°C to obtain hydrothermal-hydrochloric acid modified sepiolite. The specific surface area of ​​the original sepiolite is 31.256m 2 / g, under this condition, the specific surface area of ​​sepiolite obtained by hydrothermal-hydrochloric acid modification can reach 86.886m 2 / g.

[0024] The dried hydrothermal-hydrochloric acid modified sepiolite is loaded into the adsorption tower, and the malodorous waste gas containing styrene ...

Embodiment 2

[0026] The original low-grade sepiolite is mixed with 5 times the mass of water into an autoclave, stirred at 120°C for 1 hour, filtered with suction, dried at 120°C, and crushed to obtain hydrothermally modified sepiolite. Add the obtained hydrothermally modified sepiolite and 2% hydrochloric acid (volume percentage) into the reaction kettle, with a solid-liquid mass ratio of 1:20, stirring at 30°C for 12 hours, suction filtration, and washing with distilled water until the aqueous solution contains no magnesium ion. The obtained sample was dried at 120°C to obtain hydrothermal-hydrochloric acid modified sepiolite. The specific surface area of ​​the original sepiolite is 25.982m 2 / g, under this condition, the specific surface area of ​​sepiolite modified by hydrothermal-hydrochloric acid can reach 59.297m 2 / g.

[0027] The dried hydrothermal-hydrochloric acid modified sepiolite is loaded into the adsorption tower, and the malodorous waste gas containing styrene is adsorbed at...

Embodiment 3

[0029] The original low-grade sepiolite is mixed with 12 times the mass of water into an autoclave, stirred at 180°C for 3h, filtered with suction, dried at 120°C, and crushed to obtain hydrothermally modified sepiolite. Add the obtained hydrothermally modified sepiolite and 12% hydrochloric acid (volume percentage) into the reaction kettle with a solid-liquid mass ratio of 1:15, stirring at 30°C for 5 hours, suction filtration, and washing with distilled water until the aqueous solution contains no Magnesium ions. The obtained sample was dried at 120°C to obtain hydrothermal / hydrochloric acid modified sepiolite. The specific surface area of ​​the original sepiolite is 43.183m 2 / g, the specific surface area of ​​sepiolite activated under this condition is 100.531m 2 / g.

[0030] The dried hydrothermal / hydrochloric acid modified sepiolite is loaded into the adsorption tower, and the malodorous waste gas containing styrene is adsorbed at 50°C, and its saturated adsorption capacit...

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Abstract

The invention discloses a method for adsorbing styrene waste gas by using modified sepiolite. The method comprises the following steps of: soaking sepiolite with low specific surface area into a certain proportion of water; dipping at constant temperature for a period of time; performing suction-filtration on the solution; drying and crushing a filter cake; soaking into a certain volume of hydrochloric acid for a period of time; performing suction-filtration on the solution; drying and crushing the filter cake to obtain the modified sepiolite; placing the modified sepiolite into an adsorption tower; efficiently adsorbing stink waste gas containing styrene at the temperature of between 0 and 80 DEG C; desorbing the styrene from the modified sepiolite with saturated adsorption in situ at the temperature of between 150 and 350 DEG C; condensing and recovering high-concentration styrene; and regenerating and recycling the sepiolite. The modified sepiolite has high specific surface area, abundant micropores and mesopores and high adsorption performance; the process of adsorbing the styrene-containing stink waste gas by the modified sepiolite is simple, environment-friendly and pollution-free; cost is lower than that of active carbon; the efficiency of adsorbing the styrene is high; recycling, reduction and innocence of the styrene are effectively realized; and remarkable economic and environmental benefits are achieved.

Description

Technical field [0001] The invention belongs to the chemical industry field, and specifically relates to a method for adsorbing styrene waste gas by hydrothermal-hydrochloric acid modified sepiolite. Background technique [0002] Styrene is a benzene compound and is a typical volatile organic pollutant (VOCs). As a monomer, it is widely used in the chemical industry such as synthetic plastics, rubber, latex, and ion exchange resins. It is also used in coatings, pigments, Synthetic medicine, pesticides, and textile industries are important raw materials for organic chemical production and basic chemical products. Styrene has provided convenience for people's lives and also brought worrying environmental problems. Styrene is an aromatic hydrocarbon and is listed as an odor pollutant in the national standard "Emission Standard of Odor Pollutants" (GB-14554-93), and is one of the eight restricted pollutants. The malodorous substances escaping in the air are harmful to humans, ranki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01J20/16B01J20/30
Inventor 段二红郭斌任爱玲杨斌彬
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY