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A kind of adsorbent for purifying volatile organic waste gas and its preparation method

A volatile organic and adsorbent technology, applied in the field of new adsorbent-modified sepiolite-based molecular sieve and its preparation, can solve the problems of poor formability, low strength, easy cracking of the surface, etc., and achieve good adsorption effect and adsorption capacity High, good processing effect

Active Publication Date: 2019-04-16
SHANGHAI LANBAO ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore size of sepiolite fiber without activation treatment is small, some pores are filled with adsorbed water and zeolite water, and some pores collapse, the channel is narrow, the thermal stability is poor, and there are other impurities, which directly affect its adsorption. It can be directly applied to the purification treatment of industrial organic waste gas
[0004] Therefore, the sepiolite must be activated before use, and acid modification is commonly used. During acid modification, the acid concentration and modification time must be controlled, so that the activated pore size is aimed at the main components of organic waste gas. The sea foam prepared under this condition The pore size of pumice is relatively uniform, and sepiolite has strong adsorption selectivity and strong adsorption to polar molecules, but the composition of industrial waste gas discharged in the industry is relatively complex, except for the main components, there are other organic gases or molecules with weak polarity Therefore, it is necessary to add other gas adsorbents with different pore sizes or weaker selectivity to the acid-modified sepiolite
[0005] At present, making the adsorbent into a honeycomb structure can reduce the resistance loss and facilitate the installation and use of the adsorbent in the equipment. In the common method of preparing honeycomb ceramics, it needs to be roasted at a higher temperature to achieve sufficient strength, but sepiolite Structural water will be lost at 300~800°C, the molecular structure will change, and the adsorption will decrease. Therefore, when preparing honeycomb sepiolite, it must be roasted at a lower temperature, and it should be able to achieve sufficient strength.
However, when honeycomb sepiolite is prepared by the existing preparation method of honeycomb ceramics, the formability is poor, the surface is easy to crack, and the strength is low, which cannot meet the requirements of use.

Method used

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  • A kind of adsorbent for purifying volatile organic waste gas and its preparation method
  • A kind of adsorbent for purifying volatile organic waste gas and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Grind the fibrous α-sepiolite into a powder with a particle size of 325 mesh through a roller mill, put the obtained sepiolite powder into a reaction kettle, add hydrochloric acid with a concentration of 0.2 mol / L, and the mixture of hydrochloric acid and sepiolite powder The liquid-solid ratio was 10 (L / kg), stirred at room temperature for 8 h, filtered, washed, and dried to obtain hydrochloric acid-activated sepiolite.

[0035] In the sepiolite activated by hydrochloric acid, add the aluminum dihydrogen phosphate solution with a mass fraction of 80%, and the silica sol with a mass fraction of 30% and mix evenly. The active ingredient accounts for 100 parts by weight. In the mixture, the aluminum dihydrogen phosphate accounts for 2 parts by weight, silica sol solid matter accounts for 3 parts by weight, polyvinyl butyral accounts for 2 parts by weight, and KH560 accounts for 2 parts by weight. After the mixture was placed in a closed container for 24 hours, it was pres...

Embodiment 2

[0038] Grind the fibrous α-sepiolite into a powder with a particle size of 325 mesh through a roller mill, put the obtained sepiolite powder into a reaction kettle, add hydrochloric acid with a concentration of 0.2 mol / L, and the mixture of hydrochloric acid and sepiolite powder The liquid-solid ratio was 10 (L / kg), stirred at room temperature for 8 h, filtered, washed, and dried to obtain hydrochloric acid-activated sepiolite.

[0039]Add 15% active carbon powder into the hydrochloric acid activated sepiolite, the particle size of the activated carbon powder is 325 mesh, to obtain the mixed raw material.

[0040] In the sepiolite activated by hydrochloric acid, add the aluminum dihydrogen phosphate solution with a mass fraction of 80%, and the silica sol with a mass fraction of 30% and mix evenly. The active ingredient accounts for 100 parts by weight. In the mixture, the aluminum dihydrogen phosphate accounts for 2 parts by weight, silica sol solid matter accounts for 3 part...

Embodiment 3

[0042] The fibrous α-sepiolite was ground into a powder with a particle size of 325 meshes by a roller mill, and the obtained sepiolite powder was placed in a reaction kettle, and hydrochloric acid with a concentration of 0.2 mol / L was added, and the mixture of hydrochloric acid and sepiolite powder was The liquid-solid ratio was 10 (L / kg), stirred at room temperature for 8 hours, filtered, washed, and dried to obtain hydrochloric acid-activated sepiolite.

[0043] A mesoporous zeolite molecular sieve with a mass fraction of 15% was added to the hydrochloric acid-activated sepiolite, and the particle size of the zeolite was 325 mesh to obtain a mixed raw material.

[0044] Add the aluminum dihydrogen phosphate solution with a mass fraction of 80% and the silica sol with a mass fraction of 30% in the mixed raw material and mix evenly. The active ingredient accounts for 100 parts by weight, and the aluminum dihydrogen phosphate in the mixture accounts for 2 parts by weight. , th...

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a novel adsorbent-modified sepiolite base molecular sieve used for purifying volatile organic waste gas and a preparation method and application thereof. Modified sepiolite serves as the base material of the adsorbent and can be used for purifying industrial organic waste gas. The preparation method of the novel volatile organic compound adsorbent provided by the invention includes the steps that the sepiolite is ground into powder particles and then is acid-activated; and an inorganic binder solution is added to be evenly stirred so that a mixture can be obtained, the mixture is aged to be squeezed to be of a granular or honeycomb structure, and the novel volatile organic compound adsorbent can be prepared by means of solidifying and roasting. The novel volatile organic compound adsorbent prepared through the method is used for purifying the industrial organic waste gas, the method for solving the VOCs pollution problem is provided, and meanwhile the rich sepiolite resources in China can be efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a novel adsorbent-modified sepiolite-based molecular sieve for purifying volatile organic waste gas and a preparation method thereof. The adsorbent base material is modified sepiolite, which can be used for Purify industrial organic waste gas. Background technique [0002] The purification and treatment of industrial waste gas containing volatile organic compounds (VOCs) is a hot spot in air pollution control. Among the many methods for purifying industrial organic waste gas, the adsorption method is widely used because of its simple process, convenient operation and high purification efficiency. [0003] Sepiolite is a kind of hydrous magnesium-rich silicate clay mineral. In the fibrous crystal structure of sepiolite, there are many tubular penetrating channels consistent with the direction of fiber extension, which makes sepiolite have a thickness o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30B01D53/02
CPCB01D53/02B01D2257/708B01J20/12
Inventor 许永童
Owner SHANGHAI LANBAO ENVIRONMENTAL PROTECTION TECH CO LTD
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