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Novel adsorbent used for purifying volatile organic waste gas

A technology of volatile organic and volatile organic compounds, which is applied in the field of new adsorbent-modified sepiolite-based molecular sieve and its preparation, can solve the problems of reduced adsorption, poor formability, and easy cracking of the surface, and achieve fast adsorption speed, Good adsorption effect, good treatment effect

Active Publication Date: 2017-04-05
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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Examples

Experimental program
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Effect test

Embodiment 1

[0034] The fibrous α-sepiolite is pulverized into powder with a particle size of 325 mesh by roller milling, and the obtained sepiolite powder is placed in a reaction kettle, and hydrochloric acid with a concentration of 0.2mol / L is added. The liquid-solid ratio is 10 (L / kg), the mixture is stirred at room temperature for 8 hours, filtered, washed, and dried to obtain hydrochloric acid activated sepiolite.

[0035] Add 80% by mass aluminum dihydrogen phosphate solution and 30% by mass silica sol to sepiolite activated by hydrochloric acid and mix uniformly. The active ingredient accounts for 100 parts by weight, and the mixture contains aluminum dihydrogen phosphate. 2 parts by weight, 3 parts by weight of silica sol solids, 2 parts by weight of polyvinyl butyral, and 2 parts by weight of KH560. After the mixture was placed in a closed container for 24 hours, it was pressed into a honeycomb structure blank in a mold, cured at 110°C for a curing time of 12 hours, and then placed i...

Embodiment 2

[0038] The fibrous α-sepiolite is pulverized into powder with a particle size of 325 mesh by roller milling, and the obtained sepiolite powder is placed in a reaction kettle, and hydrochloric acid with a concentration of 0.2mol / L is added. The liquid-solid ratio is 10 (L / kg), the mixture is stirred at room temperature for 8 hours, filtered, washed, and dried to obtain hydrochloric acid activated sepiolite.

[0039] The activated carbon powder with a mass fraction of 15% is added to the hydrochloric acid activated sepiolite, and the particle size of the activated carbon powder is 325 mesh to obtain a mixed raw material.

[0040] Add 80% by mass aluminum dihydrogen phosphate solution and 30% by mass silica sol to sepiolite activated by hydrochloric acid and mix uniformly. The active ingredient accounts for 100 parts by weight, and the mixture contains aluminum dihydrogen phosphate. 2 parts by weight, 3 parts by weight of silica sol solids, 2 parts by weight of polyvinyl butyral, and ...

Embodiment 3

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

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

[0044] Add 80% of the mass fraction of aluminum dihydrogen phosphate solution and 30% of the mass fraction of silica sol to the mixed raw materials and mix evenly. Based on 100 parts by weight of the active ingredient, the mixture accounts for 2 parts by weight of aluminum dihydrogen phosphate , The silica sol solid matter accounts for 3 parts by weight, polyvinyl butyr...

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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 substrate is modified sepiolite and 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 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 water-containing magnesium-rich silicate clay mineral. In the fibrous crystal structure of sepiolite, there are many tubular through channels consistent with the extension direction of the fibers, making the sepiolite up to 900m 2 / g theoretical...

Claims

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Application Information

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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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