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Adsorbent for ammonia gas recovery and utilization, and preparation method thereof

A technology of adsorbent and ammonia gas, which is applied in the field of environmental purification, can solve the problems of difficulty in forming porous materials, affecting the adsorption capacity, and the unreported effect of adsorbent on adsorbing ammonia gas, and achieves the effect of reduced effect and easy desorption

Inactive Publication Date: 2019-04-30
SINOPEC YANGZI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent uses pure alkaline earth metal chloride as an adsorbent, which is difficult to form a stable porous material, has a small contact area with ammonia, and is easy to swell and agglomerate during the adsorption and desorption process, which affects the adsorption capacity.
[0005] Qingdao Boruilin New Material Co., Ltd. submitted a series of Chinese patents on modifying cinders by various methods to prepare cheap ammonia adsorbents, such as patents CN104069790A, CN104084111A, and CN104084133A, and found that ammonia can be removed by adsorption. However, in this series of patent documents, the effect of the adsorbent prepared by it on the adsorption of ammonia has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (a) Dry 50g of granular activated carbon, cool to normal temperature, add it to 75ml NaOH solution (40% mass fraction), stir at 25°C for 12h, filter off the impregnating solution, and wash with deionized water to medium properties, dry at 110°C for 3 hours before use;

[0034] (b) Calcium chloride and magnesium chloride are configured into a mass fraction of 1% ethanol solution;

[0035] (c) Add the activated carbon prepared in step (a) to the ethanol solution of calcium chloride and magnesium chloride prepared in step (b) and soak for 6 hours, filter out the soaking solution, dry at 110°C for 4 hours, and set aside;

[0036] (d) Calcining the solid product obtained in step (c) at 500° C. for 1.5 h under the protection of nitrogen to obtain an adsorbent for recycling ammonia.

[0037] Calcium chloride and magnesium chloride can be combined in any proportion, and in this embodiment, the mass ratio is 1:1.

[0038] After determination, the adsorbent obtained in Example ...

Embodiment 2

[0041] (a) Dry 50g of strip-shaped activated carbon, cool it to normal temperature, add it to 100ml NaOH solution (30% mass fraction), stir at 25°C for 12h, filter off the impregnation solution, wash with deionized water until medium It can be used after drying at 100℃ for 3 hours.

[0042] (b) Add calcium chloride to ethanol to form a saturated solution.

[0043] (c) Add the activated carbon prepared in step (a) to the calcium chloride solution prepared in step (b) and soak for 10 hours, filter out the soaking solution, dry at 90° C. for 5 hours, and set aside.

[0044] (d) Treat the solid obtained in step (c) for 30 minutes in a 600W microwave oven under the protection of nitrogen to obtain an adsorbent for recycling ammonia.

[0045] After determination, the adsorbent obtained in Example 2 has a mass percent content of active component (calcium chloride) of 45.2%, and a mass percent content of carrier activated carbon of 54.8%. The specific surface area of ​​the adsorbent...

Embodiment 3

[0048] (a) Dry 50g of spherical activated carbon, cool to normal temperature, add it to 50ml of NaOH solution (45% mass fraction), stir at 40°C for 8h, filter off the impregnation solution, wash with deionized water until neutral , dried at 100°C for 3 hours for later use.

[0049] (b) Add magnesium chloride to ethanol to form a saturated solution.

[0050] (c) Add the activated carbon prepared in step (a) to the magnesium chloride solution prepared in step (b) and soak for 8 hours, filter out the soaking solution, dry at 110° C. for 3 hours, and set aside.

[0051] (d) Calcining the solid obtained in step (c) at 500° C. for 2 hours under the protection of nitrogen to obtain an adsorbent for recycling ammonia.

[0052] After determination, the adsorbent obtained in Example 3 has a mass percent content of active component (magnesium chloride) of 47.6%, and a mass percent content of carrier activated carbon of 52.4%. The specific surface area of ​​the adsorbent is 1034m 2 / g....

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Abstract

The invention discloses an adsorbent for ammonia gas recovery and utilization, and a preparation method thereof, wherein the ammonia gas adsorbent comprises, by mass, 30-50% of an active component and50-70% of a carrier, and the active component is one or two selected from alkaline earth metal chlorides. The preparation method comprises: immersing active carbon in a NaOH solution, filtering out the immersing liquid, and drying so as to be spare; preparing an ethanol solution with a certain concentration from an alkaline earth metal chloride; adding the dried active carbon into the ethanol solution, completely immersing, and filtering out the immersing liquid; and curing under an air-isolating condition to prepare the adsorbent for ammonia gas recovery and utilization. According to the present invention, the prepared ammonia gas adsorbent can adsorb a large amount of ammonia gas under normal temperature and low temperature conditions, wherein the adsorption capacity can be up to 0.56 g / g; the desorption is easy after the ammonia gas adsorbent adsorbs ammonia gas, such that the ammonia gas adsorbent can be recycled so as to achieve the environmental protection; and the ammonia gas adsorbing effect is not significantly reduced after 50 cycles of recycling.

Description

technical field [0001] The invention belongs to the technical field of environmental purification, and in particular relates to an ammonia adsorbent and its preparation. Background technique [0002] Ammonia is an important chemical raw material, which is widely used in production and life. According to experts and scholars' research on the composition and causes of PM2.5, it is found that ammonia is one of the culprits in the formation of smog. In addition, in recent years, a large amount of volatile organic compounds have been used in indoor construction and decoration materials, causing indoor ammonia pollution and seriously affecting people's health. Therefore, how to reduce ammonia emissions and reduce the content of ammonia in the environment has become an urgent research solution question. [0003] The treatment of ammonia gas is mainly divided into emission source treatment and activity site treatment. At present, the methods of ammonia treatment mainly include pla...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/81B01D53/58
CPCB01D53/58B01D53/81B01D2253/102B01D2253/112B01D2257/406B01J20/046B01J20/20B01J2220/42B01J2220/4806B01J2220/4812
Inventor 魏延雨孙海龙
Owner SINOPEC YANGZI PETROCHEM
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