Ammonia gas molecularly-imprinted adsorbent for separating gas mixture produced in aerobic composting of sludge and recovering ammonia gas, and preparation method thereof

A molecularly imprinted and adsorbent technology, applied in the field of ammonia molecularly imprinted adsorbent and its preparation, can solve the problems of unresearched ammonia separation in mixed components, unknown ammonia adsorption and separation effect, unknown ammonia dynamic adsorption amount, etc. , to achieve good adsorption selectivity, no need for high temperature and high pressure, and easy to obtain effects

Active Publication Date: 2019-11-19
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent does not study the separation of ammonia in the mixed components, and the separation effect is unknown; there is no simulated adsorption of ammonia for the conditions in the sludge aerobic composting process, and the adsorption stability is unknown
[0014] In general, according to the reported ammonia adsorbents, they are not designed for the purpose of mixed gas separation and ammonia recovery in the sludge aerobic composting process, and the following problems exist: the dynamic adsorption capacity of ammonia is unknown or low, and the mixing group The adsorption and separation effect of ammonia in the fraction is unknown, and the adsorption stability under different conditions in the process of sludge aerobic composting is unknown

Method used

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  • Ammonia gas molecularly-imprinted adsorbent for separating gas mixture produced in aerobic composting of sludge and recovering ammonia gas, and preparation method thereof
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  • Ammonia gas molecularly-imprinted adsorbent for separating gas mixture produced in aerobic composting of sludge and recovering ammonia gas, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1, Preparation of Ammonia Molecularly Imprinted Adsorbent

[0045] Add 48.66 μl of ammonia water and 219.84 μl of methacrylic acid functional monomer into a three-neck flask containing 60ml of toluene, pre-mix for 10min with the assistance of a magnetic stirrer, then add 1.22ml of ethylene glycol dimethacrylate crosslinking agent and 10mg of azobisisobutyronitrile initiator, stirred and mixed. After the reagents are mixed evenly, open the nitrogen bottle, pass nitrogen gas into the three-necked flask, and exhaust for 10 minutes. The three-necked flask exhausted of air was sealed and then heated continuously for 12 hours in a water bath at 60° C. to carry out free radical polymerization. After the reaction was completed, the suspension was removed, and the precipitated substance was repeatedly washed with deionized water, ultrasonically for half an hour, until the ammonium ion was no longer detected in the filtrate (the adsorption performance test method in Exam...

Embodiment 2

[0047] Example 2. Adsorption Performance Test of Ammonia Molecularly Imprinted Adsorbent

[0048] (1) Take 0.2 g of the ammonia molecularly imprinted adsorbent prepared in Example 1 and place it on the adsorption column of the dynamic adsorption device to carry out the ammonia dynamic adsorption experiment (the schematic diagram of the dynamic adsorption device is as follows figure 2 shown), the adsorption conditions and ammonia adsorption capacity are shown in Table 1.

[0049] (2) The maximum discharge ratio of ammonia, methyl sulfide and dimethyl disulfide detected by sludge aerobic composting is about 10:1:1, which is the ratio of the intake concentration of the mixed gas. The selective adsorption test of ammonia gas to methyl sulfide and dimethyl disulfide (ammonia adsorption capacity / methyl sulfide or dimethyl disulfide adsorption capacity) is shown in Table 1.

[0050] The adsorption capacity of ammonia molecularly imprinted polymers on ammonia / methyl sulfide / dimethyl...

Embodiment 3

[0069] Investigate the ammonia adsorption capacity of the product obtained by hydrolysis (step 5) under different acid-base conditions, as shown in table 3:

[0070] table 3

[0071] Adsorbents prepared in different pH solutions Adsorption capacity (mmol / g) pH=13.5 alkaline solution 0.03 pH=12 alkaline solution 0.29 pH=2 acid solution 0.71 pH=0.5 acid solution 7.54 Not hydrolyzed 0.42

[0072] Among them, the detection conditions of the adsorption amount are: the gas flow rate is 200ml / min, the temperature is 20°C, the ammonia gas inlet concentration is 100ppm, and the relative humidity is 0%.

[0073] It can be seen from Table 3 that the ammonia adsorption capacity of the prepared adsorbent varies greatly when hydrolyzed under different pH conditions, and the ammonia adsorption capacity of the adsorbent prepared by hydrolysis in an acid solution with a pH of 0.5 is the highest, up to 7.54mmol / g, therefore, the ammonia molecularl...

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Abstract

The invention provides an ammonia gas molecularly-imprinted adsorbent for separating a gas mixture produced in aerobic composting of sludge and recovering ammonia gas, and a preparation method thereof. The preparation method comprises the following steps: adding ammonia water and an acrylic acid functional monomer into a solvent, and carrying out uniform mixing; adding an azodiisobutyronitrile initiator and an ethylene glycol dimethacrylate cross-linking agent into the formed system, and carrying out uniform mixing; carrying out a free radical polymerization reaction, and collecting sediments;ultrasonically cleaning the sediments to remove a template and a reaction solvent; transferring the eluted sediments into a sulfuric acid solution with a pH value of 0.5, carrying out sealing, and then carrying out a reaction under stirring to hydrolyze a part of ester-based functional groups in the cross-linking agent into carboxyl functional groups; and carrying out washing with deionized water, and performing drying under vacuum to obtain the adsorbent. The adsorbent prepared in the invention has good adsorption selectivity on ammonia gas in gas mixture produced in the composting of sludge, is low in the adsorption capacity of dimethyl sulfide and dimethyl disulfide is low, and realizes efficient separation of ammonia gas, dimethyl sulfide and dimethyl disulfide.

Description

technical field [0001] The invention belongs to gas separation technology, and in particular relates to an ammonia molecule imprinted adsorbent used for the separation of sludge aerobic composting mixed gas and the recovery of ammonia gas and its preparation. Background technique [0002] Aerobic composting is an important treatment method to achieve sludge reduction, harmlessness and resource utilization. However, a large amount of malodorous gases are produced during sludge aerobic composting, and its main components include ammonia, methyl sulfide, and dimethyl disulfide. On-site monitoring found that during the aerobic composting process of sludge, the emission of ammonia gas was as high as 4.35-10.95g / kg dry sludge, and the emissions of methyl sulfide and dimethyl disulfide were 0.071-0.22 and 0.11-0.25g / kg, respectively. kg dry mud. If effective treatment measures are not taken, direct discharge will pollute the ambient air, endanger human health, and severely restri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D53/02C05F17/00
CPCB01J20/261B01D53/02C05F17/00B01D2257/406Y02E50/30
Inventor 孙德智韩张亮徐阳洁田皓中
Owner BEIJING FORESTRY UNIVERSITY
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