Preparation method and application of ZIF8-A-n-heptanol system absorbent
A ZIF8-A-, ZIF8-A technology, applied in the field of ZIF8-A-n-heptanol system absorbent, to achieve the effect of reducing use, reducing consumption, and efficiently removing SO2
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[0023] 1. Preparation of ZIF8-A:
[0024] Utilize existing technology to prepare ZIF8: Dissolve zinc nitrate and 2-methylimidazole in appropriate amount of methanol respectively, pour the methanol solution of 2-methylimidazole into the methanol solution of zinc nitrate, wherein zinc nitrate and 2-methylimidazole The mass ratio of imidazole is 0.9:1, the temperature is controlled at 23-25°C, and the ultrasound is performed for 4 hours. After the reaction solution was allowed to stand for 24 hours, it was washed with methanol and centrifuged three times, and then vacuum-dried at 80° C. for 6 hours to obtain ZIF8.
[0025] Disperse ZIF8 evenly in methanol, and add 3-amino-1,2,4-triazole to the solution after ultrasonication for half an hour (the mass ratio of ZIF8:3-amino-1,2,4-triazole=1:2.9 ), stirred mechanically at 50°C for 8-48h. After standing still, wash with methanol and centrifuge three times, and vacuum dry at 120°C for 12 hours to obtain ZIF8-A. The particle size dis...
Embodiment 1
[0031] Zinc nitrate and 2-methylimidazole are respectively dissolved in an appropriate amount of methanol, and the methanol solution of 2-methylimidazole is poured into the methanol solution of zinc nitrate, wherein the mass ratio of zinc nitrate and 2-methylimidazole is 0.9: 1. The temperature is controlled at 23-25°C and ultrasonicated for 4 hours. After the reaction solution was allowed to stand for 24 hours, it was washed with methanol and centrifuged three times, and then vacuum-dried at 80° C. for 6 hours to prepare ZIF8.
[0032] Disperse 0.15g ZIF8 in 4.1g (5ml) n-heptanol, and ultrasonicate for 15min to obtain ZIF8-n-heptanol system absorption desulfurizer. Zn in ZIF8 is Zn in zinc nitrate 2+ Prepared ultrasonically with 2-methylimidazole in methanol solution, Zn 2+ The degree of saturation is high, so no pre-vulcanization is required.
[0033] Pack ZIF8-n-heptanol system absorption desulfurizer in fixed bed absorption tube, at 25°C, 180h -1 Absorb sulfur dioxide ...
Embodiment 2
[0036] Use 0.585g of 3-amino-1,2,4-triazole to carry out amino functionalization on 0.2g of ZIF8. The specific method is: uniformly disperse ZIF8 in methanol, add 3-amino-1, 2,4-triazole, stirred mechanically at 50°C for 8h. After standing still, wash with methanol and centrifuge three times, and vacuum-dry at 120°C for 12 hours to prepare ZIF8-A.
[0037]Disperse 0.15g ZIF8-A in 4.1g (5ml) n-heptanol, sonicate for 15min, the composition of flue gas is 4.0%SO 2 , 96%N 2 , 25℃, 180h -1 Precure ZIF8-A for 5h under the condition of SO 2 After saturation, use N 2 Desorb at 160°C for 90 minutes, and after the whole pre-sulfurization process is completed, the ZIF8-A-n-heptanol system absorption desulfurizer is obtained.
[0038] Pack ZIF8-A-n-heptanol system absorption desulfurizer in fixed bed absorption tube, at 25°C, 180h -1 Absorb sulfur dioxide in the flue gas under space velocity conditions, and the flue gas composition is 4.0% SO 2 , 96%N 2 . The absorption of sulfur...
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