Dynamic Study of Oxidative Desulfurization by Iron-based Ionic Liquids/NHD †

doi:10.7503/cjcu20190474

Abstract

Abstract:

The addition of organic solvents in iron-based ionic liquids(Fe-IL) enhances the gas-liquid mass transfer of hydrogen sulfide(H₂S) during desulfurization, which can significantly improve the desulfurization efficiency. Definitely, the addition of organic solvents must has a certain influence on the dynamic properties of the desulfurization system. The dynamic properties of H₂S absorption in the co-solution desulfurization system of Fe-IL/NHD(polyethylene glycol dimethyl ether) in a static absorption reactor was studied. The results show that the dynamic equation of pure Fe-IL desulfurization system is $r = 54.62 exp (- 11720 / RT) · c H 2 S · c Fe (Ⅲ),$ and the absorption and oxidation of H₂S by Fe-IL/NHD is a fast pseudo-first order reaction. After mixing with NHD, the reaction order of Fe(Ⅲ) increases with the increase of the ratio of NHD to Fe-IL. Thus increasing reaction temperature and the ratio of NHD to Fe-IL can enhance the mass transfer process and the reaction rate during the desulfurization process.

Key words: Iron-based ionic liquid, Polyethylene glycol dimethyl ether, H₂S, Desulfurization, Dynamic

CLC Number:

O641
TQ028.8

TrendMD:

ZHANG Li,QIAN Mingchao,LIU Xueke,Gao Shuaitao,YU Jiang,XIE Haishen,WANG Hongbin,SUN Fengjiang,SU Xianghong. Dynamic Study of Oxidative Desulfurization by Iron-based Ionic Liquids/NHD ^†[J]. Chem. J. Chinese Universities, 2020, 41(2): 317.

Figures/Tables 13

Fig.1 Static absorption reactor 1. H2S gas tank; 2. gas reducing valve; 3. pressure flange; 4. precision pressure gauge; 5. thermostat water bath; 6. high pressure absorption reactor; 7. magneto; 8. thermometer; 9. speed controller; 10. inlet valve; 11. outlet valve; 12. tail gas treatment unit.

Variable	Dynamic region
Variable	A	B	C	D	E	F	G	H
Concentration of Fe(Ⅲ)	+	-	+	+	?	?	+	+
Volume fraction of H₂S	+	+	+	+	?	?	+	+
Phase interfacial area	+	+	+	+	+	+	+	-
Volume of desulfurization liquid	-	-	-	-	+	+	+	+
Coefficient of mass transfer in liquid phase	+	-	-	-	?	+	+	-
Coefficient of mass transfer in gas phase	+	-	+	+	?	?	+	-
Second-order reaction rate constant	-	-	+	+	?	?	-	+

No.	Liquid-phase volume/mL
No.	60	80	100
1	1.51	1.49	1.48
2	1.54	1.47	1.49
3	1.52	1.49	1.48

No.	K_L/(r·min^-1)
No.	100	150
1	1.48	1.50
2	1.49	1.52
3	1.48	1.52

No.	Mass ratio of Fe-IL/NHD
No.	8:1	6:1	4:1	1:0
1	1.35	1.41	1.48	1.29
2	1.33	1.42	1.49	1.28
3	1.32	1.42	1.48	1.29

Fig.2 Model of double membrane theory about H2S absorption in Fe-IL/NHD

Fig.3 Fitting relation of interfacial concentration of H2S with absorption rate at different mass ratios of Fe-IL/NHD

Fig.4 Relationship between kov and temperature at different mass ratios of Fe-IL/NHD

Fig.5 Relationship between cFe(Ⅲ) and time at different mass ratios of Fe-IL/NHD

Fig.6 Fitting relation of lnr with lncFe(Ⅲ) at different mass ratios of Fe-IL/NHD

Mass ratio of Fe-IL/NHD	b	R²
1:0	1.07	0.9779
8:1	1.15	0.9771
6:1	1.39	0.9813
4:1	1.56	0.9999

Fig.7 Relationship between Fe(Ⅲ) content and time at different temperatures

Fig.8 Fitting relation of lnr with 1/T

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