以非晶态合金催化剂SRNA-4为固相的气液固磁稳定床的界面传质研究

CIESC Journal

• TRANSPORT PHENOMENA & FLUID MECHANICS • 上一篇下一篇

以非晶态合金催化剂SRNA-4为固相的气液固磁稳定床的界面传质研究

李韡^a; 宗保宁^b; 李晓芳^a; 孟祥坤^b; 张金利^a

^a School of Chemical Engineering, Tianjin University, Tianjin 300072, China
^b Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-12-28 发布日期:2006-12-28
通讯作者: 李韡

Interphase mass transfer in G-L-S magnetically stabilized bed with amorphous alloy SRNA-4 catalyst

LI Wei^a; ZONG Baoning^b; LI Xiaofang^a; MENG Xiangkun^b; ZHANG Jinli^a

^a School of Chemical Engineering, Tianjin University, Tianjin 300072, China
^b Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China

Received:1900-01-01 Revised:1900-01-01 Online:2006-12-28 Published:2006-12-28
Contact: LI Wei

摘要/Abstract

摘要： Gas-liquid (G-L) and liquid-solid (L-S) mass transfer coefficients were characterized in a gas-liquid-solid (G-L-S) three-phase magnetically stabilized bed (MSB) using amorphous alloy SRNA-4 as the solid phase. Effects such as superficial liquid velocity, superficial gas velocity, magnetic strength, liquid viscosity, and particle size were investigated. Experimental results indicated that the G-L volumetric mass transfer coefficients (KLa) increased along with the magnetic strength, superficial gas and liquid velocities. Proper increase of liquid viscosity promoted KLa only in the range of lower liquid viscosity. The external magnetic field made L-S mass transfer coefficients (Ks) in the G-L-S MSB lower than those of conventional fluidized beds. Ks in the MSB almost kept constant as the su-perficial liquid velocity and superficial gas velocity increased and decreased with the liquid viscosity and surface tension, while increased with the particle size Ks showed uniform axial and radial distributions except of small de-creases close to the wall. Dimensionless correlations were established to estimate KLa and Ks of the MSB with SRNA-4 catalysts , which showed the average error of 5.4% and 2.5% respectively.

关键词: magnetically stabilized bed;gas-liquid mass transfer;liquid-solid mass transfer;SRNA-4 catalyst

Abstract: Gas-liquid (G-L) and liquid-solid (L-S) mass transfer coefficients were characterized in a gas-liquid-solid (G-L-S) three-phase magnetically stabilized bed (MSB) using amorphous alloy SRNA-4 as the solid phase. Effects such as superficial liquid velocity, superficial gas velocity, magnetic strength, liquid viscosity, and particle size were investigated. Experimental results indicated that the G-L volumetric mass transfer coefficients (KLa) increased along with the magnetic strength, superficial gas and liquid velocities. Proper increase of liquid viscosity promoted KLa only in the range of lower liquid viscosity. The external magnetic field made L-S mass transfer coefficients (Ks) in the G-L-S MSB lower than those of conventional fluidized beds. Ks in the MSB almost kept constant as the su-perficial liquid velocity and superficial gas velocity increased and decreased with the liquid viscosity and surface tension, while increased with the particle size Ks showed uniform axial and radial distributions except of small de-creases close to the wall. Dimensionless correlations were established to estimate KLa and Ks of the MSB with SRNA-4 catalysts , which showed the average error of 5.4% and 2.5% respectively.

Key words: magnetically stabilized bed, gas-liquid mass transfer, liquid-solid mass transfer, SRNA-4 catalyst

李韡, 宗保宁, 李晓芳, 孟祥坤, 张金利. 以非晶态合金催化剂SRNA-4为固相的气液固磁稳定床的界面传质研究[J]. CIESC Journal.

LI ,Wei, ,ZONG ,Baoning, ,LI ,Xiaofang, MENG ,Xiangkun, ZHANG ,Jinli. Interphase mass transfer in G-L-S magnetically stabilized bed with amorphous alloy SRNA-4 catalyst[J]. .

参考文献

1    Weng, D.C., Cheng, L.N., Han, Y., Zhu, W.X., Xu S.M., Ouyang, F., “Continuous ethanol fermentation in a three-phase magnetic fluidized bed bioreactor”, AIChE Symposium Series, Fluidized Processes: Theory and Practice, 88, 107—115(1992).
2    Thompson, V.S, Worden, R.M, “Phase holdup, liquid dispersion, and gas-to-liquid mass transfer measurements in a three-phase magnetofluidized bed”, Chem. Eng. Sci., 52, 279—295(1997).
3    Al-Qodah, Z., Al-Hassan, M., “Phase holdup and gas-to-liquid mass transfer coefficient in magneto stabi-lized G-L-S airlift fermenter”, Chem. Eng. J., 79, 41—52(2000).
4    Chen, C.M., Leu, L.P., “Hydrodynamics and mass trans-fer in three-phase magnetic fluidized beds”, Powder Technol., 117, 198—206(2001).
5    Webb, C., Kang, H.K., Moffat, G., Williams, R.A., “Magnetically stabilized fluidized bed bioreactor: A tool for improved mass transfer in immobilized enzyme sys-tems”, Chem. Eng. Biochem. Eng., 61, 241—246(1996).
6    Jovanovic, G., Al-Mulhim M., “Liquid-solid mass trans-fer in magnetically stabilized fluidized beds”, In:  A.I.Ch.E. Annual Meeting, Miami Beach, CA (1995).
7    Bramble, J.L., Graves, D.J., Brodelius, P., “Plant cell cul-ture using a novel bioreactor: The magnetically stabilized fluidized bed”, Biotechnol. Prog., 6, 452—457(1990).
8    Hausmann, R., Reichert, C., Franzreb, M., Holl, W. H., “Liquid-phase mass transfer of magnetic ion exchangers in magnetically fluidized beds II. AC field”, React. Funct. Polym., 60, 17—26(2004).
9    Hausmann, R., Hoffmann, C., Franzreb, M., Holl, W.H., “Mass transfer rates in a liquid magnetically stabilized fluidized bed of magnetic ion-exchange particles”, Chem. Eng. Sci., 55, 1477—1482(2000).
10    Franzreb, M., Hausmann, R., Hoffmann, C., Holl, W.H., “Liquid-phase mass transfer of magnetic ion exchangers in magnetically fluidized beds I. DC fields”, React. Funct. Polym., 46, 247—257(2001).
11    Cheng, C.Y., Yung, K., “Effect of magnetic field on heat and mass transfer by natural convection from vertical surfaces in porous media-an integral approach”, Int. Comm. Heat Mass Transfer, 126, 935—943(1999).
12    Meng, X.K., Mu, X.H., Zong, B.N., Min, E.Z., Zhu, Z.H., Fu, S.B., Luo, Y.B.. “Purification of caprolactam in magnetically stabilized bed reactor”, Catal. Today, 79—80, 21—27(2003).
13    Zhang, Y.Q., Mao, Z.S., Chen, J.Y., “Gas-liquid mass transfer of oxygen-decane-sodium sulfite system in a stirred autoclave reactor”, Eng. Chem. Metall, 21,123—127(2000). (in Chinese)
14    Rao, V.G, Drinkenburg, A.A.H, “Solid-liquid mass trans-fer in packed beds with cocurrent gas-liquid downflow”, AIChE J., 31, 1059—1068(1985).
15    Yasunishi, A., Fukuma, M., Muroyama, K., “Wall-to-liquid mass transfer in packed and fluidized beds with gas-liquid concurrent upflow”, J. Chem. Eng. Jpn. 21, 522—528(1988).
16    Muroyama, K., Yoshikawa, T., Takakura, S., Yamanaka, Y., “Mass transfer from an immersed cylinder in three-phase systems with fine suspended particles”, Chem. Eng. Sci., 52, 3861—3868(1997).
17    Lara-Marquez, A., Larachi, F., Wild, G., Laurent, A., “Mass transfer characteristics of fixed beds with concur-rent upflow and downflow, A special reference to the effect of pressure”, Chem. Eng. Sci., 47, 3485—3492(1992).
18    Chen, C.M., Leu, L.P., “A highly elevated mass transfer rate process for three-phase liquid-continuous fluidized beds”, Chem. Eng. J., 81, 223—230(2001).
19    Song, J., Hyndman, C. L, Kantzas, A, “Effect of particle tethering and scale-up on solid-liquid mass transfer in three-phase fluidized beds of light particles”, Can. J. Chem. Eng., 79, 557—563(2001).
20    Hassanien, D.S.H, Riba, J.L., “Transfer de matiere liq-uide-particules en fluidisation a trios phase”, Entropie, 119, 17—26(1984).

以非晶态合金催化剂SRNA-4为固相的气液固磁稳定床的界面传质研究

Interphase mass transfer in G-L-S magnetically stabilized bed with amorphous alloy SRNA-4 catalyst

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 0

编辑推荐

Metrics

本文评价