Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30172
Analysis of Foaming Flow Instabilities for Dynamic Liquid Saturation in Trickle Bed Reactor

Authors: Vijay Sodhi, Ajay Bansal

Abstract:

The effects of different parameters on the hydrodynamics of trickle bed reactors were discussed for Newtonian and non-Newtonian foaming systems. The varying parameters are varying liquid velocities, gas flow velocities and surface tension. The range for gas velocity is particularly large, thanks to the use of dense gas to simulate very high pressure conditions. This data bank has been used to compare the prediction accuracy of the different trendlines and transition points from the literature. More than 240 experimental points for the trickle flow (GCF) and foaming pulsing flow (PF/FPF) regime were obtained for present study. Hydrodynamic characteristics involving dynamic liquid saturation significantly influenced by gas and liquid flow rates. For 15 and 30 ppm air-aqueous surfactant solutions, dynamic liquid saturation decreases with higher liquid and gas flow rates considerably in high interaction regime. With decrease in surface tension i.e. for 45 and 60 ppm air-aqueous surfactant systems, effect was more pronounced with decreases dynamic liquid saturation very sharply during regime transition significantly at both low liquid and gas flow rates.

Keywords: Trickle Bed Reactor, Dynamic Liquid Saturation, Foaming, Flow Regime Transition

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1057799

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1397

References:


[1] Geldart, D., Gas fluidization technology, John Wiley & Sons Ltd., Chichester, 1986.
[2] Burghardt, A.; Bartelmus, G.; Szlemp, A. 1995. Hydrodynamics of pulsing flow in three-phase fixed-bed reactor operating at an elevated pressure, Industrial and Engineering Chemistry Research 43, 4511- 4521.
[3] Bansal, A.; Wanchoo, R. K.; and Sharma, S. K., 2008. Flow regime transition in a trickle bed reactor, Chemical Engineering Communication 58 111-118.
[4] Bansal, A., Ph.D Thesis, 2003. Hydrodynamics of trickle bed reactor, Engineering and Technology Faculty, Punjab University, Patiala, Punjab, India.
[5] Prud-homme, R.K. and Khan S.A., ÔÇÿFoams, Theory, Measurements, and Applications-, CRC Press, 1996.
[6] Midoux, N.; Favier, M.; Charpentier, J.C. 1976. Flow patterns, Pressure loss and Liquid hold up data in Gas Liquid Downflow Paced Beds with Foaming and Non-foaming Hydrocarbons, Journal of Chemical Engineering, Japan, 9, 50.
[7] Schwartz, J. G., Wegei, E. and Dudukovic, M. P., 1976, A new tracer method for determination of liquid-solid contacting efficiency in tricklebed reactors, A.I.Ch.E.J. 22, 894-904.
[8] Saroha, A.K., Nigam, K.D.P.; 1996. Trickle bed reactors, Reviews in Chemical Engineering 12, 207-347.
[9] Holub R.A, Dudukovic M.P., Ramachandran P.A.A.; 1992, Phenomenological model for pressure drop, liquid holdup and flow regimes transition in gas-liquid trickle flow, Chemical Engineering, Science 47, 2343-2348.
[10] Grandjean B. P. A., Iliuta. I., Larachi, F.; 2002, New mechanistic model for pressure drop and liquid holdup in trickle flow reactors, Chemical Engineering Science 57, 3359 - 3371.
[11] Bartelmus G., Janecki, D.; 2003. Hydrodynamics of a cocurrent downflow of gas and foaming liquid through the packed bed. Part II. Liquid holdup and gas pressure drop, Chemical Engineering Process. 42, 993-1005.
[12] Larachi, F., Laurent, A., Midoux, N., Wild, G.; 1991. Experimental study of a trickle bed reactor operating at high pressure: two-phase pressure drop and liquid saturation. Chemical Engineering Science 46, 1233-1246.
[13] Iliuta, I., Larachi, F.; 2003, Onset of pulsing in gas-liquid trickle bed & filtration, Chemical Engineering Science 59, 1199 - 1211.
[14] Aydin, B., Larachi, F.; 2008. Trickle bed hydrodynamics for non- Newtonian foaming liquids in non-ambient conditions. Chemical Engineering Journal 143, 236-243.
[15] Charpentier J.C., Favier M.; 1975, Some liquid holdup experimental data in trickle bed reactors for foaming and non-foaming hydrocarbons, A.I.Ch.E. Journal 21, 1213-1218.
[16] Sai, P.S.T., Varma, Y.B.G.; 1987. Pressure drop in gas-liquid downflow through packed beds, American Institute of Chemical Engineering. Journal 33, 2027-2035.
[17] Szlemp, D.; Janecki, A.; and Bartelmus, G.; 2001. Hydrodynamics of a co-current three-phase solid-bed reactor for foaming systems, Chemical Engineering Science 56, 1111-1116.
[18] Bartelmus G, A., Gancarczyk, T., Kr├│tki, T., Mokros; Solid - liquid mass transfer in a fixed - bed reactor operating in induced pulsing flow regime, European Congress of Chemical Engineering (ECCE-6) Copenhagen, 16-20 September 2007.
[19] Meng and Chung; Shorter communication, 1999, Experimental evidence of hysteresis of pressure drop for countercurrent gas-liquid flow in a fixed bed, Chemical Engineering Science, Vol. 53, No. 2, 367- 369
[20] A. Attou, G. Ferschneider, 2000, A two-fluid hydrodynamic model for the transition between trickle and pulse flow in cocurrent gas-liquid packed-bed reactor, Chem. Eng. Sci. 55 491-511.
[21] Gupta, R., and Bansal, A.; 2010. Hydrodynamic Studies on a Trickle Bed Reactor for Foaming Liquids. Bulletin of Chemical Reaction Engineering & Catalysis, 5 (1), 31 - 37.