Effects of internal stage recycle on efficiency and performance of a mixer-settler

Abstract

= average deactivation function for 11 the reactions, of strength q, defined by eq 2 strengths, min-' strengths and reactants, min-' Registry No. Carbon, 7440-44-0. Literature Cited Absil. R. P. L.; Butt, J. B.; Dranoff, J. S. J. Catal. 1984. 8 5 , 415. Best, D. A.; Pachovsky, R. A.; Wojciechowski, B. W. Can. J. Chem. Eng. Best, D. A.; Wojciechowski, B. W. J. Catal. 1977, 47, 343. Blanding, F. H.; Ind. Eng. Chem. 1953, 45, 1186. Butt, J. 6.; Watcher, C. K.; Billimoria, R. M. Chem. Eng. Scl. 1978, 338 Beranek, L. Catal. Rev. Sci. Eng. 1977, 16(1), 25. Corella, J.; Asua, J. M. Can. J . Chem. Eng. 1981a, 59, 506. Coreila, J.; Asua, J. M. "Proceedlngs, 2nd Work( Congress 0' Chemical Engineering, Montreal, Canada, 198lb; Voi. 111, pp 225-22b. Corella, J.; Asua, J. M. Ind. Eng. Chem. frocessDes. Dev. 1982a, 21, 55. Coreiia, J.; Asua, J. M. Ind. Eng. Chem Process Des. Dev. 1982b, 27, 551. Corella, J.; Asua, J. M. An. Quim. 1984, 80, 715. Corella, J.; Bilbao, J.; Asua, J. M. Can. J. Chem. Eng. 198la, 5 9 , 647. Coreila, J.; Biibao. J ; Aznar, M. P. Int Chem. Eng. 1985a. 2 5 , 2. 1971, 49, 809. 1321. Coreila, J.; Bilbao. J.; Bllbao, R. An. Oulm 1984, 8 0 , 244. Corella, J.; Bilbao, R.: Artlgas, A.; Ing. 0, .m. 198lb. 152, 87. Corella, J.; Blibao, R.; Moilna, J. A. An. Qulm., 1985b. in press. Corella, J.: Iranzo, C.: Fernandez, A.; Labordeta, L. Ing. Ouim. 1983, 170, Coreiia, J.; Menendez, M. Chem. Eng. Sci., 1985~. submitted. Corelia, J.; Mollna, J. A. Ind. Eng. Chem. Process Des. Dev., submitted. Corella, J.; Monzbn, A.; Butt, J. B.; Absil, R. P. L. J. Catal., submitted. Del Angel, G. A.; Coq, 8.: Figueras, F. Nouv. J. Chim. 1983, 7 , 173. Forzatti. P.; Buzzi-Ferraris, G.; Morbidelil, M.; Carra, S. Int. Chem. Eng. 1984, 2 4 , 85.The effects of internal stage recycle on the performance of a mixer-settler is studied with an unfavorable system where 2-ethylbutyric acld Is extracted from kerosene into water. The mixer is designed as a closed, unbaffled, cylindrical vessel operated with continuous-flow, no air-liquid interface, and no air-volute. The contractor is a single stage operated at a constant revolution per minute (rpm) with water as the dispersed phase. Solute concentrations in the feed range are in parts per million (ppm). Effects of efficiency, recovery, mass-transfer rate and coefficient of varying feed flow rate, solvent-to-feed ratio, and recycle ratio are investigated. Extract recycle improves performance even though the distribution ratio is low and varies around 1. Optimal efficiencies are obtained at a flow ratio equal to 1 which significantly improve with recycle and recycle ratios in the region of 0.5 are found to be independent of pure solvent flows.The inffuence of molstue on the thermal degradation of wood waste was investigated by pyrolyzing ground samples in a batch fkr#bed reactor at between 320 and 470 O C in hellurn at 101-104 kPa. The wood samples were heated at about 300 O C / min, so that drying and pyrolysls were simultaneous. The presence of moisture increased the yield of char by as much as ...

Modeling the liquid–liquid extraction equilibrium of iron (III) with hydroxyoxime extractant and equilibrium-based simulation of counter-current copper extraction circuits

“…The phase ratio in each extraction stage can be adjusted by internal stage recycling, and it does not affect the capacity of the total process (Kaul and Van Wormer Jr., 1985). However, mass transfer effects can influence process operation, so the steady-state of a dynamically run process may differ from the one calculated in this article based on extraction equilibrium modeling.…”