THE CANADIAN JOURNAL OF CHEMICAL ENGINEERING |
Table of Contents - 1988 - Volume 66 |
Articles The Importance of Real-Fluid Behavior and Nonisentropic Effects in Modeling Decompression Characteristics of Pipeline Fluids for Application in Ductile Fracture Propagation • D.J. Picard and P.R. Bishnoi . . . 3 Ventilation of a Dead-End Duct Having a Porous Barrier • J.T. Ryan and Wayne H. Griffin . . . 13 Gas Holdup and Gas Entrainment of a Plunging Water Jet with a Constant Entrainment Guide • Kazumori Funatsu, Yung-Chien Hsu and Takewi Kamogawa . . . 19 Dispersing Behaviour of Droplets in Suspension Polymerization of Styrene in a Loop Reactor • Masato Tanaka and Siji O'shima . . . 29 Particle Transport in Fouling Caused by Kaolin-Water Suspensions on Copper Tubes • L.F. Melo and J.D. Pinheiro . . . 36 Influence of Operating Conditions on Particulate Fouling • H. Müller-Steinhagen, F. Reif, N. Epstein and A.P. Watkinson . . . 42 The Deposition of Haematite Particles from Flowing Water • R. Williamson, I. Newson and T.R. Bott . . . 51 Initial Fouling of Nontoxic Coatings in Fresh, Brackish, and Sea Water • A.E. Meyer, R.E. Baier and R.W. King . . . 55 Surface Phenomena and Hydrodynamic Effects on the Deposition of Pseudomonas fluorescens • M.M. Pinheiro, L.F. Melo, T.R. Bott, J.D. Pinheiro and L. Leitao . . . 63 Mixed Convection Heat Transfer in Porous Media in the Non-Darcy Regime • Rafiqul M. Islam and K. Nandakumar . . . 68 Mass Transfer at Erosion-Corrosion Roughened Surfaces • J. Postlethwaite and U. Lotz . . . 75 Oxygen Transfer into Newtonian and Non-Newtonian Fluids in Mechanically Agitated Vessels • Ali Ogut and Randolph T. Hatch . . . 79 Cinétique de dégagement des matières volatiles lors de la pyrolyse d'électrodes de carbone industrielles • François Tremblay et André Charette . . . 86 Toxic Effects of Inhibitors in Biological Wastewater Treatment Processes • R.D. Tyagi and D. Couillard . . . 97 Pretreatment of Wood Flour Slurries Prior to Liquefaction • C. Vanesse, J.P. Lemonnier, D. Eugène, E. Chornet and R.P. Overend . . . 107 Liquefaction of Lignocellulosics in Model Solvents: Creosote Oil and Ethylene Glycol • C. Vanesse, E. Chornet and R.P. Overend . . . 112 A Scanning Electron Microscope Study of Structural Changes During the Liquefaction of Poplar Sticks by Rapid Aqueous Thermolysis • David G.B. Boocock and L. Kosiak . . . 121 Measurement of Heat of Mixing for Ammonium Chloride + Ammonia System at 25°C • Hideki Yamamoto, Seiji Sanga and Jungi Tokumaga . . . 127 Vapor-Liquid Equilibrium, Excess Gibbs Energy and Excess Enthalpy of 1,3 Dioxolane-Methylcyclohexane at T = 313.15 K • Carlo Castellari, Romolo Francesconi and Fabio Comelli . . . 131 Liquid-Liquid Equilibria of the System Water + Acetic Acid + Methyl Propyl Ketone • A. Blanco, J.M. Correa and A. Correa . . . 136 Suboptimal Control Through Model Reduction • Y.P. Gupta . . . 141 Notes Frictional Loss in Multiple Bubble Columns • B.H. Chen and H. Wakao . . . 145 Drop Size Distribution in a Liquid-Liquid Spray Column via a Photographic Technique • F. Lin and J.D. Ford . . . 150 The Influence of Fluid Elasticity on Wall Effects for Creeping Sphere Motion in Cylindrical Tubes • R.P. Chhabra and P.H.t. Uhlherr . . . 154 Gas-Solid Contacting in a Two-Dimensional Fluidized Bed Containing Mobile Internals: Non-Reactive Tracer Studies • E.A.M. Gbordzoe, H. Littman and M.A. Bergougnou . . . 158 Attrition of Spherical Electrode Carbon Particles During Batch Fluidized Combustion • P.K. Halder, P. Salatino and U. Arena . . . 163 Optimal Design on an Economic Basis for Continuous Stirred Tank Reactors in Series Using Michaelis-Menten Kinetics for Ping-Pong Reactions • F. Xavier Malcata . . . 168
April 1988 Articles Boundary Element Prediction of the Free Surface Shape between Two Particle Plugs in a Horizontal Pneumatic Transport Pipeline • K. Konrad . . . 177 Hydrodynamics and Liquid Phase Axial Mixing in Orifice Pipe Reactor • A.M. Lali, A.S. Khare, J.B. Joshi, A.C. Eapen, S.M. Rao, V.N. Yelgaonkar and R.L. Ajmera . . . 182 Mass Transfer Characteristics in a Gas-Liquid Reciprocating Plate Column. I. Liquid Phase Volumetric Mass Transfer Coefficient • Dejan Skala and Vlada Veljkovic . . . 192 Mass Transfer Characteristics in a Gas-Liquid Reciprocating Plate Column. II. Interfacial Area • Vlada Veljkovic and Dejan Skala . . . 200 Characteristics of a Countercurrent Reciprocating Plate Bubble Column. I. Holdup, Pressure Drop and Bubble Diameter • N.V. Rama Rao and M.H.I. Baird . . . 211 Characteristics of a Countercurrent Reciprocating Plate Bubble Column. II. Axial Mixing and Mass Transfer • M.H.I. Baird and N.V. Rama Rao . . . 211 Dispersed Phase Holdup and Drop Size Distribution in Pulsed Plate Columns • A. Prabhakar, g. Sriniketan and Y.B.G. Varma . . . 232 Determination and Correlation of Axial-Mixing Parameters in an Agitated Liquid-Liquid Extraction Column • Ladislav Steiner, Anil Kumar and Stanley Hartland . . . 241 On the Modelling of Multicomponent Acid Extraction with Long-Chain Aliphatic Amines • Stig Stenstrom and Stig Wingefors . . . 248 On the Examination of Recycle on Heat (and Mass) Transfer in Concentric Tubes • Ho-Ming Yeh, Shau-Wei Tsai and Mean-Chu Hsiey . . . 258 Theoretical Evaluation of the Performance Characteristics of a Combined Hemodialysis/Hemoperfusion System — I. Single Pass Flow • Chau-Jen Lee and Yen-Lin Chang . . . 263 Gas Filtration in Grannular Moving Beds — An Experimental Study • J. Tsubaki and Chi Tien . . . 271 Effect of Zeta Potentials of Oil Droplets and Bubbles on Flotation of Oil-in-Water Mixtures • Kenji Okada, Yasuharu Akagi and Naoya Yoshioka . . . 276 Modified Oil Agglomeration Process for Coal Beneficiation. I. Mineral Matter Liberation by Fine Grinding with the Szego Mill • Oliver Bajor and Olev Trass . . . 282 Modified Oil Agglomeration Process for Coal Beneficiation. II. Simultaneous Grinding and Oil Agglomeration • Olev Trass and Oliver Bajor . . . 286 An Accelerated Successive Substitution Method for Single Stage Flash Calculations • Anup K. Gupta, P.R. Bishnoi and N. Kalogerakis . . . 291 Moment Analysis of Nonlinear Systems: A Kinetic Study • Bing Joe Hwang and Tse-Chuan Chou . . . 297 The Importance of Temperature Rise Time in Pyrolysis Kinetic Studies • Ashutosh Rastogi, William Y. Svrcek and Leo A. Behie . . . 303 CO2 Gasification of Wood Charcoals Derived from Vacuum and Atmospheric Pyrolysis• P. Plante, C. Roy and E. Chornet . . . 307 Hydrocracking of n-Heptane with a NiO-MoO3/HYUS Zeolite as Catalyst. Kinetic Study • M.I. Vazquez, A. Escardino and A. Aucejo . . . 313 High Pressure Phase Equilibria in the Carbon Dioxide — n-Hexadecane and Carbon Dioxide — Water Systems • Rupert D'Souza, Jennie R. Patrick and Amyn S. Teja . . . 319 A Finite Element Model of the Ventilation Pattern Inside an Industrial Building: Non-Isothermal Case • P.A. Tanguy and M. Dupuis . . . 324 Notes Gas Holdup in a Two-Phase Vertical Tubular Reactor at High Pressure • T.J.W. de Bruijn, J.D. Chase and W.H. Dawson . . . 330 Conjugate Heat Transfer in Turbulent Falling Liquid Films • R.S.R. Gorla and T. Maloney . . . 334 Kinetic Study of Isotopic Exchange Reaction Between Hydrogen and Water Vapor Over a Pt/SDBC Hydrophobic Catalyst Sheet • Koei Kawakami, Minoru Isobe, Kanya Horiki and Koichiro Kusunoki . . . 338 Kinetics of the Methanation of Carbon Dioxide over a Supported Ni-La2O3 Catalyst • Takami Kai, Takeshige Takahashi and Shintaro Furusaki . . . 343
June 1988 Articles Flow Pattern of the Phases and Liquid Saturation in Gas-Liquid Concurrent Downflow Through Packed Beds • P.S.T. Sai and Y.B.G. Varma . . . 353 Laminar Mixed Convection in the Entrance Region of Shrouded Arrays of Heated Rectangular Blocks • Jenn-Nan Lin, Chen-Shyong Yen and Fu-Chu Chou . . . 361 Heat Transfer Modelling of Sieve Trays • D.A. Spagnolo, E.L. Plaice, H.J. Neuberg and K.T. Chuang . . . 367 Performance of Packings for Water Distillation • K.T. Chuang and A.I. Miller . . . 377 Flotation Kinetics for Titanium, Zirconium and Bitumen Recovery from Oilsand Tailings • M.T. Ityokumbul, W. Bulani and N. Kosaric . . . 382 Decontamination of Petroleum Sludges by Hot Water Extraction • Francis T. Tran, Denis Couillard and Denis Rouleau . . . 386 The Effect of Surfactants on Peat Dewatering • D.G. Cooper, E.R.A. Eccles and J.D. Sheppard . . . 393 Membrane Formation Through the Phase-Inversion of Poly(vinylidene)/Dimethylformamide Solutions. Experimental and Theoretical Study of Evaporative Flux • R. Francesconi and C. Castellari . . . 398 Kinetics of Reactions Involved in Pyrolysis of Cellulose. I. The Three Reaction Model • Ravindra K. Agrawal . . . 403 Kinetics of Reactions Involved in Pyrolysis of Cellulose. II. The Modified Kilzer-Broido Model • Ravindra K. Agrawal . . . 413 A Gas-Solid Reaction Model — Variable Temperature, Pressure and Structural Parameters • M.A. Hastaoglu and M.S. Hassam . . . 419 Regeneration of Cracking Catalyst Influence of the Homogeneous CO Postcombustion Reaction • K. Morley and H.I. de Lasa . . . 428 Dehydration of I-Phenylethanol over Solid Acidic Catalysts • Takeshige Takahashi, Takami Kai and Massashi Tashiro . . . 433 The Plasma Production of Ultrafine Silica Particles • I. Gans and W.H. Gauvin . . . 438 The Effects of Ferrous Iron, Dissolved Oxygen, and Inert Solids Concentrations on the Growth of Thiobacillus ferrooxidans • M.S. Liu, R.M.R. Branion and D.W. Duncan . . . 445 Prediction and Experimental Determination of Vapour-Liquid Equilibria for Benzene + Cyclohexane + I-Butanol Mixtures at 101.325 kPa • A. Arce, A. Blanco, A. Correa and J. Tojo . . . 452 Heats of Mixing of Amine/Alkane and Amine/Alcohol Systems at 282.15 and 308.15 K. Correlation and Prediction with AGSM and with the Quasi-Chemical Theory • J.F. Chamblain and J.H. Vera . . . 458 Solubilities of Propene, Butane, Isobutane and Isobutene Gases in n-Octane, Chlorobenzene and n-Butanol Solvents • W. Hayduk, H. Astani and Y. Miyano . . . 466 Viscosities of Binary Liquid Mixtures of Cyclohexanone with Alkanes, Benzene, Toluene and Tetrachloromethane at 298.15 K • K. Purna Chandra Rao and K.S. Reddy . . . 474 Use of Nonlinear Transformation and a Self-tuning Regulator to Develop an Algorithm for Catalytic Reactor Temperature Control • D. Onderwater, J.F. MacGregor and J.D. Wright . . . 478 Self-Tuning Control of Fischer-Tropsch Synthesis in a Tube-Wall Reactor • Sohrab Rohani, D.W. Quail and N.N. Bakhshi . . . 485 Notes Prandtl Number Effect on Combined Free and Forced Laminar Convection in the Thermal Entrance Region of a Horizontal Tube • F.C. Chou and G.J. Hwang . . . 493 Effect of Gas Sparging on the Rate of Mass Transfer at Fixed Beds of Horizontally Stacked Screens • F.A. Katkout, A.A. Zatout, H.A. Farag and G.H. Sedahmed . . . 497 Adsorption of I-Butanethiol from Kerosene Oil on Red Mud • A.P. Singh, P.C. Singh, K.K. Panday and V.N. Singh . . . 501 Analysis of Deactivation Disguised Kinetics in Transport Reactors by Periodic Operation • S. Sivakumar, M. Chidambaram and H.S. Shankar . . . 505 A Model for Microencapsulation in Polyurea Shell by Means of Interfacial Polycondensation • Mayur Sirdesai and Kartic C. Khilar . . . 509 Economic Aspects of Wood-Burning Installations • M. Fels, D.F. Cooper and M.N. Patterson . . . 514 Solubility of H2S and CO2 in Sulfolane • B.E. Roberts and A.E. Mather . . . 519 Gamma-Ray Method for Measuring Liquid Expansion Coefficient at High Temperatures and Pressures • D.D.S. Liu, D.J. Patmore, T.S. Yuyitung, J.J. Lipsett and K. Chapman . . . 526
Articles Generalized Solutions for a Dead-end Duct Having a Permeable Barrier • J.T. Ryan and Wayne H. Griffin . . . 529 Displacement of Bitumen from Reconstituted Oil Sands by Aqueous Solutions • J.L. Margeson, V. Hornof, G.H. Neale and the late D.K. Faurschou . . . 536 A General Correlation for Purely Viscous Non-Newtonian Fluids Flowing in Ducts of Arbitrary Cross-Section • K.C. Tam and C. Tiu . . . 542 Flow and Heat Transfer Characteristics of Structural Viscosity Fluids • R.E. Gaidos, R. Darby an G. Wickern . . . 550 Optimal Design of a Heat Exchanger Undergoing Reaction Fouling • P.J. Fryer, P.J. Hobin and S.P. Mawer . . . 558 End Wall Effects on Thermal Stratification and Heat Transfer in a Vertical Enclosure with Offset Partitions • R. Jetli and S. Acharya . . . 563 Particle-Liquid Mass Transfer in Three Phase Sparged Reactor • S.V. Jadhav and V.G. Pangarkar . . . 572 A Method for the Design of Flexible Distillation Sequences • R.M. Wagler and P.L. Douglas . . . 579 Strategies for solving The Chemical Equilibrium Problem and an Efficient Microcomputer-Based Algorithm • William R. Smith and R.W. Missen . . . 591 Gas Absorption with Exothermic Bimolecular Reaction in a Thin Liquid Film: Fast Reactions • A. Bhattacharya, R.V. Gholap and R.V. Chaudhari . . . 599 Dynamic Analysis of Changes in Diffusion and Sorption Parameters in the Reaction of SO2 with Activated Soda Ash • Gülsen Dogu, Aliye Keskina nd Timur Dogu . . . 605 The Kinetics of the Oxidation of Propylene Over a Bismuth Molybdate Catalyst • H.S. Tan, J. Downie and D.W. Bacon . . . 611 Optimal Temperature Policies for Catalytic Transport Reactors under Periodic Operation • S. Sivakumar, M. Chidambaram and H.S. Shankar . . . 619 On-Line Estimation of Microbial Specific Growth-Rates: An Illustrative Case Study • D. Dochain and A. Pauss . . . 626 The Development of a Mini-Plant Chlorinator for Ferric Chloride Leach Processes • K.G. Tan and P.L. Bedard . . . 632 Reactions of Cyclopentane on HY Zeolite • J. Abbot and B.W. Wojciechowski . . . 637 Isobaric Vapor-Liquid Equilibrium and Liquid-Phase Enthalpy of Mixing Data for the Binary Mixtures of m- or p-Xylene with Cyclohexanol • Fabio Comelli, Romolo Francesconi and Antonio Arcelli . . . 644 Viscosity of n-Alcohol Binary Mixtures • M.J. Orts, P. Medina, A. Aucejo and M.C. Burguet . . . 651 Properties of Cold Lake Bitumen Saturated with pure Gases and Gas Mixtures • Anil K. Mehrotra and William Y. Svrcek . . . 656 Correlation and Prediction of Gas Solubility in Cold Lake Bitumen • Anil K. Mehrotra and William Y. Svrcek . . . 666 Application of Different Criteria for Uniqueness to the Tubular Reaction Problem • H.J. Viljoen and N.F.J. van Rensberg . . . 671 Notes Mixing and Segregation in a Liquid Fluidized Bed of Particles with Different Size and Density • B.K. Dutta, Suman Bhattacharya, S.K. Chaudhury and B. Barman . . . 676 Performance of a Hydro-filter — Mass Transfer Coefficient and Gas Liquid Interfacial Area • S. Uchida, M. Sumiyama and H. Kamo . . . 681 Ethylene Recovery From Low Grade Gas Stream by Adsorption on Zeolites and Controlled Desorption • Raymond Le Van Mao and Gerald P. McLaughlin . . . 686 A General Solution for the Transient Response of Heterogeneous Continuous-Flow Stirred Reactors • Ravindra Datta . . . 691 The Effects of Catalyst Surface Heterogeneity on the Fischer-Tropsch Synthesis • N.M. Rice, C.C. Hsu and B.W. Wojciechowski . . . 694 Calculation of Some Thermodynamic Properties of Gaseous Water by Means of BWR Equation of State • D.K. Grozdanic, B.D. Djordjevic and A.Z. Tasic . . . 697 An Improvement on the Quraishi-Fahidy Method of Dimensional Analysis • J.J.J. Chen . . . 701
Articles Correlations for Wall and Particle Shape Effects on Fixed Bed Bulk Voidage • Anthony G. Dixon . . . 705 Rheological Properties of Polymer-added Lubricating Oils • A. Derdouri, A. Ait-Kadi and P.J. Carreau . . . 709 The Entry Length for Flurries in Horizontal Pipeline Flow • J.M. Colwell adn C.A. Shook . . . 714 Dispersive-force Modelling of Turbulent Suspension in Heterogeneous Slurry Flow • K.C. Wilson and P.J. Pugh . . . 721 Flocculation of Kaolin Suspension with Cationic Polymer • Hiroyuki Kage, Yoshizo Matsuno and Ko Higashitani . . . 728 Jet Penetration and Pressure Drops in Water Spouted Beds of Fine Particles • M.H. Morgan, III, H. Littman and B. Sastri . . . 735 Pressure Drop Through Multiorifice Gas Distributors in Fluidized Bed Columns • C.L. Briens, A.K. Tyagi and M. A. Bergougnou . . . 740 Study of the Transport Disengaging Height • T. Baron, C.L. Briens and M.A. Bergougnou . . . 749 Role of the Contact Points Between Particles on the Reactivity of Solids • Yu-Jun Hao and Tatsuo Tanaka . . . 761 Analysis of Mass and Energy Balance Equations in Gas-Solid Reactions • M.N. Oguztöreli, A. Chambers and B. Özüm . . . 767 Tube-Wall Reactor Modelling for Multiple Reaction Networks with Non-Linear Kinetics and Volume Change • S.K. Goyai, M.N. Esmail and N.N. Bakhshi . . . 776 reduction Kinetics of Fe(III)NTA Chelate by Sulfite • E. Sada, H. Kumazawa, Y. Yoshikawa and K.J. Rudzinski . . . 787 The Inverse Gaussian Density Function as Applied to the Ziegler-Natta Catalysis in the Oligomerization of Ethylene to Linear Alpha-Olefins . . . 792 Kinetics of Methyl Tertiary Butyl Ether Synthesis Catalyzed by Ion Exchange Resin • Adnam M. Al-Jarallah, Mohammed A.B. Siddiqui and A.K.K. Lee . . . 802 Effect of Benzene and Thiophene on Rate of Coke Formation During Naphtha Pyrolysis • Durjyogharan Sahu and Deepak Kunzru . . . 808 Kinetics and Selectivity of Reactions of 1-Alkenes on HY Zeolite. The Influence of Chain Length • J. Abbot and B.W. Wojciechowski . . . 817 Catalytic Reactions of n-Hexane on HY Zeolite • J. Abbot and B.W. Wojciechowski . . . 825 Studies of the Fischer-Tropsch Synthesis on a Cobalt Catalyst. I. Evaluation of Product Distribution Parameters from Experimental Data • B. Sarup an B.W. Wojciechowski . . . 831 Preparation and Characterization of Pt/Silicalite Catalysts with High Pt Loadings • H.A. Rangwala, J.A. Szymura, S.E. Wanke and F.D. Otto . . . 843 Dissolved Oxygen Removal by Combination with Hydrogen Using Wetproofed Catalysts • S. Suppiah, K.J. Kutchcoskie, P.V. Balakrishnan and K.T. Chuang . . . 849 Coal Surface Conditioning for Electrostatic Separation • G. Zhou and J.D. Brown . . . 858 Process Design for Offshore Oil and Gas Production in Cold Ocean Environment • D.C. Sen . . . 864 V-L-S Multiphase Equilibrium in Bitumen-Diluent Systems • Neil E. James and Anil K. Mehrotra . . . 870
Review Coupled Optimization and Evaluation of Phase Equilibria and Thermodynamic Properties of the Benzene-Cyclohexane System • J. Sangster, P.K. Talley, C.W. Bale and A.D. Pelton . . . 881 Articles Hydrodynamics of Liquid-liquid Dispersion in Ejectors and Vertical two Phase Flow • Dibydendu Mukherjee, Manindra N. Biswas and Arun K. Mitra . . . 896 Study of the Hydrodynamics within a Draft Tube Spouted Bed System • Mani C. Matthew, Morris H. Morgan, III and Howard Littman . . . 908 Solids Circulation in a Spout-Fluid Bed with Draft Tube • Franco Berruti, James R. Muir and Leo A. Behie . . . 919 Effects of Anisotropic Scattering of Radiation in Laminar Forced Convection in a Parallel-Plate Duct • J.R. Tsai and M.N. Ozisik . . . 924 Enhancement of SO2 Sorption on Lime by Structure Modifiers • F. Shadman and P.I. Dombek . . . 930 Axial Dispersion Models for Displacement Washing of Packed Beds of Wood Pulp Fibres • N.A. Poirier, R.H. Crotogino and W.J.M. Douglas . . . 936 The Effect of Charged Additives and Heat Pretreatment on the Dewatering of Fuel-Grade Peat • D.G. Cooper, E.R.A. Eccles and J.D. Sheppard . . . 945 Hydrogen Production by the Catalytic Steam Reforming of Methanol. Part 3: Kinetics of Methanol Decomposition Using C18HC Catalyst • J.C. Amphlett, R.F. Mann and R.D. Weir . . . 950 Modeling of Naphtha Pyrolysis in Swaged Coils • Ayalur K. Paramsewaran, Vimal K. Sharma and D. Kunzru . . . 957 Vapor Liquid Equilibrium Data for Alcohol n-Amylamine Binary Systems at 333.15 K. Reduction of the Experimental Data by a Novel Model-Free Method • J.A. Abusleme and J.H. Vera . . . 964 Equilibrium Characteristics for the Extraction of Cobalt and Nickel into di(2-ethylhexyl) Phosphoric Acid • J.A. Golding and C.D. Barclay . . . 970 Prediction of the Thermal Conductivity of Liquids and Liquid Mixtures Including Crude Oil Fractions • Amyn S. Teja and Gilliane Tardieu . . . 980 The Effect of Steam Temperature on the Economics of a Cogeneration Power Plant • R.W. Ham, P.L. Douglas and G. Fulford . . . 987 Notes Gas Holdup in a Bubble Column with Immiscible Liquid Mixtures • N. Bandyopadhyay, P. Ray and B.K. Dutta . . . 995 On the Effect of Particle Size on Heat Transfer in Vertical Upflow of Gas-Solids Suspension • S. Sivakumar, M. Chidambaram and H.S. Shankar . . . 1000 Comparison of Indices for the Scaling and Corrosion Tendency of Water • H.M. Müller-Steinhagen and C.A. Branch . . . 1005 On Boundary Conditions to the Film Model of Mass Transfer in Chemical Absorption • Maciej Starzak and Stanislaw Ledakowicz . . . 1008 Experimental Study of a New Mechanically Resistant Adsorbent • K. Iovtchew, L. Nikolov and D. Elenkov . . . 1013 An Agitated Bubble Column for Use in Potash Flotation • W.H. Karolat and G.A. Hill . . . 1017 Viscosity and Surface Tension of p-Xylene-Ethylacetate Liquid Mixtures • Jyoti Narayan, R.K. Wanchoo, G.K. Raina and G.A. Vani . . . 1021 The Use of the Simplex Method to Characterize Dry Cellulose Acetate Membranes for Gas Separations • A.-Y. Tremblay, A. Fouda, A. Liu, T. Matsuura and S. Sourirajan . . . 1027 On the Numerical Solution of Differential Algebraic Equations • Javier Audry-Sanchez . . . 1031
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