RESEARCH RESULTS . . . irnrnediateb available All papers listed are being considered for publication in I&EC or ohe They are available in manuscript form, with the requirement that any reference to their content in a publication must have the author’s prior approval. Orders are processed within 24 hours of receipt, with shipment by first class mail. Prices for I&EC subscribers and nonsubscribers are listed with each manuscript. Please include paymenf with order.
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Separation of Thulium and Ytterbium in Acidic Chloride Solutions by Fractional Solvent Extraction. A correlation based on laboratory data was developed for predicting the total distribution coefficient. This was then used in an extraction calculation for Yb-Sm separation and the results checked by simulated column runs in the laboratory.
~ V o r m a nE. Thomas, Morton Smutz, and Lawrence Burkhart, Iozta State L’niversity Ms. 7 0 - 2 7 3 28 pages ( 8 figures, 3 tables) I&EC Subscribers $6.00 Nonsubscribers $ 1 2.00 Surfactant Adsorption b y Pigments from Aqueous Solution. Describes a simple rheological technique for evaluating the effectiveness of pigment dispersants and discusses the technique in the light of data obtained by chemical and tensiometric means.
Michael A . Kessick, Ian H. M c E i v a n , and Henryk W. Zacharewicz, Canadian Industries Ltd., Canada Ms. 7 0 - 2 8 2 2 4 pages ( 7 figures, 6 tables) I&EC Subscribers $ 6 . 0 0
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r - A l I y -Type Polymerization. Recent advances in pallyl-type polymerization are reviebed, factors influencing the overall activity as well as the stereospecificity of r-allylic catalysts are briefly discussed, and tentative propagation suggested to account for the significant experimental results presently available.
F . D a w a n s and Ph. Teyssie, Instztut Francais du Petrole, France MS.7 0 - 2 9 8 2 6 pages ( 4 tables) I&EC Subscribers $6.00
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Experimental Determination of Catalyst Fouling Parameters. Diffusivities. T h e diffusivities of Ar/He mixtures in fouled catalysts have been measured as a function of carbon concentration. T h e results show that even though the diffusivity decreases, the Thiele modulus is constant as carbon deposition proceeds.
James T . Rzchardson, Esso Research and Engineering Co. MS.7 0 - 3 0 1 1 2 pages ( 4 figures, 1 table) Nonsubscribers $8.00 I&EC Subscribers $4.00
G . R. Youngquzst, J . I. Allen, and J . Eisenberg, Clarkson College of Technology Ms. 7 0 - 2 9 9 2 5 pages (1 0 figures, 2 tables) I&EC Subscribers $6.00 Nonsubscribers $ 1 2.00 Experimental Determination of Catalyst Fouling Parameters. Carbon Profiles. A microcombustion technique has been developed to measure carbon concentration profiles in “coked” catalysts. This information is then used to identify the “coking” mechanism and define certain process parameters.
J a m e s T . Richardson, Esso Research and Engineering Co. MS.7 0 - 3 0 0 1 5 pages ( 6 figures, 2 tables) l&EC Subscribers $4.00 Nonsubscribers $8.00
James J. T a m m a and M a r i o D . Z a d r a , Goodjear Tire G.’ Rubber Co. MS.7 0 - 3 0 7 1 3 pages (1 figure 1 table) I&EC Subscribers $4.00
Conversion in Turbulent Tubular Reactors with Unmixed Feed. Toor’s equations for a w p i d second-order chemical reaction in a turbulent tubular flow reactor, and recent generalized approach of Toor for stoichiometric feed conditions successfully verified by using Monte Carlo coalescence model of Rao and Dunn. Use of M C M suggested to obtain c z as~ a function of y and /3.
D. Phaneswara Rao and Louis L . Edwards, University of Idaho, Moscow MS.7 0 - 3 0 2 9 pages ( 4 figures) Nonsubscribers $4.00 I&EC Subscribers $2.00
Nonsubscribers $8.00
Heterogeneous Potassium Catalyst. Propylene Dimerization. T h e factors affecting activity, selcctivtty, and life for two catalysts, potassium on magnesia and potassium o n alumina, \+ere determined for the piopylene dimeiization process.
James J . Taritma and .Mario D. Zadra, Goodlear Tire 6’Rubber Go. MS.7 0 - 3 0 8 1 2 pages (8 tables) I&EC Subscribers $4.00
Nonsubscribers $8.00
Sulfur Oxidation of Oleflns to Ketones. Ca-Cil linear and cyclic olefins \\ere oxidized to ketones in one step using sulfur as an oxidant. Ketone yields were 40-50 mol yoper pass. Main by-products were mercaptans and sulfides, which were recyclable, thereby bringing the overall ketone yield to 80-90 mol %.
Growth and Nucleation Rates of Ice Produced in a Well-Stirred Continuous Crystallizer. Good agreement is found a t larger crystal sizes between growth rates inferred from effluent particle size distributions measured at subcoolings of 0.02°-0.030C and values predicted from transpoi t rates. Nucleation rates are coirelated with the moments of the particle size distribution.
Shzgeto Suzuki and Derek L. Ransley, Chevron Research Co. Ms. 70.304 2 2 pages ( 4 figures, 5 tables)
G Margolis, P . L. T . Brian, and A . F. Sarojm, .Massachusetts Institute of Technology Ms. 7 0 - 3 0 9 55 pages (1 7 figures, 5 tables)
I&EC Subscribers $6.00 Adsorption of Hydrocarbons b y Synthetic Zeolites. Rate and equilibrium data for adsorption of ethane, ethylene, propane, propylene butane, and butylene on a synthetic zeolite, Davison 5A calcium microtraps were obtained. Equilibrium isotherms were of the Langmuir type. Analysis of the rate data indicates that macropore transport is limiting.
Heterogeneous Potassium Catalyst. Role of the Substrate on the Propylene Dimerization Process. Magnesia, alumina, magnesium silicate, charcoal, molecular sieve, and graphites were evaluated as substrates for potassium catalyst in the dimerization of propylene. These substrates strongly affected the initiation, dimerization, and isomerization steps.
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RESEARCH RESULTS
Permeability of Beds of Ice Particles. Porosities and permeabilities of beds of ice particles produced in a continuous \cell-stirred crystallizer are a strong function of method of bed formation. T h e permeabilities are five to eight times smaller than those obtained from uniform spheres of similar surface to volume ratio.
Geoffrej Margolis and Thomas K . S h e r m o d , sachusetts Institute of Technology
Theoretical Analysis of K Charts. Equilibrium ration charts are traditionally developed empirically from experimental data. A theoretical basis of K charts is established, and the derived equations impose certain limitations on the accuracy and reliability of these charts. Conclusions are supported by experimental data.
Robert D . Gunn, T h e Uniuersity of Texas at Austin Ms. 7 0 - 3 1 1 2 5 pages (5figures, 2 tables) l&EC Subscribers $6.00 Nonsubscribers $ 1 2.00
Electrolytic Production of Aminoguanidine Bicarbonate. T h e electrolytic reduction of nitroguanidine to aminoguanidine has been studied with a rotating cathode of mild steel having a deposit of zinc in a supporting electrolyte of 30% aqueous solution of ammonium sulfate. T h e reduction proceeds with high-current efficiency (85%) and an isolated yield of 80%. T h e results on a 300 A cell are discussed.
T.D . Balakrishnan, K . S. LTduja, G. S. Subramanian, and I
