Hu, S.; Govind, R.; D a h , J. Selective Removal of Metals from Wastewater Using Affinity Dialysis Part. Sci. Technol. 1988,6, i = ith variable j = jth of variable m = related to mass transfer r = rth observation R = ion-exchange resin RA = metal-resin complex U = feed solution V = resin suspensionGreek Letters CY = parameters in ordinary differential system 0 = time domain, s = initial conditions for ordinary differential equations Literature Cited Gas separation by hollow fiber membranes has been modeled by several investigators. However, there are no known reports of experimental verification of the models by direct permeate side measurements along the fiber bore. In this work, a mathematical model was developed and experimentally verified over a wide range of operating conditions for synthetic air and helium-nitrogen mixtures by measuring pressure, flow rate, and concentration profiles on the permeate side of the hollow fiber. Both countercurrent and cocurrent flow patterns are used, and the effect of permeate side radial mixing was examined. In general, the model predictions were found to agree well with the experimental results. sorption, absorption, and cryogenics and has advantages that include low capital investment, ease of operation, low energy consumption, cost effectiveness even at low gas volumes, and good weight and space efficiency (Spillman, Prog. 1950b, 46, 585.A method is proposed for correcting the design of countercurrent separation columns for the impact of axial dispersion effects. After computing the required number of transfer units (NTU) employing conventional procedures based on the plug-flow assumption, the method enables estimation of a correction factor accounting for deviations from plug flow. This factor is used to correct the NTU for such effects. The procedure also works for correcting HTU data that might have been affected by axial dispersion. The method is straightforward and simple to use, and the results agree in simple cases within a few percent with those obtained from a rigorous solution of the model of axial dispersion.
SynopsisIn previous papers, interpenetrating polymer networks were shown to display a cellular structure.The phase domain size of polymer I1 was shown to depend inversely on the crosslink density of polymer I. The present paper presents a semiempirical derivation of equations which show quantitatively the dependence of the phase domain size of polymer I1 on the crosslinking density of polymer I, and also on the interfacial energy and the overall composition. If polymer I1 is linear, the dependence on the molecular weight of polymer I1 is also included. The values of the phase domain sizes so estimated are compared with experimental results. While theory and experiment yield good agreement, the semiempirical nature of the equations must be borne in mind.
SynopsisThe melting behavior of physical blends prepared from low, medium, and high density polyethylene was examined by differential scanning calorimetry. Binary lowhigh and ternary low/medium/high density polyethylene blends showed two endothermic peaks which were attributed to the melting of the lower and higher density components. The percent crystallinity of the blends was calculated according to an additivity relationship using the crystallinity of the pure components. These results compared favorably with an experimental crystallinity measured from the area under the melting curves.
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