摘要:

AbstractA study of a non‐conventional dispersed phase crystallizer, whereby the mother liquor feed is dispersed in an immiscible continuous phase and product withdrawn continuously from the agitated 3‐phase slurry is presented. A nucleation mechanism is suggested and relationships which enable an estimate of crystal size, growth rate and segregation effects are proposed. Continuous bench scale experiments indicated that no particular operational difficulties arise, provided the feed is properly dispersed, and verified the anticipated theoretical resu

ISSN:0008-4034    

DOI:10.1002/cjce.5450530201

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractThe ease of decomposing some metal sulfates to oxides and sulfur trioxide is employed in the search for efficient closed cycle thermochemical methods for water splitting. The main features of the new processes are the production of O2through the decomposition of SO2and/or SO3, the production of hydrogen by the decomposition of H2S, reaction of H2S with a metal, reaction of water with a metal, and/or reaction of water with sulfides.

ISSN:0008-4034    

DOI:10.1002/cjce.5450530202

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractThe discharge of chlorinated wastewaters may result in acute toxicity to the aquatic ecosystem. This toxicity is due to chlorine residuals and to chlorinated organics formed during chlorination. An alternative method to chlorination for effluent disinfection is ultraviolet light irradiation. Kills of more than 99% have been obtained for coliform, fecal coliform, fecal streptococci and heterotrophic bacteria by irradiating secondary effluents from conventional activated sludge sewage treatment plants with ultraviolet light (254nm). Laboratory scale treatment studies of ultraviolet sterilization as a method of reducing the toxicity of municipal effluents and producing effluents of acceptable bacterial quality is reported.

ISSN:0008-4034    

DOI:10.1002/cjce.5450530203

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractIt has been shown that the steady‐state conversion of tracers which react with nonlinear kinetics (NLRT) may be used to differentiate complete mixing from macro‐fluid behavior. This paper presents the results of theoretical and experimental studies which have demonstrated that the discriminatory power of NLRT techniques may be greatly increased if unsteady‐state pulse tests with reacting tracers are used instead of steady‐state conversion experiments. The method is shown to be sufficiently sensitive to differentiate among models of mixing which describe the results of inert tracer experiments with equal accuracy. The method was used to identify the position of a plug‐flow element in a plug‐flow mixing‐cell network and to differentiate between a Taylor dispersion system and a plug‐flow mixi

ISSN:0008-4034    

DOI:10.1002/cjce.5450530204

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractTransient behaviour of packed bed reactors for non‐catalytic gas‐solid reactions has been simulated using the sharp interface, finite reaction zone and the particle‐pellet model for the reaction process occurring within the individual pellets. The solution procedures to the system of equations is based on the orthogonal collocation method. The effect of perturbations in the reactor inlet conditions on the temperature profiles encountered in the bed has also been exa

ISSN:0008-4034    

DOI:10.1002/cjce.5450530205

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractPerfluorocyclic oxide is proposed as an antisolvent for studying the behaviour of binary systems by liquid‐liquid equilibrium. The experimental results, obtained for the ternary systems perfluorocyclic oxide — hydrocarbon — propionitrile, are correlated with the NRTL equation. The values of NRTL parameters allow the prediction of the behaviour of ternary systems hydrocarbon A — hydrocarbon B — propionitrile. The use of liquid‐liquid extraction with mixed solvent (perfluorocyclic oxide and propionitrile) is suggested for the separation of hydrocarb

ISSN:0008-4034    

DOI:10.1002/cjce.5450530206

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractSolubilities of propane at atmospheric pressure and for temperatures ranging from —15°C to 70°C are reported for a variety of solvents including hexane and the branch‐chained hexane isomers, for cyclohexane, perfluorohexane, benzene, ethylbenzene, metaxylene, carbon tetrachloride and carbon disulfide. These data, along with data from the literature, are used in comparing solubility behavior of propane and the other paraffin gases in a range of solvents.While predictions of gas solubilities even in non‐polar solvents are still somewhat uncertain, it appears possible to estimate the solubilities of methane, ethane, propane or butane by extrapolation of known solubilities of these gases in a range of solvents. It is also possible to predict the temperature coefficient of solubility in solvents, such as benzene, which yield regular so

ISSN:0008-4034    

DOI:10.1002/cjce.5450530207

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractBenzoic acid diffusivity in water has been determined using the diaphragm cell method, with a flexible and thin “Millipore” filter that leads to a reduction in the time of experiment. Twenty‐two experimental data points are given in the range 10–50°C. Two different correlations are

ISSN:0008-4034    

DOI:10.1002/cjce.5450530208

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractA simple analytical function is proposed for the calculation of molar excess Gibbs energy of binary solutions of strong electrolytes in water. Empirical parameters can be easily determined from experimental data reported in the literature.The treatment is extended to ternary solutions and to solid liquid equilibria using an empirical equation. Absence of solid solutions is assumed.The correlations are applied to the common ion ternary system NaNO3‐NaCl‐H2O in the temperature range from 0 to 100°C.Predictions of activity coefficients of the binary systems and saturation curves of the ternary system are in good agreement with experimental

ISSN:0008-4034    

DOI:10.1002/cjce.5450530209

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY

摘要:

AbstractSeveral aspects associated with the identification and direct digital stochastic control of a steam‐jacketed continuous stirred tank process are investigated. Using data collected under closed‐loop conditions by an on‐line mini‐computer, statistical modelling procedures are used to identify, fit and check a discrete dynamic‐stochastic model for the process and its disturbances. Based on these models an optimal stochastic feedback controller is implemented using the minicomputer. A practical modification of this optimal controller is suggested and the modified stochastic controller is implemented and its performance is

ISSN:0008-4034    

DOI:10.1002/cjce.5450530210

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1975

数据来源: WILEY