JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Print ISSN : 0021-9592
Volume 8 , Issue 2
Showing 1-19 articles out of 19 articles from the selected issue
  • TAKASHI KATAYAMA, KAZUNARI OHGAKI, GORO MAEKAWA, MOTOJIRO GOTO, TAMON ...
    1975 Volume 8 Issue 2 Pages 89-92
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    Isothermal vapor-liquid equilibrium data of acetone-carbon dioxide system at 25°C and 40°C and methanol-carbon dioxide system at 25°C were measured with a vapor-recirculation apparatus over a pressure range from 2 to 80 atm.
    Experimental results obtained are analyzed by thermodynamic procedures, and the nonidealities of vapor and liquid phases are compared between these two systems.
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  • HIROSHI SAGARA, YASUHIKO ARAI, SHOZABURO SAITO
    1975 Volume 8 Issue 2 Pages 93-97
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The regular solution theory was applied to predict and correlate Henry''s constants for hydrogen, nitrogen, methane, ethane, and propane in hydrocarbon solvents. As the system temperature is above the critical temperature of the solute, the liquid properties of the supercritical component are hypothetical. In the present paper, a new method is proposed to estimate such hypothetical liquid properties.
    The calculated results represent Henry''s constants fairly well over a wide range of temperature, though a slight deviation remained in the region of very low temperatures and in the region near the critical temperature of the solvent. Thus, it was ascertained that the regular solution theory was applicable to predict and correlate Henry''s constants for nonpolar molecules. The present estimation for hypothetical liquid properties is considered to be adequate for nonpolar molecules.
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  • HIROSHI SAGARA, SHIGERU MIHARA, YASUHIKO ARAI, SHOZABURO SAITO
    1975 Volume 8 Issue 2 Pages 98-104
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The vapor-liquid equilibria of hydrogen-methane-propylene, hydrogen-ethylene-propane, and hydrogen-propylene-propane ternary systems were measured at temperatures from -100° to -25°C and at pressures from 20 to 80 atm. The experimental results agreed with those calculated by the BWR equation except for temperatures below the normal boiling point of the heaviest hydrocarbon.
    By using the vapor-liquid equilibrium data obtained, Henry''s constants for hydrogen in binary hydrocarbon solvents were determined. The nonideality of the solvent mixture was small, so that the regular solution theory was successfully applied to Henry''s constants for hydrogen in these mixed solvents.
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  • KATSUJI NODA, TETSUO MORISUE, KIYOHARU ISHIDA
    1975 Volume 8 Issue 2 Pages 104-108
    Published: April 30, 1975
    Released: March 28, 2006
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    Vapor-liquid equilibrium data are obtained for the binary systems benzene-ammonia and cyclohexene-ammonia at 0°C and 20°C, and for the ternary system benzene-cyclohexene-ammonia at 20°C by a static method. Experimental phase compositions are compared with those calculated by the equation previously reported.
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  • EIICHI KOJIMA, TAKASHI AKEHATA, TAKASHI SHIRAI
    1975 Volume 8 Issue 2 Pages 108-113
    Published: April 30, 1975
    Released: March 28, 2006
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    The behavior of single air bubbles was studied by holding them stationary by downward flows. Two series of experiments, involving undisturbed flow and disturbed flow by an immersed cylinder, respectively, were conducted in the Reynolds number range 2000-5000 and at the equivalent spherical diameter of bubble 0.4-2 cm. In the disturbed flow, the intensity of turbulence was 0.13 and the integral scale was of the same order of magnitude as bubble diameter. And although the bubble shape was changed considerably from time to time by the effect of turbulence, the relative velocity of bubbles was almost the same as in the undisturbed flow. The averaged ratio of the wake region volume to the bubble volume for the two cases was 4.7.
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  • TAHEI TOMIDA, TSUKASA YAMAMOTO, TAMOTSU TAKEBAYASHI, TATSUYA OKAZAKI
    1975 Volume 8 Issue 2 Pages 113-118
    Published: April 30, 1975
    Released: March 28, 2006
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    Experiments were made on the two-phase pressure drop in vertical upward flow. A similar type of correlation for the apparent friction coefficient to that proposed by Rippel et al. was developed to include the physical properties of liquids. In the correlation the apparent friction coefficient is expressed as a function of the ratio of the mass flow rate of gas and liquid and the liquid Reynolds number. It was found that the change in the slope of the correlation curve corresponded to the transition point of the flow pattern. This type of correlation was applied to data from the literature obtained with various geometries of HDW. A correlation between the apparent friction coefficient and liquid film thickness, including wave height, was also proposed.
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  • TAKEHIKO FURUSAWA, MOTOYUKI SUZUKI
    1975 Volume 8 Issue 2 Pages 119-122
    Published: April 30, 1975
    Released: March 28, 2006
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    Moment equations are derived for concentration decay curves of tracer in a well-mixed batch slurry adsorber. This gives relations between the rate parameters for mass transfer and adsorption and the moments of the experimentally measurable curves. The results provide a method for measuring rate parameters in slurry systems. The method is illustrated by evaluating fluid-to-particle mass transfer coefficients and effective diffusivities from experimental data for the adsorption of dodecylbenzenesulfonate in slurries of bone char particles.
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  • KAKUJI TOJO, KEI MIYANAMI, TAKEO YANO
    1975 Volume 8 Issue 2 Pages 122-126
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    Mass transfer characteristics of a multistage vibrating disk column are studied for the extraction of methyl isobutyl ketone-acetic acid-water system.
    The disk vibration definitely increases the mass transfer rate, and in the high vibration range the over-all mass transfer capacity coefficient becomes nearly three times that in the absence of disk vibration.
    The increase in mass transfer rate by disk vibration is mainly caused by the increase in dispersed-phase holdup and the decrease in droplet size, and the resulting remarkable increase in interfacial area.
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  • TADASHI HANO, FUMIYUKI NAKASHIO, KOICHIRO KUSUNOKI
    1975 Volume 8 Issue 2 Pages 127-130
    Published: April 30, 1975
    Released: March 28, 2006
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    Burning rate of coke deposited on zeolite catalyst is evaluated under conditions of chemical reaction control and compared with experimental data reported previously by other investigators. The rate equation obtained in this paper is first order with respect to both coke concentration and oxygen partial pressure. Its activation energy is 26.2 kcal/g-mol, slightly lower than those of other works. Burning rate is approximately independent of the source of coke, but is affected by a certain kind of cation in zeolite.
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  • RYOZO TOEI, KAZUHIRO NAKANISHI, KAZUMASA YAMADA, MORIO OKAZAKI
    1975 Volume 8 Issue 2 Pages 131-136
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The fouling mechanism of the dehydrogenation of n-butane over chromia-alumina catalysts was studied both theoretically and experimentally.
    The reaction experiments were carried out using three kinds of chromia-alumina catalysts of different compositions and it was clarified that dehydrogenation of n-butane was effective only on chromia, whereas coke formation occurred on alumina as well as on chromia.
    The experimental results could be well explained by the dual active site model in which two kinds of active sites on the catalytic surface and a one-to-one correspondence between the number of "molecules of coke" and the number of active sites were assumed.
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  • TETSUO YOSHIDA, YASUO KOUSAKA, KIKUO OKUYAMA, SHIGERU NISHIO
    1975 Volume 8 Issue 2 Pages 137-142
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The behavior of aerosol particles of sub-micron diameter undergoing Brownian coagulation, Brownian diffusion and gravitational settling was studied by numerically solving the equation of population balance and by experimentally observing the change of aerosol properties with time. In calculation, two dimensionless parameters, which are determined by the initial properties of aerosols and vessel dimension in which aerosols are suspended, were introduced to evaluate the magnitude of influence of Brownian coagulation and Brownian diffusion on gravitational settling. The results of numerical calculation were indicated by graphical representation, which is usable for quantitative estimation of the magnitude of these two effects. These computational results were found to be in good agreement with the experimental results obtained by an ultramicroscopic technique of particle size analysis.
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  • KANJI MATSUMOTO, YOSHIRO MORI
    1975 Volume 8 Issue 2 Pages 143-147
    Published: April 30, 1975
    Released: March 28, 2006
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    Buoyant density of floe can be obtained by simultaneous use of Odén balance method and photoextinction method, provided that the relationship between size and settling velocity of floe is known, and that flocculation and redispersion of floes do not occur significantly during settling.
    By use of this method the following result is obtained. Settling velocity of activated sludge and floe formed by bentonite and alum can be represented by a settling velocity equation for solid spheres.
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  • KOHEI OGAWA, SHIRO ITO
    1975 Volume 8 Issue 2 Pages 148-151
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    To express the degree of mixing in chemical process equipment, a new, generally applicable definition of quality of mixedness is presented by making use of the entropy in information theory.
    The newly defined quality of mixedness varies from zero for the complete separate state or "piston flow" to values approaching unity for the final mixing state or the complete mixing state.
    The application of the newly defined quality of mixedness is explained with two types of examples.
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  • KOH YUGE, EIJI O''SHIMA
    1975 Volume 8 Issue 2 Pages 151-156
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The mixing characteristics of high-viscosity liquid in stirred tanks were investigated from measurement of the concentration response curves by injecting tracer in the tanks, and it was confirmed, by comparing the results of the concentration response curves calculated from the circulation time distribution, that the circulation time distribution can be used to predict the concentration response curve that represents the mixing performance. The effect of diffusive mixing was found to be significant in the concentration response curve obtained experimentally, particularly in the case of paddle or turbine impellers in the range of Reynolds number less than 10. The characteristic values of mixing both observed and calculated showed a similar tendency and it was concluded that paddle and turbine impellers are preferable for mixing in the Reynolds number range greater than 20, and helical ribbon and helical screw impellers for less than 20. An attempt was made to correlate the parameters characterizing the circulation time distribution with operating conditions, and a method of estimating the characteristic values of mixing from the parameters of the circulation time distribution was obtained.
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  • SETSURO HIRAOKA, RYUZO ITO, IKUHO YAMADA, KENJI SAWADA, MASAYASU ISHIG ...
    1975 Volume 8 Issue 2 Pages 156-161
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
    The characteristic friction velocity in an agitated vessel is defined, based on the assumption that the flow field is affected by the condition at impeller tip. The velocity profiles are well correlated in terms of the dimensionless variables defined by using this friction velocity. The correlation equations are given for the wall vicinity, potential and impeller regions, respectively. Two of them may be regarded as law of the wall and velocity defect law in agitated vessels.
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  • MITSUYASU HIRANUMA
    1975 Volume 8 Issue 2 Pages 162-163
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
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  • MOTOYUKI SUZUKI
    1975 Volume 8 Issue 2 Pages 163-165
    Published: April 30, 1975
    Released: March 28, 2006
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  • KAKUJI TOJO, KEI MIYANAMI, TAKEO YANO
    1975 Volume 8 Issue 2 Pages 165-167
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
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  • TADATOSHI CHIBA, KENJI TERASHIMA, HARUO KOBAYASHI
    1975 Volume 8 Issue 2 Pages 167-169
    Published: April 30, 1975
    Released: March 28, 2006
    JOURNALS FREE ACCESS
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