Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 23, Issue 3
Displaying 1-7 of 7 articles from this issue
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  • Extension of the Hüttig-type Isotherm Equation on Mixed Gas Adsorption
    Hiroshi UTSUGI, Atsushi ENDO, Noboru SUZUKI
    1986 Volume 23 Issue 3 Pages 145-151
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.145
    JOURNAL FREE ACCESS
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    The Hüttig-type adsorption equation on mixed gas adsorption was derived assuming that the molecules in the 1st layer were localized, and the molecules in the 2nd or higher layers behaved as gases with molecules in a different potential from that of gas molecules. The surface areas were separately obtained by the application of this adsorption equation to the experimental total adsorption isotherms or component adsorption isotherms. The suitability of this equation for the component adsorption isotherms from the mixed gases of O2 and N2 on anatase at 77K was investigated in comparison with that of the extended BET adsorption equation for mixed gas adsorption of the experimental isotherms.
    The suitability showed good agreement in the range of 0.05 and 0.5 in relative pressure. This adaptable range had a wider range than that of the extended BET adsorption equation. The surface areas obtained separately by the adaptation of the equation to the experimental total adsorption isotherms and component adsorption isotherms showed reasonable agreement with those obtained from the adaptation of the Hüttig-type adsorption equation of the single component adsorption for the experimental single component adsorption isotherms. From these results, even in the adsorbed phase of the mixed gas adsorption, the model of the Hüttig-type adsorption equation for mixed gas adsorption was perceived to be much more reasonable than that of the localized model of the extended BET equation for mixed gas adsorption in the relative pressure range of 0.05 and 0.5.
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  • The Optimum Design of a Solid-Solid Reaction System
    Yu Jun HAO, Tatsuo TANAKA
    1986 Volume 23 Issue 3 Pages 152-155
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.152
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    Given a solid-solid reaction system controlled by diffusion, the two variables, i. e., particle size ratio Rr and volume fraction XVA should be specified for the efficient design purposes.
    Based on the reaction model proposed previously, an equation, Eq. (15), correlating the system variables, Rr and XVA in addition to RD, the diffusivity ratio, can be derived for the optimum design condition by equating the times needed for reaching the transition points in both A and B particles. A nomogram is proposed to readily determine the two variables in question.
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  • Measurement of Powder Yield Locus by the Constant Volume Type Direct Shear Tester
    Tomohiro NOMURA, Yoshiki MISAKI
    1986 Volume 23 Issue 3 Pages 156-163
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.156
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    A new constant volume type direct shear test method is described. In this method, the volume of a powder bed is kept constant by adjusting a normal load, and the P. Y. L., containing Y. L. and C. Y. L., can be directly obtained from the observed shearing curve. Then, a shear tester, which has a normal load adjusting device and the on-line data processing system, has been developed. By operating this tester and observing the shear behavior in the powder bed, the suitable sizes of the shear cell and the suitable experimental conditions are determined. When using this cell, it can be proved that the Y. L. and the C. Y. L. connect smoothly on a critical state line. These results show that the P. Y. L. can be exactly obtained from only a Y. L. test and a C. Y. L. test.
    It was shown that this method is available for measuring the P. Y. L.
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  • [title in Japanese]
    Ryoji UTSUMI, Hiroshi YAMAMOTO, Akira KUSHIDA
    1986 Volume 23 Issue 3 Pages 164-167
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.164
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  • [title in Japanese]
    Junji KISHI
    1986 Volume 23 Issue 3 Pages 168-179
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.168
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  • [title in Japanese]
    1986 Volume 23 Issue 3 Pages 193-205
    Published: March 10, 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.193
    JOURNAL FREE ACCESS
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  • Erratum
    1986 Volume 23 Issue 3 Pages 201
    Published: 1986
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.23.3_201
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