Chemical engineering
Print ISSN : 0375-9253
Volume 17, Issue 12
Displaying 1-5 of 5 articles from this issue
  • Eiichi Yanagisawa
    1953 Volume 17 Issue 12 Pages 478-485
    Published: December 01, 1953
    Released on J-STAGE: January 18, 2010
    JOURNAL FREE ACCESS
    (1) Develop. of Happel and Aries's principle.
    (2) Three stages of profit duty.
    (3) Research expense as self-insurance charge in chemical project.
    (4) Economic evaluation of chemical, project.
    (5) About a new formula.
    In the author's opinion such definitions as follows are made: v=(p-pma)(1-t), where v=venture profit, p=project income (b.t.d.), pma=profit duty (b.t.d.);
    and pma is classified into 3 stages, as: pma-1 which bears duty of tax, depreciation (d) and capital interest (i), pma-2 which bears further duty of risk which is specific to the chemical process, and pma-3 which bears 3rd duty of risk comprised in business competition and process obsolescence owing to scientific progress and circumstances of economic base on which business stands.
    The proposed formula (8), used for calculating profit duty, is of a kind which allows condition for salvation, assuming:
    a) Research expense or self-insurance charge of x·1 per year will insure the failure loss of (1-y)·I either totally (z=1) or partially (z=0-1), Hence z is a rate of salvation.
    b) x=u·z·(1-y). rd, where z(1-y)·rd·I=amount of annual salvation income b.t., r=(1+i)n, d=i/[(1+i)n-1], and u is the rate of research expense divided by amount of salvation. i.e., u(=0-1) is a charge rate of insurance.
    c) Equating net probable earning+salvation=r.d., we get,
    Formula
    (8)
    Characteristics of the formula (8) are analyzed.
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  • Study on Molecular Distillation Apparatus.
    Saburo Kamei, Seishi Yoshida, Hajimu Ueha
    1953 Volume 17 Issue 12 Pages 486-491
    Published: December 01, 1953
    Released on J-STAGE: July 09, 2009
    JOURNAL FREE ACCESS
    One of the essential factors which should be taken into consideration in designing and constructing a High Vacuum Chemical Apparatus is the problem of gas exhaustion. We present here a fundamental study on the constitution of an exhaustion system in connection with a Molecular Distillation Apparatus.
    First, taking an oil rotary pump, as an example, we analysed the mechanism of exhaustion of a vacuum pump which is an element of exhaustion system, and then went on discussing the whole operation of said exhaustion system, which is combined, in series, with vacuum pumps and pipes. Using the above results we drew up an Exhaustion System Chart which is intended to make almost every factor of the system clear at a glance. It is hoped this chart will be of use in designing an exhaustion system and in calculating the balance of gas in various operations.
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  • Yoshitoshi Oyama, Shiro Ito, Akio Tomioka
    1953 Volume 17 Issue 12 Pages 492-496
    Published: December 01, 1953
    Released on J-STAGE: July 09, 2009
    JOURNAL FREE ACCESS
    In designing continuous thickeners, the concentration gradient of slurry in the thickeners is assumed to be kept horizontally constant, in any place, but vertically changed. To confirm the propriety of this assumption, we carried out an experiment with magnesium hydrate slurry in a rectangular type thickener in an industrial scale and the following results were obtained.
    (1) Slurry fed in the thickener settles down forming socalled density flow through clear liquid zone and spreads over the stagnant slurry level. By this density flow the return flow towards the feed launder is traced in clear liquid zone.
    (2) The concentration gradient is dept each definite value at various depths throughout the area of the thickener.
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  • [in Japanese], [in Japanese]
    1953 Volume 17 Issue 12 Pages 497-498,509
    Published: December 01, 1953
    Released on J-STAGE: July 09, 2009
    JOURNAL FREE ACCESS
    Download PDF (323K)
  • [in Japanese]
    1953 Volume 17 Issue 12 Pages 506-509
    Published: December 01, 1953
    Released on J-STAGE: July 09, 2009
    JOURNAL FREE ACCESS
    Download PDF (2493K)
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