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Volume 49, Issue 8
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[in Japanese]1970 Volume 49 Issue 8 Pages 579
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (134K) -
Yuzo Sanada1970 Volume 49 Issue 8 Pages 580-591
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe laser light, plasma jet and electro discharge-generated excited species bring the new methods of coal gasification. Coal irradiated with laser light can produce gases rich in acetylene. The acetylene to methane ratio is relating to the light flux at the surface temperature of the decomposing coal. The high temperature and rapid quenching by use of plasma jet make also production of gases rich in acetylene. The acetylene content of gas was increased with the presence of hydrogen-argon.
Pyrolysis of coal in microwave discharge yields gaseous products containing hydrogen, carbon oxides, and hydrocarbons, with acetylene as the main hydrocarbon. The rate of gas evolution and the distribution of fragments depend on the initial presence of argon, water vapour and hydrogen. An interaction of glow-discharge generated excited hydrogen species with coal delivers methane and carbon mono-oxide as major products. Minor products of saturated hydrocarbons come through the reaction between excited hydrogen species and non-aromatic precursor structures in coal.View full abstractDownload PDF (1438K) -
Plutonium Production and it's UtilizationMasao Yamazaki1970 Volume 49 Issue 8 Pages 592-602
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSYNOPSIS: -Recently, it seems that peaceful use of neuclear energy is fairly under way, because light water reactor type power station are increasing and advanced thermal reactors, fast neutron breeding reactors are being developed.
Fuels of these reactors are made of uranium and another fissile materials.
In natural uranium, only about 0.7% U-235 can be fissinable but another 99.3% U-238 cannot.
But U-238 captures thermal neutron in reactor and converts itself into plutonium-239 (Pu-239).
It is called “fuel reprocessing” to recovery this plutonium from spent fuel, and cyclic utilization of it for fuel is called “neuclear fuel cycle”.
Plutonium is used for fuel for many kind of reactors. For instance, it is used to the substitute of U-235 for low enriched uranium fuel to light water reactors, and it can be used to plutonium-self sustaining to advanced thermal reactors.
Also, plutonium is very important for fuel of fast neutron breeding reactors which is called “perfect reactor.”
It is not too much to say that future prowth of geaceful use of neuclear energy is controlled by utilization of plutonium for neuclear fuel.View full abstractDownload PDF (1470K) -
Yoshio Kamiya1970 Volume 49 Issue 8 Pages 603-613
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFormation of hydroperoxide by means of autoxidation of hydrocarbons and epoxidation of olefins in the presence of metal catalysts were reviewed. The yield of hydroperoxides in the autoxidation of hydrocarbons can be calculated by the equation: Y=1-2kt (-dO2/dt) /k2p (RH) 2. However, induced decomposition of hydroperoxide, especially non-radical decomposition reduces the yield of hydroperoxide.
Epoxidation of olefins with hydroperoxide proceeds almost quantitatively in the presence of heavy metal catalysts such as Mo-or W-salts at about 100°C. The mechanism of this reaction can be understood as an addition reaction of electrophilic oxygen to olefinic double bond on the basis of various effect of reaction conditions.
Commercial process on the epoxidation of olefins by hydroperoxide should be studied from the by-product utilization point of view.View full abstractDownload PDF (1238K) -
Crystalline SubstancesTsuneo Yoshii, Futoru Yoshimura1970 Volume 49 Issue 8 Pages 614-621
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe n-hexane soluble portion of γ-fraction was obtained from Oyubari coal (85.9%C). The following solid substances were separated from the n-hexane soluble portion.
Methyl derivatives of picene (0.3% coal) were obtained by evaporating the n-hexane solution and the gelchromatographic fractionation of n-hexane extract and the separated methyl derivatives of picene were confirmed to be the mixture of some of mono-, di-, tri-, and tetramethyl picene by their IR-, UV-, NMR-, mass-spectra, ultimate analyses and melting points. The mixtures of n-paraffines of C24 to C30 (1.4×10-4% coal) were obtained by the gelchlomatographic fractionation of the n-hexane extract and were confirmed by their IR-, NMR-, mass-spectra, ultimate analyses and melting points.View full abstractDownload PDF (844K) -
Gelchromatographic Fractionation of Liquid MaterialsTsuneo Yoshii, Futoru Yoshimura1970 Volume 49 Issue 8 Pages 622-628
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe gelchromatographic fractionation was carried out for two fractions (Ca. 0.59% coal) which were distillated from the n-hexane soluble portion of γ-fraction obtained from Oyubari coal (85.9%C) under reduced pressure and whose mean molecular weight were 185 and 225.
The measurement of ultimate analyses, IR-, UV-and NMR-spectra were made for respective fractions separated from the distillates by the gelchromatograph.
It was found that the earlier fractions were the mixture of n-paraffines whose mean number of carbon were 13 or 16 and the later fractions were more rich in aromatic hydrocarbons whose aromatic nucleus was supposed to be two or three condensed aromatic rings. Some of aromatic nucleus were inferred to be condensed with naphthenic ring.View full abstractDownload PDF (749K) -
1970 Volume 49 Issue 8 Pages 635-641
Published: August 20, 1970
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (883K)
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