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S OF KAGAKU KOGAKU RONBUNSHU VOL. 3, NO. 3, MAY, 1977 Effect of OxygenConcentration on Thermal Decomposition of Polystyrene in Fluidized Bed, Hiroki Nishizaki and Kazuo Endoh (Govt. Ind. Development Laboratory, Hokkaido) Kagaku Kogaku Ronbunshu, 3, 219-223 (1977) Thermal decomposition of polystyrene was studied in a batch fluidized bed of 35 mmID under atomospheric pressure, at temperatures ranging from 380 to 55O°C, with gas rate from 0.5 to 4.0 cm/sec, the gas containing oxygen up to 21.0 vol%. The overall reaction rate was found to obey the first-order equation. The distilling rate of liquid product proceeded proportionably to the rate of loss-weight. The result obtained was Rw=dwldd=(kf +k*y°'8)w where Rw: reaction rate by loss of weight method dw/dd w: fractional weight kf, k\: coefficients of rate equation in the inert gas and the gas contained oxygen, respectively y: oxygenconcentration 6: reaction time after the induction period When the y is about 18%and the temperature from 400 to 500°C, the liquid product yield was maximumover 70 wt%. Fixed Bed Catalytic Reactor Simulation for Exothermic Complex Reactions, Kazuo Kondo and Fumiyuki Nakashio (Kyushu Univ.) Kagaku Kogaku Ronbunshu, 3, 224-230 (1977) Benzene oxidation, which is a highly exothermic consecutiveparallel reaction, is carried out in a fixed bed catalytic reactor and the experimental results are simulated with a one-dimensional model. With low inlet temperatures and reactant concentrations, the temperature rise in the reactor is relatively small and the reactor behavior can be simulated well with a pseudo-homogeneous model. As the inlet temperatures and reactant concentrations increase the agreement between experimental and calculated results becomes unsatisfactory. A criterion which has been derived for evaluating the signifiVOL. 10 NO. 3 1977 cance of interphase or intraparticle temperature gradients for a single reaction is applied to the present case. It is found that the criteria can be used effectively for complex reactions. Effect of Optical Density on w-Butyraldehyde Photo-Oxidation, Tadashi Shirotsuka, Masao Sudoh and Hideo Nishiumi (Waseda Univ.) Kagaku Kogaku Ronbunshu, 3, 231-235 (1977) To discuss the influence of optical density on a light-induced chain reaction with biradical termination, photooxidation experiments were carried out on the initial reaction rates with different reactant concentrations of w-butyraldehyde. Efficiency of active radical utilization obtained in the optically dense concentration contrasts with the value derived by the constant diffusion coefficient in constant mixing. The increase of reactant concentration produce a steeper profile of light intensity and almost all of incident light is absorbed in the boundary layer of the vicinity of the incident wall. Thus, the results are fairly well explained by the decrease of overall diffusion coefficient in the high optical density, considering of molecular diffusion in the boundary layer. Carbonization of Goal in Continuous Fluidized Bed, Ikuo Nagashima, Noriaki Yamamoto, Toshitaka Fujikawa, Takehiko Furusawa and Daizo Kunii (Univ. of Tokyo) Kagaku Kogaku Ronbunshu, 3, 236-242 (1977) Carbonization of non-caking coal (Taiheiyo in Hokkaido, mean particle size=350 micron) was carried out in continuous laboratory scale fluidized bed. Yields and composition of produced char, tar and gas were investigated at various levels of both carbonization temperature (440°C-880°C) and coal residence time. The maximumyield of tar was attained at ca. 600°C and the corresponding residence time of coal to complete carbonization was morethan ten minutes. Formation of Thermal NOX in Binary System of NitrogenOxygen, Norio Arai, Tatsuo Higashi, Masanobu Hasatani

Effect of the control of the residence time distribution for aging enzyme by a cascade operation - Michaelis-menten kinetics.