巻号一覧
11 巻, 2 号
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平野 二郎, 浅原 照三1968 年 11 巻 2 号 p. 94-97
発行日: 1968/02/25
公開日: 2009/01/30
ジャーナル フリーα, α, α, ω-tetrachloroalkanes, prepared from telomerization reaction of ethylene and carbon tetrachloride, were investigated kinetically on their thermalstability in the absence or presence of catalytic materials.
In a glass flask with nitrogen atomosphere, thermal decomposition of tetrachloroalkanes (C5, C7 and C9) became perceptible at about 200°C with the liberation of hydrogen chloride, while catalytic amount (3mol%) of ferric chloride strongly promoted this dehydro-chlorination even at 30∼60°C and 40∼95% of tetrachloroalkanes were decomposed after 30min. of reaction. In both cases, main products of dehydrochlorination were α, α, ω-trichloroalkenes and the velocity of this reaction decreased with increase of the molecular weight of original tetrachloroalkane.
The dehydrochlorination reaction was also promoted by diethyleneglycol succinate which was widely used as the liquid substrate for gas-liquid chromatography. Differential thermal analysis and gaschromatography of tetrachloroalkanes in the presence of the said succinate showed the considerable formation of trichloroalkenes.抄録全体を表示PDF形式でダウンロード (284K) -
Bi-Mo触媒によるブテンの酸化脱水素反応森田 義郎, 西川 瑛一郎1968 年 11 巻 2 号 p. 98-102
発行日: 1968/02/25
公開日: 2009/01/30
ジャーナル フリーThe oxidative dehydrogenation reaction of n-butene to butadiene over Bi-Mo, Bi oxide and Mo oxide catalysts in a flow system at atmospheric pressure has been investigated.
High butadiene yield were obtained over Bi-Mo coprecipitation catalyst at 400∼500°C in excess of oxygen, but higher oxygen content lowered the butadiene selectivity with increase in CO and CO2 formation.
The order of oxidative dehydrogenation over the investigated catalysts can be shown as follows, Bi-Mo(coprecipitation)>Bi2O3+MoO3(dry mixing)>MoO2.76>MoO3>Bi2O3_??_Silica chip.
When oxidation reaction of hydrogen compared with oxidative dehydrogenation of n-butene at the same conditions, it was assumed that oxidative dehydrogenation over Bi-Mo and MoO3 catalysts was not dehydrogenation followed by oxidation of hydrogen.
Oxidation reaction of n-butene over Bi2O3 catalyst may undergo in different mechanism from oxidative dehydrogenation over Bi-Mo catalyst.抄録全体を表示PDF形式でダウンロード (414K) -
功刀 泰碩, 藤元 薫, 酒井 朝也1968 年 11 巻 2 号 p. 103-108
発行日: 1968/02/25
公開日: 2009/01/30
ジャーナル フリーThe cracking of n-dodecane and n-hexadecane over a commercial silica-alumina catalyst was investigated by fixed and fluidized bed reactors, to develop a C3∼C5 olefines production process. An emphasis was placed on the search of the product distribution, particularly of C3, C4 and C5 olefins.
The change of over-all activation energy suggested that the contribution of thermal reaction could be neglected below 520°C in the case of fresh catalyst with high activity and below 470°C in the case of coked catalyst with low activity. The decrease of catalyst activity with process period was roughly represented by the equation k∝τ-m (k: specific rate, τ: process period, m: constant). Product distribution was thoroughly examined. Main products were paraffins and olefins with 3 to 5 carbon numbers. The amount of C2 lighter or C6 heavier was small. From the experimental results a macroscopic reaction scheme was proposed. First, olefins were produced mainly through cracking of feed hydrocarbon. Next, of these compounds branched chain olefines were easily hydrogenated. Small part of straight chain olefines was also hydrogenated, but main part of them isomerized to branched chain olefines.抄録全体を表示PDF形式でダウンロード (458K)
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