巻号一覧
20 巻, 6 号
選択された号の論文の6件中1～6を表示しています
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山内 俊男, 岡 日出男1977 年 20 巻 6 号 p. 476-480
発行日: 1977/06/01
公開日: 2009/01/30
ジャーナル フリーDetermination of total chlorine in phosphoric acid esters by the Wickbold method, the Bomb method and the Sodium alcoholate method was studied and the following conclusions were obtained.
(1) The Wickbold method and the Bomb method are not suitable for the trace chlorine determination because of their difficulties in achieving perfect combustion and the ill effect of phosphoric acid ions produced by the combustion.
(2) The Sodium alcoholate method is effective in the trace chlorine determination, as it is able to treat the relatively large quantities of esters.
(3) An accuracy of the Sodium alcoholate method is shown below with the standard deviation ranging from 2.2 to 4.8.
(4) The commercially available new and used phosphoric acid esters were analyzed by the Sodium alcoholate method, and the results are satisfactory.
(5) This method is very simple and it took only 2hrs to complete the analysis of any single sample, thereby assuring the rapidness and automation of this method.抄録全体を表示PDF形式でダウンロード (414K) -
山崎 康男, 河合 是, 木村 茂1977 年 20 巻 6 号 p. 481-485
発行日: 1977/06/01
公開日: 2009/01/30
ジャーナル フリーThe synthesis and the reaction scheme of cyclohexylphenol (CHPhOH) by hydroalkylation of phenol with nickel catalyst supported on silica-alumina (alumina content 42wt%) were studied under conditions as follows; temperature 180-220°C and hydrogen pressure 20-60atm.
Suitable reaction conditions using 5% nickel supported on silica-alumina were the temperature of 220°C, the hydrogen pressure of 60atm and the reaction time of 70min., in which the selectivities of CHPhOH, cyclohexylcyclohexanon and cyclohexanon were 64.2, 8.5 and 18.1% respectively.
The route of CHPhOH formation was as follows; i) phenol was hydrogenated to cyclohexanol on reduction sites, ii) cyclohexanol migrated to acid sites, and iii) phenol was then alkylated by cyclohexanol on acid sites.
The selectivity of CHPhOH in the hydroalkylation of equimolar mixture of benzene and phenol was lower than that in the reaction of phenol alone, and the reasonable interpretation of this fact was discussed.抄録全体を表示PDF形式でダウンロード (363K) -
メチルジフェニルメタン類の水素化熱分解河合 是, 山崎 康男, 佐々木 真1977 年 20 巻 6 号 p. 486-490
発行日: 1977/06/01
公開日: 2009/01/30
ジャーナル フリーThe kinetics of thermal hydrocracking of diphenylmethane (DPM), tolylphenyl- and xylylphenylmethanes were studied, and the reaction mechanism and the influence of substituents on the cracking behavior were clarified. The reaction rate of DPM was indicated by the equation, r=k1.5•PDPM•PH21/2, and the activation energy was 69kcal/mol. Reasonable elementary reactions were proposed by evaluating kinetic parameters. In the reaction of each methylated DPM, demethylation occurred always in preference to debenzylation and demethylbenzylation.
The rates of demethylation of tolylphenylmethanes and toluene were as follows,
_??_-CH3-CH2-_??_>_??_-CH3-CH2-_??__??_H3C-_??_-CH2-_??__??__??_-CH3
The rates of debenzylation of m- and p-tolylphenylmethanes and 3, 4-dimethyldiphenylmethane were almost similar to the rate of DPM, however those of o-tolylphenylmethane and m- and p-xylylphenylmethanes, which were ortho-methyl-substituted diphenylmethanes, were faster than DPM. The rates of demethylbenzylation of all compounds were comparable to the rate of debenzylation of DPM.抄録全体を表示PDF形式でダウンロード (315K) -
高橋 武重, 児玉 東洋, 渡辺 憲一1977 年 20 巻 6 号 p. 491-495
発行日: 1977/06/01
公開日: 2009/01/30
ジャーナル フリーWhen the reaction of p-xylene was carried out over a silica-alumina catalyst in the temperature range from 460 to 510°C, isomerization, disproportionation and demethylation occurred simultaneously. The activity of the catalyst for each reaction changed with process time.
Assuming that the rate of coke formation is negligibly small, the activity ratio of fouled catalyst to fresh one can be represented by a simple exponential function of process time. Since each coefficient of exponent term in the ratio was different from one another, it was suggested that the activity of the catalyst for those reactions decay selectively. As the calculated deactivation coefficients of the disproportionation reaction were about 2 times as large as that of the isomerization, coke formation appears to have a direct influence on the disproportionation reaction.
The dependency of initial rate constants and the deactivation coefficients on temperature followed an Arrhenius type equation.
When the catalytic deactivation during the reaction of p-xylene occured with process time, the rate constant was given by the following equation;
kj=Akj0exp(-Ekj0/RT)•exp(-Aαjexp(-Eαj/RT)•t)
where A is frequency factor, E activation energy and t process time. kj0 and dj represent the initial rate constant and the deactivation coefficient for the j-th reaction, respectively.抄録全体を表示PDF形式でダウンロード (328K) -
1977 年 20 巻 6 号 p. 533a
発行日: 1977年
公開日: 2009/01/30
ジャーナル フリーPDF形式でダウンロード (31K) -
1977 年 20 巻 6 号 p. 533b
発行日: 1977年
公開日: 2009/01/30
ジャーナル フリーPDF形式でダウンロード (31K)
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