酸化第二鉄の塩化水素ガスによる塩化反応に関する速度論的研究
1972 年 88 巻 1013 号 p. 435-440
詳細
1972 年 88 巻 1013 号 p. 435-440
The reaction between ferric oxides and gaseous hydrogen chloride were investigated thermogravimetrically by means of a quartz glass spring thermal balance. When the reactions were carried out at temperatures below 360°C or thereabouts, the weight loss-time curves showed a sigmoid shape. The experimeotal curves could not be expressed by conventional rate equations.
On the basis of a concept of consecutive reaction, the following equation was proposed to analyze the curves:
m*=1-(1-K1t) 3-[(1-K2t) 3-(1-K1t) 3] MFe2Cl6/MFe2O3where m* is the weight loss fraction, t is the reaction time, M is the molecular weight, K1 is the apparent rate constant in the conversion of ferric oxide into solid iron chloride and K2 is the apparent rate constant in the conversion of solid iron chloride into gaseous ferric chloride.
The values of K1 and K2 were obtained from the curves of the above equation and superimposed experimental curves.
It was found that the values of K2/K1 decreased with the lowering of the temperature and that the sigmoid shape became more pronounced in the experimental curves.
