ANALYSIS OF HETEROGENEOUSLY CATALYZED FREE-RADICAL OXIDATION OF PHENOL IN AQUEOUS-SOLUTION

被引:22
作者
SADANA, A
机构
[1] National Chemical Laboratory
来源
INDUSTRIAL & ENGINEERING CHEMISTRY PROCESS DESIGN AND DEVELOPMENT | 1979年 / 18卷 / 01期
关键词
D O I
10.1021/i260069a006
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The rate constants for free-radical initiation, uninhibited and inhibited oxidizability, and relative inhibitor efficiencies were determined in aqueous-phase phenol oxidation by the inhibitor method. The kinetics of free-radical inhibitor consumption, phenol hydroperoxide formation, and kinetic chain length growth were examined theoretically along with their implications. A method of estimating the length of the induction period and a criterion for Critical Catalyst Concentration (infinite length of the induction period—no oxidation) expectation in aqueous-phase phenol oxidation is presented. Another method for estimating CCC from the calculated kinetic chain length (kcl) in the steady-state activity regime is also presented. CCC is directly proportional to kcl and phenol hydroperoxide concentration in solution, and it is shown theoretically that CCC decreases on increasing the free-radical initiation rate constant and on decreasing the liquid-phase parameter and oxygen pressure in phenol oxidation. © 1979, American Chemical Society. All rights reserved.
引用
收藏
页码:50 / 56
页数:7
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