KINETIC MODEL OF THE PROCESS OF POLYCONDENSATION OF CONCENTRATED PHENOLS OF COAL TAR WITH FORMALDEHYDE

被引：0
|
作者：
Gubnka, Volodymyr [1 ]
Demchuk, Yuriy [1 ,2 ]
Drapak, Iryna [2 ]
Korchak, Bohdan [1 ]
Bratychak, Michael [1 ]
机构：
[1] Lviv Polytech Natl Univ, 12 SBandery St, UA-79013 Lvov, Ukraine
[2] Danylo Halytsky Lviv Natl Med Univ, 69 Pekarska St, UA-79010 Lvov, Ukraine
来源：
CHEMISTRY & CHEMICAL TECHNOLOGY | 2023年 / 17卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
phenol formaldehyde resins; novolac; hydrochloric acid; kinetics;
D O I：
暂无
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Phenol formaldehyde resins were obtained by polycondensation of concentrated phenols with formalde-hyde in the presence of hydrochloric acid. Concentration of phenols is carried out by treating the phenolic fraction of coal tar with an aqueous solution of sodium hydroxide followed by neutralization of water-soluble phenolates with hydrochloric acid. The kinetic dependences of resin yield and softening temperature on the duration of the process at 333, 353, and 373 K were obtained. The order of the reaction was determined and the effective activation energy of this process was determined by a graphical method. In the interval 333-373 K for polycondensation reactions, the equation of the dependence of the resin yield on the temperature and duration of the process was obtained
引用
收藏
页码：339 / 346
页数：8
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