不干胶废弃物热解与燃烧动力学特性

采用热重分析方法对不干胶废弃物(PSAs)进行了热解和燃烧失重分析,并采用Doyle法拟合计算了PSAs热解和燃烧动力学参数。结果表明:当温度低于200℃或高于600℃,PSAs的热解和燃烧失重过程具有性;300~600℃时,PSAs热解过程具有3个失重峰,而其燃烧过程具有2个失重峰。动力学分析结果表明:PSAs的热解是由多阶段复杂的热裂解反应组成,其热解过程可用4个一级反应来描述,随着升温速率的提高热解阶段第1峰区表观活化能降低;而第2、3峰区以及半焦深度裂解阶段的第4峰区活化能逐渐升高;PSAs燃烧过程可用3个一级反应来描述,随着升温速率的提高,PSAs燃烧过程的表观活化能均逐渐降低,并且燃烧表观活化能均低于热解表观活化能。

Characteristics of pyrolysis and combustion of pressure sensitive adhesives wastes

The pyrolysis and combustion characteristics of pressure-sensitive adhesive wastes (PSAs) were investigated by thermogravimetric analysis under nitrogen and air atmospheres. Moreover, the kinetics parameters of both pyrolysis and combustion of PSAs were calculated using the Doyle method. The results indicated that there were similarities between the pyrolysis and combustion of PSAs. However, there existed three weight-loss peaks during pyrolysis and two peaks during combustion for temperatures of 300 to 600℃. The kinetics results showed that the process of PSA pyrolysis consisted of multi-stage cracking reactions, which could be described as four first-order reactions; the apparent activation energy in the first peak scale decreased, while those in the second peak scale, the third peak scale of the pyrolysis, and the fourth peak scale of the semi-coke cracking stage increased with the increase in heating rate. PSA combustion could be described as three first-order reactions in which the apparent activation energy decreased with the increase in heating rate. Furthermore, the apparent activation energies in combustion were lower than those in pyrolysis.