Chemical and microscopic investigation of co-pyrolysis of crumb tire rubber with waste cooking oil at mild temperature
Chemical and microscopic investigation of co-pyrolysis of crumb tire rubber with waste cooking oil at mild temperature
复制标题
废旧食用油温和共热解废轮胎橡胶的化学和微观研究
DOI：
10.1016/j.wasman.2018.08.024
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发表时间：
2018-09-01
期刊：
影响因子：
8.1
通讯作者：
Tang, Naipeng
中科院分区：
文献类型：
--
作者：
Dong, Ruikun;Zhao, Mengzhen;Tang, Naipeng
废轮胎橡胶粉在沥青中高温脱硫降解形成近似橡胶/沥青均相体系，有利于提高橡胶沥青的储存稳定性。但脱硫降解后的橡胶沥青加工过程中存在的主要问题是轻组分挥发造成的老化，以及直接利用低闪点沥青造成的燃烧或爆炸。因此，废食用油作为一种安全的介质，脱硫和降解废橡胶粉之前，生产橡胶沥青。研究了废食用油在中温（240-280 ℃）下与橡胶颗粒共热解降解橡胶颗粒的可行性和有效性。通过化学分析和微观分析研究了硫化橡胶的结构变化。结果表明，废食用油热解后，胶粉在废食用油中的溶解度可达60wt%以上，溶解度随温度的升高和油的加入量的增加而增大，在2 h时达到最大值，然后随时间的延长而减小。橡胶烃含量大幅度降低，组分分析和元素分析表明，橡胶烃中碳、氢、硫元素含量明显降低。热解产物表面均匀光滑，无明显橡胶颗粒。橡胶残留物的扫描电镜照片中的凹槽和空腔证明降解的聚合物分子发生脱落。傅立叶变换红外光谱分析表明，天然橡胶在热解过程中发生了碳-硫键、碳=碳键和硫=氧键的断裂，并出现了特征峰。(C)2018爱思唯尔有限公司版权所有
Approximate rubber/bitumen homogeneous system formed by desulfurization and degradation of crumb tire rubber in bitumen under high temperature is beneficial to enhance the storage stability of rubberized bitumen. However, the main problems during the processing of desulfurized and degraded rubberized bitumen are aging caused by volatilization of light components, and burning or explosion due to the direct utilization of low flash point bitumen. Therefore, waste cooking oil was proposed as a safer medium to desulfurize and degrade crumb rubber prior to production of rubberized bitumen. This study focused on the feasibility and effectiveness of the application of waste cooking oil in desulfurizing and degrading rubber particles through co-pyrolysis of them at mild temperature (240-280 degrees C). Chemical and microscopic analyses were performed to investigate the structural changes of vulcanized rubber. Results showed that solubility of rubber powder reached above 60 wt% after pyrolysis in waste cooking oil, which increased with higher temperatures and more of oil, while increased to a maximum at 2 h and then decreased with the extension of time. The rubber hydrocarbon content decreased greatly, and dramatic reduction of carbon, hydrogen and sulfur elements happened according to component and elemental analyses. The surface of pyrolysis product was even and smooth without obvious rubber particles. The grooves and cavities of rubber residues in scanning electron microscopy micrographs proved that shedding of degraded polymer molecules occurred. Fourier transform infrared spectra revealed that breakage of carbon-sulfur, carbon=carbon and sulfur=oxygen bonds took place during pyrolysis, with appearance of natural rubber characteristic peak. (C) 2018 Elsevier Ltd. All rights reserved.