胶粉与机油共热解制取炭黑实验研究

Experimental study on carbon black upgrading based on CO pyrolysis of rubber powder and engine oil

针对轮胎胶粉导热性较差、单独热解油气产率低、炭黑品质差等问题,提出将轮胎胶粉与机油共混进行第一次热解,利用热重分析研究机油和胶粉的热失重规律,并探讨热解温度和停留时间等因素对三相产物产率的影响。相比于胶粉单独热解,机油与胶粉共热解失重率大幅增加,油气产率上升,在掺混比为1∶1、温度为600℃、停留时间为60 min时,炭黑、焦油和热解气的产率分别为28%、50%和22%。将第一次热解的产物炭黑与活性氧化铝共混进行第二次热解,在温度为600℃、停留时间为30 min时,挥发分仅为4%,比表面积达109. 75 m2/g,有效改善炭黑的表面结构,提升吸附性能和品质。实验表明,相比于胶粉单独热解,二段热解通过强化热解过程中的热、质传递,可有效解决油气收率低、炭黑品质差等问题。

In view of the poor thermal conductivity of tire rubber powder,low pyrolysis yield and poor quality of carbon black,etc. The first pyrolysis of tire rubber powder mixed with engine oil was proposed. The thermogravimetric analysis was used to study the thermogravimetric law of engine oil and rubber powder. Compared with rubber powder pyrolysis alone,the weight loss rate of oil and rubber powder co-pyrolysis increased significantly,and the oil and gas yield increased. The yield of carbon black,tar and pyrolysis gas were 28%,50% and 22% respectively when the blending ratio was 1∶ 1,the temperature was 600℃ and the residence time was 60 min. The first pyrolysis product carbon black was blended with activated alumina for the second pyrolysis. When the temperature was 600℃ and the residence time was 30 min,the volatile content was only 4%,and the specific surface area was 109. 75 m2/g. The surface structure of carbon black was effectively improved and the adsorption performance and quality were improved. Compared with rubber powder pyrolysis alone,two-stage pyrolysis can effectively solve the problems of low oil and gas yield and poor carbon black quality by enhancing heat and mass transfer during pyrolysis.