Wax formation in the pyrolysis of polyolefins in a conical spouted bed reactor
Wax formation in the pyrolysis of polyolefins in a conical spouted bed reactor
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DOI：
10.1021/ef020043w
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发表时间：
2002-11-01
期刊：
影响因子：
5.3
通讯作者：
Bilbao, J
中科院分区：
文献类型：
--
作者：
Aguado, R;Olazar, M;Bilbao, J
在450-600 ℃范围内，研究了聚烯烃（低密度和高密度聚乙烯和聚丙烯）在一种新型反应器--锥形喷动床中的热解，并测定了蜡、单个气体产物和重要组分的生成动力学。两种聚乙烯的蜡形成活化能相似（低密度聚乙烯为214 kJ mol（-1），高密度聚乙烯为225 kJ mol（-1）），聚丙烯的蜡形成活化能较低（176 M mol（-1））。由于高的气体线速度，该反应器的特征气-固接触特别适合于选择性地获得蜡（92重量%来自聚丙烯，80重量%来自两种聚乙烯）。用傅里叶变换红外光谱法测定了蜡的组成，结果表明，该蜡的支化程度较低，烯烃含量高于商品蜡。
The pyrolysis of polyolefins (low-density and high-density polyethylene and polypropylene) in a new kind of reactor, a conical spouted bed, has been studied in the 450-600 degreesC range and the kinetics of the formation of wax and individual gaseous products and significant groups of components have been determined. The activation energy of wax formation is similar for both polyethylenes (214 kJ mol(-1) for that of low density and 225 kJ mol(-1) for that of high density) and lower for polypropylene (176 M mol(-1)). The characteristic gas-solid contact of this reactor is especially suitable for selectively obtaining wax (92 wt % from polypropylene and 80 wt 176 from both polyethylenes) due to the high gas linear-velocity. Wax composition determined by Fourier transform infrared spectrophotometry indicates that it is a less branched and that its olefinic content is higher than that of commercial waxes.