Development of thermal recycling technology of expanded polystyrene container and its practical application

我们开发的膨胀聚苯乙烯（以下简称EPS）的低温石化方法，使EPS在200℃以下热分解。该方法采用α-甲基苯乙烯单体（MSM）和相同的二聚体（MSD）作为添加剂。加入MSM制得的燃料油（即再生油）粘度较低。澄清了在MSM添加比例一定的情况下，再生油的数平均分子量（Mn）与粘度的关系。特别是当Mn大于5000时，再生油的黏度有所上升和变化。当再生油加热超过60℃时，粘度性能变得不稳定，再生率也降低。因此，有必要在油温低于50℃的情况下，使用Mn: 5000的再生油。此外，将再生油（Mn: 1000 ~ 5000）在MSM中稀释4倍左右，可以获得稠油的粘度特性。虽然大部分的回收油能够燃烧，但当煤油燃烧器燃烧这些油时，一部分回收油是不燃烧的。当回收油在燃烧室燃烧时，燃烧室温度达到1000℃以上，有可能实现回收油的完全燃烧。此外，燃烧室中CO、CO_2、NO_x等燃烧气体的成分与煤油的燃烧情况相似。在未来，开发的EPS低温石化方法将得到实际应用。

The low-temperature petrochemical method of the expanded polystyrene (following, EPS) which we developed enabled EPS thermal decomposition at 200℃ or less. The method used α-methylstyrene monomer (MSM) and same dimer (MSD) as an additives. The viscosity of the fuel oil (following, recycled oil) made by adding MSM was low. The relationship between number average molecular weight (following, Mn) and viscosity of the recycled oil was clarified, when the ratio of MSM addition is fixed. Especially, the viscosity rose and varied, when the Mn of recycled oil was over 5000. And, the recycled oil heated over 60℃, viscometric property became unstable, and the reproductivity also lowered. Therefore, it is necessary to use the recycled oil under Mn : 5000 at its oil temperature 50℃ or less. In addition, it was possible to be the viscometric property as heavy oil by diluting the recycled oil (about Mn : 1000〜5000) at about 4 times in MSM. Though most of recycled oil was able to burn, when the kerosene burner burned this oil, a part of the recycled oil was the un-combustion. The temperature in the combustion chamber became over 1000℃, when the recycled oil was burnt in combustion chamber, and it was possible to be the complete combustion of recycled oil. In addition, the component of combustion gas such as CO, CO_2 and NO_x in combustion chamber was similar to the combustion condition of kerosene. In the future, developed EPS low temperature petrochemical method will be used practically.