| 摘要 |
<p>PURPOSE:To purify the subject thermally cracked oil of a styrene resin into an oil having a high purity of styrene monomer by heating and vaporizing the thermally cracked oil of the styrene resin, then passing the produced gas through a cooling pipe kept at a specific temperature, dropping the liquefied component into a heating furnace and then refluxing the liquefied component in the thermally cracking furnace. CONSTITUTION:A styrene resin such as expanded styrene resin is thermally cracked to prepare a thermally cracking product oil 2 composed of a brown oil. The resultant thermally cracking product oil (raw material converted into the oil) 2 is then pressed from a pipe 3 into a thermally cracking furnace and sealed with a stopper. The thermally cracking product oil is subsequently heated at 400 deg.C with a heater 4 and vaporized. The vaporized gas is then passed through a cooling pipe 5 kept at a temperature below 350 deg.C and the liquefied component is dropped into and refluxed in the thermally cracking furnace. The vaporized gas emerging from a pipe 7 is cooled and condensed with a water-cooled heat exchanger 8 to purify the thermally cracking product oil into a colorless, transparent and odorous low-boiling oil composed of a hydrocarbon oil with a high styrene monomer content.</p> |
