| 摘要 |
<p>PURPOSE: To prevent the oxidative degradation in qualities of the recovered polystyrene and solvent in a process for reclaiming a used polystyrene foam. CONSTITUTION: A rotating shaft of a heating drum 2 is fixed at a specified position inside a polystyrene tank 1, and a scraper 3 is installed in parallel with the shaft and in contact with the surface of the drum 2. A polystyrene soln. tank 4 wherein a polystyrene soln. prepd. by dissolving a used polystyrene foam in an org. solvent is stored is installed at any desired position outside the tank 1. The soln. is sent from the tank 4 through a soln. supply pipe 6 to a high-pressure pump 5, pressurized, and jetted through soln. jet pipes 7a, 7b, and 7c to the upper part of the surface of the drum 2. A nitrogen supply pipe 8 is installed below the scraper 3, and a gas discharge pipe 9, above the drum 2. A backward-flow prevention valve 10 for discharging is installed on the discharge pipe 9.</p> |
