| 摘要 |
In the temperature-gradient type multistage condenser, a first cooling step is carried out at an outer cooling cylinder storing a freezing mixture. The outer cooling cylinder has an opening at the upper portion thereof and is constructed of double walls having a predetermined space between the walls, a second cooling step is carried out at a vertical pipe disposed substantially coaxially in the outer cooling cylinder, and a third cooling step is carried out at an inner cooling cylinder through which the vertical pipe passes. The cooling capacity is gradually increased as cooling proceeds from the first cooling step, and becomes substantially highest at the third cooling step wherein solvent vapor becomes thin.
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