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冷冻干燥,或冻干,是一个将材料冷冻,然后将任何冷冻液体从固体直接升华为气体的过程。该方法经常用来保存食品和药品,因为可以很容易地储存和运输产品,而不需要持续制冷。
此过程需要真空泵,并应根据冷冻干燥机进行规格确定。如果泵的流速过高,蒸汽从冷冻干燥器的冷凝器被带走的速度会过快,从而降低其效率。每次运行后务必清洁冷凝器,以防止冷冻化学物质升华到真空泵中。冷冻干燥机真空泵的耐化学腐蚀要求取决于溶剂的腐蚀性。冷冻干燥机应用需要低于 0.1 mbar 的极限真空力,使用两级旋叶泵或 ChemStar Dry 可达到这样的真空度。
真空泵油可以很快被冷冻干燥机的蒸汽破坏。一旦油被化学性破坏,润滑属性就会下降,真空泵很快就需要维修。
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