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13问答网 > 真空干燥可以替代冷冻干燥吗？

真空干燥可以替代冷冻干燥吗？

2025-03-15 20:37:57

推荐回答（1个）

回答1：

真空干燥是将样品放于真空负压条件下，使水的沸点降低，真空负压条件下，水的沸点降到80℃，60℃，40℃开始蒸发；冷冻干燥跟真空干燥不同，含水物质预先降温冻结成固体，然后在真空的状态下，使水分直接从固体直接升华成水蒸气。真空干燥不可替代冷冻干燥，因为冷冻干燥后，水分升华后，物质剩留在冻结时的冰架之中，干燥后体积几乎不变，呈疏松多孔的海绵状，内表面积大，加水后溶解迅速而完全，几乎立即恢复原来的状态。冻干机将冷阱作为捕集蒸汽的装置。默希科技（MOSI）的实验室冻干机的冷阱温度主要有-50℃、-60℃、-80℃三个档次。冷阱温度越低，冷阱的捕获能力越强，但冷阱温度低，对制冷要求高，机器成本及运转费用相对也高。

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