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"Os. 1减压蒸馏的具体操作步骤的想法。",
"减压蒸馏可以降低物质的沸点。 减压蒸馏气体管道接冷凝器，冷凝器后接收集釜。 问题：是不是开启真空阀，达到一定真空度后关闭真空阀，蒸馏体系内为负压，可以蒸馏了，气体蒸发，釜内压力有所增加，然后气体被冷凝为液体，压力又下降，也就是说可以一直维持负压。 而不是一直开启真空阀，否则蒸馏出的气体都被吸走了。",
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