回流(英语:Reflux)是一种实验操作,用于液态反应体系。有时反应物或溶剂沸点较低,为了不使物料过快气化而损失,通常在反应容器(常为圆底烧瓶)上方安装冷凝管,这样反应物或溶剂蒸气将遇冷回流入反应容器内。通常在加热时还会加入沸石或使用磁力搅拌加热器搅拌,以防暴沸


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