信息详情
真空恒温干燥器与普通干燥器的区别
普通干燥器通常用变色硅胶或无水氯化钙作干燥剂,干燥样品所费时间较长,干燥效率不高,一般适用于保存易吸潮药品。干燥器是磨口…
普通干燥器通常用变色硅胶或无水氯化钙作干燥剂,干燥样品所费时间较长,干燥效率不高,一般适用于保存易吸潮药品。干燥器是磨口的,并涂有一层很薄的凡士林以防止水气进入,开启或关闭干燥机时,应用左手朝里(或朝外)按住干燥器下部,用右手握盖上的圆顶反方向平推器盖。搬动干燥器,不应只捧着下部,而应同时用拇指按住盖子,以防盖子滑落。
真空恒温干燥器也称干燥枪,其干燥效率较高,适用于除去结晶水或结晶醇。但这种方法只能适用于小量样品的干燥,如果干燥化合物数量多,可采用真空恒温干燥箱。使用干燥枪时,先将装有样品的小瓷舟放入夹层内,连接盛有干燥剂(一般常用五氧化二磷)的曲颈瓶,然后用水泵减压,抽到一定真空度时,将活塞关闭,停止抽气。根据被干燥化合物的物质,选用适当的溶剂进行加热(溶剂的沸点切勿超过样品的熔点),溶剂蒸气充满夹层外面,而使夹层内样品在减压和恒定的温度下进行干燥。整个过程中,每隔一定时间应再抽一次气,以保持一定的真空度。(图/文
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中译英:
Vacuum thermostatic drier also known as drying pistol, the drying efficiency is high, suitable to remove the water of crystallization or crystallization alcohol. But this
method can only be applied to small sample drying, if dry compound number, can use a vacuum drying oven. Use dry gun, first with samples of small boat into the interlayer connection, filled with desiccant ( commonly used phosphorus pentoxide ) of the retort, and then use the pump relief, to draw a certain vacuum degree, the piston closes, stop pumping gas. According to the dry compound material, choosing the appropriate solvent heating ( boiling point of the solvent must not exceed the melting point of the sample ), the solvent vapor is outside of the interlayer of the interlayer, samples in vacuum and constant temperature drying. The entire process, at a certain period of time to be drawing a gas, in order to maintain a certain degree of vacuum.

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