广东11选5走势图

冻干机使用前需要提前进行预冻
作者:上海那艾 浏览:

冻干机利用冷冻干燥技术,即是将含水物质,先冻结成固态,而后使其中的水分从固态升华成气态,以除去水分而保存物质的方法。水有固态、液态、气态三中态相。根据热力学中的相平衡理论,随压力的降低水的冰点变化不大,而沸点却越来越低,向冰点靠近,当压力降到一定的真空度时,水的沸点和冰点重合,冰就可以不经液态而直接汽化为气体,这一过程称为升华。食品的冷冻干燥就是在水的三相点以下,即在低温低压条件下,使食品中冻结的水分升华而脱去。

  众所周知,在首次使用冷冻干燥机时,我们必须对冷冻干燥机各部件进行彻底的清洁。大家都知道不锈钢的部件使用乙醇进行清洗,有机玻璃使用生理盐水进行清洗。冻干机安瓿瓶用超声波清洗机进行清洗,然而在真正操作冷冻干燥机前我们需要做哪些准备工作呢?

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