If so, continue acetone boils until acetone until it decants clear without adulterant precipitating with the addition of water.
如果有，嘉许用丙酮煮沸直到上清液澄清并且加入水后不产生假性沉淀。
there are two cuts so distant that they even leave different residues (decants) for the two.
这两种切割距离如此远，以致于它们甚至留下两个不同的遗迹。
If the product decants, the pump must be cleaned so that it can then be restarted without damage.
如果产品停止生产（不知道翻译得对不对），泵必须清洁好从而让它以后无损害地重启。
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