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Absolute Alcohol: Spirit Dried over Potash and Quicklime (Drinkwater)
Strong spirit still holds a few per cent of water. Drinkwater dried it first over potassium carbonate, then over fresh-burnt quicklime, distilling it each time from a water bath at about 82°, until its specific gravity fell to 0.794 at 15.6° (Thorpe, 1912). Keep it away from flames and stoppered: it takes water back from the air.
The picture: our diagram.
中级
About 10 days
说明
1
1
Over potash
Over potash
Let 1 litre of strong spirit stand over 300 g of dry potassium carbonate for 24 hours, shaking now and then. Pour off the spirit.
此步骤所需材料：
乙醇——实验级，95 %1 升所需工具：
碳酸钾（草木灰碱）
带塞玻璃瓶
等臂天平2
2
Over quicklime
Over quicklime
Put the spirit in the retort with as much fresh-burnt quicklime, broken small, as will soak up all of it, and let it stand.
所需工具：
生石灰
玻璃曲颈瓶
研钵与研杵3
3
Distil from the water bath
Distil from the water bath
Stand the retort in a water bath and distil slowly at about 82° into a dry flask.
所需工具：
玻璃曲颈瓶
圆底烧瓶
高壁炖锅
电热板
温度计4
4
Again over fresh lime
Again over fresh lime
Return the distillate to the retort with fresh, dry, powdered quicklime, leave it a week at room temperature, and distil again slowly at 81–82°, keeping air out of the receiver.
所需工具：
生石灰玻璃曲颈瓶圆底烧瓶高壁炖锅电热板温度计5
5
Test and keep
Test and keep
Check the specific gravity at 15.6°: absolute alcohol reads about 0.794. Bottle it at once and keep it tightly stoppered.
所需工具：
比重计温度计带塞玻璃瓶材料
1- 1 升占位符
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