水不溶物，insoluble residue，insoluble sludge，是指盐类矿产中包含于固体盐层及卤水内的不溶于水的杂质。
提出一种测定原盐中水不溶物含量的新方法。
A new method to determine insoluble substance in raw salt is presented.
延长碱化时间，产物中水不溶物含量下降，之后趋于稳定；
The insoluble product reduces at initially and then keeps stability later with the time of basification extending.
最终的生物燃料不仅要是一种高能量的水不溶物，而且沸点也要高于乙醇。
The resulting biofuel is not only energy-rich and water repellent but it also has a higher boiling point than ethanol.
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