soluble soap

sol·u·ble soap

any soap made with potassium, sodium, or ammonium hydroxide: ordinary animal soap, Castile soap, green soap, etc.
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In alkaline conditions, such as in kraft pulping, the triglycerides are completely saponified, and the free fatty acids and resin acids are dissolved, but sterols and some steryl esters and waxes do not form soluble soap and tend to deposit and cause pitch problems.
Saponification (the formation of a soluble soap through the reaction of an alkaline material and a fat soil) may occur.
High alkalinity products saponify fats and vegetable oils into soluble soaps.

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