This reaction is an industrial process for hydrolyzing fats and oils into fatty acids and glycerol, which is generally carried out in a loosely closed wooden, lead‐lined or acid‐resistant vat where the mixtures of fats or oils, water, sulfuric acid, and sulfonated mixture of oleic or other fatty acid (e.g., stearylsulfonic acid) and naphthalene are boiled for 36–48 h using open steam. The process is often repeated, and the glycerol solution is drawn off after each stage; the fatty acids produced are used for soap, while glycerol is primarily used for explosives (i.e., glycerol dynamite). In the literature, this process is generally known as the Twitchell process. The study finds some limitations of this process. This process has been used to produce fatty acids for soap and glycerol for explosive but has not been currently used.