The book presents a comprehensive overview of the technical processes and chemical principles involved in industrial soap production during the early twentieth century. It begins by examining the chemical constitution of oils and fats, detailing their saponification and hydrolysis through heat, enzymes, and chemical reagents like sulfuric acid and Twitchell's reagent. The text classifies the primary raw materials used in the industry, including various tallows, vegetable oils, waste fats, and less-known regional fats, alongside alkaline agents and salts.
Subsequent chapters focus on the practical treatment and bleaching of these raw materials using agents such as potassium bichromate and caustic soda lye. The core manufacturing processes are thoroughly detailed, distinguishing between direct combination, cold-process soaps, soft soaps, hydrated and marbled soaps, and standard boiled hard soaps. The operational sequence of pasting, graining out, boiling on strength, and fitting is analyzed in depth to explain how impurities are separated and nigres utilized.
The work also covers specialized production methods for transparent and electrical soaps, followed by extensive procedures for treating settled soap through framing, slabbing, barring, piling, and drying. Later sections address the specific formulations and requirements for toilet, medicated, and textile soaps used in wool, cotton, and silk industries. Finally, the text provides an extensive catalog of essential oils and synthetic perfumes, details glycerine manufacture and purification via vacuum evaporation and distillation, and concludes with precise analytical methods for raw materials, soaps, and glycerines.
