A Technical Treatise on Soap and Candles; With a Glance at the Industry of Fats and Oils (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1881 Excerpt: ...free from carbonic acid is a necessary condition, if a good product is expected, while only the absolutely required quantity of alkali needed for saponification is used. Rosin Soap By The Cold Process. The quantity of rosin, which is applied to a given quantity of fat, is from 15 to 50 per cent. The more rosin is added to a soap, the more it attains a soft and pasty nature, if the quantity of cocoa-nut oil or other fats is not correspondingly increased. The number of rosin soaps, that is the names by which they are designated, is according to the kinds of fat used, extraordinarily large, and almost every large soap manufactory has its own receipts, after which the favorite soap is made. For the saponification of the rosin suitably concentrated lyes are applied, because they furnish a firmer soap. Caustic soda could be substituted by carbonate of soda, but, for reasons already stated, one cannot well recommend this practice. Rosin and fat are either saponified separately and afterwards stirred together, or the fat is first saponified when the pulverized rosin with the necessary quantity of lye is added to the soap and boiled until all froth disappears. So also of a mixture of 100 kilog. (220 lbs.) rosin, 55 kilog. (121 lbs.) cocoa oil, and 55 kilog. palm oil, a rosin soap may be manufactured in the cold way. These substances are melted together, adding gradually while constantly stirring 100 kilog. (220 lbs.) or 72 litres (19.0 gallons) of a 25 B. soda lye, until it becomes stiff, when it is put in the frames. The frames are now covered up and left to rest until the next day. Transparent Rosin Soap. For the fabrication of this soap Dr. Deite gives the following directions: 80 kilog. (176 lbs.) cocoa-nut oil, and 20 kilog. (44 lbs.) palm oil are saponified wit..