Stearine, a constituent of tallow, is a compound of glyceryl and stearic acid.
Fats are glycerides; that is, combinations of oleic, palmetic, and stearic acids.
Chevreul about 1815, that fats are glycerides or compounds of glycerin with fatty acids, mostly palmitic, stearic and oleic.
He also removes the oleic acid, which is liquid at ordinary temperatures, from the palmitic and stearic acids, mixtures of which solidify at temperatures varying from about 130 deg.
As commercial stearic acid frequently contains undecomposed tallow, as well as various foreign matters, this process is occasionally unsuccessful.
Prepared from palmitin (see next article), by saponification, as stearic acid is prepared from stearin.
It now forms an important secondary product in the manufacture of stearic acid.
Another method for the preparation of commercial stearic acid is that of Messrs Moinier and Bontigny.
The addition of the carbon disulphide may be made either before or after the cold pressing of the stearic acid.
Tallow converted into stearic acid by saponification is readily hardened and bleached, if moderately pure.
Repeatedly dissolve and crystallise commercial stearic acid in hot alcohol, until its melting point becomes constant at not less than 158 deg.
This product is a more or less impure mixture ofstearic acid and other fatty bodies, particularly the so-called margaric acid, now generally regarded as a mixture of palmitic and stearic acids.
This term was formerly applied to a mixture of palmitic and stearic acids, produced by decomposing the alkaline soaps of solid fats with an acid, but it is now given to a fatty acid which can only be obtained artificially.
The patentee employs carbon disulphide to increase the fluidity of the oleic acid, so that the warm pressure of the crude stearicacid is avoided.
These can be separated from each other only by the agency of alcohol, which holds the margaric acid in solution after it has deposited the stearic in crystals.
The cakes of stearic acid thus freed completely from the margaric and oleic acids, are subjected to a final cleansing in a tub with steam, and then melted into hemispherical masses called blocks.
This decomposition is founded upon the principle, that the stearic acid transforms the salt into a bicarbonate, which is decomposed by the ebullition.
The preceding numbers will serve to regulate the manufacture of stearic acid for the purpose of making candles.
The purified bi-stearate being decomposed by boiling in water along with any acid, as the muriatic, the disengaged stearic acid is to be washed by melting in water, then cooled and dried.
When tallow is added, as in Great Britain, the object is to produce white and somewhat solid grains of stearic soap in the transparent mass, called figging, because the soap then resembles the granular texture of a fig.
When heated in the open air, and kindled, stearic acid burns like wax.
The pressed cakes are now subjected to the action of water and steam once more, after which the supernatant stearicacid is run off, and cooled in moulds.
One of the higher alcohols of the methane series, homologous with ethal, and found in small quantities as an ethereal salt of stearic acid in spermaceti.
It was formerly supposed to be an individual fatty acid, but is now known to be simply an intimate mixture of stearic and palmitic acids.
Fats of the third order, the stearic group, are called "saturated" because they have taken up all the hydrogen they can hold.
It is claimed that by this method oleic acid is completely transformed into stearic acid, and that the melting point of tallow fatty acids is raised thereby about 12° C.
Stearic acid is also formed by treating oleic acid with fuming hydriodic acid in the presence of phosphorus, while other solid acids are obtained by the action of sulphuric acid or zinc chloride on oleic acid.
Cacao butter Medullic and margaric acids, which were formerly included in this series, have now been shown to consist of mixtures of stearic and palmitic, and stearic palmitic and oleic acids respectively.
The weight, less the amount of stearicacid or beeswax added, multiplied by 20 gives the percentage of fatty acids.
Stearic and oleic acids are more suitable for the purpose, but oleic acid has the disadvantage that oleates are very liable to go rancid.
This acid in composition and general properties was very similar to that obtained by freezing the naphtha solution of the oil, and is probably a mixture of stearic and palmitic acids.
The acid obtained from the first fractionation had the melting point at 75°-76°, indicating an acid either in carbon then stearic or palmitic acids.
The first on examination proved to be a mixture of palmitic and stearic acids existing uncombined in the wool oil.
The following table gives the names of a few of the more common fatty acids and their corresponding fats: Stearic acid Stearin Palmitic acid.
The particular fat that is formed takes its name from the acid which enters into its composition; thus stearic acid unites with glycerin to form the fat stearin.
Several fatty acids can be present in lecithin from various sources: palmitic and oleic acid, besides the stearic acid which at first had been thought the only one involved.
One of them was the glycerophosphoric acid of Pelouze, the second was the well-known stearic acid of Chevreul, but the third was somewhat mysterious.
I suppose you might use it in the proportion of one to four of parawax, but very little stearicacid will harden it.
If you wish to make the parawax harder for the southern sun put in stearic acid.
These latter are held in position through the double play of the jaws, B, while the stearic acid is flowing into the upper part of the moulds.
This operation having been accomplished, the piston table is lowered, and the machine is ready to receive the stearic acid.
Concrete primed with an 8% solution of stearicacid and rosin dissolved in benzine.
Lastly, if the tube be let down until it touches the wick, then little but stearic acid condenses in the flask.
Defn: One of the higher alcohols of the methane series, homologous with ethal, and found in small quantities as an ethereal salt of stearic acid in spermaceti.
Chemically, it is a compound of glyceryl with three molecules of stearic acid, and hence is technically called tristearin, or glyceryl tristearate.
Defn: A salt of stearic acid; as, ordinary soap consists largely of sodium or potassium stearates.
This is made by the action of concentrated sulfuric acid upon a solution of oleic acid or stearic acid in an aromatic hydrocarbon.
Should the fatty acids not readily congeal a weighed amount of dried bleached bees-wax or stearic acid may be added to the hot mixture.
The titer of a fat or oil is really an indication of the amount of stearic acid contained therein.
If a cooled sample bites the tongue morestearic acid is added until there is a 3% excess of this.
Likewise the melting point of stearic acid is lowered by the addition of a small amount of palmitic acid.
Second--Control the N/40 stearic acid with the above alkali to obtain its factor, e.
This insolubility of the aniline colours in paraffin has been suggested as a test for the purity of this hydrocarbon, and of its freedom from stearic or other fatty acids.
They are generally adulterated with stearicacid or hard white tallow.
Wax candles are now seldom moulded, but if so the same processes are followed as for stearic and paraffin candles.
Hardened gypsum treated with stearic acid, or paraffin, and polished, is used as a substitute for meerschaum, which it much resembles.
Stearic acid, however, is a solvent for them, and accordingly when the candles are tinted with the coal-tar colours these are previously dissolved in the stearic acid, always mixed with the paraffin.
Occasionally the spermaceti candles are cast without any admixture of wax, the moulds being raised to a higher temperature just as with stearic acid.
The stearine contains the stearicand margaric acids, which, when separated, are solid, and used as inferior substitutes for wax or spermaceti candles.
Stearic candles, the invention of the celebrated Guy Lussac, are manufactured solely from mutton-suet.
One or two grammes of stearic acid are added to the alcoholic acetic acid, and the clear supernatant liquid used for the experiments.
The wool suint consists largely of the potash soaps of oleic and stearic acids.
The former is composed of the potash salts of fatty acids, principally oleic and stearic acids; the latter of the neutral carbohydrate, cholesterine, with other similar bodies.
Stearic acid remains undissolved upon treating sulphate of quinine with acidulated water.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "stearic" in a variety of sentences. We hope that you will now be able to make sentences using this word.
