Leather Industries Laboratory Book of Analytical and Experimental MethodsE. & F. N. Spon, Limited, 1908 - 460 pages |
Table des matières
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Autres éditions - Tout afficher
Leather Industries Laboratory Book of Analytical and Experimental Methods Henry Richardson Procter Affichage du livre entier - 1908 |
Expressions et termes fréquents
added alcohol alkali alumina ammonia analysis barium bark beaker boiling boric acid brown calcium calculated catechin catechol catechol tannins caustic cent Chem chloride chrome chromic acid Collegium colouring matters compound contain crystallised detannised determined dilute dissolved distilled water dried ellagic acid employed estimated ether evaporated excess extract fatty acids ferric filter filtrate flask gallic acid gallotannic acid gelatin gives glass glucose gravimetric heated hide hide-powder hydrate hydrochloric acid ignited insoluble iodine Journ leather lime liquid liquor liter magnesia method methyl orange mixture neutral neutralised nitric acid non-tannins obtained oxidation oxidised permanganate phenol phenolphthalein phloroglucol pink portion potash potassium powder precipitate present produced protocatechuic acid pure pyrogallol quantity Quebracho react reaction removed residue salts sample shaking soda sodium carbonate soluble solution substances sulphate sulphuric acid sumach tannin tanning materials tanning matter temperature thiosulphate tion titrated tube turbidity washed weight yellow
Fréquemment cités
Page 210 - ... cm. deep in a beaker placed in a good light on black glass or black glazed paper must appear dark and free from opalescence when viewed from above. Any necessary mode of filtration may be employed, but if such filtration causes any appreciable loss when applied to a clear solution a correction must be ascertained and applied as decsribed in Section VI.
Page 212 - The hide-powder employed shall be of a woolly and not granular texture, thoroughly delimed, preferably with hydrochloric acid, and not requiring more than 5 cc of N/io NaOH or KOH to produce a permanent pink with phenolphthalein on 6J grm.
Page 215 - ... dry" basis. The tannin in fresh materials should also be reported on the basis of the moisture content of the sample "as received.
Page 317 - Prolonged washing beyond a certain limit causes slight dissociation of the acetyl product. This would lead to too low an acetyl value. The acetylated product is then filtered through a dry filter-paper in a drying oven to remove water. The whole operation may be carried out quantitatively, and in that case the fatty matter is treated in a fashion similar to the modus operandi described for the determination of the Hehner value (p.
Page 210 - The total solubles must be determined by the evaporation of a measured quantity of the solution previously filtered till optically clear both by reflected and transmitted light ; that is, a bright object such as an electric light filament must be distinctly visible through at least 5 cm. thickness, and a layer of 1 cm. deep in a beaker, placed in a good light on black glass or black glazed paper, must appear dark and free from opalescence when viewed from above.
Page 214 - In the case of tans it must be clearly stated in the report whether the calculation is on the sample with moisture as received, or upon some...
Page 31 - The results in either case are exact, a fraction of a drop of alkali changing the clear lemon colour to a dirty yellow. If 100 cc of water are used, multiplication of the cc of acid by 5 gives the temporary hardness in parts of CaCO3 per 100,000. The boiling must in no case take place in an ordinary glass beaker or flask, as an amount of alkali is dissolved which may lead to serious inaccuracy. Even hard Jena glass is not free from this effect, though the amount dissolved is so small that for most...
Page 215 - Dilution for Analysis. — Fluid extracts must be allowed to come to room temperature and weighed in stoppered weighing bottle. Such quantity shall be taken as will give from 0.35-0.45 grm.
Page 317 - Titrate the distillate with decinormal potash, using phenolphthalein as an indicator, multiply the number of cc by 5-61, and divide by the weight of substance taken. This gives the acetyl value. (b) Filtration Process. — Add to the soap solution a quantity of standardised sulphuric acid exactly corresponding to the amount of alcoholic potash employed and warm gently, whereupon the fatty acids will readily collect on the top as an oily layer. (If the saponification value has been determined, it...
Page 317 - ... tube reaching nearly to the bottom of the beaker ; this is done to prevent bumping. The mixture is then allowed to separate into two layers, the water is syphoned off, and the oily layer again boiled out in the same manner three successive times. The last trace of acetic acid is thus removed, as may be ascertained by testing with litmus paper.