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 alkaline ammonia analysis bacteria barium bark beaker boiling boric acid brown calcium calculated catechol caustic cent Chem chloride chrome chromic chromic acid Collegium colouring matters compounds contain crystallised dégras determined dilute dissolved distilled water dried dyes ellagic acid employed estimated evaporated excess extract fatty acids fermentation filter filtrate flask gallic acid gallotannic acid gelatin gives glass glucose heating hide hide-powder hide-substance hydrochloric acid ignited insoluble iodine value Journ leather lime liquid liquor liter magnesia method methyl orange mineral mixture neutralised nitric acid obtained organic matter oxidation oxidised phenol phenolphthalein phloroglucol potash potassium powder precipitate present produced pure pyrogallol quantity reaction residue salts sample saponification value shaking skin soap soda sodium carbonate soluble solution substance sulphate sulphide sulphuric acid sumach tannin tanning materials tanning matter temperature thiosulphate tion titrated tube unsaponifiable usually washed waxes weighed yellow
Fréquemment cités
Page 217 - Sample must be dried at a temperature not exceeding 60° and then ground to such a degree of fineness that the entire sample will pass through a sieve of 20 meshes to the inch (linear). 3. Amount of Sample and Proportion of Water for Extraction. — For fresh materials the amount of sample and proportion of water for extraction should be such as to give between 0.35—0.45 grm.
Page 212 - ... 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 216 - 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 217 - ... dry" basis. The tannin in fresh materials should also be reported on the basis of the moisture content of the sample "as received.
Page 212 - 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 33 - 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 213 - Sumach and myrobalans extracts should be dissolved at a lower temperature. Solid extracts shall be dissolved by stirring in a beaker with successive quantities of boiling water, the dissolved portions being poured into a litre flask, and the undissolved being allowed to settle and treated with further portions of boiling water. After the whole of the soluble matter is dissolved the solution is treated similarly to that of a liquid extract. Solid tanning materials, previously ground till they will...
Page 319 - 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 214 - The kaolin must be previously washed with 75 cc of the same liquor, which is allowed to stand 15 minutes and then poured off. Paper 605 has a special absorption for a yellow colouring matter often contained in sulphited extracts.