Wood Products, Distillates and ExtractsScott, Greenwood & son, 1921 - 357 pages |
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Common terms and phrases
100 kilogrammes acetate of lime acetate of soda acetic acid acetone amount analysis apparatus autoclaves bark bisulphite boilers boiling calcium chloride carbonate carbonisation Catechu cent charcoal chestnut extract chestnut wood chips chloride chrome colour column condensed water contains cool copper crystallisation decanted decolorised density dissolved distilled water dyeing evaporation filter filtration flask France furnace gallons gases grammes heat industry infusion juice kilogrammes leather liquid litres logwood manufacture method methyl alcohol milk of lime mixed non-tannin obtained olive oil residuum oxalic acid palmetto extract passed pipe plant potash precipitate pump pyroligneous pyroligneous acid pyrolignite of lime quantity quebracho quebracho extract rectified residue retort saline matter salt skins sodium soluble solution square metres steam sulphate sulphuric acid sumac TABLE tannery tannic acid tannin tanning material temperature tion tons treated tube utilised vapours vats vessel washed weight whilst wood-spirit yield
Popular passages
Page 331 - 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 332 - A further portion is now filtered in the exact method for which the correction is required (time of contact and volume rejected being kept as constant as possible) and 50 cc is evaporated to determine
Page 331 - ... hours, so as to extract the maximum of tannin. Any remaining solubles in the material must be neglected, or reported separately as " difficultly soluble
Page 106 - Aniline when pure is a colorless liquid, very astringent, having an aromatic .odor, and an acrid burning taste. It is slightly soluble in water, and very soluble in alcohol and ether. Its sp. gr. = 1-028 ; at — 20° it does not freeze. It boils at 182°, and distils unchanged. When warmed it dissolves sulphur and phosphorus. It is a powerful base, combining with acids to form salts, which in general are soluble. It decomposes ferrous and ferric salts, and the salts of zinc and...
Page 334 - ... as shown by the direct estimation, but it is desirable that in addition efforts shall be made, by determination of acids in the original solution and in the non-tannin residues, to ascertain the amount of lactic and other non-volatile acids absorbed by the hide powder, and hence returned as
Page 334 - 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 arbitrarily...
Page 334 - The whole is corked up and agitated for 15 minutes in a rotating bottle at not less than 60 revolutions per minute (7).
Page 332 - ... equally accurate, and often more convenient, is to filter a portion of the tanning solution through the Berkefeld candle till optically clear, which can generally...
Page 338 - All evaporations and dryings shall be conducted in the form of apparatus known as the "Combined Evaporator and Dryer" at a temperature not less than 98° C.