Commercial Turpentines Their Quality And Methods for Their Examination
Commercial Turpentines Their Quality And Methods for Their Examination
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475 is strongly indicative of coal-tar oils and the test should be repeated, distilling a sufficient quantity of the sample to obtain at least 50 cc fractionating below 157 C. (314 F. ), which should be 1 Rosin spirits leaves a small residue on polymerization.
20 COMMERCIAL TURPENTINES.
carefully refractionated, the initial distilling temperature noted, and the refractive index, behavior with sulphuric acid (color, heat devel- oped, refractive index of residue, if any), and odor closely observe...d. An initial distilling temperature of less than 154 C. (309 F. ) with a refractive index of the first fraction of more than 1. 475, together with a reddish color and but little development of heat on mixing with the sulphuric acid, and the characteristic odor of the oils, is proof of the presence of coal-tar oils.
When the proportion of coal-tar oils is small, this examination may not always give positive evidence of their presence. As little as 5 per cent of xylol, however, may be identified by the following procedure: To 150 cc of 4 to 1 sulphuric acid, in a separatory funnel, add 100 cc of the suspected turpentine, being careful to prevent a rise in temperature above 40 C, (104 F.
What to read after Commercial Turpentines Their Quality And Methods for Their Examination?
You can find similar books in the "Read Also" column, or choose other free books by F P Fletcher Pearre Veitch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
475 is strongly indicative of coal-tar oils and the test should be repeated, distilling a sufficient quantity of the sample to obtain at least 50 cc fractionating below 157 C. (314 F. ), which should be 1 Rosin spirits leaves a small residue on polymerization.
20 COMMERCIAL TURPENTINES.
carefully refractionated, the initial distilling temperature noted, and the refractive index, behavior with sulphuric acid (color, heat devel- oped, refractive index of residue, if any), and odor closely observe...d. An initial distilling temperature of less than 154 C. (309 F. ) with a refractive index of the first fraction of more than 1. 475, together with a reddish color and but little development of heat on mixing with the sulphuric acid, and the characteristic odor of the oils, is proof of the presence of coal-tar oils.
When the proportion of coal-tar oils is small, this examination may not always give positive evidence of their presence. As little as 5 per cent of xylol, however, may be identified by the following procedure: To 150 cc of 4 to 1 sulphuric acid, in a separatory funnel, add 100 cc of the suspected turpentine, being careful to prevent a rise in temperature above 40 C, (104 F.
What to read after Commercial Turpentines Their Quality And Methods for Their Examination?
You can find similar books in the "Read Also" column, or choose other free books by F P Fletcher Pearre Veitch to read onlineMoreLess
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