A new method for the analysis of commercial phenols / by S.B. Schryver.

  • Schryver, S. B. (Samuel Barnett), 1869-1929
Date:
[1899 or 1900]
Catalogue details

Licence: Public Domain Mark

Credit: A new method for the analysis of commercial phenols / by S.B. Schryver. Source: Wellcome Collection.

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    for various mixtures of phenol and cresol, and it will he seen that an error of about 0 • 1 in this value can cause an error of about 10 per cent, in the relative proportions of the phenol and cresol. Whilst, therefore, the method gives a fairly accurate estimation of the total phenols present, only a rough approximation is obtainable of the relative pro¬ portions of such mixtures as phenol and cresol, where the difference in the molecular weights is small. Percentage of Phenol. Percentage of Cresol. Hydroxy] Value. 100 0 10*63 90 10 10*49 80 20 10*35 70 30 10*21 60 40 10*08 50 50 9*92 40 60 9*76 30 70 9*67 20 80 9*53 10 90 9*37 0 100 9*26 In the examples of mixtures analysed, the relative proportions taken of phenol and cresol respectively are approximately (a) 20 and 80, (6) 35 and 65, (c) 45 and 55, (d) 20 and 80 per cent. From the “ hydroxyl ” values found, the relative proportions as read from the above table are (a) 10 and 90, (6) 30 and 70, (c) 45 and 55, (d) 30 and 70 per cent. A commercial carbolic acid analysed gave the following result : 1*50 grm. gave off NH3, requiring 15*5 c.c. H2SOj for neutralisation. Hydroxyl value found, 10*33. This corresponds to 80 per cent, phenol, 20 per cent, cresol. Boiling Point of Fractions of Guaiacol. Percentage. 204—205 17*7 205—206 14*6 206—207 11*4 207—208 12*9 208—209 11*3 209—210 6*6 210—211 6*0 211—212 6*0 212—214 5*0 214—216 6*6 Guaiacol from Wood Tar.—Guaiacol from wood tar is a liquid containing a mixture of guaiacol C(iH4 (OH) (OCH3)