I-VDUSTRIAL AND ENGINEERING CHEMISTRY
January, 1927
Table IV-Oil C o n t e n t of S y n t h e t i c Oil-Wax Mixtures CAI.CUI,ATED FOUND Per cent Per cent 2.2 2.0 1.5 1.4 1.0 1.0 0.7 0.5 0.5 0.4 0.2 0.3
I n order to check the method further, and a t the same time to secure some data on the agreement obtainable between different operators, a check determination on regular refinery samples was made in the research laboratory without the previous knowledge of the regular wax inspector. A few typical results are given in Table V.
It should be noted that a very satisfactory agreement was obtained under normal operating conditions. Comparison with Other Methods
SOLI-ES.I-~KDESOF REFRACTION YIETHOD-A comparative test between the “solvent-index of refraction method” and the method described in this paper was made on three different samples. Three separate determinations were made on each sample of wax by both methods. Table VI-Comparison
SAMPLE 1 2 3 a
of Solvent-Index a n d Direct Refractometer Methods“
SOLVENT-ITDEX METHOD DIRECTREFRACTOMETER METHOD Per cent Max. Per cent Max. oil variation oil T ariation 0.613 1.046 0.870
0.14 0.23 0.26
0.47 1.00 0.93
The results (Table VI) obtained by the two methods are practically identical. This agreement would seem to indicate that the per cent oil determined is not merely an arbitrary figure but the actual oil content of the wax. PRESS3fETHoD-Table VI1 gives the results of a comparison of the refractometer method and the press method using the procedure suggested by Committee D-2 of the American Society for Testing -l.laterials.6 Table VII-Comparison
of Press Method a n d Direct Refractometer Method
S.4MPl.E
PRESS REFRACTOMETER METHOD METHOD Per cent oil Per cent oil
-
_-
0.0 0.25 0.24 1.00 0.53
54; C . refined 30 C. refined 50’ C . refined 50’ C. semi-refined 50‘ C. semi-refined
Table V-Per c e n t Oil by Different Operators Routine latioratory Research laboratory 0.
