The Effect of Gum in Gasoline

Laboratory Experiments on Gum-Bearing Gasolines

“…The objection to this determination is that it is equally sensitive to sewage and other usual polluting agents. Still more sensitive is a modification (8) of the permanganate method for oxygen consumed. Thompson and Bonnar have also proposed (12) the measurement of the buffering capacity of sea water as a means •of detection of sulfite liquor.…”

“…These results suggest that the solubility relations in the liquid phase may constitute a factor in the flocculation, dispersion, and settling of pigments. 8. Settling is not a simple function of wetting, since water and polar-nonpolar organic substances, both of which wet the pigment remarkably well, exhibit exactly opposite effects.…”

Determination of gum in gasoline

“…Steam Oven Method (4, 7, 11-16). The technic employed in these experiments resembled that of the Voorhees and Eisinger (14) modification of this method. The samples (50 ml.)…”

“…It has been shown (8) and the observation confirmed in this laboratory that, if nitrogen or carbon dioxide be substituted for air during the evaporation of the gasoline, the results are in agreement with those found when using air; a fact which shows that at least during the evaporation of the gasoline atmospheric oxygen has been without effect. However, it has been the experience of Voorhees and Eisinger (14) with gum residues obtained by the steam oven test that drying in an air oven may sometimes permit the undried residue to take up oxygen and increase in weight.…”

Gum Formation in Gasoline

“…Voorhees and Eisinger (14) showed that gum deposition in the internal combustion engine is due to gum resulting from a previous oxidation of the gasoline. To measure the stability of the gasoline, an accelerated oxidation test was proposed, in which the gasoline is agitated in a closed flask in the presence of oxygen at 100°C.…”