THE STUDY OF HYDROCARBON FUEL VAPOR PHASE DEPOSITS.
Quarterly progress rept. no. 6, 16 Aug-16 Nov 67,
ESSO RESEARCH AND ENGINEERING CO LINDEN NJ GOVERNMENT RESEARCH LAB
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The study of the effect of pure hydrocarbon compounds on the rate of deposit formation was continued. The objective of these studies is to develop an understanding of the effect of jet fuel hydrocarbon composition on the deposit formation process. An extensive study was made of the effect of concentration in an aromatic-paraffin binary blend. This was done with the 1-methyl naphthalene in decane system. Pure 1-methyl naphthalene is more deleterious toward deposit formation than decane, particularly at higher temperatures. However, at low concentrationsi.e. below 60 1-methyl naphthalene reduced the rate of deposit formation of the blend below that of pure decane. Since compounds such as 1-methyl naphthalene would be present in an actual jet fuel at low concentrations, compounds of this type will act as deposit formation inhibitors. A study was made of the effect of adding 10 wt- of various aromatics and naphthenes cycloparaffins to decane. All of the compounds evaluated reduced the rate of deposit formation of the blend relative to that of pure decane. The extent of this inhibitory effect was correlated with the number of benzylic hydrogen atoms present in the molecule. It is believed that these results indicate that these compounds, in general, inhibit deposit formation by their ability to form relatively stable free radicals, which slow down the autoxidative chain reaction system leading to the formation of deposits.