Abstract
However many quantitative experiments have been studied on determination of quantities of paraffin troubled materials in crude oils, they were not enough to decide quantitatively the troubled deposits in statical conditions. The cold point precipitation method was very convenient and practical one, but might be not precise.
In our study, consequently, the cold precipitation and filtration processes were applid at each temperature for the purpose.
In these results, troubled paraffin deposits were scarcely contained in non paraffin crude oils as Sarukawa 7(I), 37(IIa), and were less than one percent even 0°C. In comparison with these, Fukubezawa 6, 23 crude oils have 3 to 8 percents at 5°C.
These deposits were analysed by infrared spectrometer. As the results, it was recognized that the saturated paraffinic hydrocarbons might be gradually increased with lowering temperature. The other way, aromatic compounds might be decreased with lower temperature.
