The antifreeze effect of antifreeze agents on different diesel fuels
Thread Content
The last edit to this post was made by yxh0546 on 2012-8-11 at 07:58. Regarding the effect of antifreeze agents in reducing the pour point of different types of diesel, apart from conducting experiments using small samples in the laboratory, is it possible to determine from various parameters of the diesel whether adding such an antifreeze agent will help lower its cold filter point and pour point? If possible, what indicators should be considered? How to tell?
This indicator is difficult to find, as it is closely related to the quality of crude oil and the processing techniques used. For example, in terms of crude oil quality, diesel produced from waxy crude oil may be relatively less sensitive.
Diesel exhibits a high degree of selectivity toward antifreeze agents. Diesel produced by different refineries varies considerably in terms of the wax carbon distribution in its hydrocarbon composition, due to differences in the properties of the crude oil as well as variations in the processes used to determine the initial and final boiling points of diesel during refining. As a result, the same antifreeze agent may be highly effective in reducing the freezing point and improving the filtration properties of diesel from one refinery but less effective for diesel from another refinery； On the other hand, it has no or only a very weak effect on reducing the cold filter plugging point of diesel from another refinery, and sometimes it even has the opposite effect. The hydrocarbon composition of diesel and the carbon distribution of waxes are the main factors affecting sensitivity to demulsifiers, among which the carbon distribution of waxes is the most significant factor. If the carbon distribution of the wax is not concentrated, with a considerable amount of both low-carbon and high-carbon waxes present, then such diesel has a lower sensitivity to demulsifiers.
4 Under normal conditions: 20%–90% distillation temperature difference > 100°C; 49%–dry point temperature difference > 25°C; dry point > 350°C. The distribution of normal alkanes in diesel should be uniform. Discussions are welcome.
Create a blank diesel carbon distribution chart, focusing mainly on the jitter at the tail end. Feel free to discuss.
It is closely related to the properties of the base oil
Based on the principle by which antifreeze agents reduce viscosity, it is possible to observe the shape and size of the crystals; however, I have not heard of anyone using this method. Those who are interested and have the necessary resources can give it a try