Oil pour point issue
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For example, when two oils with different pour points (but with roughly the same boiling range) are mixed together – such as a naphthenic oil with a pour point of -60°C and a paraffinic oil with a pour point of -30°C – and these two oils are combined in a 1:1 ratio, which one’s pour point will be more predominant in the mixture? Why?
This post was last edited by qugd on 2015-6-5 at 13:15. For the pour point to be reached, there must be a sufficient amount of condensable components in the oil. Due to the miscibility of petroleum hydrocarbons, the proportion of waxy-type condensable components that precipitate decreases when they mix with naphthenic-type components. However, since the temperature at which the pour point is reached is lower than that for waxy-type components, the amount of condensable components that precipitate increases accordingly; this degree of decrease depends on the composition of the oil. In my opinion, the pour point of the blended oil is likely to shift toward the pour point of the paraffin-based oil compared to the average value, but it’s difficult to determine by how much. For example, around -42 degrees.
Thank you. Then let’s ask another question: if two types of oils are mixed together in different proportions, for example at a ratio of 1:9 to 9:1, and 9 samples are prepared in this way, will their pour points follow a certain pattern? In other words, will the pour points of those oils with lower pour points increase in order from lowest to highest, or isn’t there necessarily any fixed pattern? But when the oil with a higher pour point constitutes a larger proportion, its pour point will be relatively higher! Could such a pattern emerge?
You can conduct research in this area based on your own ideas, and after obtaining results, you can publish them. You have already designed the content for the experimental study – why not simply carry out such experiments? It’s a good direction for an experiment.
I’m working on it; it’s just that I feel the results don’t match what I expect, which is why I have doubts! Let’s share the test results once they’re available!
There is definitely a deviation from the theoretical calculated value, with a tendency toward paraffin-based behavior, which is related to the paraffin content. 1:9 to 9:1 will be regular but not in proportion.
The actual results lack regularity, and some of the deviations are quite large; I plan to try a different experimental method