Mechanism of action and usage knowledge of diesel pour point depressants

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Under normal circumstances, when fuel is stored in a low-temperature environment for an extended period of time, the paraffin in the fuel will precipitate and form crystals. These crystals continue to accumulate and may even clump together, and the use of such diesel can easily lead to clogging of the filters. Upon the addition of an anti-wax precipitant, its active components introduce repulsive charges between the paraffin crystals, resulting in smaller crystal sizes, a looser structure, and more uniform distribution of the crystals. This prevents the crystals from clumping together, thereby enhancing the effectiveness of the additive in improving the flow properties of diesel at low temperatures. In fact, anti-wax precipitation additives alone cannot improve the low-temperature fluidity of diesel; they are always used in combination with diesel low-temperature flow improvers. A diesel cold filter plugging point improver is a composite material composed of a diesel low-temperature flow improver and an anti-wax precipitation additive in a certain ratio. It can overcome the shortcomings associated with the use of a single product, improve the flow properties of diesel, and achieve a significant reduction in the cold filter plugging point. I have already developed a series of product formulas tailored for different types of diesel. This series of products prevents the formation of three-dimensional network structures of paraffin crystals in diesel due to temperature drops. After adding diesel cold filter plugging agents in proportion, the freezing point can be reduced by 15–35°C, and the cold filter plugging point can be reduced by 10–20°C. Although the quality of diesel produced by various domestic refineries varies, as do the formulations of the flow improvers used with it, in general, the addition of this product series allows the diesel to be upgraded to a higher grade. For example: 0# diesel upgraded to -10# diesel. The cold filter plugging point performance of the diesel flow improver product series is significantly superior to that of similar products at home and abroad. 　　The effectiveness of diesel cold filter plugging point improvers depends not only on the properties of the product itself but also on the characteristics of the diesel: different distillation temperatures ； Different crude oil components (including paraffinic, intermediate, naphthenic, etc.) ； The proportion of diesel from different processing technologies (atmospheric and vacuum distillation, delayed coking, catalytic cracking, hydroreforming, etc.) in finished oils ； All of these will have an impact on the final usage effect.