Pour Point Depression of Lubricating Oils

Preparation and Evaluation of Some Terpolymers as Lube Oil Additives

“…These depressants abstract the lateral crystal growth as a result of their adsorption on the precipitating wax. [20][21][22] The different concentrations of prepared compounds were tested as pour point depressants ranging from 3.0 to 0.25 wt% and the experimental data indicates that the prepared compounds are efficient as pour point depressants and the efficiency increases by decreasing concentration of additives. This is explained by the solvation power of the oil.…”

Synthesis and evaluation of ethoxylated polyesters as viscosity index improvers and pour point depressants for lube oil

“…An addition of a pour point depressant in conjunction with the dewaxing is the most favored technique in lowering the pour point. These depressants obstruct the lateral crystal growth as a result of their adsorption on the precipitating wax [39,40]. The prepared compounds were tested as pour point depressants (PPD).…”

“…Most oils contain some dissolved wax, which begins to separate as crystals that interlock to form a rigid structure, which traps the oil in small pockets. Such wax crystals formed in lubricating oils assume [25] a latticeÀlike structure that traps the liquid oil and keep it from pouring or flowing. Low pour point may be achieved by intensively dewaxing the oil during refining.…”

Treating paraffin deposits in producing oil wells

“…This latter is favored by the experience and laboratory tests of Price, using a type of cold finger to test wax deposition and its control. Gavlin et al (1953) studied the pourpoint depression of lubricating oils. Their work supported the theory that pourpoint depressants work via adsorption on a growing wax crystal face.…”