Experimental study of pour point and improving the rheological properties of Crude Oil using imidazolium-based ionic liquids

Subject Areas :

ali asghar paseban ¹ , ali akbar miran beigi ² , majid abdous ³

1 - Instructor of Chemical Engineering, Petroleum Refining and Processing Technology Development Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran.
2 - Associate Prof. of Analytical Chemistry, Petroleum Refining and Processing Technology Development Division, Research Institute of Petroleum Industry (RIPI), Tehran, Iran
3 - Prof. of Organic Chemistry, Amirkabir University of Technology, Tehran, Iran.

Received: 2019-11-22 Accepted : 2020-03-21 Published : 2020-08-22

Keywords: Crude oil, Ionic liquids, Pour point depressant, Wax appearance temperature,

Abstract :

In this research, fluidity of crude oil at low temperatures was investigated on several Iranian oil samples by using two imidazolium-based ionic liquids (ILs). Both ILs have high solubility in crude oil. A 2000 ppm solution of [C14 mim][NTf2] exhibited more ability in decreasing pour point down to 12 °C. Wax crystals nucleation and growth were studied before and after of the addition of ILs. The results revealed that both the studied ILs could significantly decrease pour point of samples via delay in nucleation mechanism of wax crystals. Furthermore, in the presence of ILs rheological behavior of tested crude oils was improved. Besides, the viscosity at 23.5 °C and 15 °C was decreased 73% and 87%, respectively. 

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