Influence of polar groups on the depressive effects of polymethacrylate polymers as cold flow improvers for diesel fuel. (15th April 2021)

• Record Type: Journal Article
• Authors: Yang, Taishun; Wu, Junjie; Yuan, Mingxia; Li, Xin; Yin, Suya; Su, Baoting; Yan, Jincan; Lin, Hualin; Xue, Yuan; Han, Sheng
• Is Part Of: Fuel. Volume 290(2021)
• Publication Date: 2021-04-15
• Subjects: Diesel fuel -- Cold flow improvers -- Depressive effects -- Depressive mechanism; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.120035
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: A series of C14 MC-BMI, C14 MC-ACM, and C14 MC-BMI-ACM were synthesized and used as cold flow improvers for diesel fuel. C14 MC-BMI-ACM in diesel exhibited better depressing effects than C14 MC-BMI and C14 MC-ACM. The SP and CFPP of 1000 ppm C14 MC-BMI-ACM (9:0.25:0.75) treated diesel decreased by 22 °C and 12 °C, respectively. The depressive mechanisms of the C14 MC-BMI-ACM in diesel were investigated. Abstract: In this study, a series of polymethacrylate polymers of tetradecyl methacrylate-N-benzylmaleimide copolymers (C14 MC-BMI), tetradecyl methacrylate-4-acryloylmorpholine copolymers (C14 MC-ACM), and tetradecyl methacrylate-N-benzylmaleimide-4-acryloylmorpholine terpolymers (C14 MC-BMI-ACM) were synthesized and characterized by 1 H nuclear magnetic resonance, Fourier transform infrared spectroscopy, and gel permeation chromatography. The influences of benzene rings and morpholine groups on the depressive effects of the polymers as cold flow improvers for diesel fuel were investigated. Results indicated that C14 MC-BMI-ACM with benzene rings and morpholine groups leads to better cold flow properties in diesel in contrast to that of C14 MC-BMI with benzene rings groups and C14 MC-ACM with morpholine groups. Moreover, C14 MC-BMI-ACM (9:0.25:0.75) at 1000 ppm showed the best depressing effect and decreased the solid point and cold filter plugging point of diesel by 22 °C and 12 °C, respectively. In addition, the depressive mechanism was studied using viscosity-temperature curves, differential scanning calorimeter, macrocrystal images, and polarizing optical microscope. The results revealed that compared with copolymers with only benzene rings or morpholine groups, terpolymers with benzene rings and morpholine groups delayed crystal precipitation, changed the number of crystals and liquid state, and modified crystal morphology, thereby significantly reducing the low-temperature viscosity and improving the cold flow properties of diesel fuel.