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Effect of nanocomposite as pour point depressant on the cold flow properties and crystallization behavior of diesel fuel

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Chinese Chemical Letters 2022年第5期33卷 2677-2680页

作者： Yuan Xue Fengfei Chen Bin Sun Hualin Lin Bin Dai Sheng Han School of Chemical and Environmental Engineering Shanghai Institute of TechnologyShanghai 201418China School of Chemistry and Chemical Engineering Shihezi UniversityShihezi 832003China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

The high effective nano-hybrid pour point depressant(PPD)has attracted extensive attention for its po-tential application in improving the cold flow properties of diesel fuel.In this paper,the nano-hybrid PPD was prepared by melt-blending method using three different alkyl chain lengths(i.e.,tetradecyl,hexade-cyl,and octodecyl)of n-alkyl methacrylate-maleic anhydride copolymers(R 1 MC-MA,R 1=C_(14),C_(16),C_(18))and SiO_(2)nanoparticles.The effect of those nano-hybrid PPDs on the cold filter plugging point(CFPP)and solidifying point(SP)depressing of diesel fuel were studied.Results indicated that nano-hybrid PPD showed much better performance on diesel fuel.The diesel fuel treated with 0.2 wt%C_(14)MC-MA/SiO_(2)nano-hybrid PPD exhibited the best depression in CFPP and SP by 6℃ and 18℃,respectively,which higher than that of single C 14 MC-MA.Viscosity-temperature curves and polarized optical microscopy were conducted to explore the performance mechanism;and results presented that nano-hybrid PPD of C_(14)MC-MA/SiO_(2)could effectively lower the low-temperature viscosity,and modify the crystallization behavior and crystal morphology of diesel.Therefore,the cold flow properties of diesel were significantly improved.

关键词： Diesel fuel pour point depressant Nano-hybrid Cold flow properties Crystallization behavior

Synthesis of comb bipolymers and their pour point depressing properties

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Petroleum Science 2014年第1期11卷 155-160页

作者： Zhang Changqiao Gao Congcong Gao Fengfeng Wang Jian Zhang Dawei Wang Yan Xu Dawei School of Chemistry and Chemical Engineering Shandong University Shandong Quality Certification Centre Shandong Product Quality Supervision & Inspection Research Institute

A bipolymer maleic anhydride-methyl acrylate （MAMA） was synthesized from maleic anhydride and methyl acrylate based on molecular design.MAMA further reacted with oleylamine or octadecyl alcohol to generate two comb polymers called Oleamide-MAMA （NMAMA） and OctadecanolMAMA （OMAMA）,respectively.The structure of both the polymers was confirmed by their infrared spectral analysis （IR）,gel permeation chromatography analysis （GPC） and differential scanning calorimeter （DSC）.Moreover,the pour point depressing （PPD） properties of these comb polymers were examined experimentally.Experimental results showed that besides the molecular weight and concentration of the polymers,the length of side chains and the number of functional groups also had great influence on the pour point depressing performance.The π bonds and hydrogen bonds between depressants were the key factors for improving the pour point depressing properties.These results suggest that both OMAMA and NMAMA are potential pour point depressants for industry.

关键词： Maleic anhydride comb polymers pour point depressant hydrogen bonds molecular simulation

Rheological Properties of Waxy Crude at a Low Temperature in the Presence of pour point depressants

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Petroleum Science 2005年第4期2卷 62-65页

作者： Jiang Qingzhe Zhao Mifu Song Zhaozheng Ke Ming State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China Dongxin Oil Production Plant Shengli Petroleum Administrative Bureau Dongying Shandong 257001 China

pour point depressants （PPD） are used to improve the theology of waxy crude. The affect of various factors on the theological properties, and the thermal characteristics of waxy crude treated by PPD have been investigated. The conclusions are as follows： PPD can reduce the pour point and abnormal point of waxy crude, broaden the temperature range of Newtonian fluid of waxy crude, and lower greatly the viscosity of non-Newtonian fluid of waxy crude. The influence of reheating and high-rate shear on the effect of PPD mainly depends on their temperature. When the reheating temperature is more than the abnormal point of crude by 10℃, the reheating process has little effect on the modification effect of PPD. However, when the reheating temperature is below the abnormal point of crude, the reheating process will reduce the modification effect of PPD. When temperature is above the abnormal point of crude, the high-rate shear has little effect on the modification effect of PPD. At a temperature range where a lot of wax is precipitating, high-rate shear will greatly reduce the modification effect of PPD.

关键词： pour point depressant temperature-viscosity curve reheat high-rate shear

New PAMA Technology Helps Tackle the New Challenges of China Automotive Sector

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润滑油 2010年第1期25卷 31-38页

作者： Alex Tsay Evonik RohMax Asia Pacific Pte.Ltd

Polyalkylmethacrylate (PAMA) based viscosity index improver (VII) and pour point depressant (PPD), with the versatile chemistry and unique performance characteristics, are widely used in advanced formulations, enabling fluids to meet rheological requirement of modern specifications. This paper will be dedicated to the application of PAMA in helping China automotive lubricant formulators tackle the challenges of improving fuel economics from using lower viscosity fluids, of better protection strengthten in transmission performance and meeting new global specifications for low temperature performance.

关键词： polyalkylmethacrylate viscosity index improver pour point depressant automatic transmission fluid gear oil ROBO test

苯乙烯-马来酸酐共聚物改性在模拟原油降凝减粘中的应用

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苯乙烯-马来酸酐共聚物改性在模拟原油降凝减粘中的应用