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An experimental study of diesel fuel cloud and pour point reduction using different additives

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Petroleum 2019年第4期5卷 413-416页

作者： Amir Hossein Saeedi Dehaghani Reza Rahimi Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Department of Petroleum Engineering School of Chemical and Petroleum EngineeringShiraz UniversityShirazIran

An experimental study was conducted to investigate the effects of four different additives on pour point and cloud point temperatures of a diesel fuel.Sample mixtures were prepared in different volumetric percentages of four different additives(Ethanol,Toluene,n-Heptane and Xylene)and diesel fuel mixture.Pour point and cloud point temperatures of the blends were measured using standard ASTM D2500 and ASTM D97-96a methods,respectively.Introducing the additives to the diesel fuel did not lead to a significant reduction in cloud point temperature of the fuel.In fact,the greatest obtained reduction in cloud point temperature was achieved using 20 vol%or more of Toluene-diesel fuel mixtures.Although cloud points did not change significantly,even the slightest amounts of additives caused a high reduction in the pour point temperature of the fuel.Ethanol was the most effective additive in lowering the pour point temperature of the fuel.A 20%ethanol-fuel mixture caused nearly a 30reduction in the fuel pour point temperature.Therefore,knowing that none of the additives has a significant effect on cloud point temperature,while the greatest reduction in pour point temperature is achieved using ethanol even in low Vol%s,it can be concluded that the most efficient additive among these four additives to alter cold flow properties of a certain diesel fuel is Ethanol.

关键词： cloud point Pour point Diesel fuel Cold flow properties Wax

Study of linseed oil,its biodiesel and xylene as flow improver for Nigerian waxy crude oils

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Petroleum Research 2022年第1期7卷 138-143页

作者： Ogunkunle Temitope Fred Abraham Victoria Damilola Adebisi Abimbola Ashonibare Rukayat Adenike Tega-oboh Elohor Sylvia Petroleum Engineering Department Covenant UniversityOtaOgun StateNigeria Chemistry Department Covenant UniversityOtaOgun StateNigeria Nigerian Stored Products Research Institute Asa Dam RoadIlorinKwara StateNigeria

In this study,the physicochemical properties of linseed and linseed biofuel were studied and their effect on the flow properties of Nigerian waxy crude oil at different volume fractions was investigated.The Nigerian wax crude oil was characterized for its specific gravity,API gravity,wax content,pour point and cloud point.The properties of the linseed oil and linseed biodiesel investigated include:density,specific gravity,viscosity,pour point,cloud point and flash point.Upon esterification of the free fatty acid(FFA)contained in the linseed oil reduced from 3.5 to 0.75 and the viscosity of the seed oil reduces from 2169 to 362 mm^(2)/s.The linseed oil and its biodiesel exhibited similar trend of reduced viscosity at higher shear rate,however,linseed biodiesel demonstrated the lowest viscosities,cloud points and pour points owing to reduced fatty contents.The effect of the linseed oil and its biodiesel on the pour point and cloud point of the waxy crude oil was determined;and the performance compared to that of xylene.A rapid drop in the pour point and cloud point was observed with the wax crude pre-heated with 0.1 v/v linseed oil,its biodiesel and xylene.

关键词： Seed oils cloud point Rheological properties Pour point Viscosity Waxy crude oil

EFFECT OF HEATING RATE ON THERMO-INDUCED AGGREGATION OF POLY(ETHYLENE OXIDE)-b-POLY(N-ISOPROPYLACRYLAMIDE) IN AQUEOUS SOLUTIONS

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Chinese Journal of Polymer Science 2010年第3期28卷 437-447页

作者：梁德海 Beijing National Laboratory for Molecular Sciences and the Key Laboratory of Polymer Chemistry & Physics of Ministry of Education College of Chemistry & Molecular EngineeringPeking University

The effects of heating rate on the aggregate behavior of poly（ethylene oxide）-b-poly（N-isopropylacrylamide） in aqueous solutions were investigated in detail by laser light scattering and TEM. By employing two separate heating protocols, step-by-step heating at 〈 5 K/step and one-step jump, to heat the sample from 15℃ to the selected temperature, we found that the heating rate only showed significant effect on the aggregates above the cloud point. The aggregate formed by step-by-step heating exhibited a much larger size and a broader size distribution than those formed by one-step jump heating. Moreover, neither of the aggregates were ideal micellar structures as indicated by the size and the Rg/Rh values. On the contrary, at temperatures below the cloud point where the block copolymer formed core-shelled micelles, the heating rate showed negligible effect on the size and size distribution of the micelles. Since the system underwent a phase separation above the cloud point, the heating rate effect could be reasonably explained by the phase separation mechanisms： the nucleation-and-growth mechanism in the metastable region and the spinodal decomposition mechanism in the unstable region.

关键词： Heating rate cloud point Nucleation-and-growth Spinodal decomposition PEO-b-PNIPAm.

Research and Application of Anti-Collapse Lubricant Compound Polyalcohol for Water-Based Drilling Fluid

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Open Journal of Yangtze Oil and Gas 2022年第1期7卷 1-12页

作者： Chujun Zhang Chunzhi Luo Liyuan Ye Huan Zhang Huan Xiang College of Chemistry and Environmental Engineering Yangtze University Jingzhou China

Polyalcohol is an environmentally friendly anti-collapse lubricant commonly used in water-based drilling fluids. It is generally composed of the single polyether or polyol, but its lubricity and anti-collapse inhibition can’t satisfy the application of current water-based drilling fluid systems well. Consequently, the laboratory has carried out research on the anti-collapse lubricant compound polyalcohol. The anti-collapse lubricant samples are mixed with lauryl polyether, nonylphenol polyether and Tween 80 according to different proportions. The cloud point, the reduction rate of lubrication coefficient and linear expansion are measured, and the change they caused should be observed. Then, the optimal ratio is optimized through orthogonal experiments. The results show that the increase in the content of the three kinds of polyethers respectively enhances the inhibition. When the content of lauryl polyether increases, the cloud point of the anti-collapse lubricant declines and the reduction rate of lubrication coefficient rises;when the content of nonylphenol polyether increases, the cloud point declines, but it has little effect on the reduction rate of the lubrication coefficient;when the content of Tween 80 increases, the cloud point rises, and the reduction rate of the lubrication coefficient first augments and then basically remains unchanged. The best mass ratio of lauryl polyether:TW-80:nonylphenol polyether is 6:3:4.

关键词： Polyalcohol Lubricity Inhibition Lauryl Polyether Nonylphenol Polyether Tween 80 cloud point

Studies on the cloud points of Nonionic Surfactants with QSPR

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Chemical Research in Chinese Universities 2007年第6期23卷 715-719页

作者： CHEN Mei-ling WANG Zheng-wu ZHANG Ge-xin GU Jin CUN Zhe TAO Fu-ming School of Chemistry and Materials Engineering Southern Yangtze University Wuxi 214122 P. R. China Department of Food Science ＆ Technology School of Agriculture and Biology Shanghai Jiaotong University Shanghai 201101 P. R. China Department of Chemistry and Biochemistry California State University Fullerton CA 92834 USA

With quantum chemical parameters, topological indexes, and physical chemistry parameters as descriptors, a quantitative structure-property relationship（QSPR） has been found for the cloud points of four series of nonionic surfactants（ a total of 65 surfactants）. The best-regressed model includes six descriptors, and the correlation coefficient of multiple determination is as high as 0. 962.

关键词： Nonionic surfactants cloud point Quantitative structure-property relationship

The effects of storage time on fuel properties of Jatropha biodiesel blends

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Journal of Bioresources and Bioproducts 2018年第3期3卷 101-106页

作者： Ajimotokan H.Adewale Rabiu A.Baba Lawal A.Rilwan Department of Mechanical Engineering Faculty of Engineering and TechnologyUniversity of IlorinIlorinNigeria LPG Plant PPMC/NNPC DepotTunfure GombeGombe StateNigeria

This study investigates the effects of storage time on fuel properties of biodiesel made from Jatropha oil and its blends with mineral diesel at different percentage compositions.The influence of storage stability on selected fuel properties such as kinematic viscosity,density,pour,cloud and flash points for Jatropha biodiesel and its blends at varying storage times were investigated using standard test methods.The biodiesel obtained through trans-esterification of Jatropha oil was blended with mineral diesel to obtain fractional samples of B20(20%biodiesel blend),B40(40%biodiesel blend),B60(60%biodiesel blend)and B100(100%neat biodiesel).Results show that kinematic viscosity and density increase for each blend over the 12 weeks of storage period.Flash,cloud and pour points decrease for each blend over the period of study.B20 was observed to be the optimum blend mix as its fuel properties were relatively unchanged over the storage period when compared to that of mineral diesel.It can be implied from the research that while properties like kinematic viscosity and density deteriorate with time;flash,cloud and pour points are observed to have improved with storage time.

关键词： Biodiesel storage stability kinematic viscosity density flash point pour point cloud point

Improving Cold Flow Property of Biodiesel from White Sesame Seed Oil

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Improving Cold Flow Property of Biodiesel from White Sesame ...