Comparison of the Turbulent Drag Reduction Effectiveness of Polymers from Higher Olefin Monomers (Hexene, Octene, Decene, Dodecene) in the Production of Hydrodynamic Drag Reducing Agents for Transportation of Hydrocarbon Liquids

Tavtorkin, Alexander N.; Гавриленко, И. Ф.; Kostitsyna, N. N.; Корчагина, С. А.; Chinova, M. S.

doi:10.1134/s1070427220060026

Cited by 3 publications

(6 citation statements)

References 6 publications

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“…8-10 show 13 C NMR specters of the present polymers. In 13 C NMR of A1 polymer, the signal at 15 ppm is corresponding to methyl carbon (C1). While, signals at 22 ppm and 32 ppm were assigned to adjacent methylene carbon (C2) and (C3), respectively.…”

Section: C Nmr Analysismentioning

confidence: 84%

“…Bruker Avance 400 spectrometer at frequency 100 MHz was also utilized to recorded 13 C NMR spectra. The solvent was CDCl3 and Fig.…”

Section: C Nmr Analysismentioning

confidence: 99%

“…The solvent was CDCl3 and Fig. 8-10 show 13 C NMR specters of the present polymers. In 13 C NMR of A1 polymer, the signal at 15 ppm is corresponding to methyl carbon (C1).…”

Section: C Nmr Analysismentioning

confidence: 99%

“…The signal at 62 ppm may attributed to the formation of polyester, which assigned to carbon (C8) of methylene group, nearby oxygen of ester group. The electron withdrawing of oxygen of ester groups is shifted the adjacent carbon atom through reducing amount of electron density around it leads to emergence 13 C NMR signal at higher ppm [20]. This outline is basically the same as that in other polymers, A2-A9, with one remarkable difference was found in signal intensity of methylene carbon (C4), 29 ppm, which appeared considerable as the longer alkyl branches or longer distances between branch points exist in polymer structure.…”

Section: C Nmr Analysismentioning

confidence: 99%

“…Several types of research have been conducted to explain the effect of branch length on DRA performance and stability [12][13][14]. However, it is important to highlight that there are no adequate experimental studies concerned with the effect of distance between two emitted branches on polymeric DRA performance and mechanical stability.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Polymer Structure Diversity on the Eddies Suppression of Basrah Light Crude Oil Turbulent Flow

2021

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Poly(pentaerythritol adipate), poly(pentaerythritol sebacate), and poly(pentaerythritol hexadecandioate) derivatives containing different length alkyl branches were synthesized by two subsequent steps; the reaction of pentaerythritol with (C8-C16) linear aliphatic monocarboxylic acids and then, polymerization of products with (C6-C16) linear aliphatic dicarboxylic acids, using 1% para toluene sulfonic acid as a catalyst. The products were purified and characterized by FTIR, 1 H NMR, and 13 C NMR spectroscopy. End group analysis was also used as a molecular weight determination technique. The drag-reducing properties of those polymers were investigated in the turbulent flow of Basrah light crude oil using a closed-loop circulation system. Some were found to perform very well DRA and drag reduction efficacy of polymer was further found to be dependent on flowrate, polymer concentration, medium-temperature, and its chemical structure. Also, the effect of the imposed mechanical shear on the polymer stability as a function of time has been investigated using a cylindrical rotator device. It was observed that distance between branch points plays a direct role in contributing to the polymer performance and its mechanical stability.

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Section: C Nmr Analysismentioning

confidence: 84%

“…Bruker Avance 400 spectrometer at frequency 100 MHz was also utilized to recorded 13 C NMR spectra. The solvent was CDCl3 and Fig.…”

Section: C Nmr Analysismentioning

confidence: 99%

“…The solvent was CDCl3 and Fig. 8-10 show 13 C NMR specters of the present polymers. In 13 C NMR of A1 polymer, the signal at 15 ppm is corresponding to methyl carbon (C1).…”

Section: C Nmr Analysismentioning

confidence: 99%

Section: C Nmr Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Polymer Structure Diversity on the Eddies Suppression of Basrah Light Crude Oil Turbulent Flow

2021

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Drag reduction assessment of some new copolymers of 1-hexene and maleic anhydride in light crude oil

Jalal

Khalaf

Hussein

2021

Petroleum Science and Technology

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Tandem Synthesis of Ultra-High Molecular Weight Drag Reducing Poly-α-Olefins for Low-Temperature Pipeline Transportation

et al. 2021

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Ultra-high molecular weight poly-α-olefins are widely used as drag reducing agents (DRAs) for pipeline transportation of oil and refined petroleum products. The synthesis of polyolefin DRAs is based on low-temperature Ziegler–Natta (ZN) polymerization of higher α-olefins. 1-Hexene based DRAs, the most effective at room temperature, typically lose DR activity at low temperatures. The use of 1-hexene copolymers with C8–C12 linear α-olefins appears to offer a solution to the problem of low-temperature drag reducing. The present work aims to develop two-stage synthesis of polyolefin DRAs that is based on selective oligomerization of ethylene in the presence of efficient chromium/aminodiphosphine catalysts (Cr-PNP), followed by polymerization of the olefin mixtures, formed at oligomerization stage, using efficient titanium–magnesium ZN catalyst. We have shown that oligomerization of ethylene in α-olefin reaction media proceeds faster than in saturated hydrocarbons, providing the formation of 1-hexene, 1-octene, and branched C10 and C12 olefins; the composition and the ratio of the reaction products depended on the nature of PNP ligand. Oligomerizates were used in ZN polymerization ‘as is’, without additional treatment. Due to branched character of C10+ hydrocarbons, formed during oligomerization of ethylene, resulting polyolefins demonstrate higher low-temperature DR efficiency at low polymer concentrations (~1 ppm) in comparison with benchmark polymers prepared from the mixtures of linear α-olefins and from pure 1-hexene. We assume that faster solubility and more efficient solvation of the polyolefins, prepared using ‘tandem’ ethylene-based process, represent an advantage of these type polymers over conventional poly(1-hexene) and linear α-olefin-based polymers when used as ‘winter’ DRAs.

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Comparison of the Turbulent Drag Reduction Effectiveness of Polymers from Higher Olefin Monomers (Hexene, Octene, Decene, Dodecene) in the Production of Hydrodynamic Drag Reducing Agents for Transportation of Hydrocarbon Liquids

Cited by 3 publications

References 6 publications

Effect of the Polymer Structure Diversity on the Eddies Suppression of Basrah Light Crude Oil Turbulent Flow

Effect of the Polymer Structure Diversity on the Eddies Suppression of Basrah Light Crude Oil Turbulent Flow

Drag reduction assessment of some new copolymers of 1-hexene and maleic anhydride in light crude oil

Tandem Synthesis of Ultra-High Molecular Weight Drag Reducing Poly-α-Olefins for Low-Temperature Pipeline Transportation

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