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Study of the mechanical degradation mechanism of guar gum in turbulent flow by FTIR.
Motta, Marcus Vinícius Lisboa; de Castro, Eustáquio Vinícius Ribeiro; Muri, Emanuel José Bassani; Costalonga, Michell Luiz; Loureiro, Bruno Venturini; Filgueiras, Paulo Roberto.
Affiliation
  • Motta MVL; Federal University of Espírito Santo - Chemistry Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil; Faculdade do Centro Leste, Rodovia E.S. 010, Km 6.5, P. O. Box: 29173-087, Manguinhos, Serra, E.S., Brazil.
  • de Castro EVR; Federal University of Espírito Santo - Chemistry Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil.
  • Muri EJB; Federal University of Espírito Santo - Chemistry Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil.
  • Costalonga ML; Faculdade do Centro Leste, Rodovia E.S. 010, Km 6.5, P. O. Box: 29173-087, Manguinhos, Serra, E.S., Brazil; Federal University of Espírito Santo - Mechanical Engineering Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil.
  • Loureiro BV; Federal University of Espírito Santo - Mechanical Engineering Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil.
  • Filgueiras PR; Federal University of Espírito Santo - Chemistry Department, Vitória, Av. Fernando Ferrari, 514, P. O. Box: 29075-910, Goiabeiras, Vitória, E.S., Brazil. Electronic address: filgueiras.pr@gmail.com.
Int J Biol Macromol ; 121: 23-28, 2019 Jan.
Article in En | MEDLINE | ID: mdl-30291930
Guar gum is used in low concentrations as a drag reducing agent in turbulent flows to significantly accelerate flow in oil pipelines, oil well operations and aqueous systems. Drag reduction also promotes a decrease in energy demand in pumping systems. However, the polymers undergo mechanical degradation and lose the ability to promote drag reduction over time. In this paper, the drag reduction, the power required by the pumps and the degradation of the guar gum were evaluated during a turbulent flow of an aqueous solution containing the biopolymer. The results indicate the mechanism of degradation of guar gum by the hydrolysis of the bond α (1 → 6), liberating the galactose, which justice to the loss of efficiency throughout the process. An understanding of this mechanism should allow for the development of more mechanically resistant polymers and the increase of drag reduction capacity over time.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Spectroscopy, Fourier Transform Infrared / Plant Gums / Mechanical Phenomena / Galactans / Mannans Language: En Journal: Int J Biol Macromol Year: 2019 Document type: Article Affiliation country: Brazil Country of publication: Netherlands

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Spectroscopy, Fourier Transform Infrared / Plant Gums / Mechanical Phenomena / Galactans / Mannans Language: En Journal: Int J Biol Macromol Year: 2019 Document type: Article Affiliation country: Brazil Country of publication: Netherlands