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RevistaRenewable energy
Año2020
Volumen148
Páginas689-696
Internacional

Enzymatic synthesis of neopentyl glycol-bases biolubricants using biodiesel from soybean and castor bean as raw materials

Autores:Roberto Fernandez-Lafuente
Grupos de investigación:Optimización de biocatalizadores y bioprocesos enzimáticos
 
Érika C.G. Aguieiras1*†, Elisa D.C. Cavalcanti1*†, Priscila R. da Silva1, Valéria F. 
Soares1, Roberto Fernandez-Lafuente2, Charles Lima Bessa Assunção3, José André C. 
da Silva3, Denise M.G. Freire1* 
 
1Universidade Federal do Rio de Janeiro, Instituto de Química, Laboratório de 
Biotecnologia Microbiana, Rio de Janeiro, RJ, Brazil 
2Departamento de Biocatálisis. ICP-CSIC. C/ Marie Curie 2. Campus UAM-CSIC. 
Cantoblanco. 28049 Madrid (Spain). 
3Petrobras SA. Research Center, Lubricants and Special Products, Rio de Janeiro, RJ, 
Brazil 
 
The aim of this work was to produce neopentyl glycol esters with fatty acids (NPG esters) having a potential application as biolubricant via enzymatic transesterification of neopentyl glycol (NPG) with biodiesel produced from soybean and castor oil. The potential of two commercial immobilized lipases, lipase B from Candida antarctica and lipase from Rhizomucor miehei (Novozyme 435 and Lipozyme RM IM, respectively) to produce NPG esters in a solvent-free medium was evaluated. The highest conversions (>95%) were attained using soybean biodiesel as substrate for both enzymes, at reaction with 3.75:1 biodiesel/NPG molar ratio, 4 wt.% immobilized enzyme and 1 wt.% water addition, at 40 ºC, in 24 h. Both enzymes could be successfully reused for six reactions, Novozyme 435 maintained ≥ 70% of the initial conversion (initial conversions were 100 and 90% for soybean and castor biodiesel, respectively) using the two starting raw materials and Lipozyme RM IM maintained ≥ 90% of the first reaction conversion (77%) using castor biodiesel. The NPG esters obtained showed good properties. The products using soybean biodiesel presented a viscosity index higher than 180 and the products using castor biodiesel have a pour point lower than -20 °C and oxidative stability higher than 30 min. 
Palabras clave:Biolubricant; polyol ester; neopentyl glycol; biodiesel; lipase.
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