Sustainable Biocatalytic Procedure for Obtaining New Branched Acid Esters

Materials

Miguel Asensi¹  Josefa Bastida¹  Silvia Gimeno-Martos¹  Fuensanta Máximo¹  María Claudia Montiel¹ 

[1] Chemical Engineering Department, Faculty of Chemistry, Campus Mare Nostrum, University of Murcia, 30100 Murcia, Spain;

关键词: biocatalysis;    branched-chain acid ester;    solvent-free;    process productivity;    green metrics;    economic assessment;   

DOI  :  10.3390/ma14226847

来源: DOAJ

【 摘 要 】

Biocatalytic synthesis of 2-ethylhexyl 2-methylhexanoate is described in this work for the first time. This branched-chain ester is suitable for use at low temperatures in numerous applications. The immobilized lipase Novozym^® 435 has demonstrated its ability to catalyze the ester synthesis from 2-ethylhexanol and 2-methylhexanoic acid in a solvent-free medium. The high reaction times that are required result in a loss of alcohol by evaporation, which must be compensated for with an excess of this substrate if high conversions are to be achieved. Therefore, two strategies are established: 70 °C with a 10% excess of alcohol, which requires a longer operating time and provides conversions of 97%, and 80 °C with a 20% excess of alcohol, which allows for the achievement of a 99% conversion in a shorter time. The optimal reaction conditions have been chosen based on reusability of the enzyme, process productivity, green metrics and preliminary economic study. When the synthesis is carried out under the best conditions (70 °C, 10% molar excess of alcohol and six uses of the immobilized enzyme) a productivity of 203.84 kg product × kg biocatalyst⁻¹ is attained. The biocatalytic procedure matches many of the objectives of “green chemistry” and is suitable to be scaled up and used in industrial manufacturing.

【 授权许可】

Unknown