Raw glycerol re-valuing through etherification with isobutylene: process design and techno-economical assessment

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2021, 94(0), , pp.159-165
• Main Authors: Lopez-Suarez, Franz E., Riveros-Riveros, Daniel M., Cesteros, Yolanda, Salagre, Pilar
• Format: Article
• Language: English
• Subjects: Glycerol; h-GTBE; Isobutylene; Process simulation; Techno-economical assessment; Tert-butyl ethers of glycerol; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2020.10.030

[Display omitted] •Production of tert-butyl ethers of glycerol by etherification with isobutylene.•The production cost is evaluated in Colombian context using different configuration.•Techno-economic assessment to evaluate the most promising configuration.•The production prices varied from 0.8 to 1.38 USD/kg for processes considered.•Refining crude glycerol and a mixture of C4 and isobutylene as raw materials. This study evaluates the techno-economic feasibility to produce tert-butyl ethers of glycerol in Colombia using glycerol obtained from biodiesel production. The major drawback of this process is related to the high costs associated to the isobutylene reagent used for this reaction. Three possible scenarios, using isobutylene: glycerol molar ratios of 2:1 and 4:1, have been evaluated by simulation and techno-economical assessment using pure isobutylene, C4 fraction and a mixture of C4 and isobutylene as well as a refining stage for crude glycerol. The desired product, a mixture of di- and tri- ethers of glycerol (h-GTBE) was obtained in high amounts for the three scenarios (92–99wt.%) and a direct relation between production cost and raw material cost was established. The prices for h-GTBE were higher than the proposed selling prices; however, the formation of byproduct (C4 fraction) can make the process competitive. h-GTBE production did not have a competitive price for any scenario at high isobutylene: glycerol molar ratio. The production price was lowered by around 20% for all scenarios when crude glycerol was considered. Finally, competitive price of h-GTBE (0.96$/kg) and NPV positive was obtained using a mixture of C4 and isobutylene and crude glycerol.