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Direct transesterification of wet microalgae to biodiesel using phosphonium carboxylate ionic liquid catalysts

Malekghasemi, S ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.biombioe.2021.106126
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. In this study, four types of tetrabutylphosphonium carboxylate ionic liquids (ILs) were synthesized and used for a one-pot transesterification of wet Chlorella vulgaris (C. vulgaris) microalgae into fatty acid methyl esters (FAME) in the presence of methanol, as well as refined oils (sunflower, canola, and corn oil). The resulting process removed the need for complete drying and lipid extraction steps typically needed for biodiesel production from microalgae. The leading candidate ionic liquid catalyst, tetrabutylphosphonium formate ([P4444][For]), was further optimized using response surface methodology to minimize material consumption, increase water compatibility, reduce processing time while maximizing yield from wet microalgae biomass. The optimized conditions resulted in a yield of 98.0 ± 2.48% using biomass containing 40 wt% water. Finally, the reusability of the ionic liquid was confirmed and [P4444][For] could be recycled with less than 2% loss between cycles. Due to the simple and low cost of synthesizing this IL, [P4444][For] is a promising catalyst for a one-pot transesterification process for biodiesel production from wet microalgae biomass. © 2021
  6. Keywords:
  7. Biodiesel ; Biomass ; Carboxylation ; Catalysts ; Fatty acids ; Ionic liquids ; Microorganisms ; Reusability ; Sunflower oil ; Transesterification ; Biodiesel production ; Chlorella vulgaris ; Direct transesterification ; Fatty acids methyl esters ; Liquid catalyst ; Micro-algae ; One pot ; Phosphonia carboxylate ; Synthesised ; Transesterifications ; Algae ; Catalyst ; Crop yield ; Fatty acid ; Ionic liquid ; Microalga ; Optimization ; Brassica napus var. napus ; Helianthus
  8. Source: Biomass and Bioenergy ; Volume 150 , 2021 ; 09619534 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S096195342100163X