Enhancing the biodiesel manufacturing process by use of glycerin to produce hyacinth fragrance

Cauê A C Silva, Flávia C A Figueiredo, Raphael Rodrigues, Mirela I. Sairre, Maraisa Gonçalves, Isabel M. Fonseca, Dalmo Mandelli, Wagner A. Carvalho, Inês Matos

Research output: Contribution to journalArticlepeer-review


Oxidized and sulfonated-activated carbons (AC) were tested in the catalytic conversion of glycerol by acetalization reactions. The solids were treated with concentrated nitric acid and/or fuming sulfuric acid (AC, AC-N, AC-S, and AC-NS). The presence of sulfur and an increase in the acidity of the solids demonstrate the suitability of the oxidation as well as the sulfonation process, especially in the sample treated with concentrated nitric acid and fuming sulfuric acid (AC-NS). The best catalyst for the reaction of glycerol acetalization with phenylacetaldehyde was AC-NS, with a phenylacetaldehyde conversion of 95 % after 90 min at 383 K and selectivity of 88 and 12 %, respectively, to dioxolane and dioxane. These products can be used as hyacinth fragrance flavoring compounds. Furthermore, a contribution of homogeneous catalysis in these systems was not identified. Thus, we identified a possibility of glycerol conversion, a biodiesel by-product, into value-added products by suitable catalysts produced from activated carbons.

Original languageEnglish
Pages (from-to)1551-1563
Number of pages13
JournalClean Technologies And Environmental Policy
Issue number5
Publication statusPublished - 1 Jun 2016


  • Acetalization
  • Activated carbon
  • Glycerol
  • Hyacinth fragrance
  • Sulfonation


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