Extraction of spent bleaching earth in the production of renewable diesel

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Vilppu Kuuluvainen, Päivi Mäki-Arvela, Kari Eränen, Anton Holappa, Jarl Hemming, Heidi Österholm, Blanka Toukoniitty, Dmitry Y. Murzin
Publication year: 2015
Journal: Chemical Engineering and Technology
Volume number: 38
Issue number: 5
Start page: 769
End page: 776
eISSN: 1521-4125


The extraction of oils based on animal fat and vegetable oil from two types of spent bleaching earths, namely from the acidic sepiolite and the nonacidic palygorskite, was investigated by the Soxhlet method with hexane as a solvent. The yields of oil were independent of the feedstock, whereas a much lower oil yield was obtained with palygorskite exhibiting also a smaller surface area as compared to sepiolite which provided a higher yield. The glyceride compositions were very similar in bleached and extracted oils, while slightly lower melting and crystallization energies were determined by differential scanning calorimetry for the extracted oils bleached with acidic clay indicating minor hydrolysis of triglycerides.

Last updated on 2020-20-01 at 04:33