Abstract
Waste fish oils (FOs) and used cooking vegetable oils (UCOs) are increasingly becoming alterna-tive renewable fuels. However, different physicochemical aspects of these renewable fuels, in-cluding the effect of storage, are not well-known. In this work, the effect of the storage period on physicochemical properties of selected samples of FOs and UCOs was investigated. The bio-oils were stored at 4 °C for up to five years before each experimentation. The chemical properties were characterized using capillary gas chromatography with flame ionization detection (GC-FID) and high-performance size exclusion chromatography including an evaporative light scattering de-tector (HPSEC-ELSD). Water contents and acid numbers of the bio-oils were determined using the Karl Fischer (KF) titration and the ASTM D 664 methods. Furthermore, the average heating values and surface tension of the bio-oils were determined. According to the results obtained, for all bio-oil types, the concentrations of polymerized triglycerides, diglycerides, and fatty acids and monoglycerides had increased during the storage periods. The physical properties of the bio-oils also showed a small variation as a function of the storage period. The overall results observed indicate that the deterioration of the physicochemical properties of bio-oils can be controlled through storage in dark, dry, and cold conditions.
| Original language | English |
|---|---|
| Article number | 101 |
| Pages (from-to) | 1-14 |
| Journal | Energies |
| Volume | 14 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Jan 2021 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- free fatty acid
- bio-oil
- fuel aging
- renewable energy sources