Details

Autor(en) / Beteiligte

• Ramírez, Juliana Cárdenas
• Montañez, Mauro Andrés
• Orjuela, Alvaro
• Narváez, Paulo César
• Katryniok, Benjamin

Titel

Deacidification of used cooking oils by solvent extraction under lab scale and in a falling film contactor

Ist Teil von

• Chemical engineering and processing, 2022-11, Vol.181, p.109089, Article 109089

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• •Deacidification of used cooking oil via batch and continuous solvent extraction.•Ethanol and methanol were assessed in batch liquid-liquid extraction.•Different properties were tracked during the pretreatment process.•A bench scale falling film contactor was used in continuous extraction with ethanol.•Best performance was achieved with ethanol containing 5% wt. water. This work evaluated the pretreatment of used cooking oils (UCOs) via liquid-liquid extraction, both at laboratory and bench scales, under batch and continuous operation. Processed UCOs were collected in Bogotá, Colombia, and physical pretreatment was done by extraction with methanol and ethanol in a batch operation. The selected solvent was further tested in an intensified process using a packed falling film contactor in continuous operation. The effectiveness of the treatment was evaluated with respect to the change in the main targeted properties of UCO, namely acidity index, photometric color index, and content of polar compounds. Additional physicochemical properties of UCO were also tracked during extraction. The most effective pretreatment was achieved by using ethanol as solvent with a water content of 5% wt. This was tested in the continuous contactor using an oil:solvent mass ratio of 1:2, a mass flow of oil of 0.74 kg/h and a packing length of 1.07 m. In a single contact stage, a 51% acidity reduction, a 17% reduction in color index, and a 6.7% reduction in the content of polar compounds were achieved. Preliminary estimations for an industrial process indicate processing costs of 332 US$/t and a carbon footprint of CO2 2.17 kg CO2-eq/kg. [Display omitted]