eprintid: 10150864 rev_number: 10 eprint_status: archive userid: 699 dir: disk0/10/15/08/64 datestamp: 2023-08-29 12:08:08 lastmod: 2023-08-30 08:33:21 status_changed: 2023-08-29 12:08:08 type: proceedings_section metadata_visibility: show sword_depositor: 699 creators_name: Umar, Yusuf creators_name: Aboelazayem, Omar creators_name: Echresh, Zahra creators_name: Gadalla, Mamdouh creators_name: Saha, Basudeb title: Waste cooking oil valorisation into biodiesel using supercritical methanolysis: Critical assessment on the effect of water content ispublished: pub divisions: C05 divisions: F43 divisions: B04 divisions: UCL keywords: Biodiesel, Organic waste, Modelling, Transesterification, Esterification note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: In this work, valorisation of high acid value waste cooking oil (WCO) into biodiesel has been assessed using supercritical methanolysis. The effect of the water content in the feedstock has been critically investigated. Using supercritical methanolysis, the higher water content in the feedstock enhanced the hydrolysis of triglycerides to free fatty acids (FFAs) and the esterification of FFAs into fatty acid methyl esters (FAMEs) has been reported. The effect of water content has been investigated by adding different volumes of water to the feedstock prior to the reaction. Response Surface Methodology (RSM) using Central Composite Design (CCD) has been used to design the experiments and to optimise the experimental variables. Five controllable reaction parameters have been studied including methanol to oil (M:O) molar ratio, reaction temperature, reaction pressure, reaction time and water content. Biodiesel yield has been chosen as reaction response for the experimental runs. The linear effect of reaction parameters and their interactions on biodiesel yield has been analysed. It has been observed that increasing the water content of the feedstock decreases the yield of biodiesel at specific conditions. However, due to the high interactive effect between water content and reaction time, it has been observed increasing effect at longer reaction time. A quadratic model has been developed using the reported experimental results representing biodiesel yield function in all of the experimental parameters. The adequacy of the predicted model has been checked statistically using analysis of variance (ANOVA). Numerical optimisation has been applied to identify the optimal reaction conditions for maximum production of biodiesel. The developed optimal condition has reported 99.8% biodiesel yield at 10:1 M:O molar ratio, 245 oC, 125 bar, 6 vol% of water content within 19 min. date: 2019-05-30 date_type: published publisher: EUBCE (European Biomass Conference and Exhibition) official_url: http://www.etaflorence.it/proceedings/ oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1963389 lyricists_name: Echresh Zadeh, Zahra lyricists_id: ZECHR12 actors_name: Echresh Zadeh, Zahra actors_id: ZECHR12 actors_role: owner full_text_status: public pres_type: paper series: European Biomass Conference and Exhibition volume: 27 place_of_pub: Lisbon, Portugal event_title: EUBCE 2019 –27th European Biomass Conference and Exhibition event_location: Lisbon, Portugal event_dates: 26 May 2019 - 31 May 2019 book_title: Proceedings of the 27th European Biomass Conference and Exhibition citation: Umar, Yusuf; Aboelazayem, Omar; Echresh, Zahra; Gadalla, Mamdouh; Saha, Basudeb; (2019) Waste cooking oil valorisation into biodiesel using supercritical methanolysis: Critical assessment on the effect of water content. In: Proceedings of the 27th European Biomass Conference and Exhibition. EUBCE (European Biomass Conference and Exhibition): Lisbon, Portugal. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10150864/1/3DV.6.3_Paper_Zahra.pdf