Production and characterization of bio-oil from the pyrolysis of waste frying oil

Abstract

In this present work, the disposal of waste frying oil was explored. The experiment tests were performed under nitrogen (N) atmosphere at 5 °C/min heating rate from the ambient temperature to 500 °C. In these operating conditions, the obtained pyrolitic liquid fraction was 76 wt% formed by 63.87 wt% of crude bio-oil and 12.13 wt% of aqueous fraction. The chemical characterization using FTIR, GC, and GC/MS has revealed that the bio-oil is a complex chemical mixture of linear saturated, unsaturated, and cyclic hydrocarbons and oxygenated compounds such as carboxylic acids, ketones, aldehydes, and alcohols. Moreover, the produced bio-oil can be considered as promising fuel with high calorific value (∼39 MJ/kg). However, the higher acidity (∼125 mg KOH/g sample) and viscosity (9.53 cSt at 40 °C) limit currently its direct use in engines. Therefore, although several promising results, further investigations are requested to improve the bio-oil quality in order to find an environmentally friendly issue to waste frying oil.

Fast Pyrolysis of Sunflower Oil in the Presence of Microporous and Mesoporous Materials for Production of Bio-Oil

“…Generally, triglyceride pyrolysis mechanisms are difficult due to their complex chemical structures [42]. Figure 8 [42] shows the decomposition of a triglyceride reaction. Bio-oil obtained from the thermal pyrolysis of sunflower oil is a complex mixture of organic compounds with carbon atom number from C15 to C37 (n-alkanes e branched alkenes) and oxygenated products such as aldehydes, ketones, carboxylic acids, alcohols and esters.…”

“…As the pyrolysis temperature used in this study is low (500 • C), the formation of carbon dioxide, carbon monoxide and aromatic, aliphatic and cyclic hydrocarbons was not observed. Generally, triglyceride pyrolysis mechanisms are difficult due to their complex chemical structures [42]. Figure 8 [42] shows the decomposition of a triglyceride reaction.…”

“…Generally, triglyceride pyrolysis mechanisms are difficult due to their complex chemical structures [42]. Figure 8 [42] shows the decomposition of a triglyceride reaction. The data indicate a difference in the composition of the products obtained in the thermal cracking and in the thermo-catalysts.…”

“…The decarboxylation and decarbonylation reaction is important for the reduction of the oxygenates product. Equations (1) and (2) show decarboxylation and decarbonylation reaction [42]:…”

Process engineering for pollution control and waste minimization

“…Results showed that the adsorption kinetics was strongly improved in the presence of AC. Kraiem et al (2017) have explored the disposal of waste frying oil. Pyrolysis was used to treat the liquid waste in order to improve the quality of the produced bio-oil.…”