• Wacharakron Jaitong Faculty of Industrial Technology, Pibulsongkram Rajabhat University
  • Montree Wongsiriwittaya Faculty of Industrial Technology, Pibulsongkram Rajabhat University



Fast pyrolysis, Free fall reactor, Used engine oil, Heavy oil


This experiment aims to improve the properties of used engine oil that has been in operation for 12,000 kilometers. The oil is subjected to a fast pyrolysis process in a drop tube furnace at temperatures of 400, 450, 500, 550, and 600 degrees Celsius, with oil feed rates of 50 and 100 milliliters per hour. The objective is to investigate the properties of the oil after undergoing rapid pyrolysis treatment, including heat value, density, viscosity, acidity, flash point, and ignition point, according to ASTM standards. The experimental results are compared with diesel and biodiesel fuels to provide guidance for decision-making in the production of biofuels for single-cylinder small engines used by farmers.


Auti SM, Rathod WS. Effect of hybrid blends of raw tyre pyrolysis oil, karanja biodiesel and diesel fuel on single cylinder four stokes diesel engine. Energy Reports 2021;7:2214-2220.

Balat M, Demirbas MF, Balat M. Pyrolysis of waste engine oil in the presence of wood ash. energy sources, part A: Recovery, Utilization, and Environmental Effects 2009;31(16):1494-1499.

Budianto MA, Anis S, Sumbodo,W. Study of thermal heating of waste engine oil in a microwave pyrolysis reactor. Journal of Physical Science 2018;29(2):39-52.

Ellens CJ, Brown RC. Optimization of a free-fall reactor for the production of fast pyrolysis bio-oil. Bioresour Technol 2012;103(1):374-380.

Kumar S, Singhal MK, Sharma MP. Analysis of oil mixing for improvement of biodiesel quality with the application of mixture design method. Renewable Energy 2023;202:809-821.

Wongsiriwittaya M, Pattiya A. Bio-oil from catalytic fast pyrolysis of sugarcane leaves and topsin a bubbling fluidised bed reactor. SWU Engineering Journal 2017;12(1):114-126.

Ninpanit P, Malik A, Wakiyama T, Geschke A, Lenzen M. Thailand’s energy-related carbon dioxide emissions from production-based and consumption-based perspectives. Energy Policy 2019;133:110877.

Onwudili JA, Sharma V, Scaldaferri CA, Hossain AK. Production of upgraded fuel blend from fast pyrolysis bio-oil and organic solvent using a novel three-stage catalytic process and its combustion characteristics in a diesel engine Fuel 2023;15(4):335-346.

Santhoshkumar A, Ramanathan A. Recycling of waste engine oil through pyrolysis process for the production of diesel like fuel and its uses in diesel engine Energy; 2020.

Shoaib AM, El-Adly RA, Hassanean MHM, Youssry A, Bhran AA. Developing a free-fall reactor for rice straw fast pyrolysis to produce bio-products. Egyptian Journal of Petroleum 2018;27(4):1305-1311.

Suiuay C, Laloon K, Katekaew S, Senawong K, Noisuwan P, Sudajan S. Effect of gasoline-like fuel obtained from hard-resin of Yang (Dipterocarpus alatus) on single cylinder gasoline engine performance and exhaust emissions. Renewable Energy 2020;153: 634-645.

Sunarno Zahrina I, Reni Yenti S, Sri Irianty R, Setia Utama P. Catalytic co-pyrolysis of palm oil empty fruit bunch and waste tire using calcium oxide catalysts for upgrading bio-oil. Materials Today: Proceedings; 2023.

Zahir Hussain A, Santhoshkumar A, Ramanathan A. Assessment of pyrolysis waste engine oil as an alternative fuel source for diesel engine. Journal of Thermal Analysis and Calorimetry 2020;141(6): 2277-2293.

Zandie M, Ng HK, Gan S, Muhamad Said MF, Cheng X. Development of a reduced multi-component chemical kinetic mechanism for the combustion modelling of diesel-biodiesel-gasoline mixtures. Transportation Engineering 2022;13(2):256-269.




How to Cite

Jaitong, W. ., & Wongsiriwittaya, M. (2023). IMPROVEMENT OF USED ENGINE OIL PROPERTIES BY FAST PYROLYSIS IN FREE-FALL REACTOR. Life Sciences and Environment Journal, 24(2), 482–493.



Research Articles