Journal
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
Volume 39, Issue 11, Pages 4251-4273Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s40430-017-0884-8
Keywords
Calophyllum inophyllum; Antioxidants; Oxidation stability; Thermal stability; Storage stability; Response surface methodology
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Funding
- Human Resource Development Group, Council of Scientific and Industrial Research (CSIR), Delhi
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'Fuel stability' is one of the most significant properties of biodiesel, which insists the biodiesel stability during prolonged storage period. This paper investigates the effects of commercially available and cheap synthetic antioxidants (PY-pyrogallol, PG-propyl gallate, TBHQ-tert-butylhydroxyquinone, BHT-butylated hydroxytoluene, BHA-butylated hydroxyanisole) on the accelerated oxidation stability, storage stability and thermal stability of Calophyllum inophyllum biodiesel. Characterization of biodiesel oxidation variability regarding different antioxidants was evaluated using Fourier Transform Infra-red (FTIR) spectroscopy by analyzing the FTIR spectrum regions of C-H bonds of the respective antioxidants/biodiesel blends. TBHQ dosed with pure biodiesel (B20D3) enhances the thermal stability by 12.05%, storage stability by 8.13% and oxidation stability by 25.27%, when compared to those of biodiesel blend (B20) without any antioxidant. The order of effectiveness of antioxidants at constant 1000 ppm concentration with pure biodiesel is obtained as TBHQ > PG > PY > BHT > BHA. B20D3 has been evaluated for the combined effects of varying injection timing (IT) (21 degrees-24 degrees BTDC) and compression ratio (CR) (16.5:1-18:1) on engine characteristics through experimental investigation and response surface methodology optimization. CR of 17.5 and IT of 23 degrees BTDC were found to be optimal values for superior performance and lower emissions with composite desirability of 0.785.
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