Abstract
Corn cobs are the main waste of corn farming. Corncobs biomass waste chemically contains carbon and hydrogen which can be pyrolised to produce liquid smoke for food preservation. The aim of this study is to observe the effects of pyrolysis time and temperature as well as the particle size of corncobs to the yield of pyrolysis products. The discussion is limited to liquid smoke products. The experiments were performed by pyrolysing sun-dried corncobs at a certain weight and particle size in a slow heating rate pyrolysis equipment at a targeted residence time and temperature. The results of this study showed that the optimum yield of the liquid smoke was 48% and achieved at an optimum time, temperature and particle size of corncobs of 2.5 hours, 400 oC and 1 inch, respectively. The effect of pyrolysis time (t) on the yield of liquid smoke (Y) from corn cobs in this study could be represented quite well by an empirical equation of Y (%) = 33.57 + 0.024t + 9.10-04.t2 – 4.10-06t3. The empirical equation of the effect of pyrolysis temperature (T) on liquid smoke yield (Y) could be quite well represented by the equation Y (%) = 21.19 + 0.071T + 6.10-05T2 – 2.10-07T3. The characteristics of the liquid smoke produced from this study have a density of 1.05 g / mL, pH of 1.9, brown-red color, and corn-smoke like smell.
Published Version
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