Lactic acid production by alkaline hydrothermal treatment of corn cobs
2012
Sánchez, Cristina | Egüés, Itziar | García, Araceli | Llano-Ponte, Rodrigo | Labidi, Jalel
An experimental study was carried out for the corn cobs thermal conversion to obtain the maximum content in lactic acid. For this purpose, under the same conditions (275°C and 30min) different concentrations of Ca(OH)₂ as alkaline catalyst were used (from 0.32M to 1M). The maximum content of lactic acid (6.72±0.31g/L) was obtained with 0.7M of Ca(OH)₂. With this catalyst concentration, different reaction conditions were used (250, 275 and 300°C and 15, 30 and 45min). The optimal conditions to produce the highest yield of lactic acid from corn cobs in alkaline conditions were determined at 300°C and 30min, achieving 44.76±2.59% respect to the total cellulose and hemicellulose contained in the initial corn cobs (7.38±0.43g/L of lactic acid).
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