Hydrolysis technology and kinetics of poultry waste to produce amino acids in subcritical water

In order to improve the utilization of bird wastes, the hydrolysis technology optimization and reaction kinetics for amino acid production by extremely low acids in subcritical water have been conducted. In this experiment, the raw material was chicken intestines and the research target was the yield of amino acids. The effects of reaction temperature, reaction time and H2SO4 concentration in reactant system on amino acid yields were investigated using the orthogonal test and the optimum hydrolysis technology conditions were obtained. The experimental results show that the best hydrolysis technology is: reaction temperature 533 K, reaction time 28 min, H2SO4 concentration in reactant system 0.02 wt.%. Under this condition, the amino acid yield reaches 11.49%. The results of chemical reaction kinetics experiment indicate that the total velocity constants of chicken intestine hydrolysis in subcritical water with H2SO4 concentration in reactant system 0.02 wt.% are 1.52 x 10(-2), 3.35 x 10(-2), 11.58 x 10(-2), and 14.01 x 10(-2) at 473 K, 503 K, 533 K. and 553 K respectively. The reaction kinetics order is 1.52, activation energy is 64.44 kJ/mol and the pre-exponential factor is 1.91 x 10(5). (C) 2010 Elsevier B.V. All rights reserved.