This research aimed to determine the chemical composition of Rawapening, Semarang District, Indonesia water hyacinth and study effect pyrolysis time on volume liquid smoke products. The was cut into pieces with a size about 2 cm 3 cm, placed in pyrolisator. A total 700 g sample fed pyrolysis. product observed for its content hemicellulose, cellulose lignin. carried out at temperature 117 °C, 40...