Solubility levulinic acid in subritical carbon dioxide method from rice bran with and without ethanol-water mixture
Siti Zullaikah, Yunita Ali Pujiastuti
Institut Teknologi Sepuluh Nopember
Jalan Raya ITS, Surabaya, Indonesia
Abstract
Rice (oryza sativa) bran is a byproduct generated in the process of rice milling. Moreover, subcritical method as a promising alternative solvent for chemical reaction, separation and extraction process and its nontoxic, inexpensive and invorementally benign, to increase levulinic acid in subcritical needs to be studied with ethanol-water mixture. While, ethanol is capable of hydrogen bonding and dipole-dipole interaction with organic acid and it is conveniently available and stable for hydrogenation. At the same time, carbon dioxide was use as a pressurizing gas and the solvent etanol-water mixture with the concentration (0:100, 25:75, 50:50) with the temperature was used at 160, 180 and 200 0C for 20, 30, 40, 50 and 60 minute reaction in the reactor.
Keywords: levulinic acid, rice bran, subcritical method, hydrolisis, ethanol-water mixture
Topic: Chemical Engineering