1 research outputs found
Heat Treatment of Spent Liquors to Recover Chemically Bound Xylose and Alcohol
SO<sub>2</sub>–ethanol–water
(SEW) and SO<sub>2</sub>–isopropanol–water (SPW) spent
liquors are obtained
by fractionating sugarcane straw. The SEW and SPW liquors contain
significant amounts of chemically bound xylose as ethyl xylosides
(EX) and isopropyl xylosides (PX) respectively. The liquors are subjected
to a constant temperature heat treatment to hydrolyze the alkyl xylosides
to allow full recovery of xylose and alcohol. Complete hydrolysis
of EX and PX is achieved at 121 °C in 70 and 30 min, respectively.
The first-order kinetics of EX and PX hydrolysis are determined at
temperatures from 100 to 121 °C. At full hydrolysis of the alkyl
xylosides, the quantity of alcohol produced is greater than stoichiometric.
Other sources of covalently bound alcohols in the spent liquors are
identified to explain the excess alcohol produced