Xylan of corn stover was pretreated with 1%,2%and 3%(w/w)sulfuric acid at relatively low temperatures(90℃,95℃ and 100℃)in a dilute acid cycle sprayflow-through reactor(DCF).The hydrolysis of xylan to its monomeric x...Xylan of corn stover was pretreated with 1%,2%and 3%(w/w)sulfuric acid at relatively low temperatures(90℃,95℃ and 100℃)in a dilute acid cycle sprayflow-through reactor(DCF).The hydrolysis of xylan to its monomeric xylose was modeled by a series offirst-order reactions.Both biphasic and Saeman hydrolysis models were applied tofit the experimental data.The results confirmed that the kinetic data of xylan hydrolysisfitted afirst-order irreversible reaction model and the experimental data.The reaction rates of xylose monomer formation and degradation were sensitive to catalyst concentration and temperature.Higher catalyst concentra-tion and lower reaction temperature result in high xylose yield.The activation energy for xylose formation and degradation were determined to be 112.9 and 101.0 kJ·mol^(-1),respectively.Over 90%theoretical xylose obtained from corn stover can be used to produce ethanol,xylitol and fumaric acid by fermentation.展开更多
基金funded by China Petroleum&Chemical Corporation,the National Natural Science Foundation of China(Grant No.20876078)the United Foundation of National Natural Science Foundation of China and Guangdong Province(No.U0733001)the National Hi-Tech Research and Development Program of China(No.2009AA02Z208).
文摘Xylan of corn stover was pretreated with 1%,2%and 3%(w/w)sulfuric acid at relatively low temperatures(90℃,95℃ and 100℃)in a dilute acid cycle sprayflow-through reactor(DCF).The hydrolysis of xylan to its monomeric xylose was modeled by a series offirst-order reactions.Both biphasic and Saeman hydrolysis models were applied tofit the experimental data.The results confirmed that the kinetic data of xylan hydrolysisfitted afirst-order irreversible reaction model and the experimental data.The reaction rates of xylose monomer formation and degradation were sensitive to catalyst concentration and temperature.Higher catalyst concentra-tion and lower reaction temperature result in high xylose yield.The activation energy for xylose formation and degradation were determined to be 112.9 and 101.0 kJ·mol^(-1),respectively.Over 90%theoretical xylose obtained from corn stover can be used to produce ethanol,xylitol and fumaric acid by fermentation.
