稻草秸秆超低酸水解及水解产物分析_王为国.pdfVIP

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稻草秸秆超低酸水解及水解产物分析_王为国.pdf

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稻草秸秆超低酸水解及水解产物分析_王为国

w 0.05 0.050 0 g/mL700 r/min160210 160 170200 210 1000 8144201303 0339 07 TQ 352.78 A Wang WeiguoLi Zihao Qin YuanhangLü Renliang Zhang JunfengWang Cunwen Key Laboratory for Green Chemical Process of Ministry of EducationWuhan Institute of TechnologyWuhan Hubei 430074China The hydrolysis of rice straw with extremely dilute sulfuric acid(0.05(w)) was conducted. It was found that the optimal solid content and stirring speed for the rice straw hydrolysis were 0.050 0 g/mL and 700 r/min respectively. The change of the hydrolysis with time was investigated in the temperature range of 160210 . The results indicated that in the hydrolysis there was a single-peak of reducing sugar content at 160 in the temperature range of 170200 there was a double-peakand a single-peak reappeared at 210 . The reason was that the reducing sugar concentration from the hydrolysis of hemicellulose and cellulose showed two peaksand the peaks superimposed or separated as the hydrolysis temperature changed. The hydrolysis products and solid residues were characterized by means of FTIR and HPLC. The results showed thatmost of hemicellulose hydrolyzed and disappearedthe structure of the lignin was destroyed to a certain extentthe polymerization degree of the cellulose decreased greatly but its crystallinity was still high. The main hydrolysis products were cellotriosecellobioseglucosexylosemethylglyoxal and some unknown compounds.