桉木热水预水解过程中木糖反应动力学的研究
|
摘要
研究了桉木热水预水解生成木糖水解液的反应动力学,分别测定了不同热水预水解条件下木糖质量浓度及其降解产物糠醛的质量浓度。研究表明,以木糖质量浓度及糠醛的质量浓度为指标,确定桉木最佳热水预水解条件为:液比1∶8,水解温度170℃,保温时间105 min。此条件下,预水解液中木糖和糠醛质量浓度分别为7. 97 g/L、1. 74 g/L,桉木热水预水解生成木糖的反应活化能为72. 62 kJ/mol。
In this study,the reaction kinetics of xylose hydrolysate from eucalyptus autohydrolysis was investigated through analyzing mass concentrations of xylose and its degradation product furfural under different prehydrolysis conditions. The evaluated activation energy of xylose was 72.62 k J/mol according to the established reaction kinetic equation. The optimization of experimental parameters including wood to liquor ratio,hydrolysis temperature,and time was accomplished to determine the optimized hydrolysis conditions as follows: wood to liquor ratio 1∶8,hydrolysis temperature 170℃,time 105 min. Under this condition,the mass concentrations of xylose and furfural in the hydrolysate were7.97 g/L and 1.74 g/L respectively.
In this study,the reaction kinetics of xylose hydrolysate from eucalyptus autohydrolysis was investigated through analyzing mass concentrations of xylose and its degradation product furfural under different prehydrolysis conditions. The evaluated activation energy of xylose was 72.62 k J/mol according to the established reaction kinetic equation. The optimization of experimental parameters including wood to liquor ratio,hydrolysis temperature,and time was accomplished to determine the optimized hydrolysis conditions as follows: wood to liquor ratio 1∶8,hydrolysis temperature 170℃,time 105 min. Under this condition,the mass concentrations of xylose and furfural in the hydrolysate were7.97 g/L and 1.74 g/L respectively.
引文
[1]Fu LianHua,Meng LingYan,Li Ya Yu,et al.Comparative study of water-soluble and alkali-soluble hemicelluloses extracted by hydrothermal pretreatmeat[J].Paper and Biomaterials,2017,2(1):1.
[2]Fu LianHua,Liu Shan,Li ShuMing,et al.Characterization of Hemicelluloses Extracted From Populus Tomentosa Carr.by the Hydrothermal Method with Ethanol[J].Paper and Biomaterials,2017,2(3):1.
[3]GUO Kaiyuan,SHI Haiqiang,CAO Nan,et al.Effects of Acetic Acid-strengthened Hydrothermal Prehydrolysis on the Dissolution of Hemicelluloses from Acacia Wood and the Component and Structure of the Hemicelluloses[J].Transactions of China Pulp and Paper,2018,33(3):1.郭凯原,石海强,曹楠,等.乙酸强化水热预水解对相思木半纤维素溶出及组分与结构的影响[J].中国造纸学报,2018,33(3):1.
[4]Mussatto S I,Roberto I C.Kinetic behavior of Candida guilliermondii yeast during xylitol production from highly concentrated hydrolysate[J].Process Biochemistry,2004,39(11):1433.
[5]ZHAO Xu-hong,SHI Hai-qiang,ZHANG Jian,et al.The content of soluble lignin and furfural in wood fiber prehydrolysate was determined by UV-spectrophotometry[J].Journal of Chemical Industry,2015,66(6):2295.赵旭红,石海强,张健,等.紫外光谱定量测定木质纤维预水解液中溶解性木素和糠醛含量[J].化工学报,2015,66(6):2295.
[6]GAO Hong-ling,PANG Bo,DU Jian,et al.Green preparation process and development trend of hemicellulose conversion of furfural[J].Paper and Paper Making,2015,34(8):13.高红玲,庞博,杜健,等.半纤维素转化为糠醛的绿色制备工艺及发展趋势[J].纸和造纸,2015,34(8):13.
[7]SUN Yong,ZHANG Jin-ping,YANG Gang,et al.Kinetic studies of hydrochloric acid hydrolysis of xylan in corn straw[J].Chemical Engineering,2007(10):49.孙勇,张金平,杨刚,等.盐酸水解玉米秸秆木聚糖的动力学研究[J].化学工程,2007(10):49.
[8]BIN Dong-ming.Study on the technology and mechanism of pre-extraction of hemicellulose before sugar cane bagasse pulping[D].Nan-ning:Guangxi University,2009.宾东明.甘蔗渣制浆前预抽提半纤维素的工艺及机理研究[D].南宁:广西大学,2009.
[9]ZHAN Huan-yu,LIU Qiu-juan,CHEN Jia-chuan,et al.Pulp Principle and Engineering[M].Beijing:Chinese Light Industry Press,2011.詹怀宇,刘秋娟,陈嘉川,等.制浆原理与工程[M].北京:中国轻工业出版社,2011.
[10]JIN Qiang,ZHANG Hong-man,XU Rui,et al.Hydrolysis kinetics of hemicellulose dilute acid cycle spray filtration[J].Journal of Chemical Industry,2011,62(1):103.金强,张红漫,徐锐,等.半纤维素稀酸循环喷淋冲滤水解动力学[J].化工学报,2011,62(1):103.
[11]DENG Yuan-de.Study on hydrolysis kinetics of wheat straw hemicellulose in formic acid-hydrochloric acid mixed solution[J].Food Technology,2010,35(8):157.邓远德.麦草半纤维素在甲酸-盐酸混合溶液中水解动力学研究[J].食品科技,2010,35(8):157.
[12]YUE Chang-hai,BO De-chen,LI Ping-li.Kinetics of acetic acid hydrolysis of xylan in corncob[J].Chemical Engineering,2011,39(9):16.岳昌海,薄德臣,李凭力.醋酸水解玉米芯中聚木糖的动力学[J].化学工程,2011,39(9):16.
[13]TAN Lihong,MA Lefan,LIU Dingjun,et al.Research of Dissolution Kinetics of Water Prehydrolyzed Hemicellulose of Bamboo[J].Transactions of China Pulp and Paper,2012,27(3):33.谭丽红,马乐凡,刘定军,等.楠竹水预水解半纤维素溶出动力学的研究[J].中国造纸学报,2012,27(3):33.
[2]Fu LianHua,Liu Shan,Li ShuMing,et al.Characterization of Hemicelluloses Extracted From Populus Tomentosa Carr.by the Hydrothermal Method with Ethanol[J].Paper and Biomaterials,2017,2(3):1.
[3]GUO Kaiyuan,SHI Haiqiang,CAO Nan,et al.Effects of Acetic Acid-strengthened Hydrothermal Prehydrolysis on the Dissolution of Hemicelluloses from Acacia Wood and the Component and Structure of the Hemicelluloses[J].Transactions of China Pulp and Paper,2018,33(3):1.郭凯原,石海强,曹楠,等.乙酸强化水热预水解对相思木半纤维素溶出及组分与结构的影响[J].中国造纸学报,2018,33(3):1.
[4]Mussatto S I,Roberto I C.Kinetic behavior of Candida guilliermondii yeast during xylitol production from highly concentrated hydrolysate[J].Process Biochemistry,2004,39(11):1433.
[5]ZHAO Xu-hong,SHI Hai-qiang,ZHANG Jian,et al.The content of soluble lignin and furfural in wood fiber prehydrolysate was determined by UV-spectrophotometry[J].Journal of Chemical Industry,2015,66(6):2295.赵旭红,石海强,张健,等.紫外光谱定量测定木质纤维预水解液中溶解性木素和糠醛含量[J].化工学报,2015,66(6):2295.
[6]GAO Hong-ling,PANG Bo,DU Jian,et al.Green preparation process and development trend of hemicellulose conversion of furfural[J].Paper and Paper Making,2015,34(8):13.高红玲,庞博,杜健,等.半纤维素转化为糠醛的绿色制备工艺及发展趋势[J].纸和造纸,2015,34(8):13.
[7]SUN Yong,ZHANG Jin-ping,YANG Gang,et al.Kinetic studies of hydrochloric acid hydrolysis of xylan in corn straw[J].Chemical Engineering,2007(10):49.孙勇,张金平,杨刚,等.盐酸水解玉米秸秆木聚糖的动力学研究[J].化学工程,2007(10):49.
[8]BIN Dong-ming.Study on the technology and mechanism of pre-extraction of hemicellulose before sugar cane bagasse pulping[D].Nan-ning:Guangxi University,2009.宾东明.甘蔗渣制浆前预抽提半纤维素的工艺及机理研究[D].南宁:广西大学,2009.
[9]ZHAN Huan-yu,LIU Qiu-juan,CHEN Jia-chuan,et al.Pulp Principle and Engineering[M].Beijing:Chinese Light Industry Press,2011.詹怀宇,刘秋娟,陈嘉川,等.制浆原理与工程[M].北京:中国轻工业出版社,2011.
[10]JIN Qiang,ZHANG Hong-man,XU Rui,et al.Hydrolysis kinetics of hemicellulose dilute acid cycle spray filtration[J].Journal of Chemical Industry,2011,62(1):103.金强,张红漫,徐锐,等.半纤维素稀酸循环喷淋冲滤水解动力学[J].化工学报,2011,62(1):103.
[11]DENG Yuan-de.Study on hydrolysis kinetics of wheat straw hemicellulose in formic acid-hydrochloric acid mixed solution[J].Food Technology,2010,35(8):157.邓远德.麦草半纤维素在甲酸-盐酸混合溶液中水解动力学研究[J].食品科技,2010,35(8):157.
[12]YUE Chang-hai,BO De-chen,LI Ping-li.Kinetics of acetic acid hydrolysis of xylan in corncob[J].Chemical Engineering,2011,39(9):16.岳昌海,薄德臣,李凭力.醋酸水解玉米芯中聚木糖的动力学[J].化学工程,2011,39(9):16.
[13]TAN Lihong,MA Lefan,LIU Dingjun,et al.Research of Dissolution Kinetics of Water Prehydrolyzed Hemicellulose of Bamboo[J].Transactions of China Pulp and Paper,2012,27(3):33.谭丽红,马乐凡,刘定军,等.楠竹水预水解半纤维素溶出动力学的研究[J].中国造纸学报,2012,27(3):33.