西安工程大学学报
西安工程大學學報
서안공정대학학보
JOURNAL OF XI'AN POLYTECHNIC UNIVERSITY
2015年
3期
301-306
,共6页
玉米秸秆%稀硫酸%响应曲面
玉米秸稈%稀硫痠%響應麯麵
옥미갈간%희류산%향응곡면
corn stalks%dilute sulfuric acid%response surface
为了提高玉米秸秆稀硫酸预处理效果，对影响稀硫酸预处理玉米秸秆的因素如温度、时间、稀硫酸质量浓度、固液比进行了单因素实验，确定了影响参数．对实验参数采用响应曲面法对稀硫酸预处理的工艺参数进行了优化处理，使用Design Expert 8.05b软件对实验进行拟合，得到二元多次回归方程：Y ＝31.17＋4.25 X1＋1.23 X2＋0.61 X3－0.96 X1 X2－0.22 X1 X3－0.16 X2 X3－6.29 X21－2.86 X22－4.57 X23，由此得到最佳制备工艺条件为温度121.59℃，处理时间60.84min、稀硫酸的质量分数1.07％．在此条件下还原糖的得率为31．98％．在计算的最佳工艺条件下经过电子扫描显微镜（SEM ）观察发现，秸秆表面出现很多形如蜂窝状的空隙．通过红外光谱发现，木质素和半纤维素的吸收峰强度降低；通过X‐射线衍射（X RD ）表征发现稀硫酸处理60min时结晶度变化不大，说明秸秆在硫酸作用下发生了降解反应，实验获得还原糖得率为32.6％，理论和实验处理结果吻合．
為瞭提高玉米秸稈稀硫痠預處理效果，對影響稀硫痠預處理玉米秸稈的因素如溫度、時間、稀硫痠質量濃度、固液比進行瞭單因素實驗，確定瞭影響參數．對實驗參數採用響應麯麵法對稀硫痠預處理的工藝參數進行瞭優化處理，使用Design Expert 8.05b軟件對實驗進行擬閤，得到二元多次迴歸方程：Y ＝31.17＋4.25 X1＋1.23 X2＋0.61 X3－0.96 X1 X2－0.22 X1 X3－0.16 X2 X3－6.29 X21－2.86 X22－4.57 X23，由此得到最佳製備工藝條件為溫度121.59℃，處理時間60.84min、稀硫痠的質量分數1.07％．在此條件下還原糖的得率為31．98％．在計算的最佳工藝條件下經過電子掃描顯微鏡（SEM ）觀察髮現，秸稈錶麵齣現很多形如蜂窩狀的空隙．通過紅外光譜髮現，木質素和半纖維素的吸收峰彊度降低；通過X‐射線衍射（X RD ）錶徵髮現稀硫痠處理60min時結晶度變化不大，說明秸稈在硫痠作用下髮生瞭降解反應，實驗穫得還原糖得率為32.6％，理論和實驗處理結果吻閤．
위료제고옥미갈간희류산예처리효과，대영향희류산예처리옥미갈간적인소여온도、시간、희류산질량농도、고액비진행료단인소실험，학정료영향삼수．대실험삼수채용향응곡면법대희류산예처리적공예삼수진행료우화처리，사용Design Expert 8.05b연건대실험진행의합，득도이원다차회귀방정：Y ＝31.17＋4.25 X1＋1.23 X2＋0.61 X3－0.96 X1 X2－0.22 X1 X3－0.16 X2 X3－6.29 X21－2.86 X22－4.57 X23，유차득도최가제비공예조건위온도121.59℃，처리시간60.84min、희류산적질량분수1.07％．재차조건하환원당적득솔위31．98％．재계산적최가공예조건하경과전자소묘현미경（SEM ）관찰발현，갈간표면출현흔다형여봉와상적공극．통과홍외광보발현，목질소화반섬유소적흡수봉강도강저；통과X‐사선연사（X RD ）표정발현희류산처리60min시결정도변화불대，설명갈간재류산작용하발생료강해반응，실험획득환원당득솔위32.6％，이론화실험처리결과문합．
In order to improve the effect of pretreating corn stover with dilute sulfuric acid each factor , including temperature ,time ,sulfuric acid concentration ,the ratio between solid and liquid ,was deter‐mined .These experimental factors were optimizated using response surface .The three factors calcula‐tion was made by Design Expert 8.05b software .The equation was obtained as follows Y=31.17+4. 25 X1 +1. 23 X2 +0. 61 X3 -0. 96 X1 X2 -0. 22 X1 X3 -0. 16 X2 X3 -6. 29 X21 -2. 86 X22 -4. 57 X23 .T he optimal condition is obtained as follow s:temperature of 121. 59℃ ,time of 60. 84min and dilute sulfuric acid concentration of 1.07% .Under the optimal condition ,the SEM results indicated that on corn stover surfaces appear many holes and some look like honeycomb voids .Infrared spectroscopy showed that the absorption peak intensity of lignin and hemicellulose reduced .XRD indicated that the corn stover degradated in sulfuric acid because crystallinity changed little after dilute sulfuric acid treatment . The reducing sugar yield is 31.98% theoretically and 32.6% experimentally ,which corresponds with each other .
