共查询到17条相似文献,搜索用时 265 毫秒
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以木蹄为原料,采用响应面法优化木蹄多糖的提取工艺。通过单因素试验研究料水比、提取温度和提取时间对多糖得率的影响。应用响应面法对料水比、提取温度和提取时间三个因素进行优化,结果表明,木蹄多糖的最佳提取工艺条件:料水比1:43,提取温度89℃,提取时间4h。多糖得率达到5.68%。 相似文献
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《纤维素科学与技术》2017,(4):23-30
研究利用硝酸-乙醇法制备白酒丢糟微晶纤维素工艺过程。经Na OH水溶液在一定温度和时间下预处理,可除去部分半纤维素和木质素,通过单因素设计,研究硝酸-乙醇提取料液比、温度和时间对微晶纤维素得率、聚合度及纯度的影响,再设计响应面优化试验。结果表明,各因素对丢糟微晶纤维素得率影响显著性表现为:温度时间料液比,并确定白酒丢糟微晶纤维素制备最佳条件:硝酸乙醇处理料液比1∶43 g/m L、处理温度70.1℃、处理时间92.3 min,此条件下,丢糟微晶纤维素得率50.18%,聚合度为286.78 L/g,纯度95.66%。 相似文献
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《应用化工》2017,(5):897-901
为了高产率的制备粒径均一的纳米纤维素。以棉浆粕为原料,采用硫酸溶胀结合超声波处理的方法制备纳米纤维素。采用单因素法系统研究了硫酸溶胀预处理条件和超声功率、超声时间等超声加工条件。优化的工艺为:硫酸质量分数64%,溶胀温度40℃,溶胀时间25 min,超声功率1 000 W,超声时间30 min。在优化工艺条件下,制得的纳米纤维素的产率可以达到54.04%。扫描电镜和透射电镜测试表明所制得的纳米纤维素为针状晶须形态,直径10~30 nm,长度100~300 nm。X-射线衍射分析表明所得纳米纤维素为纤维素Ⅰ型结晶结构,结晶度较棉浆粕略微降低。 相似文献
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《应用化工》2022,(5):897-901
为了高产率的制备粒径均一的纳米纤维素。以棉浆粕为原料,采用硫酸溶胀结合超声波处理的方法制备纳米纤维素。采用单因素法系统研究了硫酸溶胀预处理条件和超声功率、超声时间等超声加工条件。优化的工艺为:硫酸质量分数64%,溶胀温度40℃,溶胀时间25 min,超声功率1 000 W,超声时间30 min。在优化工艺条件下,制得的纳米纤维素的产率可以达到54.04%。扫描电镜和透射电镜测试表明所制得的纳米纤维素为针状晶须形态,直径1030 nm,长度10030 nm,长度100300 nm。X-射线衍射分析表明所得纳米纤维素为纤维素Ⅰ型结晶结构,结晶度较棉浆粕略微降低。 相似文献
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以微晶纤维素(MCC)为原料经硫酸水解制备纤维素纳米晶体(CNC)。采用单因素法结合正交试验系统地研究了硫酸质量分数、反应温度和反应时间对纤维素纳米晶体得率以及平均粒径的影响,并通过扫描电镜(SEM)、原子力显微镜(AFM)、X射线衍射仪(XRD)、纳米激光粒度仪对CNC的性能进行了表征,揭示了酸水解制备CNC的机理。结果表明:CNC制备的最佳工艺参数为硫酸质量分数64%、反应温度45 ℃、反应时间90 min,在此条件下CNC的得率为24.6%,粒径为204.8 nm。CNC水悬浮液呈一种稳定的淡蓝色胶体状态,其微观形貌比较规整,呈短棒状,直径约10~20 nm,长度在150~300 nm之间;XRD结果显示CNC的晶型为纤维素Ⅰ型,结晶度为80.2%。 相似文献
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以杏鲍菇为原料,利用超声辅助法及响应面法对杏鲍菇多糖提取工艺进行研究。首先进行单因素实验,根据单因素的结论进行响应面分析,采用响应面法优化操作条件。实验结果表明最佳工艺为:料液比1︰30,超声功率417.64 W,时间17.78 min,温度50℃。多糖得率为17.095%。 相似文献
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在单因素实验的基础上。采用Box-Behnken设计-效应面法(RSA)对影响茴香油β-CDP微球包合物的制备工艺的主要因素反应温度、β-CDP微球与茴香油投料比、水与伊CDP微球投料比进行了优化,并建立了相应的预测模型。经二次多项数学模型分析得到优化制备条件为:茴香油用量1mL、β-CDP微球用量5.7g、水用量50mL、包合温度40℃、包合时间1h,此条件下茴香油平均包合率为86.9%、微球包合物平均产率为93.9%。经验证。应用效应面法所得到的茴香油β-CDP微球包合物制备工艺是可行的。 相似文献
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Ha-Yull Chung Jiyong Park Jung-Han Kim Un-Yong Kong 《Journal of the American Oil Chemists' Society》1996,73(5):637-643
Effects of the reaction temperature, reaction time, mole ratio of fatty acid methyl esters (FAME) to sorbitol, and mole ratio
of fatty acid sodium soaps (FASS) to sorbitol on yields of sorbitol fatty acid polyester (SFPE) were examined with a response
surface methodology. The optimum reaction conditions selected with response surface analysis were as follows: reaction temperature,
144°C; reaction time, 6.65 h; mole ratio of FAME to sorbitol, 10.7∶1; and mole ratio of FASS to sorbitol, 0.77∶1. Under these
reaction conditions, the experimental yield of sorbitol fatty acid polyester (mean value: 92% range: 89–94%) obtained from
seven replications was close to the predicted value (94%) calculated from the polynomial response surface model equation.
The response surface methodology approach used in this study was able to predict the reaction conditions necessary for a high
yield of sorbitol fatty acid polyester. 相似文献
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Sudha Kochiyil Cherikkallinmel Sankaran Sugunan Binitha Njarakkattuvalappil Narayanan Panichikkal Abdul Faisal Sailas Benjamin 《Korean Journal of Chemical Engineering》2017,34(11):2840-2851
Lithium silicate is one of the suitable heterogeneous catalysts for biodiesel production. The possibilities of large number of combinations of different reaction parameters make the optimization of biodiesel production process over various heterogeneous catalysts highly tedious, necessitating the development of alternate strategies for parameter optimization. Here, Box-Behnken design (BBD) coupled with response surface methodology (RSM) is employed to optimize the process parameters required for the production of biodiesel from waste cooking oil using lithium silicate as catalyst. Simple method of impregnation was performed for the material preparation and the catalyst was analyzed using different techniques. It was found that the activity is directly proportional to the basicity data obtained from temperature programmed desorption (TPD) of CO2 over various catalyst systems. The material exhibits macroporous morphology and the major crystalline phase of the most active catalyst was found to be Li2SiO3. The effects of different reaction parameters were studied and a biodiesel yield of 100% was obtained under the predicted optimum reaction conditions of methanol : oil molar ratio 15 : 1, catalyst amount 7 wt%, reaction temperature 55 °C and reaction time 2.5 h. The validation experiments showed a correlation coefficient of 0.95 between the predicted and experimental yield of biodiesel, which indicates the high significance of the model. The fuel properties of biodiesel obtained under the optimum conditions met the specifications as mentioned in ASTM D6751 and EN 14214 standards. Catalyst heterogeneity and low reaction temperature are the major attractions of the present biodiesel preparation strategy. 相似文献
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