资源描述:
《稀土基磷钨酸催化大豆油与甲醇合成生物柴油和其工艺优化》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、稀土基磷钨酸催化大豆油与甲醇合成生物柴油及其工艺优化李芳浩吴兵蔡锦旺李晨杰韩晓祥*王奎武王彦波*(浙江工商大学应用化学系,杭州310018)摘要:以系列稀土改性磷钨酸为催化剂,大豆油与甲醇为原料进行酯交换反应制备生物柴油,考察各因素对生物柴油产率的影响,并通过响应面分析法优化制备工艺。研究表明,部分取代的稀土基磷钨酸催化剂具有较好的催化酯交换反应活性,其中Ce2/3H1.0PW12O40催化剂显示最好的生物柴油产率(94.4%)和重复使用性能,催化剂中Brφnsted酸中心和Lewis酸中心间的协同效应是其
2、具有高催化性能的原因。响应面分析法优化生物柴油合成的最佳条件为:醇油物质的量比30:1,催化剂量为大豆油质量的6.3%,反应时间20h,反应温度148℃,该条件下生物柴油的产率为96.6%,该结果与模型预测值基本符合。实验结果对以植物油、高酸值餐饮废弃油脂等为原料制备生物柴油提供了一定的理论基础与实践经验。关键词磷钨酸酯交换反应生物柴油响应面法中图分类号:TQ517.2文献标识码:A文章编号:Optimizationandpreparationofbiodieselfromsoybeanoilandme
3、thanolusingrareearthmetalion-exchangedphosphotungsticacidascatalystLiFanghaoWuBingCaiJinwangLiChenjieHanXiaoxiang*WangKuiwuWangYanbo*(DepartmentofAppliedChemistry,ZhejiangGongshangUniversity,Hangzhou310018)Abstract:AseriesofBrønsted-Lewisacidiccatalysts,na
4、melyMxH3–3xPW12O40(M=La,Ce,Pr,Nd,Sm;x=1/3,2/3,1),waspreparedbyincorporatingrareearthmetalcationsasLewiscentersontothesuperacidictungstophosphoricacid.TheeffectsofvariousfactorsonthecatalytictransesterificationofsoybeanoilandmethanolusingMxH3–3xPW12O40ascat
5、alystswerestudied.Thesynthesisprocessofbiodieselwasalsooptimizedbyresponsesurfacemethodology(RSM).Resultsshowedthatthepartiallyion-exchangedcatalystshadsatisfactorycatalyticperformancescomparingwiththepristineH3PW12O40.Amongthem,theCe2/3H1.0PW12O40catalyst
6、exhibitedthebestcatalyticactivitywithsuperiorbiodieselyield(94.4%)andexcellentdurability.ThehighcatalyticactivityforthecatalystwasfoundtoinvokeBrønsted-Lewisacidsynergy.Theoptimumconditionswereasfollows:n(methanol):n(soybeanoil)=30:1,theamountofcatalysttoo
7、il6.3%,reactiontime20handtemperature148℃.Undertheoptimizedconditions,theyieldofbiodieselreached96.6%,whichisinbasicagreementwithvaluespredictedbythemathematicalmodel.Theexperimentalresultsprovideatheoreticalbasisandpracticalexperienceforthepreparationofbio
8、dieselfromvegetableoil,highacidvaluewasteoilasrawmaterials.KeywordsPhosphotungsticacidTransesterificationreactionBiodieselResponsesurfacemethodology生物柴油是指用动植物油脂为原料(大豆油、菜籽油、动物油等)与低碳醇(甲醇,乙醇等)在碱或酸(如NaOH、KOH、浓硫酸等