稀土改性固体超强酸催化剂SO_4_2_TiO_2_La_2O_3的制备(6)

第28卷第3期 杨水金等:稀土改性固体超强酸催化剂SO2-/TiO2 La2O3的制备及其催化性能4

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PREPARATIONANDCATALYTICACTIVITYOFSO

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/TiO2 La2O3

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YANGShui jin, HUANGYong kui, BAIAi min, YANGYun, SUNJu tang

(1.CollegeofChemistryandEnvironmentalEngineering,HubeiKeyLaboratoryofPollutantAnalysis&

ReuseTechnology,HubeiNormalUniversity,Huangshi435002,China;

2.CollegeofChemistryandMolecularSciences,WuhanUniversity,Wuhan430072,China)Abstract:SO4/TiO2 La2O3,anovelsolidsuperacid,waspreparedanditscatalyticactivitiesatdifferentsyntheticconditionswereanalyzedwithesterificationofn butanoicacidandn butylalcoholasprobingre action.Theoptimumconditionswereasfollow:moleratioofn(La) n(Ti)of1 34,thesoaked

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consistencyofH2SO4of0 8mol L,thesoakedtimeofH2SO4of24h,thecalciningtemperatureof480!,thecalciningtimeof3h.Thecatalyzerpreparedundertheoptimalconditionswasappliedinthecatalyticsynthesisoftenimportantketalsandacetalsascatalystandexhibitedhighcatalyticactivity.Theyieldsofketalsandacetalscanreach41 4%~95 8%whenthemolarratioofaldehyde/ketonetoglycolis1 1 5,themassratioofthecatalystusedinthereactantsis0 5%,andthereactiontimeis1 0h.Keywords:SO4/TiO2 La2O3;rareearth;solidsuperacid;catalysis(上接第31页)

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(责任编辑:叶红波)

OPTIMIZATIONONEXTRACTIONCONDITIONSOF

FLAVONOIDSFROMGINKGOBILOBALEAFUSINGRESPONSESURFACEMETHODOLOGY

ZHAOHua, ZHANGHui ming, DONGYin mao, DUXiao wei, HECong fen,PINan

(1.BeijingKeyLaboratoryofPlantResourcesResearchandDevelopment,

BeijingTechnologyandBusinessUniversity,Beijing100048,China;

2.PharmaceuticalCollege,HeilongjiangUniversityofChineseMedicine,Harbin150040,China)Abstract:ThearticleaimwastostudythemaximumextractionconditionsofflavonoidsfromGinkgobi lobabywater.WithdriedGinkgobilobapowderasmaterialandwaterassolven,tbyusingresponsesur facemethodology,theeffectsofextractingtemperature,extractingtimeandratioofmaterialtosolventwerestudied,andthentheregressionmodelwasestablishedtostudytheextractingcondition.Theresultoffractionalfactorialdesignindicatedthatextractingtimeandratioofmaterialtosolventplayedimportantrolesinflavonoidsextracting.Theregressionmodelofextractionrate(Y1)toethanolconcentration(X2)andratioofmaterialtosolvent(X3)wasY1=6 423667+0 161*X1+0 68425*X2-0 52375*X3-0 660083*X1*X1+0 1745*X1*X2-0 6575*X1*X3-0 534583*X2*X2-0 0135*X2*X3-1 527583*X3*X3,andtheoptimumconditionswereratioofmaterialtosolvent1 13 76,time3 70h,andtemperature93 37!.Themaximumextractionratepredictedbythemodelwas6 754%.Finalresultsshowthatresponsesurfacemethodologywasagoodmethodforoptimizingextrac tionconditionsofflavonoids.

Keywords:responsesurfacemethodology;ginkgobilobalea;fflavonoid;extraction

(责任编辑:邓清燕)

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