陶瓷膜超滤净化石灰法制糖清汁

2522019,Vol.40,No.02食品科学※工艺技术陶瓷膜超滤净化石灰法制糖清汁李文1,2，朱瓌之3，漆虹3，曲睿晶1，谢彩锋1,*，雷福厚1,2,*，李凯1,4（1.广西大学轻工与食品工程学院，广西南宁530004；2.广西民族大学化学化工学院，广西林产化学与工程重点实验室，广西南宁530008；3.南京工业大学膜科学技术研究所，江苏南京210009；4.广西蔗糖产业协同创新中心，广西南宁530004）摘要：对孔径为0.04μm的陶瓷超滤膜进一步净化石灰法制糖的清汁进行研究，在跨膜压差0.45～0.50MPa、膜面流速4.0～4.5m/s、过滤温度75～97℃的条件下过滤甘蔗汁30h，膜渗透通量从350.6L/（m2·h）降低至160.2L/（m2·h），平均通量为177.8L/（m2·h），能满足工业化生产的需求。甘蔗汁经陶瓷膜过滤后品质被进一步提升，简纯度可提高2.01个单位，色素去除率为20.20%，澄清度从79.18%提升至99.98%。研究膜污染形成发现，陶瓷膜过滤甘蔗汁会在膜表面形成一层污染层，膜污染物的主要成分为有机物（多糖、蛋白质、酯类及酚类等物质），同时还含有少量的Na、Mg、Al、Si、P、Cl、K、Ca及Fe等无机成分。污染膜依次采用工业净水、1%NaOH-0.5%NaClO混合溶液、0.5%HNO3溶液清洗，膜通量恢复率均高于95.5%，重复性较好，是一种有效的膜清洗方法。关键词：陶瓷膜；超滤；制糖；石灰法；清汁RefiningofDefecatedSugarcaneJuiceUsingUltrafiltrationCeramicMembraneLIWen1,2,ZHUGuizhi3,QIHong3,QURuijing1,XIECaifeng1,*,LEIFuhou1,2,*,LIKai1,4(1.CollegeofLightIndustryandFoodEngineering,GuangxiUniversity,Nanning530004,China;2.GuangxiKeyLaboratoryofChemistryandEngineeringofForestProducts,CollegeofChemistryandChemicalEngineering,GuangxiUniversityforNationalities,Nanning530008,China;3.MembraneScienceandTechnologyResearchCenter,NanjingUniversityofTechnology,Nanjing210009,China;4.CollaborativeInnovationCenterofGuangxiSugarcaneIndustry,Nanning530004,China)Abstract:Thisstudyinvestigatedtheapplicationofanultrafiltrationceramicmembrane(0.04μm)torefinedefecatedsugarcanejuice.Thesugarcanejuicewasultrafiltratedfor30hunderthefollowingconditions:transmembranepressuredifference0.45–0.50MPa,crossflowvelocity4.0–4.5m/s,andtemperature75–97℃.Themembranepermeatefluxwasdecreasedfrom350.6to160.2L/(m2·h)duringtheultrafiltrationprocessandtheaveragefluxratewas177.8L/(m2·h),whichcouldmeettherequirementofindustrialproduction.Theapparentpurityofsugarcanejuicewasincreasedby2.01unitsafterultrafiltration,thepercentageremovalofpigmentswas20.20%,andtheclaritywaselevatedfrom79.18%to99.98%.Afoulinglayercompwasformedonthemembranesurfaceduringtheultrafiltrationprocess,whichmainlyconsistedoforganicdepositions(e.g.,polysaccharides,proteins,aliphaticsandphenols)aswellaslesseramountofi