丙酸锌合成工艺研究毕业论文

本科生毕业设计（论文）I摘要丙酸锌是一种新型食品添加剂，属于丙酸盐的一种。食品添加剂丙酸锌不仅能延长食品的保质期，而且其中的锌离子还是人体代谢所需要的微量元素，一定条件下丙酸锌中所分解出来的丙酸也是人体和动物代谢的中间产物。除此之外，丙酸锌还能治疗由霉菌引起的皮肤病。因此，合成具有防腐和补锌双重作用的丙酸锌具有十分重要的意义。本文以丙酸钙与硫酸锌为原料，以去离子水为溶剂，采用复分解的方法（即丙酸钙法），探讨了食品添加剂丙酸锌的最佳合成工艺条件，同时运用红外光谱分析对目标产物进行了表征。其主要内容与结论如下：在常规水浴加热条件下，考察了反应温度、反应时间、物料摩尔比（丙酸钙比硫酸锌)、去离子水量、搅拌频率等因素对丙酸锌产率以及纯度的影响，确定了食品添加剂丙酸锌制备的最佳工艺条件。实验结果表明，反应温度80℃，反应时间40min，物料摩尔比1.2:1，去离子水量约为55mL，在最佳工艺条件下丙酸锌产率可达89.4%。关键词：丙酸锌；防腐剂；丙酸钙；复分解法本科生毕业设计（论文）IIAbstractZincpropionateisanewfoodadditive,belongstoakindofpropionicacidsalt.Zincpropionateasfoodadditivecannotonlyprolongthetimeforeatingthefood,butalsothezincionsofzincpropionateastraceelementsareneededbyhumanbodymetabolism,thepropionicacidinthedecompositionofzincpropionatealsoarethemiddleofthemetabolismproductofhumanandanimal.Therefore,thesynthesisofanticorrosiveandzincsupplementationofzincpropionatehasveryimportantsignificance.Inthispaper,withthewaterasthesolvent,zincpropionatewassynthesizedfromcalciumpropionateandzincsulfateastherawmaterialundertheconditionofconventionalwaterbathheating,usingcomplexdecompositionmethod.TheproductwastestedbyIRspectracoordinationmethod.Themaincontentsandconclusionsareasfollows:Thesynthesisforthetechnologicalconditionsofzincpropionatewasdiscussedundertheconditionofconventionalwaterbathheating,alloftheeffectsofthereactiontemperature,thereactiontime,materialmoleration(propionicacid):n(zincoxide),deionizedwater,stirringfrequency,makesuretheoptimumconditionsforpreparationoffoodadditives,zincpropionate.Experimentalresuitsshowthatthereactiontemperaturewas80℃,thereactiontimewas40min,thefeedration(propionicacid):n(zincoxide)was1.2:1,thedeionizedwaterwas55mL.Theyieldofzincpropionateundertheoptimumtechnologicalconditionswas89.4%.Keywords:Zincpropionate,preservative,calciumpropionate,complexdecompositionmethod本科生毕业设计（论文）III目录第1章绪论..................................................................................................................11.1研究背景与研究意义.......................................................................................11.2食品添加剂.......................................................................................................21.3红外光谱分析....................................................................................................31.4丙酸的性质、用途及防腐机理........................................................................41.4.1丙酸的物理性质.....................................................................................41.4.2丙酸的化学性质.....................................................................................41.4.3丙酸的用途.............................................................................................41.4.4丙酸的防腐机理....................................................................................41.5丙酸盐的性质、用途及研究现状...................................................................51.5.1丙酸钠.....................................................................................................51.5.2丙酸钙....................................................................................................51.5.3丙酸锌....................................................................................................61.6丙酸锌合成工艺研究........................................................................................71.6.1微波水热法制备丙酸锌........................................................................71.6.2传统水热法制备丙酸锌.........................................................................71.7研究目的与研究内容........................................................................................8第2章实验部分..........................................................................................................102.1实验试剂.........................................................................................................102.2实验器材..........................................................................................................102.3实验步骤.........................................................................................................112.3.1中间体丙酸钙的合成工艺条件的考察...............................................112.3.2丙酸锌的合成工艺条件的考察...........................................................112.4计算方法.........................................................................................................13第3章结果与讨论......................................................................................................143.1反应温度对中间体丙酸钙产率的影响..........................................................143.2固液比对中间体丙酸钙产率的影响.............................................................153.3反应温度对丙酸锌产率的影响.....................................................................163.4反应时间对丙酸锌产率的影响......................................................................173.5物料摩尔比对丙酸锌产率的影响..................................................................18本科生毕业设计（论文）IV3.6去离子水用量比对丙酸锌产率的影响..........................................................203.7搅拌频率比对丙酸锌产率的影响..................................................................213.8浓缩时间比对丙酸锌产率的影响...................