武汉工程大学本科毕业论文2015届毕业论文题目干法制备羧甲基淀粉专业班级化工04班学号1106010409学生姓名刘玉洁学院化工与制药学院指导教师金士威/欧阳贻德指导教师职称教授/讲师完成日期：2015年6月8日干法制备羧甲基淀粉DryProcessPreparationofCarboxymethylStarch学生姓名刘玉洁指导教师欧阳贻德/金士威PAGE\*MERGEFORMATIPAGE\*MERGEFORMATI摘要羧甲基淀粉（CMS)是一种非常重要的阴离子型醚化淀粉，其用途十分广泛。当今社会对其需求量的日益增大，对其性能要求越来越高，对羧甲基淀粉的研究已逐步受到关注，目前，羧甲基淀粉的生产工艺存在诸多问题，不能完全满足工业生产需要。以玉米淀粉为原料，采用干法制备高取代度的羧甲基淀粉。反应分为碱化和醚化2个阶段，以异丙醇（体积分数为60%）为溶剂，氢氧化钠为碱化剂，氯乙酸钠为醚化剂，对羧甲基淀粉工艺进行了研究。考察了碱化温度、碱化时间、醚化温度、醚化时间等因素对羧甲基淀粉取代度的影响，最终确定最佳的碱化温度为35℃，碱化时间为60min，醚化温度为70℃，醚化时间为150min，在此条件下制得的羧甲基淀粉的取代度为0.32，产品的外观得到改善，淀粉糊的黏度稳定性得到加强。关键词：羧甲基淀粉；干法；制备；取代度；醚化PAGE\*MERGEFORMATIIAbstractCarboxymethylstarch(CMS)isanimportantkindofanionicetherifiedstarch,andiswidelyappliedinmanyareas.Withtheincreasingdemandofsociety,peoplehavepaidmoreattentiontostudycarboxymethylstarchgradually,whichhasbecomeahotspotinrecentyears.Currently,thereisalowdegreeofsubstitution,theviscosityinstabilityofthestarchpaste,poorappearanceandothershortcomingsontheindustrialproductionofcarboxymethylstarchandthereforethatgreatlylimitsitsapplication.Highlysubstitutedcarboxymethylstarchwasproducedbydrymethodusedcornstarchasrawmaterial.Theprocesswasmadeupoftwosteps,thatwasthealkalizingreactionandtheetherifyingreaction.Theisopropylalcohol（whosevolumefractionwas60%)wasusedasasolvent,alkalizingagentwassodiumhydroxideandtheetherifyingagentwassodiumchloroacetate.Theeffectsofthealkalizingtemperatureandreactiontime,theetherifyingtemperatureandreactiontimeonthedegreeofsubstitutionwereconsidered.Ultimately,thebestalkalizingtemperatureis35℃,thereactiontimeis60minutes,theetherifyingtemperatureis70℃andthereactiontimeis150minutes.Undertheaboveconditions,thedegreeofsubstitutionofcarboxymethylstarchcanreach0.32,andtheappearanceoftheproducthasimproved,theviscositystabilityofstarchpastehasbeenstrengthenedtoo.Keywords:carboxymethylstarch;drymethod;preparation;degreeofsubstitution;etherification