高取代度醚化淀粉的湿法制备及其絮凝性能研究  

Wet-route preparation of etherified starch with high substitution degree and study on its flocculation properties

作　　者：李海花[1,3] 高玉华 张利辉[1,2] 李娜 刘振法[1,2] Ll Hai-hua;GAO Yu-hua;ZHANG Li-hui;LI Na;LIU Zhen-fa(Institute of Energy Resources,Hebei Academy of Science,Shijiazhuang 050081,China;Hebei Engineering Research Center for Water Saving in Industry,Shijiazhuang 050081,China;Hebei Sunwater Water Treatment Co.,Ltd.,Shijiazhuang 050081,China)

机构地区：[1]河北省科学院能源研究所,河北石家庄050081 [2]河北省工业节水工程技术研究中心,河北石家庄050081 [3]河北桑沃特水处理有限责任公司,河北石家庄050081

出　　处：《现代化工》2020年第4期110-114,118,共6页Modern Chemical Industry

基　　金：国家自然科学基金项目(21376062);河北省自然科学基金和重点基础研究专项(18964005D);河北省科学院科技计划项目(19701,2019Q02)。

摘　　要：以玉米淀粉(St)为原料、2,3-环氧丙基三甲基氯化铵(GTA)为醚化剂,利用湿法合成高取代度的阳离子醚化淀粉絮凝剂St-GTA。通过正交实验对St-GTA的合成条件进行筛选,结果表明,最佳合成条件为:n(CTA)∶n(St)=1. 2∶1、m(NaOH)∶m(St)=0. 08∶1、反应温度为70℃、反应时间为3 h。在该条件下合成的产物取代度可达0. 717 3。以高岭土悬浊液为模拟污水,考察了絮凝剂投加量、絮凝体系pH、絮凝温度、絮凝时间对絮凝效果的影响。结果表明,对于质量分数为2%的高岭土悬浊液,当pH=7、絮凝温度为25℃、絮凝时间为0. 5 h时,St-GTA的最佳质量浓度为8 mg/L,透光率可达92. 81%。St-GTA,an etherified starch flocculant with high substitution degree is synthesized by the wet-route method with corn starch( St) as raw material and 2,3-epoxypropyl trimethylammonium chloride( GTA) as etherifying agent.The synthetic conditions of St-GTA are screened via orthogonal experiment. The optimum synthetic conditions are found as follows: n( CTA) ∶n( St) = 1. 2 ∶1,m( NaOH) ∶m( St) = 0.08 ∶1,reaction temperature is set at 70℃ and reaction time is 3 h. The substitution degree of products can achieve 0. 717 3 under the optimum conditions. Taking kaolin suspension as simulated wastewater,the influences of the dosage of flocculant,p H value of flocculation system,flocculation temperature and flocculation time on flocculation efficiency are investigated. The results indicate that the transmittance can reach 92. 81% for 2 wt% kaolin suspension when pH = 7,flocculation temperature is at 25 ℃,flocculation time is 0. 5 h,and the optimum dosage of St-GTA is 8 mg·L-1.

关 键 词：玉米淀粉 3-氯-2-羟丙基三甲基氯化铵(CTA) 醚化淀粉 湿法合成 取代度 

分 类 号：TQ314.1[化学工程—高聚物工业]