差示扫描量热法表征氯化镁乙醇醇合物结构.pdf

化工进展
2014年第33卷第7期
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
1803
COU/ CNE/w
研究开发
差示扫描量热法表征氯化镁乙醇醇合物结构
岑为,夏先知,刘月祥,毛炳权
(中国石油化工股份有限公可北京化工研究院,北京100013)
摘要:采用差示扫描量热法(DSC)研究了 ETOH/Mgcl22的摩尔比在1.5~2.8的氯化镁乙醇醇合物的结构,研究
表明,该区间的氟化镁乙醇醇合物存在两种稳定的组分,经推断这两种组分分别是MgCl2.8EtOH和
MgC121.5EtOH,它们的熔融峰値分别在115℃和155℃附近,该区间的氟化镁醇合物是由这两种稳定的组分组
成的混合物。另外,氯化镁醇合物的嫁点对水分很敏感,微量的水分会使醇合物的熔点降低。热分析结果显示,
在MgC12.8EtOH醇合物中存在徽量的水分时会在100℃C形成特征峰。对具有微量水分且E(OH/MgCl2的摩尔比
在1.55~2.64的氟化镁醇合物进行减压脱醇时,首先减少的是MgCl2'2.8EtOH组分,其次是MgCl22.8EtOH与
微量水分形成的组分,并且没有水分被脱除掉。
关键词:氯化镁乙醇醇合物;載体;差示扫描量热法;热力学性质;混合物
中图分类号:TQ426,65文献标志码:A
文章编号:1000-6613(2014)07-1803-05
DOI:10.3969issn.1000-6613.2014.07.025
A differential scanning calorimetry investigation of magnesium
choride-ethanol adduct
CEN Wei, XIA Xianzhi, LIU Yuexiang, MAO Bingguan
( Beijing Research Institute of Chemical Industry, SINOPEC, Beijing 100013, China)
Abstract: Magnesium chloride-ethanol adducts (mgcl'netoh prepared over a composition range
of n=1. 5 to 2.8, were studied with differential scanning calorimetry. These adducts comprised of two
stable compounds, Mg C122. 8ETOH and Mg Cl2 1. 5ETOH, showing endothermic peaks at 115C and
155C respectively. In addition, the melting point of the magnesium chloride ethanol adduct which
was very sensitive to water would decrease if trace moisture was present in the adduct. And the
characteristic peak of the adduct containing trace moisture and M Cl2 2. 8E OH was observed at 100C
Moreover, during the dealcoholation of the adducts containing trace moisture with ETOH/Mgcl2 molar
ratio from 1.55 to 2.64, pure Mgcl2.8ETOH was removed firstly and then the compound formed b
trace moisture and Mgcl2: 2.8ETOH was removed. However, water was not removed all the wa
Key words: magnesium chloride-ethanol adduct; catalyst support; differential scanning calorimetry
thermal analysis thermodynamic properties; mixtures
氯化镁乙醇醇合物是制备高效球形丙烯聚合置和分布,从而影响催化剂的活性和选择性。所以,
催化剂的载体?。丙烯聚合催化剂是一个复杂的催化剂的形态、强度、活性、选择性等性质均受到
多组分体系,对于各组分之间的作用关系和催化剂
收稿日期:2014-01-22:修改稿日期:2014-02-28。
结构目前还没有一个统一的结论。催化剂的形态和
基金项目:中国石油化工股份有限公司项目(44-BS1302)。
强度均由载体的结构决定,TiCl4和给电子体均是
第一作者:零为(1984ー),男,博士,工程师,从事聚烯烃催化剂研
分别负载在载体上的,载体中乙醇所占的位置及其
究。E-mailcenw.bjhy(@sinopec.com。联系人:毛炳权,教授,中国工
程院院士,主要从事聚烯烃结构、性能、聚合工艺与催化剂研究。E-mai
分布会通过记忆效应来影响载钛和给电子体的位maoba.bjhy(@sinopec.com