【摘 要】
：
乙二醇是一种重要的有机化工原料,主要用于生产聚酯、汽车用冷冻剂等产品。紫外透光率(简称UV值)是衡量聚酯级乙二醇产品质量的一项重要指标。乙二醇UV值不合格,将影响下游产品聚酯的质量,如光泽和色度。研究影响乙二醇UV值的杂质(UV物)的结构及其成因,对于改进乙二醇生产工艺、提高产品质量具有积极的意义。由于影响乙二醇紫外透光率的杂质含量极低,使用气质联用技术或液相色谱手段难以直接进行结构鉴定。本文采用
【机 构】
：
中国石化上海石油化工研究院,上海浦东北路1658号,上海201208
【出 处】
：
第2届大连国际色谱学术报告会、第37届国际高效液相色谱及相关技术会议、第18届全国色谱学术报告会
论文部分内容阅读
乙二醇是一种重要的有机化工原料,主要用于生产聚酯、汽车用冷冻剂等产品。紫外透光率(简称UV值)是衡量聚酯级乙二醇产品质量的一项重要指标。乙二醇UV值不合格,将影响下游产品聚酯的质量,如光泽和色度。研究影响乙二醇UV值的杂质(UV物)的结构及其成因,对于改进乙二醇生产工艺、提高产品质量具有积极的意义。由于影响乙二醇紫外透光率的杂质含量极低,使用气质联用技术或液相色谱手段难以直接进行结构鉴定。本文采用固相萃取(SPE)和GC-MS技术,建立了一种影响乙二醇紫外透光率的痕量杂质的系统分析方法。首先使乙二醇中的UV物在阴离子交换树脂上得到高效富集,再利用固相微萃取和GC--MS对洗脱液进行定性分析。研究证实,在UV值不合格的乙二醇产品及乙二醇精馏塔的塔釜液中存在1,2-环戊二酮类物质,含量为ppm级。由于含有共轭结果,该类物质具有较强的紫外吸收能力,可导致乙二醇UV值显著降低。在UV值不合格的乙二醇产品及乙二醇工艺物料中还发现了乙酸和羟基丙酮。本文首次提出乙二醇中1,2-环戊二酮类物质的形成可能与羟基丙酮在酸催化下发生的缩合反应有着密切的关系,并对乙二醇中1,2-环戊二酮类物质的形成机理进行了详细推断。
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