ESI-MS法对重烷基苯烃基结构的研究

采用多种分析手段,其中以电喷雾质谱为主的方法研究了重烷基苯的烃基结构。首先通过柱色谱法对重烷基苯进行分离,将其分成了六个族组分。通过各族组分的红外、紫外鉴定,确定它们各自的归属,用电喷雾质谱测定Ⅱ～Ⅴ族组分磺酸盐的相对分子量分布,结合红外、紫外测定的结果及每族物质的不饱和度和通式,推算出了烷基芳烃部分的相对分子质量和烷基的碳数分布。重烷基苯中几个主要成分的碳数分布为:其中二烷基苯的碳数分布在10～25之间,单烷基苯的碳数分布在10～25之间,烷基萘的碳数分布在5～20之间,烷基二联苯的碳数分布在4～19之间。

Study on alkyl radical structure of heavy alkylbenzene with ESI-MS method

In this article, alkyl radical structure of heavy alkylbenzene is studied mainly with ESI-MS method.Firstly,we successfully divide the mixture into six groups in column chromatography. Each group is charaterized by IR and UV,by analysing the IR and UV spectrum we can in general identify what kind of substance each group belongs to. Then the relative molecular weight contribution of sulfonate from the second to the fifth group-type is determined with ESI-MS together with the result by IR and UV spectrum. So we can conclude the relative molecular weight of alkyl aromatic components and the carbon number contribution of alkylbenzene. And carbon number contribution of main components in heavy alkylbenzene is: dialkyl benzene is 10～25; monoalkyl benzene is 10～25; alkyl naphthalene is 5～20; alkyl dibiphenyl is 4～19.