Research on the production of dialkylpoylcondensed aromatic hydrocarbons

对萘和2-甲基萘进行了烷基化反应，并对反应产物进行了详细分析。考察了反应条件与产物收率的关系。对二烷基萘的异构化反应进行了研究。研究了2，6-二异丙基萘和2-甲基-6-叔丁基萘的硫脲加成反应，以分离2，6-二烷基-萘混合物中的2，6-异构体。在适宜的异构化反应条件下，考察了烷基化试剂种类、反应温度、反应时间等烷基化反应条件对2，6-二烷基和2，7-二烷基-2，7-萘异构体的分离效果，并通过硫脲加合反应从二烷基-2，6-萘异构体中分离出2，6-二烷基-萘。通过重复2-7次硫脲加合反应，从相应混合物中分离出纯度大于99%的2，6-二烷基萘。

Alkylation of naphthalene and 2-methylnaphthalene was performed, and their reaction products were analyzed in detail. The relation between reaction conditions and yield of products was investigated. Isomerization of dialkylnaphthalenes was also studied. Thiourea adductions of 2,6-diisopropylnaphthalene and of 2-methyl-6-t-butyl-naphthalene were examined in order to isolate 2,6-isomers from mixtures of dialkylnaphthalenes.Dialkylnaphthalenes were produced in alkylation of monoalkyl-naphthalenes, which were also obtained in the consecutive reactions of naphthalene with alkylating reagents. Preferable reaction conditions of alkylation, including the kind of alkylating reagents, reaction temperature, and reaction time, were suggested to produce 2,6- and 2,7-dialkylnaphthalenes in cooperation with the suitable reaction condition of isomerization.Thiourea adduction was well performed to isolate 2,6-dialkyl-naphthalene from the mixtures of dialkylnaphthalene isomers. Dialkylnaphthalenes of 2,6-isomers, more than 99 % of purity, were separated from corresponding mixtures by repeating 2 - 7 times of thiourea adduction.