2，6-二甲基萘合成工艺研究新进展

介绍了近年来国内外对合成PEN的基本原料2,6-二甲基萘研究开发的一些新工艺路线,重点是介绍以甲苯、二甲苯、混合二甲苯、萘、甲基萘和丁二烯等原料的工艺路线。一般通过烷基化、环化、脱氢和异构化等反应步骤合成2,6-二甲基萘。其中以邻二甲苯与丁二烯为起始原料报道最多:第1步反应生成OTP的选择性为80%,其后环化转化率达100%,接着进行脱氢反应,反应转化率达90%以上,反应得到的1,5-DMN和1,6-DMN的总选择性大于90%。这两个异构体容易异构化为富含2,6-DMN的混合物,再经过结晶和分离即得2,6-DMN产物,这是一条适合规模工业化生产的路线。

The Research Propress on Synthesis of 2,6-Dimethylnaphthalene

The basic raw material of 2,6-Dimethylnaphthalene(2,6-DMN) for production polethylene naphthalate(PEN) is reviewed. The research progress on synthesis and extraction of 2,6-Dimethylnaphthalene reviewed in detail. Which included directly from C10 aromatic hydrocarbon, coal and petroleum tar, and it could also be synthesis using toluene, xylene, naphthalene or methylnaphthalene and other raw materials as starting material by a series of reaction. For example as o-xylene/buyadiene as raw material synthesis of 2,6-DMN through alkylate, cyclization, dehydrogenation and isomerization. The o-xylene/butadiene line optimum process condition for synthesis 2,6-DMN as follow: o-xyleue with butadiene to produce OTP, its selectivity up to 80%; OTP under optimum conduction get on to cyclization reaction to produce 1,5-DMT, with conversion rate of 100%, and selectivity of 1,5-DMT up to 98%, following dehydrogenation reaction to produce 1,5-DMN/1,6-DMN and other isomer, that the reaction conversion rate could reach more than 90%, the total selectivity of 1,5-DMN and 1,6-DMN more than 90%, and then the 2,6-DMN were obtained by crystallization and breakaway.