2,6-二甲基萘的分离技术进展

Research progress on separation technologies for 2,6-dimethylnaphthalene

分离2,6-DMN常用的方法有蒸馏、萃取、吸附和结晶等。催化裂化柴油、煤焦油和石油裂解重芳烃等原料成分复杂,分离提取2,6-DMN面临挑战;二甲基萘共有10种异构体,沸点接近难以通过精馏分离,还需打破DMN异构体之间的共熔结晶问题,能耗大,生产成本难以控制。目前2,6-DMN进行大规模生产的装置与技术主要集中在欧美和日本等国家,突破对2,6-DMN的分离技术壁垒具有重大的战略意义。

Currently,common methods for separating 2,6-dimethylnaphthalene include adsorption,distillation,extraction,and crystallization.However,the raw materials like catalytic cracking diesel,coal tar,and heavy aromatics from petroleum cracking have complex composition,making the separation and purification of 2,6-dimethylnaphthalene face to challenge.Dimethylnaphthalenes have ten isomers and their boiling points are close to each other,making them difficult to separate by distillation.Additionally,the eutectic crystallization problem among the isomers needs to be addressed,otherwise,which will lead to high energy consumption and difficulties in controlling production cost.At present,the technologies and facilities for large-scale production of 2,6-dimethylnaphthalene are mainly held by the companies in Europe,America,and Japan.Breaking through the technological blockade on 2,6-dimethylnaphthalene is of significant strategic importance to China's companies.