Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Separation of 2,6-dimethylnaphthalene in Dimethylnaphthalene Isomers Mixture by Crystallization Operation

결정화 조작에 의한 Dimethylnaphthalene 이성체 혼합물 중의 2,6-dimethylnaphthalene의 분리

  • Kang, Ho-Cheol (Convergence Chemistry Division, Korea Research Institutes of Chemical Technology) ;
  • Kim, Su Jin (Department of Cosmetic Science, Chungwoon University)
  • 강호철 (한국화학연구원 융합화학연구본부) ;
  • 김수진 (청운대학교 화장품과학과)
  • Received : 2013.11.19
  • Accepted : 2013.12.17
  • Published : 2014.02.10
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Abstract

Light cycle oil (LCO), one of the by-products of the catalytic cracking gasoline manufacturing process, contains a lot of valuable aromatics. In particular, 2,6-dimethylnaphthalene (2,6-DMN) contained in LCO has been becoming important as the basic material of polyethylene naphthalate plastic and liquid crystal polymer, etc. If it were possible to separate and purify the valuable aromatic hydrocarbons (such as 2,6-DMN) from LCO, which have only been used as fuel mixed with heavy oil, it would be very meaningful in terms of the efficient use of resources. We investigated the high-purity purification of 2,6-DMN by the combined method of melt crystallization (MC) and solute crystallization (SC). The enriched DMN isomer mixtures (concentration of 2,6-DMN : 10.43%) recovered from LCO by distillation-extraction combination and the crystal recovered by MC used as raw materials of MC and SC, respectively. The solvent of SC used was a mixture of methanol and acetone (60 : 40 wt%). The crystal of 2,6-DMN with a high-purity of 99.5% was recovered by MC-SC combination. We confirmed that the MC-SC combination was one of the very useful combinations for the high-purity purification of 2,6-DMN contained in the enriched DMN isomer mixtures.

접촉분해 가솔린 제조공정의 부산물의 하나인 접촉분해경유(LCO)는 많은 유용 방향족 성분을 함유하고 있다. 그 중에서도 특히 2,6-dimethylnaphthalene (2,6-DMN)은 PEN 수지, 고분자 액정 등의 기초 원료로서 주목된다. 지금까지 중유에 혼합되어 연료로서만 사용되고 있는 LCO로부터 2,6-DMN 등과 같은 유용 방향족 탄화수소를 분리, 정제하는 것이 가능하게 되면 자원의 유용이용이라는 관점에서 그 의미는 매우 크다. 본 연구는 melt crystallization (MC)과 solute crystallization (SC)의 조합에 의해 2,6-DMN의 고순도 정제를 검토했다. MC와 SC의 원료로서는 증류-추출 조합에 의해 LCO로부터 회수한 DMN 이성체 혼합물(2,6-DMN의 농도: 10.43%)과 MC로부터 회수한 결정을 각각 사용했다. SC의 용매는 메탄올과 아세톤 혼합물(60 : 40 wt%)을 사용했다. MC-SC의 조합에 의해 99.5%의 2,6-DMN 결정을 회수할 수 있었다. MC-SC는 DMN 이성체 혼합물에 함유된 2,6-DMN의 고순도 정제에 매우 유용한 조합의 하나임을 확인했다.

Keywords

References

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