2 methylnaphthalene

Wash oil, the feed of this study, was provided by OCI Company Ltd. (Seoul, Korea). Naphthalene (NA, 99% purity), QU (98% purity), IN (≥99% purity), 2-methylNaphthalene (2MNA, 97% purity), 1-methylNaphthalene (1MNA, ≥95% purity), and biphenyl (BP, ≥99.5% purity), which were used GC identification or quantification of the constitutive components presenting in the wash oil, were purchased from Sigma Aldrich, Seoul, Korea. Methanol (≥99.5% purity) and n-hexane (≥99% purity), used as the solvent of each operation in this study, were also purchased from Sigma-Aldrich, Seoul, Korea. In this study, the above-mentioned eight kinds of commercial reagents were used without further purification.

Dichloromethane and anhydrous sodium sulfate were purchased from VWR (Darmstadt, Germany). All chemicals were at least of analytical grade. To improve its purity, DCM was freshly distilled prior to use. Acetic acid, benzaldehyde, sec-butylbenzene, 1-butanol, (E)-2-butenal, butyl acrylate, decanal, ethenylbenzene (styrene), 2-ethylhexyl acrylate, methyl octanoate, 1-methylnaphthalene, 2-methylnaphthalene, naphthalene, octanal and propylbenzene were obtained from Sigma-Aldrich (Steinheim, Germany). Butyl acetate, ethylbenzene, (propan-2-yl)benzene (cumene) and 3-phenyl-1-propene (allylbenzene), were purchased from TCI Europe (Zwijndrecht, Belgium). 1,2-Dimethylnaphthalene, 1,7-dimethylnaphthalene and 3-methyl-4-heptanone were obtained from abcr (Karlsruhe, Germany), and 2-acetyl-1-pyrroline from aromaLAB (Planegg, Germany).