| 摘要 |
PURPOSE:To efficiently, economically obtain low-sulfur naphthalene with high purity by heating a crude naphthalene containing benzothiophene as an impurity in the presence of a solid acid catalyst followed by distillation. CONSTITUTION:Firstly, a crude naphthalene containing benzothiophene as an impurity is treated under heating pref. at 90-110 deg.C in the presence of a solid acid catalyst (pref. Y-type zeolite). Thence, normally, after removing the catalyst from the treatment liquor, the liquor is put to distillation to obtain the objective compound. It is recommended that the amount of the catalyst to be used be 3-10wt.% based on the crude naphthalene in the case that the total basic nitrogen and total sulfur contents of the crude naphthalene are 5-10ppm and 500-2000ppm, respectively, or 10-30wt.% based on the crude naphthalene in the case that the total basic nitrogen and total sulfur contents are 100-300ppm and 4000-5000ppm, respectively. |
