Removal and recovery of quinoline bases from methylnaphthalene oil in a semicontinuous supercritical CO{sub 2} separation apparatus with a fixed bed of supported aluminum sulfate
- Kyushu Univ., Kasuga, Fukuoka (Japan). Inst. of Advanced Material Study
Crude methylnaphthalene oil (CMNO) is produced as a distillation residue of naphthalene oil of coal tar after the recovery of crude naphthalene. CMNO contains quinolines and isoquinolines as the contaminants in methylnaphthalenes. Capture and recovery of quinoline bases from methylnaphthalene oil were examined using a semicontinuous supercritical CO{sub 2} extraction apparatus equipped with the fixed bed of supported aluminum sulfate as a solid acid adsorbent. A model methylnaphthalene oil (quinoline and isoquinoline in 1- and 2-methylnaphthalenes) mixed with supercritical CO{sub 2} (323 K, 80 atm) was continuously fed over the fixed bed of the adsorbent. The nitrogen compounds were selectively adsorbed on the solid acid, giving purified methylnaphthalenes by the feeding of 120 min. Quinoline and isoquinoline started to elute by 140 and 180 min, respectively, with the composition at the outlet gradually approaching to the initial one by 220 min. After the feeding was stopped and then the adsorbent was washed with supercritical CO{sub 2} at 353 K for 25 min, the adsorbed nitrogen compounds were effectively recovered by mixing a small amount of tetrahydrodurfan (THF) as an entrainer to the supercritical CO{sub 2} to regenerate the adsorbent at the same time. The adsorbent was confirmed to be repeatedly used by the above adsorption/desorption cycle, with purified methylnaphthalenes and concentrated quinoline bases being alternatively recovered at the adsorption/desorption steps, respectively.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 183134
- Journal Information:
- Industrial and Engineering Chemistry Research, Journal Name: Industrial and Engineering Chemistry Research Journal Issue: 11 Vol. 34; ISSN IECRED; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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