Distillation: processes – separatory – With disparate physical separation – Utilizing removing solid from liquid
Patent
1985-05-28
1986-08-26
Bascomb, Wilbur
Distillation: processes, separatory
With disparate physical separation
Utilizing removing solid from liquid
203 71, 203DIG11, 62542, 549460, C07D30791, B01D 300, B01D 900
Patent
active
046081275
ABSTRACT:
Separation and recovery of dibenzofuran of high purity is accomplished by distilling a coal tar fraction having boiling point range of 220.degree. to 300.degree. C. thereby producing a dibenzofuran fraction having a dibenzofuran content of not less than 30% by weight, a dibenzofuran/acenaphthene molar ratio of not less than 1.3, and a fluorene/dibenzofuran molar ratio of not more than 0.05, then introducing the dibenzofuran fraction obtained as described above into a continuous crystallization purification unit provided with a cooling zone for crystallization of the feed, a heating zone for melting the purified crystals, and a refining zone for enabling crystals being transferred from said cooling zone to said heating zone to come into counter current contact with a mass of molten crystals midway along the path between said two zones, and subjecting the dibenzofuran fraction to continuous crystallization purification therein.
REFERENCES:
patent: 2931841 (1960-04-01), De Vault
patent: 2953504 (1960-09-01), Bole et al.
patent: 3031463 (1962-04-01), Overholt et al.
patent: 3067270 (1962-12-01), Weedman
patent: 4279130 (1981-07-01), Finch et al.
Ohta Kihachiro
Sakuma Kiyoshi
Tabuchi Sunao
Takeuchi Masakazu
Tomioka Tadao
Bascomb Wilbur
Hueschen Gordon W.
O'Brien Kevin M.
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