发明名称 |
Dibenzofuran distillation and crystallization process |
摘要 |
Separation and recovery of dibenzofuran of high purity is accomplished by distilling a coal tar fraction having boiling point range of 220 DEG to 300 DEG 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.
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申请公布号 |
US4608127(A) |
申请公布日期 |
1986.08.26 |
申请号 |
US19850741268 |
申请日期 |
1985.05.28 |
申请人 |
SAKUMA, KIYOSHI;TOMIOKA, TADAO;TABUCHI, SUNAO;OHTA, KIHACHIRO;TAKEUCHI, MASAKAZU |
发明人 |
SAKUMA, KIYOSHI;TOMIOKA, TADAO;TABUCHI, SUNAO;OHTA, KIHACHIRO;TAKEUCHI, MASAKAZU |
分类号 |
C07D307/91;(IPC1-7):C07D307/91;B01D3/00;B01D9/00 |
主分类号 |
C07D307/91 |
代理机构 |
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地址 |
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