| Autor: |
Yafei QIAO, Junli LIU, Cuiping YE, Meixin GUO, Wenying LI |
| Jazyk: |
English<br />Chinese |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Taiyuan Ligong Daxue xuebao, Vol 54, Iss 2, Pp 241-246 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1007-9432 |
| DOI: |
10.16355/j.cnki.issn1007-9432tyut.2023.02.003 |
| Popis: |
It is difficult to separate fluorene and phenanthene by conventional separation method owing to their similar properties. The reaction-separation coupling technique was adopted to solve the problem, in which fluorene is first converted into 9-fluorenylmethanol. The factors affecting the yield and selectivity of 9-fluorenylmethanol by one-step synthesis with potassium carbonate as catalyst were investigated for the separation of phenanthrene from anthracene residue further. The results showed that with DMSO+10% ethanol as solvent, n(fluorene)∶n(formaldehyde)∶n(potassium carbonate)=1∶1∶0.2, and reaction at 13 ℃ for 15 min, the yield of 9-fluorenemethanol is about 25% and the selectivity is higher than 84%. Ethanol can inhibit the formation of 9-fluorenyl anion, and the inorganic salt affects the mass transfer and slows down the dehydration reaction. Using the mixture of fluorene and phenanthrene with mass ratio of 1∶4 as raw material, the yield and purity of phenanthrene reaches 97.6% and 93.2% after five reaction-separation cycles, respectively; the total yield of 9-fluorenylmethanol is 66.5%, and the average purity is 95.0%. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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