Phenol

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cjy19870722
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Joined: Wed Aug 31, 2011 4:13 pm

Phenol

Post by cjy19870722 »

The steam of Phenol(CAS NO. 108-95-2) was passed through a boiling soln containing lmole of phenol and 1.5-2.0moles of NaOH in 5L of H2O until all non-acidic material had distd. The residue was cooled, acidified with 20% (vh) H2SO4, and the phenol was separated, dried with Cas04 and fractionally distd under reduced pressure. It was then fractionally crystd several times from its melt. Purification via the benzoate has been used by Berliner, Berliner and Nelidow. The benzoate was crystd from 95% EtOH, then hydrolysed to the free phenol by refluxing with two equivalents of KOH in aq EtOH until the soln became homogeneous. It was acidified with HCl and extracted with diethyl ether. The ether layer was freed from benzoic acid by thorough extraction with aqueous NaHCO3, and, after drying and removing the ether, the phenol was distd
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