Process for the purification of crude .beta.-phenylethyl alcohol
AssigneeHaarman & Reimer GmbH
InventorsJurgen Nienhaus, Rudolf Hopp
Life of this patent
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Abstract
Process for the purification of crude .beta.-phenylethyl alcohol by azeotropic distillation in the presence of alkanolamines in which the alkylene chain contains 2 to 4 carbon atoms and is optionally substituted by 1 to 4 C.sub.1 -C.sub.3 -alkyl groups.
Claims9
In a process for the purification of crude .beta.-phenyethyl alcohol containing impurities by azeotropic distillation in a column in the presence of a solvent, the improvement which comprises using as the solvent an alkanolamine in which the alkylene chain has 2 to 4 carbon atoms and is unsubstituted or substituted by 1 to 4 C.sub.1 -C.sub.3 -alkyl groups, said alkanolamine forming an azeotrope with the impurities, taking off said azeotrope at the top of the column and taking off the purified .beta.-phenylethyl alcohol at the bottom of the column for distillation that is carried out continuously, and taking off at the top of the column first said azeotrope and subsequently the purified .beta.-phenylethyl alcohol for distillation that is carried out discontinuously.
Dependencies are inferred from the claim text.