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Production of High-Purity Allyl Alcohol by the Salting-Out Method from Formic Acid-Mediated Deoxydehydration of Glycerol
journal contribution
posted on 2018-09-25, 11:40 authored by Ruilong Jia, Binbin Zhao, Wenjie Xue, Lei Liu, Jinxiang DongFormic acid-mediated deoxydehydration
of glycerol has emerged as
an attractive approach to produce allyl alcohol; however, separation
of allyl alcohol by distillation is not a straightforward task from
the mixture of allyl alcohol, formic acid, and water because of their
very close boiling point. A new route to separate allyl alcohol with
high purity has been developed by the precipitation, distillation,
and salting-out process. Among 11 salts, NaCl, K2HPO4, and K2CO3 could easily induce the
liquid–liquid phase splitting. K2CO3 exhibits
the best salting-out effect in a single salt system. Meanwhile, the
solubility of allyl alcohol in the organic phase could be predicted
by the mass fraction of salt. The allyl alcohol purity of >99.9%
could
be achieved by using 35% K2CO3 + 25% K2HPO4. The results also provide valuable references to
obtain high-purity allyl alcohol for all the glycerol to allyl alcohol
routes, because it is indispensable to separate allyl alcohol from
its aqueous solution.