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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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Glycerol [56-81-5] C3H8O3, M 92.1, m 18.2°, b 182°/20mm, 290°/760mm, d420 1.261, nD25 1.47352, pK25 14.4. Glycerol is dissolved in an equal volume of n-butanol (or n-propanol, amyl alcohol or liquid ammonia) in a water-tight container, cooled and seeded while slowly revolving in an ice-water slurry. The crystals are collected by centrifugation, then washed with cold acetone or isopropyl ether. [Hass & Patterson Ind Eng Chem (Anal Ed) 33 615 1941, DOI: 10.1021/ie50377a015.] Coloured impurities can be removed from substantially dry glycerol by extraction with 2,2,4-trimethylpentane. Alternatively, glycerol can be decolorised and dried by treatment with activated charcoal and alumina, followed by filtering. Glycerol can be distilled at 15mm in ...

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