Separation of acetone from methanol by extractive distillation
OwnerLloyd Berg, Karl J. Warreninventors
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Abstract
Acetone cannot be completely removed from acetone-methanol mixtures by distillation because of the presence of the minimum boiling azeotrope. Acetone can be readily separated from methanol by using extractive distillation in which the extractive agent is a higher boiling oxygenated, nitrogenous and/or sulfur-containing organic compound or a mixture of two or more of these. Typical examples of effective agents are: Glycerine, 1,5-Pentanediol, Dimethylsulfoxide, n-Hexanol, Dioctyl phthalate and N,N-Dimethylacetamide.
Claims2
A method for recovering acetone from a mixture of acetone and methanol which comprises distilling a mixture of acetone and methanol in a rectification column in the presence of about one to two parts of extractive agent per part of acetone-methanol mixture, recovering essentially pure acetone as overhead product and obtaining the extractive agent and methanol from the stillpot or reboiler, the extractive agent comprises at least dimethylsulfoxide.
Dependencies are inferred from the claim text.