Separation of methyl acetate from methanol by extractive distillation
OwnerLloyd Berg, An-I Yehinventors
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Abstract
Methyl acetate cannot be completely removed from methyl acetate-methanol mixtures by distillation because of the presence of the minimum binary azeotrope. Methyl acetate can be readily removed from mixtures containing it and methanol by using extractive distillation in which the extractive distillation agent is a higher boiling oxygenated, nitrogenous and/or sulfur containing organic compound or a mixture of these. Typical examples of effective agents are dimethylsulfoxide; glycerine plus propylene glycol; ethylene glycol plus DMSO plus 1,5-pentanediol. Methanol can be removed as the overhead product from methyl acetate when the extractive distillation agent is nitrobenzene, propylene carbonate or ethylene glycol phenyl ether.
Claims3
A method for recovering methyl acetate from a mixture of methyl acetate and methanol which comprises distilling a mixture of methyl acetate and methanol in a rectification column in the presence of an effective amount of an extractive agent, recovering essentially pure methyl acetate as overhead product and obtaining the extractive agent and methanol from the stillpot or reboiler, the extractive agent comprises at least glycerine.
A method for recovering methyl acetate from a mixture of methyl acetate and methanol which comprises distilling a mixture of methyl acetate and methanol in a rectification column in the presence of an effective amount of an extractive agent, recovering essentially pure methyl acetate as overhead product and obtaining the extractive agent and methanol from the stillpot or reboiler, the extractive agent comprises a mixture of tetraethylene glycol and 1,5-pentanediol.
Dependencies are inferred from the claim text.