Snamprogetti S.p.a.

Flavio Cianci

Carlo Rescalli

Adriano Scazzosi

Riziero Ricci

From a mixture containing methanol, ethanol, n-propanol, isobutanol water and other high-boiling and low-boiling compounds, the claimed process enables three separate streams to be obtained, one an anhydrous stream of methanol or methanol and ethanol (I), one containing most of the n-propanol present in the feed mixture (II), and one containing most of the isobutanol present in the feed mixture (III), by using three fractionating columns.

Process for separating alcohols from mixtures of alcohols, water and

A process is disclosed for the dehydration of a mixture of methanol and higher alcohols, containing 20 to 80% by weight of methanol, 1 to 60% by weight of at least a higher alcohol selected from those containing from 2 to 10 carbon atoms, 1 to 50% by weight of water and 0.1 to 10% by weight of hydrocarbons and/or of oxygen-containing organic compounds different from alcohols, which process comprises the following steps: p0 (a) feeding to a first rectification tower the mixture of methanol and higher alcohols to be dehydrated, a gaseous stream being discharged from the tower head, which contains a portion of the hydrocarbons and/or of the oxygen-containing organic compounds different from the alcohols; from a side point at a level higher than 2/3 of the tower height, a stream containing methanol and possibly ethanol being drawn; and from the tower bottom a stream being obtained with a methanol, and possibly ethanol, and having a content not larger than 10% by weight;

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San Donato Milanese, Italy

Flavio Cianci