Process for preparing ethers

Details Process for preparing ethers Process for preparing ethers

C - Chemistry, Metallurgy

07

C

260/648

C07C 41/06 (2006.01) C07C 29/76 (2006.01) C07C 41/36 (2006.01) C07C 43/04 (2006.01)

Patent

CA 1281743

IMPROVED PROCESS FOR PREPARING METHYL TERT.-BUTYL ETHER ABSTRACT OF THE INVENTION In the process for preparing methyl tert.-alkyl ether comprising the steps of (a) contacting and reacting in the liquid phase a reaction mixture formed by combining a stream consisting essentially of C4-C5 hydrocarbons and containing at least some proportion of isoalkylene and a stoichiometric excess of methanol, with respect to the isoalkylene, to form a reaction product comprising methyl tert.-alkyl ether, unreacted methanol and unreacted C4-C5 hydro- carbons; (b) isolating the methyl tert.-alkyl ether from the reaction product; and (c) recovering the unreacted methanol from the residual portion of the reaction product; the improvement which comprises selectively adsorbing the methanol constituent of said residual reaction product in a bed of crystalline molecular sieve adsorbent and recovering same by desorption using as a purge-desorption stream, the C4-C5 hydrocarbon stream used to prepare the initial reaction mixture.

496901

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