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Preparation of polyoxymethylene dimethyl ethers by acid-activated catalytic conversion of methanol with formaldehyde formed by dehydrogenation of methanol

  • US 20020007089A1
  • Filed: 07/11/2001
  • Published: 01/17/2002
  • Est. Priority Date: 11/12/1998
  • Status: Active Grant
First Claim
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1. A process for the catalytic production of a mixture of oxygenated organic compounds suitable as a blending component of fuel for use in compression ignition internal combustion engines, which process comprises providing a feedstream comprising methanol, a soluble condensation promoting component capable of activating a heterogeneous acidic catalyst, and a source of formaldehyde formed by the conversion of methanol in the presence of a catalyst comprising copper and zinc as catalyst components which source of formaldehyde comprises from about 30 to about 85 percent by weight formaldehyde in methanol solution containing less than about 5 percent water;

  • heating the feedstream with the heterogeneous acidic catalyst under conditions of reaction sufficient to form an effluent of condensation comprising water, methanol, methylal and one or more polyoxymethylene dimethyl ethers which methylal and polyoxymethylene dimethyl ethers have structures represented by the formulaCH3O(CH2O)nCH3where n is a number from 1 to about 10; and

    contacting at least a liquid portion of the effluent with an anion exchange resin to form an essentially acid-free mixture comprising methylal and polyoxymethylene dimethyl ethers having values of n greater than 1.

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