Method for refining polyoxymethylene dialkyl ethers by catalytic hydrogenation using a fixed bed
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United States of America Patent
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Jun 9, 2015
Grant Date -
Dec 11, 2014
app pub date -
Apr 21, 2014
filing date -
Jun 9, 2013
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Abstract
The present invention relates to a method for refining polyoxymethylene dialkyl ethers by catalytic hydrogenation using a fixed bed, wherein, using a fixed bed reactor for refining by hydrogenation, an equilibrium system containing polyoxymethylene dialkyl ethers products is refined by catalytic hydrogenation, so as to remove formaldehyde contained therein. The refining method by hydrogenation described in the present invention can remarkably increase the separation and purification efficiency of polyoxymethylene dialkyl ether products with various polymerization degree, and the polyoxymethylene dialkyl ethers obtained after subsequent rectification have a purity greater than 99.5%, a product yield greater than 97% and an atom utilization ratio close to 100%.
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