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HYDROCARBOXYLATION OF AQUEOUS FORMALDEHYDE USING A DEHYDRATING RECYCLE STREAM TO DECREASE WATER CONCENTRATION

  • US 20130331605A1
  • Filed: 06/08/2012
  • Published: 12/12/2013
  • Est. Priority Date: 06/08/2012
  • Status: Active Grant
First Claim
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1. A process for the preparation of glycolic acid, comprising(A) feeding carbon monoxide, aqueous formaldehyde, and a recycle dehydration stream to a hydrocarboxylation reaction zone to produce an effluent comprising glycolic acid, glycolic acid oligomers, and water;

  • (B) dehydrating said effluent to produce a first dehydration stream having a higher degree of polymerization (Dp) than said effluent and a water stream; and

    (C) splitting said first dehydration stream into said recycle dehydration stream of step (A) and an intermediate stream.

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