From vinylformic acid C 3the oxalic dialdehyde being separated the vinylformic acid contained as main composition in the gaseous product mixture of precursor compound and contain as by product method

From vinylformic acid C 3the oxalic dialdehyde being separated the vinylformic acid contained as main composition in the gaseous product mixture of precursor compound and contain as by product method

  • CN 102,112,429 B
  • Filed: 07/14/2009
  • Issued: 09/16/2015
  • Est. Priority Date: 07/28/2008
  • Status: Active Grant
First Claim
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1. one kind is separated in vinylformic acid C 3in the product gas mixture of the part heterogeneous catalysis gaseous oxidation of precursor compound, as principal product exist vinylformic acid and as by product exist oxalic dialdehyde method, wherein obtain a kind of liquid phase P, described liquid phase P comprises the vinylformic acid accounting for its weight at least 70%, and with the acrylic acid molar amount wherein existed, comprise the oxalic dialdehyde of at least 500 molar ppm;

  • The method is comprised and being separated with vinylformic acid by the oxalic dialdehyde in liquid phase P by crystallization, vinylformic acid enrichment in the crystal formed, enrichment in the mother liquor that oxalic dialdehyde is residual in crystallisation process.

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