Methacrylic acid decoloration and purification method

Methacrylic acid decoloration and purification method

  • CN 103,819,331 A
  • Filed: 02/28/2014
  • Published: 05/28/2014
  • Est. Priority Date: 02/28/2014
  • Status: Active Grant
First Claim
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1. the decolouring of a methacrylic acid and method of purification, take the thick product of methacrylic acid as raw material, this thick product is produced the mixed gas of methacrylic acid by the trimethyl carbinol or iso-butylene catalytic gas phase oxidation, make through absorption, extraction and rectifying, it is characterized in that:

  • in thick product, add the aromatic amine discoloring agent having containing methoxy or ethoxy replacement, carry out rectification and purification, rectifying tower tower top can obtain the methacrylic acid product that colourity is less than 10 again.

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