Process for producing (meth)acrylic acid or (meth)acrolein

Process for producing (meth)acrylic acid or (meth)acrolein

  • CN 100,335,455 C
  • Filed: 10/27/2004
  • Issued: 09/05/2007
  • Est. Priority Date: 12/15/2003
  • Status: Active Grant
First Claim
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1. method for preparing (methyl) vinylformic acid or (methyl) propenal, this method is by means of multitubular reactor, utilize the gas of molecular oxygen or molecule-containing keto, by at least a propylene that is selected from, propane, the gas phase catalytic oxidation reaction of the material of wanting oxidation in iso-butylene and (methyl) propenal, prepare (methyl) vinylformic acid or (methyl) propenal, described multitubular reactor has such structure, in this structure, comprise a plurality of reaction tubess, described reaction tubes axially is equipped with one or more layers catalyzer along it, and be used for conditioned reaction temperature and can be at the heating medium of these reaction tubes flows outside, the method of this preparation (methyl) vinylformic acid or (methyl) propenal is characterised in that, the variation of temperature of described gas phase catalytic oxidation reaction of raising is performed such:

  • the temperature in that changes the heating medium that is used for the conditioned reaction temperature, simultaneously, (1) is not higher than 2 ℃

    speed with each change operation, change the temperature in of heating medium, reach (2) when change operation is carried out continuously, the timed interval between the double change operation is not shorter than 1 hour.

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