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Method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage

  • US 6,008,409 A
  • Filed: 12/29/1997
  • Issued: 12/28/1999
  • Est. Priority Date: 12/27/1996
  • Status: Expired due to Term
First Claim
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1. A method for obtaining 2-hydroxy-4-methylthiobutyric acid (MHA) which is stable in storage, comprising:

  • distilling a highly-concentrated liquid MHA containing >

    95% by weight monomeric and oligomeric components of MHA for an average residence time of the MHA between 1 and 1×

    104 s, under reduced pressure of between 1×

    10-3 and 5×

    104 Pa, at a temperature in a range between 40° and

    200°

    C., at which the monomeric MHA is converted into a gaseous state for a time period which is sufficiently short that formation of significant by-product components is avoided.

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