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PROCESS FOR PREPARING METHACRYLIC ACID OR METHACRYLIC ESTERS

  • US 20100291644A1
  • Filed: 05/30/2008
  • Published: 11/18/2010
  • Est. Priority Date: 06/02/2006
  • Status: Active Grant
First Claim
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1. A process for preparing a methacrylic acid or a methacrylic ester, comprisingIA) preparing a 3-hydroxyisobutyric acid by a process comprising bringing a cell which is genetically modified in comparison with a wild type of the cell, wherein the cell is capable of forming more 3-hydroxyisobutyric acid, or polyhydroxyalkanoate comprising 3 hydroxyisobutyric acid, into contact with a nutrient medium comprising, as carbon source, carbohydrate, glycerol, carbon dioxide, methane, methanol, L-valine or L-glutamate under a condition wherein a 3-hydroxyisobutyric acid or polyhydroxyalkanoate comprising 3-hydroxyisobutyric acid is obtained from the carbon source, optionally isolating the 3-hydroxyisobutyric acid from the nutrient medium and optionally neutralizing the 3-hydroxyisobutyric acid, andIB) dehydrating the 3-hydroxyisobutyric acid, forming a methacrylic acid and optionally esterifying the methacrylic acid.

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