| abstract |
Highly methacrylic acid (“HPMAA”) of substantially pure, especially 99% pure water, containing less than 0.05% water and low levels of other impurities including HIBA, acrylic acid, MOMPA, methacrolein, etc. Provided is a method for producing a high yield. The improved process includes providing a crude MAA stream and purifying the crude methacrylic acid in a series of distillation steps comprising two distillation columns. The process can produce high purity methacrylic acid products that are particularly suitable for preparing specialty MAA polymers. |