| 摘要 |
PROBLEM TO BE SOLVED: To provide an easily operational purification method of methacrylic acid which is produced in liquid phase reaction from methacrolein and methanol using a compound containing palladium, and contains coloring factors and/or polymerization inhibitors, capable of obtaining a high quality methacrylic acid low in color development excellent in polymerizability in high yield. SOLUTION: The methacrylic acid produced in liquid phase reaction from methacrolein and methanol using a compound including palladium is brought into contact with a compound containing a primary and/or secondary amine group and a compound containing a mercapto group, or the compound containing a primary and/or secondary amino group, a compound containing a mercapto group and a compound containing a sulfo group.
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