| 摘要 |
1,209,498. Drying methacrylic acid. ESCAMBIA CHEMICAL CORP. 10 April, 1968 [17 May, 1967], No. 17397/68. Heading C2C. Methacrylic acid is dried by extracting an aqueous solution of methacrylic acid with an organic solvent which is no more than slightly soluble in water and in which methacrylic acid is more soluble than it is in water and which forms a minimum boiling azeotrope with water and has a b.pt. lower than the boiling point of methacrylic acid. The organic solvent extract is distilled to remove the organic solvent and water as distillate and the substantially dry pure methacrylic acid is recovered as a bottoms.
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