Methacrylic Acid → Methacrylic Acid

Participants

Reaction Steps

A continuous distillation operation was carried out in a way similar to the example 3.1 except that acrylic acid was changed to methacrylic acid. But an aqueous methacrylic acid solution obtained from a catalytic gas phase oxidation reaction of isobutylene, which contains 37% by weight of methacrylic acid, 9.07% by weight of acetic acid, and 50% by weight of water, was subjected to an extracting operation by n-heptane with an extraction ratio of 1.3. The thus-obtained n-heptane phase containing 76.4% by weight of n-heptane, 21.8% by weight of methacrylic acid, and 1.3% by weight of acetic acid was used as a supplying material. Distillation was carried out under the conditions of temperature at the column top 42° C., temperature at the column bottom 122° C., pressure at the column top 105 mmHg, and refluxing ratio=1.0 (weight standard).

Provenance & Evidence