Process for producing methacrylic acid from isobutylene by two s

Details Process for producing methacrylic acid from isobutylene by two s Process for producing methacrylic acid from isobutylene by two s

1977-03-08

1978-11-07

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

260604R, 562535, C07C 4504, C07C 5132

Patent

active

041246349

ABSTRACT:
In a process for producing methacrylic acid by two step oxidation comprising a first oxidation step of producing methacrolein by reacting isobutylene with molecular oxygen in the presence of a diluent gas and a catalyst, and a second oxidation step of producing methacrylic acid by reacting methacrolein with molecular oxygen in the presence of a diluent gas and a catalyst, the improvement comprises using nitrogen as the diluent gas in the first oxidation step and nitrogen and steam as the diluent gas in the second oxidation step, mixing the reaction products obtained in the first and second oxidation steps, separating and recovering methacrolein and methacrylic acid from the mixture and feeding the recovered methacrolein back into the second oxidation step as a starting material.

REFERENCES:
patent: 3725472 (1973-03-01), Kowano et al.
patent: 3882047 (1975-05-01), Nuna et al.

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