Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1978-04-06
1979-04-03
Bascomb, Jr., Wilbur L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
203 42, 203 62, 203 63, 203 74, 203 91, 203 87, 203DIG21, 260603C, 562536, B01D 336, C07C 5704, C07C 5142
Patent
active
041477219
ABSTRACT:
In an oxidation process for converting methacrolein to methacrylic acid, methacrylic acid is recovered by cooling and condensing the effluent from the oxidation, followed by azeotropic distillation of the condensate with a suitable solvent, such as methyl n-propyl ketone. The condensed effluent contains methacrylic acid and water as the major components along with by-product acetic acid, a minor amount of unreacted methacrolein and impurities. Substantially dry crude methacrylic acid is separated as a bottom product from the azeotropic distillation and an azeotrope of water and the solvent is taken overhead and condensed. After condensation, solvent-rich and water-rich phases form and are separated. The solvent-rich phase is returned to the distillation column as a reflux, while the water-rich phase is sent to a stripping column for recovery of residual solvent. Water is withdrawn from the bottom of the stripping column and recycled or discarded, as desired. Optionally, an additional distillation column may be used in order to remove unreacted methacrolein from the solvent used in the azeotropic distillation.
REFERENCES:
patent: 2811545 (1957-10-01), Steadman
patent: 2922815 (1960-01-01), Faerber
patent: 3414485 (1968-12-01), Speed
patent: 3926744 (1975-12-01), Noll et al.
patent: 3932500 (1976-01-01), Duembgen et al.
patent: 4001316 (1977-01-01), Ishimi
patent: 4012449 (1977-03-01), Shakakura et al.
Bascomb, Jr. Wilbur L.
Dick David
Halcon Research and Development Corporation
Long William C.
Wells Harold N.
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