C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/520.7
C07C 51/235 (2006.01) C07C 51/25 (2006.01) C07C 57/05 (2006.01)
Patent
CA 1309418
Abstract of the Disclosure: Methacrylic acid can be pre- pared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250 to 400°C with cooling of the hot reaction gas to below 100°C, absorption of the methacrylic acid in a water- operated absorption column, at below 100°C and partial re- cycling into the oxidation reactor after admixture of meth- acrolein or isobutyraldehyde and oxygen by feeding a quan- tity of methacrolein or isobutyraldehyde equal to the quan- tity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorption column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas. a side stream which is washed in a wash column operated with water at < 10°C to remove unconverted methacrolein or isobutyraldehyde which is fed as an aqueous solution to the top of the absorption column.
570525
Duembgen Gerd
Jaeger Michael
Krabetz Richard
Merger Franz
Thiessen Fritz
Basf Aktiengesellschaft
Borden Ladner Gervais Llp
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