FIELD: chemistry.
SUBSTANCE: invention relates to an improved method of producing pure methacrylic acid, which involves: a) gas-phase oxidation of a C4 compound to obtain a methacrylic acid-containing gas phase, b) condensing the methacrylic acid-containing gas phase to obtain an aqueous methacrylic acid solution, c) separating at least a portion of the methacrylic acid from the aqueous methacrylic acid solution to obtain at least one methacrylic acid-containing raw product, d) separating at least a portion of methacrylic acid from the at least one methacrylic acid-containing raw product by thermal separation to obtain pure methacrylic acid, wherein at step (d), methacrylic acid is separated from at least a portion of at least one methacrylic acid-containing raw product by fractionation, and wherein the pure methacrylic acid is collected through a side outlet used for the fractionation column, and the amount of pure methacrylic acid collected over a certain time interval ranges from 40% to 80% of the amount of the methacrylic acid-containing raw product fed into the fractionation column over the same time interval. The invention also relates to an apparatus for producing methacrylic acid using said method, the apparatus comprising: a1) a gas-phase oxidation unit, b1) an absorption unit, c1) a separation unit, and d1) a purification unit, wherein the purification unit has at least one distillation column, wherein the at least one distillation column has at least one side outlet for pure methacrylic acid. The invention also relates to a method of producing methacrylic esters, polymethacrylate, polymethacrylic esters, which includes a step for said production of pure methacrylic acid.
EFFECT: obtaining an end product with fewer by-products while simplifying the process.
32 cl, 3 tbl, 4 dwg, 6 ex
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