The invention provides a method for producing (methyl)
acrylic acid. The method comprises: selecting at least one of C3 compounds such as
propane, propylene, isopropanol, glycerin and
acrolein, or at least one of C4 compounds such as isobutene, isobutene,
tertiary butyl
alcohol and acrylaldehyde as raw materials to carry out
catalytic oxidation to prepare a gas mixture containing the (methyl)
acrylic acid; absorbing the gas mixture, and separating the (methyl)
acrylic acid water solution, wherein a rectifying section of a rectifying
tower separating the (methyl)acrylic
acid water solution adopts regular packing or parallel-current jet packing trays, or the upper part of the rectifying section adopts the regular packing and the lower part of the rectifying section adopts the parallel-current jet packing trays; and a stripping section adopts directed floating valve trays or vertical
sieve trays, or the upper part of the stripping section adopts the directed floating valve trays and the lower part of the stripping section adopts the vertical
sieve trays. The rectifying
tower with combined
tower internal structure embodies a concentrated reflection of the advantages of the regular packing, the parallel-current jet packing trays, the directed floating valve trays and / or vertical
sieve trays in the same rectifying
system, thereby effectively improving separating capability of the rectifying tower, lowering full-tower pressure drop and operational temperature, avoiding convergescence of the (methyl)acrylic acid at a high temperature, making the
water content of tower-bottom discharged material reduced below 0.5 percent, the
acetic acid content of the tower-bottom discharged material reduced below 2 percent and the (methyl)acrylic
acid content of tower-top water phase reduced below 0.5 percent, further reducing unit consumption of the (methyl)acrylic acid products and improving product quality.