There is provided a process for producing (meth)acrylic acid including an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an absorption tower and allowing the gas to contact with an absorbent, in which absorption step a crude (meth)acrylic acid solution is withdrawn from a withdrawal outlet positioned between a supply point for the (meth)acrylic acid-containing gas and a supply point for the absorbent on the absorption tower, and then supplied to a next step. The process for producing (meth)acrylic acid makes it possible to suppress the formation of Michael adducts, thereby obtaining a (meth)acrylic acid containing solution in high yield and in high concentration.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a process drawing showing a preferred embodiment of the present invention.
FIG. 2 is a process drawing showing another preferred embodiment of the present invention.
Claims
1. A process for producing (meth)acrylic acid comprising an absorption step of bringing a (meth)acrylic acid-containing gas obtained by a gas phase catalytic oxidation method into an absorption tower and allowing the gas to contact with an absorbent, thereby absorbing the (meth)acrylic acid as a crude (meth)acrylic acid solution, in which absorption step the crude (meth)acrylic acid solution is withdrawn from a withdrawal outlet positioned between a supply point for the (meth)acrylic acid-containing gas and a supply point for the absorbent on the absorption tower, and then supplied to a next step.
2. The process for producing (meth)acrylic acid according to claim 1, wherein a (meth)acrylic acid concentration in the crude (meth)acrylic acid solution withdrawn from the absorption tower is 80% by mass or higher.
3. The process for producing (meth)acrylic acid according to claim 1, wherein the next step is a step of separation and purification of (meth)acrylic acid from the crude (meth)acrylic acid solution.
4. The process for producing (meth)acrylic acid according to claim 3, wherein the step of separation and purification comprises a crystallization step and/or a distillation step.
5. The process for producing (meth)acrylic acid according to claim 1, wherein the absorbent comprises water.
Patent Application
20070173667
