Method for producing acrylic acid

Abstract

The objective of the present invention is to provide method for acrylic acid in which a generation of polymerized substance is prevented while acrylic acid is stored in a storage tank. A method of the present invention for producing acrylic acid, comprising storing acrylic acid in a storage tank, wherein a process liquid containing 50 mass % or more of acrylic acid is subjected to at least one filtering operation at 15 to 70° C. when the process liquid is supplied to the storage tank.

Description

Claims

1. A method for producing acrylic acid, comprising: storing acrylic acid in a storage tank, wherein a process liquid containing 50 mass % or more of acrylic acid is subjected to at least one filtering operation at 15 to 70° C. when the process liquid is supplied to the storage tank.

2. The method of producing acrylic acid of claim 1, comprising the steps of: (a) obtaining a acrylic acid-containing gas by a vapor-phase catalytic oxidation reaction from an acrylic acid raw material;(b) obtaining a crude acrylic acid by at least of absorbing or condensing the acrylic acid-containing gas; and(c) purifying acrylic acid from the crude acrylic acid by at least one of distillation or crystallization.

3. The method of producing acrylic acid of claim 1, wherein the process liquid containing 50 mass % or more of the acrylic acid comprises at least one of a column bottom flow of a absorption column or a purified acrylic acid.

4. The method of producing acrylic acid of claim 2, wherein the process liquid containing 50 mass % or more of the acrylic acid comprises at least one of a column bottom flow of a absorption column or a purified acrylic acid.

5. The method of producing acrylic acid of claim 1, wherein the process liquid containing 50 mass % or more of the acrylic acid comprises a purified acrylic acid.

6. The method of producing acrylic acid of claim 2, wherein the process liquid containing 50 mass % or more of the acrylic acid comprises a purified acrylic acid.