Method for producing (meth)acrylic acid derivative

Abstract

The present invention provides a method for efficiently using an aqueous solution of (meth)acrylic acid at a low concentration formed in a production/storage step of (meth)acrylic acid. In the present invention, a (meth)acrylic acid derivative is produced by using as a raw material an aqueous solution of (meth)acrylic acid formed by one or both of: a device which reduces a pressure of a gas comprising (meth)acrylic acid in production of (meth)acrylic acid; and a device which collects (meth)acrylic acid from a gas comprising (meth)acrylic acid.

1 . A method for producing a (meth)acrylic acid derivative, comprising using as a raw material an aqueous solution of (meth)acrylic acid formed by one or both of: a device which reduces a pressure of a gas comprising (meth)acrylic acid in production of (meth)acrylic acid; and a device which collects (meth)acrylic acid from a gas comprising (meth)acrylic acid.  
     
     
         2 . The method for producing a (meth)acrylic acid derivative according to  claim 1 , wherein the aqueous solution of (meth)acrylic acid has a (meth)acrylic acid content of less than 20 mass %.  
     
     
         3 . The method for producing a (meth)acrylic acid derivative according to  claim 1 , wherein the aqueous solution of (meth)acrylic acid comprises at least one selected from the following things: 
 ( 1 ) a condensed water of a vapor used for a steam ejector;    ( 2 ) a seal water of a vacuum pump; and    ( 3 ) a water used for collecting (meth)acrylic acid in a deodorization device for collecting (meth)acrylic acid from a gas to deodorize the gas.    
     
     
         4 . The method for producing a (meth)acrylic acid derivative according to  claim 3 , wherein at least one selected from the group consisting of: the condensed water of a vapor used for a steam ejector, the seal water of a vacuum pump, and the water used for collecting (meth)acrylic acid in the deodorization device; is cooled to lower than 40° C., or diluted with water, or subjected to both the cooling and the dilution operations to be used as the raw material.  
     
     
         5 . The method for producing a (meth)acrylic acid derivative according to  claim 4 , wherein the (meth)acrylic acid derivative is (meth)acrylate or a polymerized product of (meth)acrylic acid.  
     
     
         6 . The method for producing a (meth)acrylic acid derivative according to  claim 5 , wherein the aqueous solution of (meth)acrylic acid and purified (meth)acrylic acid are used as the raw materials.