Method for producing (meth) acrylic acid derivitive
View Patent ↗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 selected from (meth)acrylate or a polymerized product of (meth)acrylic acid, comprising
reacting (meth)acrylic acid with an alcohol or polymerizing (meth)acrylic acid using as a raw material an aqueous solution of (meth)acrylic acid without further purification to produce a (meth)acrylic acid derivative,
wherein the aqueous solution of (meth)acrylic acid is formed in a production/storage step of (meth)acrylic acid and comprises at least one selected from the group consisting of:
(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; and
wherein the aqueous solution of (meth)acrylic acid and purified (meth)acrylic acid are used as the raw materials.
2. The method for producing a (meth)acrylic acid derivative according to claim 1 , 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.
3. 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%.
4. The method for producing a (meth)acrylic acid derivative according to claim 1 , comprising reacting (meth)acrylic acid with an alcohol.
5. The method for producing a (meth)acrylic acid derivative according to claim 1 , comprising polymerizing (meth)acrylic acid.
6. The method for producing a (meth)acrylic acid derivative according to claim 1 , wherein the aqueous solution of (meth)acrylic acid comprises a condensed water of a vapor used for a steam ejector.
7. The method for producing a (meth)acrylic acid derivative according to claim 1 , wherein the aqueous solution of (meth)acrylic acid comprises a seal water of a vacuum pump.
8. The method for producing a (meth)acrylic acid derivative according to claim 1 , wherein the aqueous solution of (meth)acrylic acid comprises a water used for collecting (meth)acrylic acid in a deodorization device for collecting (meth)acrylic acid from a gas to deodorize the gas.