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US 12,767,628 B2Granted
Method for preparing acrylic acid
AssigneeLG Chem, Ltd.
InventorsByeong Gil Lyu, Mi Kyung Kim, Eun Kyo Kim, Hye Bin Kim
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Abstract
Provided is a method for preparing an acrylic acid, in which a lactic acid aqueous solution is dehydrated to prepare a reaction product stream, from which by-products are removed using an extraction column, an extractant recovery column, a first separation column, a second separation column, and a refining column to prepare a high-purity acrylic acid.
Claims10
A method for preparing an acrylic acid, the method comprising:
- supplying a reaction product stream prepared by a dehydration reaction of a lactic acid aqueous solution to an extraction column, and in the extraction column, separating an upper discharge stream including an acrylic acid using an extractant and supplying the upper discharge stream to an extractant recovery column;
- in the extractant recovery column, separating a lower discharge stream including the acrylic acid and supplying the lower discharge stream to a first separation column;
- in the first separation column, separating a low-boiling point by-product to an upper portion, and separating a lower discharge stream including the acrylic acid and supplying the lower discharge stream to a second separation column;
- in the second separation column, separating a high-boiling point by-product to a lower portion, and supplying an upper discharge stream including the acrylic acid to a refining column;
- and
- in the refining column, separating an upper discharge stream including the acrylic acid, and refluxing a lower discharge stream including hydroxyacetone to the extraction column,
- wherein water and hydroxyacetone are separated to a lower portion of the extraction column.
4 more elements
Dependencies are inferred from the claim text.