Method for producing acrylic acid
AssigneeLG Chem, Ltd.
InventorsMi Kyung Kim, Hyebin Kim, Jaeik Lee, Eunkyo Kim
Life of this patent
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Abstract
Provided is a method for producing acrylic acid, the method including: preparing a reaction product containing acrylic acid by supplying lactic acid to a reactor and performing a dehydration reaction; supplying a reactor discharge stream containing the reaction product to a cooling tower and condensing the result to transfer a lower discharge stream including a condensate to an acrylic acid purification unit and supplying a non-condensate discharged as an upper discharge stream to a distillation tower; and, in the distillation tower, circulating the lower discharge stream containing acrylic acid to the cooling tower, and removing acetaldehyde from the upper discharge stream.
Claims6
A method for producing acrylic acid, the method comprising the following steps in sequence:
- preparing a reaction product including acrylic acid by supplying lactic acid to a reactor and performing a dehydration reaction;
- supplying a reactor discharge stream including the reaction product to a cooling tower that condenses through cooling the reactor discharge stream in a gas phase to yield a condensate and a non-condensate and transferring a lower discharge stream including the condensate to an acrylic acid purification unit, and supplying the non-condensate discharged as an upper discharge stream to a distillation tower;
- and
- in the distillation tower, circulating a distillation tower lower discharge stream including acrylic acid to the cooling tower, and removing acetaldehyde from a distillation tower upper discharge stream,
- wherein the cooling tower has an operation pressure of 200 kPa to 1000 kPa, and the distillation tower has an operation pressure of 100 kPa to 900 kPa, and
- wherein the operation pressure of the distillation tower is lower than the operation pressure of the cooling tower,
- wherein a partial stream of the cooling tower lower discharge stream is refluxed to the cooling tower after passing through a first cooler,
- wherein the distillation tower lower discharge stream is heated by going through a reboiler before being circulated to the cooling tower, and then a partial stream is circulated to the cooling tower and the remaining stream is refluxed to the distillation tower, and
- the heat source of the reboiler uses the heat removed from the first cooler.
Dependencies are inferred from the claim text.