Recovering method of acetic acid from effluent of terephthalic acid production process
AssigneesKi Joon KANG, AMTPacific Co., Ltd.
InventorKi Joon Kang
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Abstract
The present invention relates to a recovering method of acetic acid using an apparatus comprising a dehydration tower, a condenser and a separation tank. As p-xylene is used as an azeotropic agent to form an azeotrope with water, which is discharged from the top of the dehydration tower, and the remaining p-xylene is discharged from the bottom of the dehydration tower along with acetic acid, the acetic acid containing the p-xylene azeotropic agent can be recycled directly to a reactor for producing terephthalic acid without further separation process and without regard to the content of the p-xylene azeotropic agent which is recovered along with acetic acid.
Claims9
A recovering method of acetic acid from effluent from a terephthalic acid production process using an apparatus comprising:
- a dehydration tower for recovering acetic acid from a mixture of water and acetic acid, which is produced from catalytic oxidation of p-xylene with air in the presence of acetic acid, by azeotropic distillation using an azeotropic agent;
- a condenser for condensing gaseous azeotropic agent and water discharged from the top of the dehydration tower;
- and
- a separation tank for removing water by separating the azeotropic agent from water,
- wherein p-xylene is used as the azeotropic agent to form an azeotrope with water, which is discharged from the top of the dehydration tower, and remaining p-xylene is discharged from the bottom of the dehydration tower along with acetic acid.
Dependencies are inferred from the claim text.