Method for recovering dilute acetic acid through extraction by cyclohexyl acetate
A technology of cyclohexyl acetate and dilute acetic acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry and other directions, can solve the problems of low acetic acid recovery rate and long process flow
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Embodiment 1
[0030] The invention utilizes cyclohexyl acetate, an intermediate product of the cyclohexanone plant, as an extractant, and extracts and rectifies the dilute acetic acid produced by the cyclohexanone plant to separate the acetic acid from water to recover the acetic acid for reuse. The production scale of the cyclohexanone plant is 100,000 tons / year.
[0031] Such as figure 1 Shown, the dilute acetic acid feed (5) of cyclohexanone plant by-product enters the top of the extraction tower (1), and the intermediate product cyclohexyl acetate feed (6) of the cyclohexanone plant enters the bottom of the extraction tower (1). The acetic acid in the dilute acetic acid (5) is extracted by the stream through the countercurrent extraction method. The raffinate waste water (8) flows out from the bottom of the extraction tower (1) and is sent out. The extraction phase (7) is discharged from the top of the extraction tower (1), returns to the acetic acid separation tower (2), and is fed f...
Embodiment 2
[0035] According to the conditions and steps described in Example 1, only the production scale of the cyclohexanone plant was changed to 200,000 tons / year.
[0036] The process parameters are as follows: the operating temperature of the extraction tower is 50 ° C, the operating pressure is 0.46 MPaA, the mass ratio of the dilute acetic acid feed at the top of the extraction tower to the cyclohexyl acetate feed at the bottom of the extraction tower = 1:6.3, and the dilute The acetic acid concentration of acetic acid feed is 49% (mass), and temperature is 50 ℃, and pressure is 0.56MPaA, and the temperature of cyclohexyl acetate feed at the bottom of extraction tower tower is 50 ℃, and pressure is 0.61MPaA, and acetic acid separating tower tower top operation The temperature is 118°C, the operating temperature at the bottom of the tower is 186°C, the operating pressure is 0.16MPaA, the reflux ratio is 6.7, the temperature of the feed stream of the acetic acid separation tower is 1...
Embodiment 3
[0039] According to the conditions and steps described in Example 1, only the production scale of the cyclohexanone plant was changed to 400,000 tons / year.
[0040] The process parameters are as follows: the operating temperature of the extraction tower is 32 ° C, the operating pressure is 0.21 MPaA, the mass ratio of the dilute acetic acid feed at the top of the extraction tower to the cyclohexyl acetate feed at the bottom of the extraction tower = 1:8.9, and the dilute The acetic acid concentration of acetic acid feed is 39% (mass), and temperature is 32 ℃, and pressure is 0.38MPaA, and the temperature of cyclohexyl acetate feed at the bottom of extraction column is 32 ℃, and pressure is 0.41MPaA, and acetic acid separating tower top operation The temperature is 111°C, the operating temperature at the bottom of the tower is 176°C, the operating pressure is 0.14MPaA, the reflux ratio is 9.1, the temperature of the feed stream of the acetic acid separation tower is 131°C, and t...
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Abstract
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