Continuous steam stripping dealcoholization method for diisooctyl terephthalate
A technology of diisooctyl terephthalate and diisooctyl phthalate, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, and can solve unstable product quality and long process time , high alcohol content, etc., to achieve good product quality, improve product quality, and high dealcoholization efficiency
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Embodiment 1
[0025] A kind of diisooctyl terephthalate continuous stripping method, comprises the steps:
[0026] (1) After catalyzing the esterification reaction of terephthalic acid and excess isooctyl alcohol, the crude product of diisooctyl terephthalate is washed by alkaline washing and washing kettle R103, and pressurized by stripping feed pump P301 Afterwards, after being heated to 165° C. by the stripping feed heater H301, it is fed into between the upper packing layer 3 and the lower packing layer 8 in the stripping dealcoholization tower T301 through the feed distributor 4; Alcohol tower T301 such as figure 1 As shown, including the tower body, the upper section, the middle section and the lower section are respectively provided with an upper packing layer 3, a middle packing layer 5 and a lower packing layer 8 in the tower body, and the feed distributor 4 is located at the upper packing layer 3 and the middle packing layer. Between the packing layers 5; the top of the tower bod...
Embodiment 2
[0038] A kind of diisooctyl terephthalate continuous stripping method, comprises the steps:
[0039] (1) The crude product of diisooctyl terephthalate after the catalytic esterification reaction of terephthalic acid and excess isooctyl alcohol is washed with alkali and water, then heated to 175°C by stripping feed heater H301, and passed through The feed distributor 4 is fed between the upper packing layer 3 and the lower packing layer 8 in the stripping dealcoholization tower T301; the stripping dealcoholization tower T301 includes a tower body, and the tower body is located in three positions of the upper section, the middle section and the lower section The upper packing layer 3, the middle packing layer 5 and the lower packing layer 8 are respectively provided, and the feed distributor 4 is located between the upper packing layer 3 and the middle packing layer 5; the top of the tower body is provided with a gas phase outlet 1 connected to the condenser W301; the superheate...
Embodiment 3
[0048] A kind of diisooctyl terephthalate continuous stripping method, comprises the steps:
[0049] (1) After catalyzing the esterification reaction of terephthalic acid and excess isooctyl alcohol, the crude product of diisooctyl terephthalate is washed with alkali and water, then heated to 170°C by the stripping feed heater H301, and passed through The feed distributor 4 is fed between the upper packing layer 3 and the lower packing layer 8 in the stripping dealcoholization tower T301; the stripping dealcoholization tower T301 includes a tower body, and the tower body is located in three positions of the upper section, the middle section and the lower section The upper packing layer 3, the middle packing layer 5 and the lower packing layer 8 are respectively provided, and the feed distributor 4 is located between the upper packing layer 3 and the middle packing layer 5; the top of the tower body is provided with a gas phase outlet 1 connected to the condenser W301; the supe...
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Abstract
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