Method for extracting α-methylstyrene dimer from phenol tar
A technology of methyl styrene dimer and tar, which is applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbon purification/separation, etc., can solve the problem that fine chemicals in phenol tar are not fully utilized, and achieve improvement Overall value-added effect
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Embodiment 1
[0024] The process of first crystallization and then rectification is adopted. The crystallization process is to mix n-hexane and phenol tar initial distillation product at a mass ratio of 3:1. The dissolution temperature is controlled at 42°C, and the temperature is lowered to 22°C after dissolution (1°C every 30 minutes). , the crystallization is completed, and then vacuum filtration is carried out to obtain the cumylphenol product at first, and the cumylphenol is separated from the initial distillation product of phenol tar to obtain the crystallization solvent at the same time.
[0025] The rectification process is as follows: the packing height of the rectification tower is 80cm (40 trays), the temperature of the bottom of the tower is 175°C, the temperature of the top of the tower is 133°C, the reflux ratio is 3:1, the operating pressure is -0.090Mpa, and the target product is α-methylbenzene The product purity of ethylene dimer is shown in Table 1.
[0026] Table 1 α-me...
Embodiment 2
[0030] The process of first crystallization and then rectification is adopted. The crystallization process is to mix n-hexane and phenol tar initial distillation products in a mass ratio of 3:1. The dissolution temperature is controlled at 45°C, and the temperature is lowered to 25°C after dissolution (3°C every 30 minutes). , the crystallization is completed, and then vacuum filtration is carried out to obtain the cumylphenol product at first, and the cumylphenol is separated from the initial distillation product of phenol tar to obtain the crystallization solvent at the same time.
[0031] The rectification process is that the packing height of the rectification tower is 80cm (40 trays), the temperature of the tower bottom is 178°C, the temperature of the tower top is 137°C, the reflux ratio is 4:1, the operating pressure is -0.095Mpa, and the target product is α-methylbenzene The product purity of ethylene dimer is shown in Table 2.
[0032] Table 2 α-methylstyrene dimer
...
Embodiment 3
[0036] The process of first crystallization and then rectification is adopted. The crystallization process is to mix n-hexane and phenol tar initial distillation product at a mass ratio of 3:1. The dissolution temperature is controlled at 43°C, and the temperature is lowered to 24°C after dissolution (1°C every 30 minutes). , the crystallization is completed, and then vacuum filtration is carried out to obtain the cumylphenol product at first, and the cumylphenol is separated from the initial distillation product of phenol tar to obtain the crystallization solvent at the same time.
[0037] The rectification process is as follows: the packing height of the rectification tower is 80cm (40 trays), the temperature of the bottom of the tower is 176°C, the temperature of the top of the tower is 135°C, the reflux ratio is 4:1, the operating pressure is -0.090Mpa, and the target product is α-methylbenzene The product purity of ethylene dimer is shown in Table 3.
[0038] The product ...
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