Method for extracting p-tertbutyl benzaldehyde from oxidation reactant of p-tertbutyl methylbenzene through integration of liquid-liquid extraction crystallization and decompression sidetrack rectification
A technology of p-tert-butyltoluene and tert-butyl benzoic acid, applied in the field of p-tert-butyl benzaldehyde, can solve the problems of inconvenient control of product quality, large equipment investment, long technological process, etc., and achieve convenient product quality and equipment investment. Reduced, no impact on the environment
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[0028] Example 1, the method for the integrated separation of p-tert-butyl toluene, p-tert-butyl benzaldehyde and p-tert-butyl benzoic acid with liquid-liquid extraction crystallization and vacuum sideline distillation, refer to figure 1 Shown process diagram and figure 2 with image 3 In the device shown, the specific process of the integrated process of extractive crystallization and vacuum side-line distillation is: at room temperature, raw materials ② It is the mixed liquid of p-tert-butyltoluene, p-tert-butylbenzaldehyde and p-tert-butylbenzoic acid that first enters the extraction crystallization tower 1, the extractant ① Benzene enters the extraction crystallization tower 1 under the raw materials, fully stirs the raw materials, controls the temperature of the extraction crystallization tower to 28.3℃, separates and crystallizes by layers, the raffinate phase and the extraction phase reach equilibrium in the standing section, the extraction phase ③ and the extraction pha...
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[0030] Example 2 is basically the same as Example 1, but the raw material composition in step (1) is: 37.1% p-tert-butyl toluene, 52.23% p-tert-butyl benzaldehyde and 10.67% p-tert-butyl benzoic acid. In step (2), the mass ratio of raw material / extractant toluene is 1:0.7-1.0; the actual number of stages of the extraction crystallization section is 4 stages.
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