Regeneration method of extracting solvent for extracting, rectifying and separating styrene
An extractive distillation and extractive distillation tower technology, which is applied in the field of regeneration of solvents used for extractive distillation and separation of styrene, can solve the problems of poor performance, aggravated solvent deterioration, and inability to separate by distillation, and achieve styrene polymer The effect of reducing and stabilizing solvent performance
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example 1
[0028] Take the composition as pyrolysis gasoline C shown in Table 1 8 distillate as raw material, according to figure 1 The flow process carries out extraction and rectification on the raw material, recovers the styrene in it, and purifies the poor solvent. The used extraction and rectification solvent contains 80% by mass of sulfolane and 20% by mass of dimethylacetamide, and the top of the solvent recovery tower uses water separated from the top material as the reflux liquid. Part of the poor solvent discharged from the bottom of the solvent recovery tower enters the upper part of the solvent purification tower 106, and the solvent purifier enters the solvent purification tower from the upper part, and the styrene polymer is separated from the poor solvent in the solvent purification tower to be purified. The purified poor solvent and water are heated and injected into the lower part of the solvent recovery tower 104 as stripping gas, and the styrene polymer enters the mid...
example 2
[0040] By the method of example 1 from pyrolysis gasoline C 8 Separation of styrene in the cut, the difference is that the extraction and rectification solvent used contains 70% by mass of triethylene glycol, 30% by mass of dimethylacetamide, using C 8 Aromatic hydrocarbon mixture is used as a solvent scavenger, and its composition is shown in Table 4. During extractive distillation operation, the mass ratio of the solvent scavenger and the lean solvent passed into the solvent purification tower 106 is 0.4: 1, and the water and lean solvent passed into the solvent purification tower 106 are The mass ratio of the solvent is 0.3:1, and the separation results and the running time of the device are shown in Table 5.
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