Method of separating/purifying conjugated diene and separation/purification apparatus
A method of separating and purifying conjugated dienes includes a step of obtaining a first bottom product by taking out a hydrocarbon mixture including conjugated diene under an environment in the presence of a polymerization inhibitor including at least one of nitrite and di-lower aklylhydroxylami...
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Sprache: | eng |
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Zusammenfassung: | A method of separating and purifying conjugated dienes includes a step of obtaining a first bottom product by taking out a hydrocarbon mixture including conjugated diene under an environment in the presence of a polymerization inhibitor including at least one of nitrite and di-lower aklylhydroxylamine in a first extractive distillation column; a step of obtaining a second bottom product and a distillation portion by distilling the first bottom product in a first diffusion column; a step of obtaining a third bottom product by taking out the distillation portion under an environment in the presence of the polymerization inhibitor in a second extractive distillation column; a step of obtaining a fourth bottom product by distilling the third bottom product in a second diffusion column; a step of recovering the second bottom product and fourth bottom product and supplying to the first extractive distillation column and/or second extractive distillation column; a step of measuring concentration of a polymerization inhibitor included in the second bottom product and/or fourth bottom product; and a control step of controlling the concentration of the polymerization inhibitor included in the second bottom product and/or fourth bottom product by changing a supply amount of the polymerization inhibitor to the first extractive distillation column and/or second extractive distillation column in accordance with the measured concentration of the polymerization inhibitor. According to the method, generation of rubbery substances in an apparatus can be efficiently and stably suppressed and an excessive polymerization inhibitor is not left in conjugated dienes. |
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