PROCESS AND APPARATUS FOR SEPARATION AND PURIFICATION OF CONJUGATED DIENE

摘要

A process for separating and purifying a conjugated diene which comprises a step of distilling a hydrocarbon mixture containing 80 % or more of a conjugated diene in a low boiling fraction distillation column 14 in the presence of a polymerization inhibitor, to give a first bottom fraction, a step of distilling the first bottom fraction in a high boiling fraction distillation column 16 in the presence of a polymerization inhibitor, to give a second bottom fraction and a distillate fraction, a step of measuring the concentrations of a polymerization inhibitor contained in the first and second bottom fractions, a first control step of adding a polymerization inhibitor to the low boiling fraction distillation column 14 and/or the high boiling fraction distillation column 16 in amounts adjusted depending on the respective concentrations of a polymerization inhibitor contained in the first and second bottom fractions, to thereby control the concentrations of the polymerization inhibitor contained in the first and second bottom fractions, a step of measuring the concentration of a polymerization inhibitor contained in the distillate fraction, and a second control step of adding a polymerization inhibitor to the high boiling fraction distillation column 16 in an amount adjusted depending on the concentration of a polymerization inhibitor contained in the distillate fraction, to thereby control the concentration of a polymerization inhibitor contained in the distillate fraction. The process allows the suppression of generation of a popcorn polymer with good efficiency and with stability.