METHOD AND APPARATUS FOR DISTILLING UNSATURATED NITRILE, AND METHOD FOR PRODUCING UNSATURATED NITRILE

摘要

PROBLEM TO BE SOLVED: To provide a method for distilling an unsaturated nitrile, by which a stable operation of a stripping column in a recovery and purification process of the unsaturated nitrile and a by-product thereof is achieved when industrially producing the unsaturated nitrile such as acrylonitrile.

SOLUTION: The method for distilling the unsaturated nitrile includes a step to distill the unsaturated nitrile with the stripping column to which first and second heating routes are connected, wherein the quantity of heat to be supplied to the stripping column via the second heating route is set to be 1-20% with respect to the sum of the quantities of heat supplied to the stripping column via the first and second heating routes.

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