HEADS COLUMN OPERATION WITH INHIBITOR ADDITION

摘要

An apparatus comprises a heads column, the heads column configured to receive a crude nitriles feed stream and to distill the crude nitriles feed stream and produce a heads column overhead stream comprising HCN at the top of the heads column, and a heads bottom liquid stream comprising acrylonitrile product at the bottom of the heads column. The apparatus comprises an overhead system comprising a condenser, the condenser configured to condense the heads column overhead stream. The apparatus comprises an acid addition system. The acid addition system is configured to add an acid to an inlet to maintain a predetermined concentration of acid in an HCN final product, and to maintain a predetermined concentration of acid in the heads column bottom liquid.