HEADS COLUMN OVERHEAD SYSTEM

摘要

An apparatus comprises a heads column and an overhead system. The heads column is configured to receive a crude nitriles feed stream. The heads column is configured to distill the crude nitriles feed stream under a partial vacuum and produce a heads column overhead stream comprising HCN at the top of the heads column, and a bottom liquid stream comprising acrylonitrile product at the bottom of the heads column. The heads column comprises a condenser that is configured to condense the heads column overhead stream. The apparatus comprises a glandless pump in the overhead system. The pump is configured to pump at least a portion of the heads column overhead stream as a reflux stream to the heads after the heads column overheard stream is condensed in the condenser.