Absorber column as "Lean water'. The basic purpose of the absorbercolumn was to absorb gascous produce Acrylonitrile in water andfacilitate removal of inert such as Nitrogen as Absorber off Gas(AOG). This column operates at lower temperature and pressure as aresult of which, trace amount of this HCN was separated out of waterand appears in the Off Gas Vent amounting to a concentration ofabout 30 mg/Nm3 of the total gas flow. In this gas it was observed byGPCB that there was high concentration of Ammonia being releasedfor which the industry was issued notice of direction.