A multi-level spray system is provided for quenching of reactor effluent gas comprising acrylonitrile and ammonia. The system comprises at least first and second spray bars, each bar extending substantially across a diameter of a quench vessel. The first spray bar is located below and parallel to the second spray bar. Each bar comprises arms that extend substantially perpendicular to its respective bar, each arm having at least two extenders extending substantially perpendicular to its respective arm. Each extender comprises a nozzle configured to downwardly spray a hollow cone spray of a quench liquid. Spray from the first and second bars, in combination, provides a downward wall of projected spray that covers more surface area of a horizontal cross section of the vessel below the first spray bar than a surface area of the same horizontal cross section covered by the first projected spray alone.