Systems and techniques for polymer degassing

A purge system comprising:

• a purge column, the purge column comprising:
• a flake inlet for introducing a reactor product stream comprising polymer flakes and one or more heavy hydrocarbons;
• a stripping zone, the stripping zone comprising a stripping fluid distributor for injecting a stripping fluid comprising one or more light olefins into the stripping zone and adapted to provide stripped polymer flakes;
• a stripping fluid outlet for releasing used stripping fluid from the purge column;
• and
• a conical bottom portion below the stripping fluid distributor;
• a displacement unit below the purge column and partially overlapping the conical bottom portion of the purge column, the displacement unit configured to receive stripped polymer flakes from the stripping zone, and further configured to displace at least a portion of residual stripping fluid from the stripped polymer flakes by introducing nitrogen, wherein the displacement unit comprises a first displacement outlet disposed at an upper portion of the displacement unit such that the first displacement outlet is higher than a lower edge of the conical bottom portion of the purge column, the first displacement outlet configured to expel displaced fluid from the displacement unit;
• and
• a stripped flake outlet.