a glycol regeneration system for a dehydrator having an absorber for contact of gas with glycol , a pump to circulate glycol , a reboiler for heating glycol to vaporize water , and a still column for distilling the glycol vapor from the reboiler . the glycol regeneration system includes a reflux jacket chamber for receipt of the glycol from the absorber wherein the gas will separate by gravity from the glycol . a preheater in the reboiler will heat the gas separated in the reflux jacket chamber . the preheated gas is passed through the glycol in the reboiler to strip water vapor therefrom . at least one riser tube in communication with the still column will be in heat exchange relation with the glycol in the reflux jacket chamber to allow water vapor and waste gas to rise through the riser tube . at least one outlet in communication with the riser tube drains water vapor and waste gas therefrom .