A method of regenerating a desiccant in an off-line treater (10, 15, 40, 45) of a polyolefin production process, the method comprising a heating phase followed by a cooling phase, the heating phase comprising: regenerating at least a portion of the desiccant in the off-line treater (10, 15, 40, 45) using a regenerating medium to yield a regenerating effluent stream comprising the regenerating medium, water, and an impurity; decanting the regenerating effluent stream into a water stream comprising the water and a regenerating stream comprising the regenerating medium and the impurity wherein prior to decanting, the regenerating effluent stream is cooled, wherein the step of cooling comprises cooling the regenerating effluent stream in a cross exchanger wherein the cross exchanger uses a second portion of the regenerating stream to cool the regenerating effluent stream and produce a regenerating effluent stream; and condensing the regenerating effluent stream (282, 284) in a cooling water condenser from the first temperature of the regenerating effluent stream (282, 284) to a second temperature of the regenerating effluent stream (282, 284); separating in a stripper a first portion of the regenerating stream into an impurity stream comprising an impurity and a regenerating recycle stream comprising the regenerating medium and recycling at least a portion of the regenerating recycle stream for use in a treater (10, 15, 40, 45); heating the second portion of the regenerating stream comprising the regenerating medium to yield a heated regenerating stream and recycling at least a portion of the heated regenerating stream for use in the regenerating at least a portion of the desiccant in the off-line treater. regenerating at least a portion of the desiccant in the off-line treater (10, 15, 40, 45) using a regenerating medium to yield a regenerating effluent stream comprising the regenerating medium, water, and an impurity; decanting the regenerating effluent stream into a water stream comprising the water and a regenerating stream comprising the regenerating medium and the impurity wherein prior to decanting, the regenerating effluent stream is cooled, wherein the step of cooling comprises cooling the regenerating effluent stream in a cross exchanger wherein the cross exchanger uses a second portion of the regenerating stream to cool the regenerating effluent stream and produce a regenerating effluent stream; and condensing the regenerating effluent stream (282, 284) in a cooling water condenser from the first temperature of the regenerating effluent stream (282, 284) to a second temperature of the regenerating effluent stream (282, 284); separating in a stripper a first portion of the regenerating stream into an impurity stream comprising an impurity and a regenerating recycle stream comprising the regenerating medium and recycling at least a portion of the regenerating recycle stream for use in a treater (10, 15, 40, 45); heating the second portion of the regenerating stream comprising the regenerating medium to yield a heated regenerating stream and recycling at least a portion of the heated regenerating stream for use in the regenerating at least a portion of the desiccant in the off-line treater.