A process comprising: a. polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, VOC (Volatile Organic Compounds) and a catalyst system; b. contacting the polymerized solids with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream, wherein the catalyst system is deactivated and the polymerization has been terminated by injection of the catalyst poison; c. maintaining the passivated stream in an agitated state within a second reactor; and d. contacting the passivated stream within the second reactor with a circulating gas comprising unreacted monomer in a range of from 50.0 to 99.5 wt% for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt% compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream; wherein the first and second reactor vessels are fluidized bed gas phase reactors; wherein the process comprises conveying the raw product stream to the second reactor; wherein the catalyst poison is contacted with the polymerized solids during conveyance of the raw product stream to the second reactor, or the catalyst poison is contacted with the polymerized solids in the second reactor; and wherein the term VOC means the total of n-C 7 to n-C 12 hydrocarbons comprising oligomers of C 2 and C 3 material as measured by the VOC measurement technique, and includes all isomers eluting between the n-C 7 to n-C 12 hydrocarbon peaks using the GC column. a. polymerizing olefin monomers and optionally comonomers in a first reactor vessel, thereby forming a raw product stream comprising polymerized solids, unreacted monomer and optionally comonomer, the polymerized solids comprising olefin polymer, VOC (Volatile Organic Compounds) and a catalyst system; b. contacting the polymerized solids with a catalyst poison selected from carbon monoxide, carbon dioxide, oxygen, water, alcohols, amines, or mixtures thereof, thereby forming a passivated stream, wherein the catalyst system is deactivated and the polymerization has been terminated by injection of the catalyst poison; c. maintaining the passivated stream in an agitated state within a second reactor; and d. contacting the passivated stream within the second reactor with a circulating gas comprising unreacted monomer in a range of from 50.0 to 99.5 wt% for a residence time, thereby reducing the concentration of VOC in the polymerized solids by at least 10 wt% compared to the level before entering the second reactor, thereby forming a purified olefin polymer solids stream; wherein the first and second reactor vessels are fluidized bed gas phase reactors; wherein the process comprises conveying the raw product stream to the second reactor; wherein the catalyst poison is contacted with the polymerized solids during conveyance of the raw product stream to the second reactor, or the catalyst poison is contacted with the polymerized solids in the second reactor; and wherein the term VOC means the total of n-C 7 to n-C 12 hydrocarbons comprising oligomers of C 2 and C 3 material as measured by the VOC measurement technique, and includes all isomers eluting between the n-C 7 to n-C 12 hydrocarbon peaks using the GC column.