A process of removing volatile compounds from a concentrated fluid comprising 10 to 80 wt % of at least one halogenated butyl rubber and from 20 to 90 wt% of at least one volatile compound whereby the aforementioned components add up to 90 to 100 wt% of the total mass of the concentrated fluid which comprises at least the step of: a) feeding a concentrated fluid into at least one drying unit, the drying unit comprising in flow direction at least I) a first drying section and II) a main extruder section comprising at least an • extruder degassing section comprising at least a conveying section and a vent port with one or more vapor lines, • an accumulating section and an outlet section, whereby volatile compounds are removed through the vent ports and vapor lines; whereby ▪ the first drying section is either a kneader or a first extruder and the main extruder section is a main extruder or ▪ the drying section and the main extruder section are both part of a main extruder, whereby the drying section is upstream the main extruder section and has a smaller cross section than the main extruder section and ▪ the product obtained at the outlet section of the main extruder is substantially free of volatile compounds. a) feeding a concentrated fluid into at least one drying unit, the drying unit comprising in flow direction at least I) a first drying section and II) a main extruder section comprising at least an • extruder degassing section comprising at least a conveying section and a vent port with one or more vapor lines, • an accumulating section and an outlet section, whereby volatile compounds are removed through the vent ports and vapor lines; whereby ▪ the first drying section is either a kneader or a first extruder and the main extruder section is a main extruder or ▪ the drying section and the main extruder section are both part of a main extruder, whereby the drying section is upstream the main extruder section and has a smaller cross section than the main extruder section and ▪ the product obtained at the outlet section of the main extruder is substantially free of volatile compounds. I) a first drying section and II) a main extruder section comprising at least an • extruder degassing section comprising at least a conveying section and a vent port with one or more vapor lines, • an accumulating section and an outlet section, whereby volatile compounds are removed through the vent ports and vapor lines; whereby ▪ the first drying section is either a kneader or a first extruder and the main extruder section is a main extruder or ▪ the drying section and the main extruder section are both part of a main extruder, whereby the drying section is upstream the main extruder section and has a smaller cross section than the main extruder section and ▪ the product obtained at the outlet section of the main extruder is substantially free of volatile compounds. • extruder degassing section comprising at least a conveying section and a vent port with one or more vapor lines, • an accumulating section and an outlet section, whereby volatile compounds are removed through the vent ports and vapor lines; whereby ▪ the first drying section is either a kneader or a first extruder and the main extruder section is a main extruder or ▪ the drying section and the main extruder section are both part of a main extruder, whereby the drying section is upstream the main extruder section and has a smaller cross section than the main extruder section and ▪ the product obtained at the outlet section of the main extruder is substantially free of volatile compounds. ▪ the first drying section is either a kneader or a first extruder and the main extruder section is a main extruder or ▪ the drying section and the main extruder section are both part of a main extruder, whereby the drying section is upstream the main extruder section and has a smaller cross section than the main extruder section and ▪ the product obtained at the outlet section of the main extruder is substantially free of volatile compounds.