Process for producing a purified hydrocarbon stream, said process comprising the steps of (i) contacting in a contact vessel a contaminated hydrocarbon stream and a chemical agent, wherein the temperature in the contact vessel is above the boiling point of the contaminated hydrocarbon stream, wherein the contaminated hydrocarbon stream comprises one or more organoaluminum compounds, thereby producing a purified hydrocarbon stream, wherein the purified hydrocarbon stream has an aluminum content lower than the aluminum content of the contaminated hydrocarbon stream; and (ii) withdrawing said purified hydrocarbon stream from said contact vessel, the process being characterized in that said chemical agent is selected from the group consisting of H-X 1, X 1 -A 1 -X 2, X 1 -A 1 -A 2 -X 2 and X 1 -A 3 =A 4 -X 2, wherein - A 1 and A 2 are independently selected from the group consisting of CR 1 R 2, C=0 and NR 1, of which CR 1 R 2 and C=O are preferred and CR 1 R 2 is most preferred; - A 3 and A 4 are either independently selected from the group consisting of CR 1 and N or alternatively both, A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; of which is preferred that A 3 and A 4 are CR 1 or A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; - X 1 and X 2 are independently selected from the group consisting of OR 1, SR 1, =NR 1, NR 1 R 2, PR 1 R 2, C(=O)R 1, C(=O)OR 1, OC(=O)R 1, C(=O)NR 1 R 2 and NR 1 C(=O)R 2, of which OR 1, =NR 1, NR 1 R 2, C(=O)OR 1 and C(=C)NR 1 R 2 are preferred; and - R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, aryl, substituted alkyl and substituted aryl, wherein substituted alkyl denotes an alkyl substituted with X 1 and substituted aryl denotes an aryl substituted with X 1; with the provision that H-X 1 is not HOH. (i) contacting in a contact vessel a contaminated hydrocarbon stream and a chemical agent, wherein the temperature in the contact vessel is above the boiling point of the contaminated hydrocarbon stream, wherein the contaminated hydrocarbon stream comprises one or more organoaluminum compounds, thereby producing a purified hydrocarbon stream, wherein the purified hydrocarbon stream has an aluminum content lower than the aluminum content of the contaminated hydrocarbon stream; and (ii) withdrawing said purified hydrocarbon stream from said contact vessel, the process being characterized in that said chemical agent is selected from the group consisting of H-X 1, X 1 -A 1 -X 2, X 1 -A 1 -A 2 -X 2 and X 1 -A 3 =A 4 -X 2, wherein - A 1 and A 2 are independently selected from the group consisting of CR 1 R 2, C=0 and NR 1, of which CR 1 R 2 and C=O are preferred and CR 1 R 2 is most preferred; - A 3 and A 4 are either independently selected from the group consisting of CR 1 and N or alternatively both, A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; of which is preferred that A 3 and A 4 are CR 1 or A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; - X 1 and X 2 are independently selected from the group consisting of OR 1, SR 1, =NR 1, NR 1 R 2, PR 1 R 2, C(=O)R 1, C(=O)OR 1, OC(=O)R 1, C(=O)NR 1 R 2 and NR 1 C(=O)R 2, of which OR 1, =NR 1, NR 1 R 2, C(=O)OR 1 and C(=C)NR 1 R 2 are preferred; and - R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, aryl, substituted alkyl and substituted aryl, wherein substituted alkyl denotes an alkyl substituted with X 1 and substituted aryl denotes an aryl substituted with X 1; - A 1 and A 2 are independently selected from the group consisting of CR 1 R 2, C=0 and NR 1, of which CR 1 R 2 and C=O are preferred and CR 1 R 2 is most preferred; - A 3 and A 4 are either independently selected from the group consisting of CR 1 and N or alternatively both, A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; of which is preferred that A 3 and A 4 are CR 1 or A 3 and A 4 are carbon forming part of an aromatic ring or fused ring system; - X 1 and X 2 are independently selected from the group consisting of OR 1, SR 1, =NR 1, NR 1 R 2, PR 1 R 2, C(=O)R 1, C(=O)OR 1, OC(=O)R 1, C(=O)NR 1 R 2 and NR 1 C(=O)R 2, of which OR 1, =NR 1, NR 1 R 2, C(=O)OR 1 and C(=C)NR 1 R 2 are preferred; and - R 1 and R 2 are independently selected from the group consisting of hydrogen, alkyl, aryl, substituted alkyl and substituted aryl, wherein substituted alkyl denotes an alkyl substituted with X 1 and substituted aryl denotes an aryl substituted with X 1;