D2.1 Choice for a sulphur free odorant

This report describes the selection of a potential third sulphur free odorant for hydrogen for the research within the framework of Hydelta WP2: Odorization.

Two odorants that are already known for natural gas, namely Tetrahydrothiophene (THT) and GASODOR® S-free, were already pre-selected. After a literature search, three odorants were tested for the odour character and the odour behaviour after a selection on the properties of the odorant.

The candidate odorant 2-hexyne was ultimately selected on the basis of the following properties:

• an unpleasant distinctive characteristic odour
• a low odour threshold
• low toxicity
• sulphur-free
• workable dosage: nominal 15 mg/m³(n), minimum 10 mg/m³(n), maximum 35 mg/m³(n).

This odorant will be further tested in the HyDelta WP2 study.