Pure Hydrocarbon Type Inhibitor (Radical Scavenger)
Hydrogen donating hydroaromatics have been applied as inhibitors against deterioration of hydrocarbon products.
Multi-component type additives were produced from coal tar fractions and heavy petroleum fractions, and their additive effects were investigated towards petroleum products, rubbers and plastics. Obvious inhibiting effects were observed against deterioration by heat, oxygen, radiation and UV-ray. Evident radical scavenging abilities were observed for the hydroaromatics including the multi-component additives by the experiments using N, N-diphenyl-N'-picrylhydrazyl at 50°C in air. From these results, the inhibiting abilities of the additives can be attributed to their radical scavenging ones.
In conventional autoxidation studies, hydroaromatics have been considered to be easily oxidized, and they have never been applied as inhibitors. However, prominent inhibiting abilities of hydroaromatics were found even in the presence of oxygen, depending on oxygen partial pressure.
In addition, it was also confirmed that hydroaromatics were durable to heat and radiation, and they are expected to be used in wide variety of fields where the conventional radical scavengers are not used, for instance, prevention of coke and sludge formation.