procedures to prevent the harzbildung in prone to harzbildung hydrocarbon groups

摘要

A small proportion, preferably 0.01--0.05 per cent of hard or other wood tar or a fraction thereof is added to cracked gasolene or other liquid hydrocarbon motor fuel to prevent gum formation and fall in anti-knock value. The 240--280 DEG C. and 240--300 DEG C. fractions of oak and hickory wood tars are exceptionally efficient.