Method for reducing significant extent evolution of hydrogen sulfide to elemental sulfur and asphalt mix at elevated temperatures.

摘要

There is disclosed a process for preparing a mixture comprising bitumen and sulphur, wherein bitumen and elemental sulphur are mixed at an elevated temperature preferably 130 DEG C to 150 DEG C, in the presence of at least one metal carboxylate or naphthenate which is at least partially soluble in the bitumen at the mixing temperature. Preferred are metal salts of carboxylic acids of at least 12, preferably 16 to 18, carbon atoms per molecule. Suitably the quantity of metal organic salt employed is from 0.05 to 0.5 wt%, calculated as zinc metal, based on the weight of the bitumen. Zinc stearate is especially suitable.