Sulphur additive and sulphur modified bitumen

A process for preparing sulphur modified bitumen composition, the process consisting of:

• heating bitumen at a temperature in a range of 120-160° C. to obtain molten bitumen;
• preparing a sulphur additive;
• and
• contacting 95% of molten bitumen with 5% of sulphur additive at 180° C. for 15 minutes under stirring at a speed of 50-400 rpm to obtain the sulphur modified bitumen composition, wherein preparing the sulphur additive consists of:
• heating sulphur to obtain molten sulphur, wherein the sulphur is a refinery by-product;
• contacting the molten sulphur with two H2S suppressants, bitumen, and at least one smell masking agent to obtain a mixture, wherein one of the two H2S suppressants is iron (III) ethylhexanoate (Fe(EHA)3) and the other H2S suppressant is bentonite clay, wood, charcoal, refinery FCC (Fluid Catalytic Cracking) spent catalyst, refinery DHDS (Diesel Hydrodesulphurization) spent catalyst, or a combinations thereof;
• heating the mixture at a temperature in a range of 120-160 for a time period in a range of 20 minutes to 140 minutes to obtain a heated mixture;
• and
• cooling the heated mixture to obtain the sulphur additive.