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AssigneeYara International Asa
InventorsWolfram Franke, Hilde Brekke Dahl Thommesen
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The present application relates to a method to prevent the emission of hydrogen sulphide in the production of hot bitumen or asphalt having a temperature of between 150 and 200° C., wherein the method comprises the steps of providing a bituminous or asphalt mixture, heating the mixture until a temperature of between 150-200° C. and adding an aqueous calcium nitrate solution or a calcium nitrate powder while mixing the bituminous or asphalt mixture. The present application furthermore relates to the use of an aqueous calcium nitrate solution or a calcium nitrate powder during mixing of a bituminous or asphalt mixture in the production of a hot bitumen or asphalt having a temperature of between 150 and 200° C. to prevent the emission of hydrogen sulphide.
A method to reduce the emission of hydrogen sulphide in the production of hot bitumen or asphalt, wherein the method comprises the steps of:
A method comprising adding calcium nitrate to a bituminous or asphalt mixture while mixing at a temperature between 150 and 200° C., the bituminous or asphalt mixture comprising sulfide, wherein the emission of hydrogen sulphide is prevented, the calcium nitrate being in the form of a calcium nitrate solution or powder, wherein the calcium nitrate powder has a particle size of less than 0.5 mm.
Dependencies are inferred from the claim text.