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Effect of Catalysts on Effluents During Air Blowing of Asphalt

Abstract Air blowing of asphalt was performed in presence of catalysts. The effluents (distillate) obtained during air blowing were analyzed to see the effect of catalysts on them. This study investigates the effluents in detail, using physical and chemical methods. Catalysts used were metallic chlorides in varying quantities and also in combination with manganese dioxide. The aim of using different catalysts was to develop a suitable catalyst, which can perform hardening of asphalt at par with other available catalyst, at the same time keeping the effluents relatively low and free of acidic gases. These acidic gases decrease the life of the plant and cause environmental problems. During a 15 h air oxidation period, it was observed that for feed I asphalt the physical (specific gravity & viscosity) and chemical (acidity & composition) properties of the effluent oils, were effected by the catalysts. Amount of effluents were different for different catalysts. Saturate contents of the effluent were increased due to catalyst, while naphthalene and polar aromatic decreased. Effluents were free of asphaltene. The variation in the properties of effluents obtained during feed asphalts II and III air blowing, were not so distinct than with feed I. It indicates that the extent of changes in the properties of effluents depends on the composition of feedstock. Effluent oils were investigated by instrumental analytical techniques such as GLC, UV. Some of the properties of blown asphalt are also reported.