Patent ID: 6383464
Filing Date: 2002-05-07
Classification: B01D,C10C

Abstract:
A method for reducing sulfur-oxide emissions from an asphalt blowing process comprising:combining asphalt and an emission-reducing additive comprising at least one additive compound selected from the group consisting of metal hydroxides, metal oxides, metal carbonates, and metal bicarbonates, wherein the metal is selected from the group consisting of sodium, potassium, calcium, magnesium, zinc, copper, and aluminum; subjecting the asphalt to a blowing process that produces a gas stream containing sulfur-containing compounds; passing the gas stream through a filter that condenses and removes at least a portion of the sulfur-containing compounds; and subjecting the filtered gas stream to an incineration process; wherein the combination of the filter and the emission-reducing additive reduces sulfur-oxide emissions from the asphalt blowing process by at least about 50% by weight over the same process without the filter and emission-reducing additive.