Abstract: A coating material for coating a pipe contains asphalt and polymer dissolved in organic solvent. The coating material has Theological properties such that it can be easily applied at ambient temperature to form a coating on the pipe. After drying, the coating is resistant to abrasion as measured by at least about 1,000,000 revolutions before failure when tested by ASTM A 926-97, Procedure 7.4.

Abstract: In a method for reducing hydrogen chloride emissions from an asphalt air-blowing process, an asphalt is subjected to an air-blowing process where air is bubbled through hot asphalt to raise the softening point of the asphalt. The fumes from the air-blowing process are bubbled through a liquid seal in a knockout tank before going to an incinerator and finally being emitted to the atmosphere. The knockout tank normally operates to condense oil in the fume stream, and the liquid seal is composed of this oil, as well as some of the water evolved in the air-blowing process. When using ferric chloride or ferrous chloride as a catalyst in the air-blowing process, the fume stream contains significant levels of hydrogen chloride.