The results showed that both methods ofairblowing and thermal polycondensation in the presence of nitrogen raised the asphalt softening points, and increased coke yields and heptane insolubles.
结果表明,空气氧化和氮气热缩聚可提高石油沥青的软化点、焦产率和正庚烷不溶物含量。
2
Being as catalysts, several transition metal of compound can be used to air-blowingasphalt, such as iron, cobalt and manganese.