Research on Enzymatic Hydrolysis Lignin Modified Petroleum Asphalt

Abstract

In this paper, a series of enzymatic hydrolysis lignin modified petroleum asphalts were prepared. The physical properties such as softening point, ductility at low temperature and penetration of the modified asphalt were investigated. The penetration index of asphalt modified with EHL was higher than that of unmodified asphalt, equivalent softening point increased and equivalent brittle point decreased with the increase of EHL amount, which showed that the addition of EHL was favorable to reduce the temperature susceptivity of asphalt. When the EHL was 4%, the ductility was 39.0 cm. Meanwhile, low temperature performance of asphalt could be further improved by adding EHL and a small amount of SBS.

Preparation, Characterization, and Performance Evaluation of Petroleum Asphalt Modified with Bio-Asphalt Containing Furfural Residue and Waste Cooking Oil

“…Making use of the natural aromatic structure of lignin, lignin exhibited excellent compatibility with the polycyclic aromatic hydrocarbons in petroleum asphalt when mixed [16]. When petroleum asphalt was modified with lignin, the resulting bio-asphalt exhibited a higher thermal stability than the petroleum asphalt [17][18][19]; however, the lignin molecules could absorb the low molecular oil components in the asphalt, resulting in a sharp decrease in the thermal ductility of the modified asphalt [20,21].…”