Modified asphalt, method for continuous preparation of modified asphalt by using coal direct liquefaction residue under normal pressure and its application

Abstract

The invention discloses modified asphalt, a method for preparing the modified asphalt by using direct liquefied coal residues in a normal pressure continuous mode, and an application of the modified asphalt. The method comprises the following steps: 1, adding an extracting solvent into the direct liquefied coal residues for performing thermal dissolution extraction, solid-liquid separation and solvent recycling treatment in sequence so as to obtain a heavy dope with the extracting solvent; 2, adding a cross-linking agent into the heavy dope, stirring and mixing so as to obtain a first mixture; 3, adding a catalyst into the first mixture, heating at normal pressure to perform cross-linking polymerization so as to obtain the modified asphalt. According to the method, the modes that in the prior art, the direct liquefied coal residues are directly prepared into high-temperature asphalt firstly and subsequently heavy oil is added to perform cross-linking polymerization to modify the asphalt are abandoned, but the cross-linking agent is directly added into the heavy dope with the extracting solvent after distillation to polymerize at normal pressure so as to obtain a modified asphalt product with a low softening point and high beta resin content, and the modified asphalt is suitable for being used as middle / high-temperature binding asphalt and a raw material of dipping asphalt.

Description

technical field [0001] The invention relates to the technical field of deep processing of coal liquefaction residue, in particular to a modified asphalt, a method for continuously preparing the modified asphalt by using the direct liquefaction residue of coal under normal pressure, and an application thereof. Background technique [0002] With the rapid development of the national economy, the process of modernization and social development continues to accelerate, my country's consumption of petroleum products continues to grow, greatly exceeding the growth rate of crude oil production during the same period, resulting in an increase in our petroleum imports year by year, and has exceeded the natural Yield. However, my country is a country rich in coal and poor in oil. Making full use of abundant coal resources and developing advanced clean coal technologies such as direct coal liquefaction is one of the important ways to reduce the excessive dependence on foreign crude oil ...

AI Technical Summary

Problems solved by technology

Although these bitumen upgrading methods have been adopted by manufacturers at home and abroad, and all of them have produced qualified modified bitumen, these bitumen upgrading methods generally prepare coal direct liquefaction high-temperature bitumen from the residue of direct coal liquefaction, and then transfer it from the outside of the system to it. Add some heavy oil, cross-linking agent and other substances to carry out heating and pressure cross-linking polymerization. This method increases the complexity of the process and cannot be used for continuous production.

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