Preparation method of high softening point asphalt

Abstract

The invention provides a preparation method of high softening point asphalt, and the method comprises: heating an asphalt raw material to a molten state, subjecting the asphalt raw material, reaction additives accounting for 0.01%-5% of the total mass of the asphalt raw material, as well as air to full premixing reaction, with the mixing temperature controlled at 80-180DEG C and the mixing time controlled at 1min-40min; then introducing the mixture to an oxidation reactor for air blowing oxidation at a temperature of 200-340DEG C for 3-10h, with the air blowing rate of an oxidation tower maintained at 0.05-0.5m<3>.kg<-1>.h<-1>, thus obtaining a high softening point asphalt product with excellent high temperature performance and temperature susceptibility resistance. The method of the invention solves the problems of overlong reaction time, nonuniform air distribution, easy coking, short oxidation tower operation cycle, and poor product performance, etc. existing in current high softening point asphalt production processes by oxidation method.

Description

technical field

[0001] The invention relates to a preparation method of high softening point asphalt, in particular to a preparation method of asphalt which improves the high-temperature stability of asphalt and resists temperature sensitivity by a premixed catalytic oxidation method. Background technique

[0002] High softening point asphalt refers to asphalt with a softening point above 100°C, especially above 120°C. High softening point asphalt is widely used because of its excellent high temperature resistance. If it is used as a roof covering for building a house, it will not become very soft or even runny even in the hot summer. It can also be used in drilling operations in deep oil and gas fields. As an important part of drilling fluid, it can play a role in plugging, preventing collapse, stabilizing the well wall and reducing rate loss under high temperature conditions. In addition, it can also be used as a modification additive for polymer materials, etc. [0003...

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