Preparation method for high-purity high-softening-point asphalt

Abstract

The invention relates to a preparation method for high-purity high-softening-point asphalt. The preparation method includes (1), adding low-QI high-purity impregnant asphalt into a stirring reaction kettle, continuously injecting air and nitrogen, stirring the asphalt, and performing air oxidation at the temperature of 180-330 DEG C for 10-30 hours; (2), adding the oxidized asphalt obtained from the step (1) into a scrapper film evaporator, and performing film distillation with the presence of nitrogen at the temperature of 320-360 DEG C under the vacuum negative pressure of 0.02MPa to remove light components to obtain the high-purity high-softening-point asphalt. The preparation method has the advantages that the softening point of the obtained high-purity high-softening-point asphalt reaches 250-300 DEG C, the coking value is larger than or equal to 75%, quinoline insoluble is less than or equal to 28%, volatiles are less than or equal to 36%, and toluene insoluble is more than or equal to 58%; impurity content is low, purity is high, production process is simple, energy conservation and environment protection are achieved, and the preparation method can be widely applied to lithium ion battery cathode material coating and carbon fiber production.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry and the technical field of novel carbon materials, and in particular relates to a production method for preparing high-purity and high-softening-point pitch. Background technique [0002] As early as the 1960s, my country has already started the research on carbon fiber, but the research is slow. At the same time, due to the technical blockade imposed on my country by developed countries, industrial production has not been possible so far, which has seriously affected my country's high-tech development. At present, the main reason that restricts the development of carbon fiber in my country is that the high softening point spinning pitch of the raw material for producing carbon fiber cannot be industrialized. [0003] High softening point asphalt is widely used due to its superior high temperature resistance. Generally, the preparation method of high softening point asphalt is comp...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to overcome the above technical problems, a production method for preparing high-purity high-softening point asphalt with reasonable design, high oxidation efficiency, uniform oxidation and low product QI value is provided. The protection solves the problems of too fast oxidation and coking in the deashing process, as well as the uniform quality of oxidized asphalt products. It has low energy consumption, simple process, and improves the yield of oxidized asphalt.