Abstract
A new approach to solving the problem of lowering the hazard class and utilization of large-tonnage industrial waste, acid tar, is proposed. The possibilities of its processing, depending on the ratio of reagents, into bituminous products or solid composites are considered. The proposed two-stage method is based on chemical reactions ending with the ionic bonding of volatile low-molecular toxic components of acid tars upon neutralization of acids with amines with following formation of the covalent bonds upon the introduction of a crosslinking agent. The features of both stages have been studied. It was shown that acid tar is completely neutralized in excess of organic amine. The neutralization product retains the viscous fluidity of tar and has the thermophysical and viscous properties of certain brands of bitumen, which is unattainable with use of inorganic reagents. At the next stage, with the introduction of an epoxy resin as a crosslinking agent, excess amine is consumed, and a three-dimensional polymer network is formed in the tar mass. Elastic or solid product is formed, depending on the amount of resin. Polymer network completely impedes the migration of toxic components of acid tar into the environment. Contrary to the known processes, the studied process uses simple equipment and is characterized by low power consumption.
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Fedoseeva, E.N., Zanozina, V.F. Utilization of Acid Tar with Use of Amines. Russ J Appl Chem 93, 1750–1757 (2020). https://doi.org/10.1134/S1070427220110178
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DOI: https://doi.org/10.1134/S1070427220110178