Tecnique for producing mesothermal and modified asphaltum in intermittent single kettle type

Abstract

A method for preparing mesotherm and modified asphalt in single tower at onece time includes dewatering coal tar material to be water content less than or equal to 5%, heating hearth temperature to be 800-900 deg.C for causing negative pressure at interval tower with vacuum degree of 0.04-0.075 Pa, heating and distilling to extract out trivalent oil and anthrasol, obtaing mesotherm asphalt by cooling residue and heating mesotherm asphalt to obtain modified asphalt through cooling.

Description

technical field

[0001] The invention relates to the technology of producing asphalt from tar, in particular to the process of producing medium-temperature asphalt and modified asphalt by intermittent single-pot thermal polymerization of coal tar under negative pressure conditions. Background technique

[0002] At present, the method of producing medium-temperature asphalt adopts the intermittent single-pot process, that is, the dehydration is completed in a single vessel, the distilled fraction is extracted, and the residue in the vessel is cooled and solidified to produce medium-temperature asphalt. The traditional method has two deficiencies. First, the production cycle is long, generally 50-55 hours; second, because the furnace temperature does not meet the requirements, and the kettle is prone to coking, the medium-temperature asphalt cannot be continuously modified to produce modified asphalt in a single kettle.

[0003] At present, the production of modified asphalt ma...