The application discloses a
tar distillation process for improving
oil quality, and relates to the technical field of
deep processing of
coal tar. The process is a
coal tar atmospheric and
vacuum distillation process for full
distillation of unwashed three-mixed oil on the top of a tar
distillation column. The core of the process is that, without changing the main structure of the original distillation equipment, four core process parameters, including
backflow, vacuum degree at the top of the column, temperature at the bottom of the column and temperature at the top of the column, are simultaneously and cooperatively controlled in the
vacuum distillation process of the tar distillation column, and the distillation
quality control thresholds of unwashed three-mixed oil and
carbon black oil are matched and set. The application solves the problems of wide process
parameter control, low and unstable product quality of the existing tar distillation process, and can make the downstream washed oil product reach the first-grade product requirement in the GB / T24217-2025 standard, while not affecting the
raw material adaptability of
carbon black oil to the downstream modified
pitch device. The application has the advantages of low modification cost, easy industrialization, stable product quality and remarkable
economic benefits.