Abstract: In view of the high contents of metal, particulate matter and aromatic hydrocarbon in full range mid-low temperature coal tar, the combined technology of low-pressure pretreatment-fixed bed hydrogenation was developed. The results of pilot plant indicated that the clean diesel fraction with sulfur content less than 20 μg/g could be produced by the combined process using mid-low temperature coal tar as raw material, at the same time, the by-product naphtha with the sulfur less than 0.5 μg/g, the nitrogen less than 0.5 μg/g, and the aromatic potential content(w) more than 70% could be used as excellent reformer feed. The hygro-upgrading technology of full fraction of mid-low temperature coal tar had the characteristics of low investment, simple process, and high liquid yield and good product quality.It provides the technical support for the clean and efficient utilization of coal in China.

Key words: coal tar, full fraction, low-pressure pretreatment, hydrogenation, clean diesel