Study on Reaction Behavior of Tar from Lignite Pyrolysis

Abstract

Coal tar from lignite pyrolysis is prone to react during the transportation, heating and upgrading processing, which significantly affects the yield and quality of coal tar. From the view of industry, it is of significance to study the coal tar reactivity during heating. In this paper, the effects of reaction temperature and retention time on reaction of tar were studied. It is found that the influence of the heating temperature on the tar reaction is more significant than the heating time. With the increase of reaction temperature, the yield of coke and gas significantly increased. The content of light and heavy components in the reacted tar is decreased with the increase of reaction temperature. The composition of light tar obtained from tar reaction was also affected by the reaction temperature and retention time. The content of aliphatics, aromatics and phenolics decreased with the increase of temperature. However, when the retention time was 10 s, the content of phenolic compounds increased first and then decreased with the increase of temperature, the highest content at 550°C is 3.4%, and reaches the lowest at 750°C is 0%.