Pyrolysis of a ZnCI2-impregnated coal in an inert atmosphere

✍ Scribed by Rafael Kandiyoti; John I. Lazaridis; Bo Dyrvold; C.Ravindra Weerasinghe

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 569 KB
• Volume: 63
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(84)90231-x

✦ Synopsis

Untreated and ZnCI,-impregnated samples of Linby bituminous coal were pyrolysed at atmospheric pressure in a Gray-King retort and a quartz fluidized bed. It was confirmed in the Gray-King retort that in the absence of externally added hydrogen, and at slow heating rates (several degrees per minute), the effect of impregnating ZnCI, is to increase the char yield and to suppress tar production. It was found that this trend can be reversed by flash-pyrolysing the ZnCI,-impregnated samples. Tar yields as high as 35% (at 10% ZnCI, loading) were observed at 582"C, compared to 22% tar from the untreated coal. This reversal of the product distribution trend is seen to be caused solely by the increase in heating rates, and not by the difference between the geometries of the equipment.