Brown coal tar hydrotreatment

The paper deals with the outcomes of laboratory experiments concerning brown coal tar hydrotreatment, in which tar was a by-product of brown coal pyrolysis. The experiments were carried out in pressure reactor at 300 °C and at varied operational pressures of hydrogen used as hydrotreatment medium. The brown coal tar samples earmarked for the hydrotreatment tests had been prepared through pyrolysis of samples of brown coal, in which samples represented, in terms of qualitative parameters, the brown coal types to be found in individual districts of the North Bohemian Coal Basin. During the experiments the qualitative parameters were determined both of the feed material (brown coal tar) and of the products generated (gaseous, water and organic phases and the hydrotreatment residue). The yields of these products as per on the operational hydrogen pressure used during the hydrotreatment process were also determined.