Effect of hot char and steam on products in waste tire pressurized pyrolysis process

In this paper, the pressurized pyrolysis of side wall rubber (SWR), integrated with pressurized in-line catalytic cracking and catalytic steam reforming over hot in-situ char, was studied. The influence of three factors (pressure, pressurized hot char and Water/SWR ratio) on the product distribution of SWR pyrolysis was evaluated. High activity and selectivity of pressurized SWR hot char were characterized. The results showed that the yield of pyrolysis gas decreased with pressure increase. The content of CH₄ in syngas could reach 60 vol% in the pressurized in-line cracking process. C₂-C₃ in syngas could reach 40 vol% in the pressurized pyrolysis. In the pressurized catalytic steam reforming process, the content and low heating value (LHV) of syngas reached 17.34 vol% and 6.84 kJ/g with a 25.0% Water/SWR ratio, respectively. The yield of single ring aromatics increased from 11.7% to 47.1% after pressurized pyrolysis at 0.1–2.0 MPa. After in-line steam reforming, the concentration of oxygenates in oil was far lower than that of in pressurized pyrolysis oil. The moisture content in oil was only 0.39 wt% after in-line catalytic cracking at 1.0 MPa.