Department of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India.
Department of Chemical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, India.
Waste Manag. 2018 Jul;77:114-130. doi: 10.1016/j.wasman.2018.05.013. Epub 2018 May 12.
The valuable aromatics benzene, toluene, ethyl benzene and xylene (BTEX) were effectively produced from waste polyethylene (PE) using fly ash synthesized catalyst. The BTEX yield was enhanced significantly using multiphase catalytic pyrolysis of polyethylene. Low cost natural catalyst was synthesized from fly ash (FA) in 5 different synthesized form i.e., fly ash in natural form (FAN), fly ash calcined at 600 °C (FA-600), 700 °C (FA-700), 800 °C (FA-800) and 900 °C (FA-900). The thermal and catalytic pyrolysis both were conducted in a specially designed semi-batch reactor at the temperature range of 500-800 °C. Catalytic pyrolysis were performed in two different phases within the reactor batch by batch systematically, keeping the catalyst in a liquid phase (A-Type) and liquid and vapor phase/multiphase (B-Type), respectively. The maximum liquid yield of 78.20 wt% was obtained at a temperature of 700 °C using FA-800 catalyst in A-type arrangement. Total aromatics (BTEX) of 10.92 wt% was obtained for thermal pyrolysis at a temperature of 700 °C. In contrary, the aromatic (BTEX) contents were significantly increased for the catalytic pyrolysis in both reactor arrangement A and B types, nearly doubled from 10.92 wt% (thermal pyrolysis) to 21.34 wt% for A-type and 22.12 wt% for B type/multiphase. The pyrolysis oil was characterized using GC-FID, carbon residue test and other fuel testing methods to evaluate the suitability of its end use and aromatic content.
采用粉煤灰合成催化剂，从废聚乙烯（PE）中有效制取有价值的芳烃苯、甲苯、乙苯和二甲苯（BTEX）。通过多相催化热解聚乙烯，显著提高了 BTEX 的产率。以粉煤灰（FA）为原料，采用 5 种不同的合成方法合成了低成本的天然催化剂，即原状粉煤灰（FAN）、在 600°C（FA-600）、700°C（FA-700）、800°C（FA-800）和 900°C（FA-900）下煅烧的粉煤灰。在专门设计的半间歇式反应器中，在 500-800°C 的温度范围内进行热解和催化热解。在反应器分批中，通过分批系统地在两个不同的相中进行催化热解，分别使催化剂处于液相（A 型）和液-汽相/多相（B 型）。在 A 型布置中，使用 FA-800 催化剂在 700°C 时获得了最大的液体产率 78.20wt%。在 700°C 时，热解得到了总芳烃（BTEX）的 10.92wt%。相反，在两种反应器布置 A 和 B 型的催化热解中，芳烃（BTEX）的含量显著增加，从热解的 10.92wt%（热解）分别增加到 A 型的 21.34wt%和 B 型/多相的 22.12wt%。使用 GC-FID、残碳试验和其他燃料测试方法对热解油进行了表征，以评估其最终用途和芳烃含量的适宜性。
