Orozco Santiago, Artetxe Maite, Lopez Gartzen, Suarez Mayra, Bilbao Javier, Olazar Martin
Department of Chemical Engineering, University of the Basque Country UPV/EHU, P.O. Box 644, 48080, Bilbao, Spain.
IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.
ChemSusChem. 2021 Oct 5;14(19):4291-4300. doi: 10.1002/cssc.202100889. Epub 2021 Jun 22.
Continuous catalytic cracking of polyethylene over a spent fluid catalytic cracking (FCC) catalyst was studied in a conical spouted bed reactor (CSBR) with fountain confiner and draft tube. The effect of temperature (475-600 °C) and space-time (7-45 g min g ) on product distribution was analyzed. The CSBR allows operating with continuous plastic feed without defluidization problems and is especially suitable for catalytic pyrolysis with high catalyst efficiency. Thus, high catalyst activity was observed, with waxes yield being negligible above 550 °C. The main product fraction obtained in the catalytic cracking was made up of C -C hydrocarbons, with olefins being the main components. However, its yield decreased as temperature and residence time were increased, which was due to reactions involving cracking, hydrogen transfer, cyclization, and aromatization, leading to light hydrocarbons, paraffins, and aromatics. The proposed strategy is of great environmental relevance, as plastics are recycled using an industrial waste (spent FCC catalyst).
在带有喷泉限流器和导流管的锥形喷动床反应器（CSBR）中，研究了废流化催化裂化（FCC）催化剂上聚乙烯的连续催化裂化。分析了温度（475 - 600 °C）和时空（7 - 45 g min g ）对产物分布的影响。CSBR能够在不出现流化不良问题的情况下连续进料塑料，特别适用于具有高催化剂效率的催化热解。因此，观察到催化剂活性较高，在550 °C以上蜡的产率可忽略不计。催化裂化得到的主要产物馏分由C - C烃组成，烯烃是主要成分。然而，随着温度和停留时间的增加，其产率下降，这是由于涉及裂化、氢转移、环化和芳构化的反应导致生成轻质烃、石蜡和芳烃。所提出的策略具有重大的环境意义，因为塑料是利用工业废料（废FCC催化剂）进行回收的。
