PERFORMANCE PROPERTIES OF MARINE FUEL DERIVED FROM SECONDARY POLYMER RAW MATERIALS

Abstract

The article substantiates the need to determine the operational properties of shipping fuel obtained from secondary polyolefin (HDPE and PP) raw materials by catalytic pyrolysis. It is proposed to evaluate the operational properties of fuel for shipping – marine gasoil (MGO) by the value of the cetane index (CI, unit), H:C ratio, working heat of combustion (Q, MJ/kg). In view of the scheme of catalytic pyrolysis of polymeric raw materials proposed by us, which consists of two stages (I stage - the course of reactions on a mixture (1:1) of zeolitecontaining catalysts Zn-H-ZSM-5/Fe-H-ZSM-5; II stage – the course of reactions on the NiH-ZSM-5 catalyst), it is necessary to determine after each stage of the process the quality indicators of the reaction products (fractions with boiling points of -360(380) °С) given above. Also, additionally, we determined the quality indicators for the fractions obtained on the H-ZSM-5 industrial catalyst. The proposed research program, on the one hand, allows to determine the efficiency of the pyrolysis process with the selected catalysts in comparison with industrial technology, on the other hand, it will allow to adjust the process in the direction of obtaining a final product of a quality level that meets the requirements for MGO presented in ISO 8217:2017. The conducted studies showed that by the value of CI (48-50 units) and ν 40 (2,8–3,1 mm²/s) the fractions with boiling points of 180–360(380) °С, which were obtained by pyrolysis of polymer raw materials according to the two-stage technology proposed by us (on Zn-H-ZSM-catalysts 5/Fe-H-ZSM-5, Ni-H-ZSM-5) can be attributed to the brands of distillate marine fuels DMA, DFA, DMZ, DFZ (ISO 8217:2017). These fractions are also characterized by a high Н:C ratio (for HDPE – 1.62; for PP – 1.64) and working heat of combustion (for HDPE – 44.0 MJ/kg; for PP – 44.3 MJ/kg), which makes it possible to use them as fuels for shipping.