
Mehrdad Seifali Abbas‐Abadi
Mehrdad Seifali Abbas‐Abadi
Doctor of Philosophy
I want to be a researcher
About
50
Publications
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Introduction
Plastic Characterization, Plastic Processing, Extrusion, Renewable Energies, Chemical Recycling
Education
December 2020 - December 2023
Publications
Publications (50)
In this work, the chemical preparation of activated carbon (AC) using walnut shell (WS) and plastic wastes (primarily consisting of polyethylene, polypropylene, and polystyrene) as feedstocks and chemical activators (KOH and NaOH) was investigated in a fixed-bed reactor. Thermogravimetric analysis (TG) (TGA) was used to carbonize WS together with p...
Due to the complexity and diversity of polyolefinic plastic waste streams and the inherent non-selective nature of the pyrolysis chemistry, the chemical decomposition of plastic waste is still not fully understood. Accurate data of feedstock and products that also consider impurities is, in this context, quite scarce. Therefore this work focuses on...
The catalytic upgrading of post-consumer mixed polyolefinic waste pyrolysis vapors has been studied over five different solid acid catalysts to understand the effect of vapor-catalyst contact time and catalyst properties on the recovery of light olefins (C2-C4). HZSM-5 with Si/Al ratio of 11 and 27 produced the highest light olefins yields (83.4 wt...
Despite the undeniable interest presented by biofuels, their combustion processes are likely to modify the formation of aromatic species, especially oxygenated aromatics, that may profoundly modify the properties of the formed soot particles. However, the kinetics of oxygenated aromatics are not well studied yet. In this work, a laminar premixed fl...
End-of-life tires are discarded on a daily basis but even at present limited action has been taken towards boosting their recyclability as most of the tires are either incinerated or landfilled/stockpiled. The complexity of tires has also been drastically increased, with little attention to designing them specifically for recycling. The retreading...
Industrial-scale application of end-of-life plastic pyrolysis still faces significant problems, such as a lack of detailed knowledge on degradation mechanisms, parameters affecting the degradation, and formation pathways of the primary pyrolysis products. Today, the degradation mechanisms based on radical chain scission are insufficiently understoo...
The catalysts available in the HDPE production plant are usually from the second and third generations of Ziegler Natta catalysts. The activity of this group of catalysts is low and more catalysts are needed to produce a certain amount of heavy polyethylene compared to newer generations of these catalysts.
In this study, the combination of chlorocy...
Pyrolysis of plastic packaging waste yields a liquid product that can be processed in steam crackers producing light olefins and hence closing the loop towards new virgin plastics. However, there is a lack of knowledge on how the plastic waste composition affects the pyrolysis oil quality regarding hydrocarbon composition and contaminant concentrat...
Catalytic fast pyrolysis of polyolefinic waste streams was investigated to recover valuable base chemicals at high selectivity. HZSM-5 zeolite with different properties, affected by Si/Al, mesoporosity, phosphorus stabilization, and steaming, were tested and thoroughly characterized. Different feeds, catalyst/feed ratios and reaction temperatures w...
Chemical recycling of plastic waste via thermochemical processes is essential to move to a carbo-circular economy, reducing our dependence of fossil resources . However, recovering monomers from polyolefins in one or multiple steps is challenging due to their chemical inertness. In the present work, a tandem micro-pyrolyzer coupled to comprehensive...
In this study, the simultaneous effect of cyclohexyl chloride (CHC) as a high-performance promoter and different electron donors (ED) on ethylene polymerization was studied. The polymerization reactions were carried out using Mg (OEt)2/ TiCl4/ TEAl Ziegler-Natta catalyst system. The results showed that CHC and ED, like methanol and diethyl ether (D...
The pyrolysis of Iranian oak wood and waste plastics has been studied under different oak/plastic ratios and using different zeolite based catalysts. Pyrolysis of oak/plastics using a fixed bed reactor, resulted in the production of a liquid with a high oxygen content. The resulting organic liquids were re-pyrolyzed and deoxygenated using the zeoli...
The effect of the initial cross-link, as well as process parameters, such as heating rate and temperature, was investigated on the pyrolysis of poly butadiene rubber (PBR) using a semi-batch stirred reactor and a TG equipment. To better evaluate the degradation mechanisms of polybutadiene rubber, the degradation of polyvinyl chloride was also inves...
Based on the promising results of La2O3- and CeO2-promoted Ni/Al2O3 catalysts in the reforming of biomass pyrolysis volatiles, the performance of these catalysts and the non-promoted one was evaluated in the pyrolysis and in-line steam reforming of polypropylene (PP). The experiments were carried out in a continuous bench scale pyrolysis-reforming...
In this work, the effects of different process parameters were investigated on the performance of TiCl4/internal donor/MgCl2/AlEt3 catalytic system and produced polyethylene in a semi-batch stirred reactor. Various methods such as Brunauer–Emmett–Teller (BET) surface area analysis, scanning electron microscope (SEM), sieve shaker and melt flow inde...
Restrictions on fossil fuel supplies, energy crisis issues and environmental problems caused by fossil fuel consumption in recent years have led to the development and utilization of renewable energies such as biomass. In this paper, using a fixed bed reactor, effect of Polymer Addition on Catalytic Pyrolysis Products of Iranian Oak is investigated...
Many studies have been done on the stability, thermo-mechanical degradation and pyrolysis of polymers with hydrocarbon skeleton. According to the main structure, side groups, with and without double bond in the structure, polymer has different responses in reference to the thermo-mechanical and thermal degradations. The polymers in extruder are fac...
The atmospheric, vacuum and pressurized pyrolysis of oil-rich bleached soil with polymeric wastes was investigated using a semi batch stirred reactor. Also, the gas chromatograph mass spectrometry (GC/MS) instrument was used to measure the hydrocarbon components containing paraffin, olefin, naphtehene and aromatic (PONA) and carbon number of the li...
Pyrolysis of Iranian oak has been investigated under different temperatures, heating rates, particle sizes, carrier
gases, and zeolite-based catalysts. A semi-batch fixed bed reactor and thermogravimetric analyzer (TGA) were used to carry out
the pyrolysis experiments simultaneously. The varied components of the produced organic liquids were measur...
Pyrolysis of high impact polystyrene (HIPS) waste has been investigated under different process parameters, such as temperature, heating rate and types of zeolitic catalysts to produce valuable liquid products. Liquid, gas and coke as products of pyrolysis and aromatic, naphthene, olefin and paraffin as liquid components were obtained and their mol...
The pyrolysis products as well as composition of the condensed products generated from Styrene Butadiene
Rubber (SBR) degradation have been investigated with reference to different zeolite based catalysts. The effects of different
catalysts containing used FCC, gallium promoted used FCC (Ga/FCC), HZSM-5, and mordenite have been studied on the SBR
d...
In this study, the effects of different zeolite based catalysts, initial crosslinking, temperature and heating rate as key process and structural parameters on the thermal degradation of natural rubber (NR) were investigated. The product composition containing liquid, gas and coke yield as well as the varied components of liquid product as a functi...
In the previous studies, the several halocarbons (HC) were tested as promoters for a Ti-based Ziegler–Natta (ZN) catalyst at different polymerization conditions. The Results showed that chloro cyclohexane has the best operation in catalyst activity, polymer particle size growth, hydrogen responsibility and wax reduction too. For the first time in t...
The pyrolysis products as well as composition of the condensed products generated from Styrene Butadiene Rubber (SBR) degradation have been investigated with reference to different zeolite based catalysts. The effects of different catalysts containing used FCC, Gallium promoted used FCC (Ga/FCC), HZSM-5 and mordenite have been studied on the SBR de...
In this semi batch pyrolysis study, the effect of different zeolite catalysts containing used FCC, HZSM-5 and mordenite on the degradation of virgin poly butadiene (PBR) were considered. The liquid, gas and coke yield as well as composition of liquid product as a function of different catalysts effect in the stirred reactor were compared. Main prod...
Pyrolysis of low density polyethylene (LDPE) by equilibrium fluid catalytic cracking (FCC) was studied in a stirred reactor under different process parameters. In this work, the effect of process parameters such as degradation temperature (420-510°C), catalyst/polymer ratio (0-60%), carrier gas type (H2, N2, ethylene, propylene, Ar and He), residen...
Pyrolysis of polypropylene (PP) with an equilibrium fluid catalytic cracking (FCC) catalyst in a stirred reactor was studied to produce “fuel like” hydrocarbons. The effect of process parameters such as degradation temperature, catalyst/polymer ratio (%), carrier gas type and stirrer rate on the condensed product yield and composition were determin...
The powder of EX5 grade of high density polyethylene—without any additives—manufactured by Amirkabir petrochemical company was separated by shaker equipment. The separated powder of average diameter ~25, ~62.5, ~87.5, ~112.5, ~137.5, ~175 and the particles >200 μm was tested by a thermogravimetric (TG) analysis instrument in nitrogen atmosphere and...
The yield as well as molecular weight and composition of the condensed product generated from the HDPE was studied to gain insight into the role of temperature, equilibrium FCC catalyst, agitator speed and carrier gas on the pyrolysis products. Pyrolysis was done in a suite stirred bucchi stainless-steel autoclave reactor. The effect of process par...
In this study, several polyolefins, including different grades of polypropylene (PP), high‐density polyethylene, linear low‐density polyethylene, and low‐density polyethylene, were tested by thermogravimetric analysis (TGA), and the relationships of their melt flow index (MFI) and melt flow ratio (MFR) values to the thermogravimetry (TG) curves, di...
The pyrolysis of linear low density polyethylene (LLDPE) by used fluid catalytic cracking (FCC) catalyst was studied in a stirred reactor to reach the appropriate transportation hydrocarbons. In this work, the effect of process parameters such as degradation temperature, catalyst/polymer ratio (%), carrier gas type and stirring rate on the condense...
Several organohalide (HC) compounds were tested as promoters for a Ti-based Ziegler-Natta (Z-N) catalyst at different polymerization conditions. Results show that the intensity of the promoting effect depends on the nature and amount of the promoters. A proper amount, especially optimum amount, of aliphatic type organohalides leads to a strong prod...
In our previous study we found that addition of proper amount of halocarbons (HC) including chlorocyclohexane (CHC), chlorocyclopentane (CHP), butylchloride (BC), 1,4-dichlorobutane (DCB), and chloroform (C) to the MgCl2 (Ethoxide type)/TiCl4/AlEt3 catalytic system leads to a strong productivity improvement. In this study, the effect of these haloc...