Properties Of Pyrolysis Oil Research Articles

Study of the co-pyrolysis behavior and bio-oil characterization of walnut shell and polyethylene by thermogravimetric analyzer and bubbling fluidized bed

In the present work, co-pyrolysis experiments of walnut shell (WS), polyethylene (PE) and their blends were performed in the thermogravimetric analyzer and lab-scale bubbling fluidized bed reactor, to clarify co-pyrolysis behaviors, synergy interactions and pyrolysis oil properties. Besides, the HZSM-5 zeolite was used as the catalyst and its catalytic characteristics were studied. Results indicated that as PE mass ratio rose from 0 to 100 %, the initial temperature monotonically increased from 265.4 to 417.3 °C, while its terminal temperature progressively decreased from 668.3 to 527.5 °C, suggesting that the addition of PE was able to accelerate the pyrolysis of samples. The co-pyrolysis of blends was distinguished into three stages, with a negative interaction observed in the first stage and positive interactions found in second and third stages. Besides, in the bubbling fluidized bed experiments, the liquid phase product yield first elevated and then reduced with rising temperature, and a high temperature promoted the degradation of oxygen-containing compounds and enhanced aromatics generation. The synergistic interaction in the co-pyrolysis of WS and PE declined the liquid phase product yield while elevating the gas phase product yield. On the other hand, blending with PE facilitated the generation of alkanes and olefins, while inhibiting the contents of oxygen-containing components and aromatics, and simultaneously, the heavy oil fraction was increased. Finally, the carbon deposited on the surface of catalysts was amorphous carbons, and could be removed by oxidation process, whereas its catalytic properties progressively declined with rising cycle number, leading to a downtrend of aromatics and olefins and an opposite trend for oxygen-containing components.

Nghiên cứu nhiệt phân nhựa tái chế từ rác sinh hoạt để sản xuất nhiên liêu

Waste plastic originates from different sources. Currently, plastic mixed with solid municipal waste is separated for recycling and incineration. Waste plastic is derived from crude oil and can be converted into fuel by pyrolysis. This study conducted experiments on pyrolysis of plastic at 500oC, which was separated from household waste, and evaluated the properties of pyrolysis oil. Using FCC waste catalyst to improve the clouding point of pyrolysis oil products has been measured and discussed. Based on an experimental data, a process for plastic pyrolysis combination with vapor cracking unit is proposed and adapted to the infranstructure of a waste treatment plant in Central Vietnam

ANALYSIS OF OIL CHARACTERISTICS FROM PYROLYSIS OF LOW DENSITY POLYETHYLENE (LDPE) PLASTIC WASTE IN A SMALL CAPACITY REACTOR

Plastic waste in Indonesia remains a significant unresolved issue, particularly due to the extensive use of plastic bags in the food sector, industry, and other areas, which adversely affects the environment. Addressing this, one effective approach is converting plastic waste into fuel oil through the pyrolysis process. The process involves preparing pyrolysis equipment and extracting oil by conducting laboratory tests on the properties of pyrolysis oil, including Gas Chromatography-Mass Spectrometry (GCMS), Fourier Transform Infrared (FTIR) spectroscopy, and droplet combustion tests. Pyrolysis is performed by heating plastic waste at temperatures ranging from 250°C to 400°C. This study focuses on pyrolysis oil derived from Low-Density Polyethylene (LDPE) plastic, which can be used as an alternative fuel. The results show that pyrolysis oil can be ignited with sparks at a heating temperature of 300°C, exhibiting a viscosity of 1.1378 cP and a calorific value of 10,965.2 cal/g.

The Effect of Fuel Quality on Cavitation Phenomena in Common-Rail Diesel Injector—A Numerical Study

Plastic is one of the most widely used materials worldwide. The problem with plastic arises when it becomes waste, which needs to be treated. One option is to transform plastic waste into synthetic fuels, which can be used as replacements or additives for conventional fossil fuels and can contribute to more sustainable plastic waste treatment compared with landfilling and other traditional waste management processes. Thermal and catalytic pyrolysis are common processes in which synthetic fuels can be produced from plastic waste. The properties of pyrolytic oil are similar to those of fossil fuels, but different additives and plastic stabilizers can affect the quality of these synthetic fuels. The quality of fuels and the permissible particle sizes and number density are regulated by fuel standards. Particle size in fuels is also regulated by fuel filters in vehicles, which are usually designed to capture particles larger than 4 μm. Problems can arise with the number density (quantity) of particles in synthetic fuels compared to that in fossil fuels. The present work is a numerical study of how particle size and number density (quantity) influence cavitation phenomena and cavitation erosion (abrasion) in common-rail diesel injectors. The results provide more information on whether pyrolysis oil (synthetic fuel) from plastic waste can be used as a substitute for fossil fuels and whether their use can contribute to more sustainable plastic waste treatments. The results indicate that the particle size and number density slightly influence cavitation phenomena in diesel injectors and significantly influence abrasion.

Investigation of Chemical, Physical, and Tribological Properties of Pyrolysis Oil Derived from End-of-Life Tires (ELTs) against Conventional Engine Oil

Over one billion rubber tires are disposed of worldwide annually as a major component of the solid waste stream, posing a significant environmental risk. Therefore, recycling and taking advantage of the rubber component in End-of-Life Tires (ELTs) presents an advantageous opportunity to produce environmentally friendly and cost-effective products. This work studied multiple properties of oil extracted from ELTs using thermal pyrolysis (i.e., pyro-oil) as a potential candidate for industrial lubrication applications. First, pyro-oil was characterized by studying its morphological and chemical properties. Then, rheological studies were conducted to explore the oil properties at different temperatures and shear rates. A tribometer was also used to assess pyro-oil’s tribological performance at different temperatures and speeds. Finally, wettability and thermal analyses were performed to understand the wetting and thermal stability properties. The results revealed that pyro-oil has chemical properties similar to conventional engine oil with slightly higher sulfur content. Furthermore, the pyro-oil exhibited lower viscosity and lubrication performance than conventional engine oil, but this difference was smaller at higher temperatures. Thermal stability and wetting properties of pyro-oil were found to be significantly lower than those of conventional engine oil. Based on the properties found and compared with engine oil, pyro-oil presents itself as a suitable liquid lubricant for low-speed, low-load applications operating in temperatures below 61 °C. This work presents a comprehensive study of pyro-oil properties extracted from end-of-life waste tires, offering a feasible route to obtain sustainable and low-cost products.

Investigation of the effect of alumina porous media on the polyethylene waste pyrolysis with continuous feed

This study investigates the pyrolysis of polyethylene waste in a continuous-feed mode to provide novel insights into recycling waste plastics. Alumina (Al2O3) porous media has been introduced into the pyrolysis reactor to study its effect on continuous-feeding plastic waste pyrolysis. The pyrolysis product yields, oil fractions, and gas components have been determined under varying porous media structures, i.e., thickness and pore size, and operating parameters, i.e., temperature and gas-carrying velocity. To the best of our knowledge, it is the first attempt to investigate the influence of porous media pore size on the thermal decomposition of waste polyolefin in continuous feeding mode. The results reveal that higher thicknesses and smaller pore sizes of porous media can enhance the properties of pyrolysis oil with lower heavy fractions (>C20). The aromatization of light olefins is triggered when the temperature exceeds 520 °C, resulting in a rapid increase in light fraction (<C12) in pyrolysis oil. Moreover, the gas-carrying velocity determines the pyrolysis product distribution by regulating the volatiles' residence time.

OPTIMIZATION OF NATURAL CATALYSTS IN OIL PRODUCTION FROM PLASTIC WASTE PYROLYSIS

This study was conducted to determine the effect of the amount of catalyst on yield from the pyrolysis of Polypropylene (PP) type plastic waste and to determine the characteristics of plastic waste pyrolysis oil which includes the physical and chemical properties of pyrolysis oil. The physical properties tested include viscosity, fire point, flash point, pour point, density, and water content while the chemical properties are compounds contained in pyrolysis oil using Gas ChromatoChromatography -Massmetry (GCMS) and knowing its calorific value. The research was conducted on the type of High-Density Polyethylene (HDPE), namely Polypropylene (PP) which was hydrolyzed in a batch reactor using an incinerator where heating originated from outside using wood powder and LPG. The ratio of raw materials used is as much as 1 kg of plastic with a variation of zeolite catalyst 0.25; 0.5; 0.75; 1 in kg. The results showed that the more catalysts added, the more pyrolysis oil was produced. The results of measuring oil at LEMIGAS kinematic viscosity at 40oC are 1.556 cST, 42 oC fire point, PMCC 26 o C flash point, pour point -42 o C, density at 15 o C 0.7857 g / cm3, and water content is 507.54 ppm . While the hydrocarbon compounds produced are pentene, heptane, and cyclohexane which have flammable properties. The calorific value produced from this pyrolysis oil is 40.947 Mj / Kg. The maximum amount of plastic oil volume is obtained by using 1 kg of raw material with 1 kg of 955 ml zeolite catalyst.

Investigation of Pyrolysis of Walnut Shells and Pyrolysis Oil Quality

The energy demand is increasing in parallel with the technological developments and population in the world. Fossil fuels are the main source for this demand. As a result of energy production from fossil fuels, natural environment is adversely affected. Furthermore, many countries depend on the fossil fuels for their energy need. Researchers have been interested in alternative energy sources such as solar, biomass, and wind. There are many studies for investigating pyrolysis of lignocellulosic biomass. Studies mainly focused on the chemical structure of pyrolysis oil from different feedstocks. In this study, producing pyrolysis oil from walnut shells using pyrolysis reactor, investigating pyrolysis oil properties while comparing it with fossil fuels to determine if the oil can be used in internal combustion engines are investigated. The effect of pyrolysis reaction temperature on pyrolysis oil yield is studied. The results indicates that pyrolysis oil can be produced from walnut shells, the reaction temperature is an important factor on pyrolysis oil yield and pyrolysis oil has complex nature compare to fossil fuels.

Pyrolysis Oil Derived from Plastic Bottle Caps: Characterization of Combustion and Emissions in a Diesel Engine

Recycling used plastic can help reduce the amount of plastic waste generated. Existing methods, namely the process of pyrolysis, are chemical heating processes that decompose plastics in the absence of oxygen. This decomposes the plastics in a controlled environment in order to produce fuel from waste. The present study consequently investigated the physical and chemical properties of pyrolysis oil derived from plastic bottle caps (WPBCO) and the effects on the engine performance and emission characteristics of a diesel engine operating on WPBCO. The experiments were conducted with a single-cylinder diesel engine operating at a constant 1500 rpm under various engine loading conditions. The experimental results of the chemical properties of test fuels indicated that WPBCO and diesel fuels have similar functional groups and chemical components. In comparison, WPBCO has a lower kinematic viscosity, density, specific gravity, flash point, fire point, cetane index, and distillation behavior than diesel fuel. However, WPBCO has a high gross calorific value, which makes it a suitable replacement for fossil fuel. In comparison to diesel fuel, the use of WPBCO in diesel engines results in increased brake-specific fuel consumption (BSFC) and brake thermal efficiency (BTE) under all load conditions. The combustion characteristics of the engine indicate that the use of WPBCO resulted in decreased in-cylinder pressure (ICP), rate of heat release (RoHR), and combustion stability compared to diesel fuel. In addition, the combustion of WPBCO advances the start of combustion more strongly than diesel fuel. The use of WPBCO increased emissions of NOX, CO, HC, and smoke. In addition, the particulate matter (PM) analysis showed that the combustion of WPBCO generated a higher PM concentration than diesel fuel. When WPBCO was combusted, the maximum rate of soot oxidation required a lower temperature, meaning that oxidizing the soot took less energy and that it was easier to break down the soot.

Co-pyrolysis of beech wood and polyamide-6: Effect of HZSM-5 catalyst on the properties of pyrolysis oils

Biomass residues and waste can be converted into bioliquids by pyrolysis, which can contribute to both the production of renewable fuels and the recycling of waste. In this paper, the pyrolysis of pure beech wood (BW) and of a mixture of BW + polyamide-6 (PA6), a nitrogen-containing plastic, was investigated to assess the effect of PA6 on the properties of bio-oils, obtained either by thermal pyrolysis or by pyrolysis with ex-situ catalytic treatment of the vapors. The presence of 20 wt% PA6 in the blend affected the pyrolysis products yields and distribution (gases, liquids, chars), but also the composition of the bioliquids. In absence of a catalyst, the production of phenolic compounds (guaïacol, syringol…), sugars, furans decreased significantly with the BW+PA6 blend compared to pure BW, and N-containing compounds derived from PA6 were found in the bioliquids. When HZSM-5 catalyst was applied for the treatment of vapors, a beneficial effect of the catalyst on the reduction of the sugars and furans content in the bioliquids and on the production of deoxygenated compounds was observed with pure BW. This effect was mitigated with BW+PA6 blends and the formation of fully deoxygenated compounds was almost totally suppressed, suggesting that the strong catalyst acid sites were poisoned. Caprolactam was by far the main product of PA6 degradation found in the bioliquids, but the N-containing by-products were different depending on the absence or presence of HZSM-5 catalyst. In particular, the formation of 5-cyano-1-pentene in a fairly large proportion was only observed in the presence of the catalyst.

Pyrolysis of lignocellulosic biomass with high-density polyethylene to produce chemicals and bio-oil with high liquid yields

The pyrolysis of waste plastic and lignocellulosic material feedstocks increases the hydrogen/carbon ratio of the plastic-biomass mixture and may be advantageous for refining the properties of pyrolysis oil, which can be directly used as a fuel without any need for upgrading by catalytic hydrodeoxygenation. In this paper, high-density polyethylene (HDPE) and brown salwood were tested in a custom-built laboratory-scale fixed-bed reactor to investigate the co-pyrolysis reaction at temperatures ranging from 500 to 650 °C, nitrogen flow rates ranging from 40 to 160 mL min−1, and HDPE-to-biomass ratios ranging from 0.1 to 0.9. The results revealed that the temperature mostly influenced the pyrolysis products, whereas increasing the temperature to 600 °C promoted pyrolysis oil production, reaching a yield of 35.10 ± 1.20 wt%. Further increasing the reaction temperature to 650 °C decreased the yield to 34.57 ± 0.49 wt% because secondary cracking reactions produce a noncondensable gas rich in hydrocarbons. Physicochemical analysis of the pyrolyzed organic phase revealed a gross calorific heating value of up to approximately 38.19 MJ kg−1. Additionally, co-pyrolysis of HDPE improved the production of furans, and acid derivatives were obtained in the aqueous fraction via the thermal conversion of hemicellulose and lignin; conversely, the obtained char exhibited a notably low surface area and few superficial micropores and was used to further develop activated carbon for use as a catalyst in the catalytic pyrolysis of waste materials.

Effect of fractional condensation system coupled with an auger pyrolizer on bio-oil composition and properties

The effect of fractional condensation on the properties of pyrolytic oil is evaluated by assessing the number of condensation stages and temperatures used in the bio-oil recovery. By evaluating two and three condensation stages with a decreasing temperature profile, an increase in condensation efficiency of 35 % was observed when using three-condensation stages. The two fractions of bio-oil, obtained at 180 °C and 120 °C of condensing temperatures, exhibited a moisture content of 11.15 % and 23.11 % with a liquid yield of 26.1 %, 13.5 %, respectively. After a qualitative analysis, it is suggested that both oil phases could be strong candidates for their use as fuel for heating applications, or for the production of phenolic resins. Moreover, a quantitative analysis of acids and furans was performed on the third bio-oil fraction, mainly composed of water and acids. Interestingly, a majority content of butyric acid was detected, followed by acetic acid, isovaleric acid, formic acid, and propionic acid with concentrations of 93.6 g/L, 39.0 g/L, 32.0 g/L, 11.0 g/L and 9.1 g/L, respectively. Whereas furfural and HMF content quantified in the aqueous fraction reached 2.1 g/L and 1.5 g/L, respectively. Producing different acids present in this fraction appears feasible, which could have future advantages.

Effect of Temperature on Pyrolysis Oil Using High-Density Polyethylene and Polyethylene Terephthalate Sources From Mobile Pyrolysis Plant

This research aims to study the effect of temperature, collecting time, and condensers on properties of pyrolysis oil. The research was done be analyzing viscosity, density, proportion of pyrolysis products and performance of each condenser towers for the pyrolysis of high-density polyethylene (HDPE) and polyethylene terephthalate (PET) in the mobile pyrolysis plant. Results showed that the main product of HDPE resin was liquid, and the main product of PET resin was solid. Since the pyrolysis of PET results in mostly solid which blocked up the pipe, the analysis of pyrolysis oil would be from the use of HDPE as a raw material. The pyrolysis of HDPE resin in the amount of 100 kg at 400, 425, and 450°C produced the amount of oil 22.5, 27, and 40.5 L, respectively. The study found that 450°C was the temperature that gives the highest amount of pyrolysis oil in the experiment. The viscosity was in the range of 3.287–4.850 cSt. The density was in the range of 0.668–0.740 kg/L. The viscosity and density were increased according to three factors: high pyrolysis temperature, number of condensers and longer sampling time. From the distillation at temperatures below 65, 65–170, 170–250, and above 250°C, all refined products in each temperature range had the carbon number according to their boiling points. The distillation of pyrolysis oil in this experiment provided high amount of kerosene, followed by gasoline and diesel.

Bio-fuel production from Martynia annua L. seeds using slow pyrolysis reactor and its effects on diesel engine performance, combustion and emission characteristics

This research work is mainly focused on the extraction of biofuel from Martynia annua seed through a slow pyrolysis process and its utilization as an alternative fuel for the diesel engine. The various properties of biofuel were investigated and the suitability of blending with diesel was also investigated. The pyrolysis process was carried out using a fixed bed batch type reactor unit with an electrical heater after the sample has undergone a pre-treatment process. The pyrolysis process was carried out at 650 °C with a particle size of 250 μm and 3 h of reaction time. The physicochemical properties of pyrolysis oil produced were determined and reported. The produced pyrolysis oil was tested in a diesel engine at different proportions with diesel. From the experimental work, it was found that blend MAPO20 recorded the lowest BSEC at all loads among other blends and diesel. Blend MAPO20 produced the highest BTE of 30.77% which is 2.92% higher than diesel and blend MAPO40 produced BTE at par with diesel. Martynia annua seed pyrolysis oil can replace the petrodiesel up to 40% in an unmodified diesel engine without any major variation in performance and emissions.

Catalytic upgrading of biomass-derived pyrolysis vapour over metal-modified HZSM-5 into BTX: a comprehensive review

This paper provides an updated and comprehensive review on the catalytic upgrading of biomass-derived pyrolysis vapours over metal-modified HZSM-5 catalyst into bio-aromatic hydrocarbons. The catalytic upgrading of biomass pyrolysis vapours seems to be a promising technology in generating gasoline-type bio-aromatic hydrocarbons, i.e. benzene, toluene and xylene (BTX). Biomass-derived raw pyrolysis oil has high oxygenated compounds that deteriorate pyrolysis oil properties and limits its applications. Metal modification of hydrogen exchanged Zeolite Socony Mobil Five (HZSM-5) catalyst has gained attention in a biomass pyrolysis research area due to the beneficial effects on upgrading the oxygenated pyrolysis vapours into BTX-enriched pyrolysis oils. The influence of metals (alkali and alkaline earth metals, transition metals and rare earth metals) as bi-functional or multifunctional activity on HZSM-5 catalyst during pyrolysis has been addressed. The effect of reaction temperature, the type of metals, metal contents, the silica-to-alumina ratio of catalyst and the catalyst-to-biomass ratio are critically discussed for maximum production of monocyclic aromatic hydrocarbons during the upgrading of pyrolysis vapours. Finally, concluding remarks on metal-modified zeolite catalyst and future recommendation in upgrading biomass pyrolysis vapours are presented.

Vacuum Pyrolysis of Waste Vehicle Tyres into Oil Fuel Using A Locally, Fabricated Reactor

Abstract&#x0D; Some countries still face daunting challenges of managing ever-increasing waste generated, especially plastic and waste vehicle tyres. Whilst some developed countries have adopted innovative ways such as catalytic or pyrolytic decomposition processes for energy or fuel generation from these wastes, developing countries like Ghana still dispose off indiscriminately around communities or un-engineered dumpsites. Hence, this study sought to transform waste vehicle tyres into fuel which invariably minimises or eliminates its environmental impact. Particularly, waste vehicle tyres (sourced from dumpsites in Tarkwa, Ghana) were washed, shredded and decomposed via pyrolysis at high temperature range (~ 450 - 650 oC) using locally designed and fabricated reactor. The physicochemical properties (such as water content, flashpoint, density, sulphur content, solids and viscosity) of the pyrolysis oil produced were also examined using the American Society for Testing and Materials (ASTM) standards and procedures. The results showed that the viscosity, flashpoint and the density of the pyrolysis oil produced were 0.904 cSt, 34.5 oC, and 850.6 kg/m3 (at 15 oC), respectively. The sulphur, water and solids/particulates contents were 4340.0 ppm, 0.8 vol.%, and 483,495.5 ppm, respectively. It was also observed that the pyrolysis oil obtained appeared as thick, single-phase liquid with dark colour and strong odour at room temperature. Relatively, the properties of pyrolysis oil produced without further treatment did not meet the International specification for diesel fuel, hence its usage would require further treatments such as desulphurisation, decanting, centrifugation and filtration. Overall, the study has demonstrated that the pyrolysis of waste vehicle tyres into fuel provides an alternative method for managing end-of-life vehicle tyres and adding value to waste in general.&#x0D; &#x0D; Keywords: Pyrolysis, Waste Vehicle Tyres, Reactor, Pyrolysis Oil, Biofuel

Pyrolysis of torrefied biomass: Optimization of process parameters using response surface methodology, characterization, and comparison of properties of pyrolysis oil from raw biomass

Pyrolysis of torrefied Acacia nilotica was investigated in a tubular fixed-bed reactor under nitrogen environment. The process was optimized using response surface methodology coupled with central composite design, in order to obtain the maximum yield of pyrolysis oil. The maximum yield of pyrolysis oil (33.59 wt %) was obtained at 507.04 °C, retention time of 58.25 min, heating rate of 38.00 °C/min, and sweeping gas flow rate of 40.52 mL/min. Analysis of variance confirmed that pyrolysis of torrefied biomass for maximum pyrolysis oil yield highly depended on temperature followed by heating rate, retention time, and sweeping gas flow rate, respectively. Pyrolysis of raw biomass was also carried out at the optimum condition for comparing the quality of both pyrolysis oils. The pyrolysis oil samples were subjected to FTIR, GC-MS, and 13C NMR analyses along with estimation of water content, pH, viscosity, HHV, etc., for comparing the physicochemical characteristics. Results showed that total aromatic carbon, carbonyl carbon, and primary alkyl carbon of pyrolysis oil from torrefied biomass increased by 40.28, 51.36, and 6.34%, respectively, as compared to pyrolysis oil from raw biomass. The phenol derivative compounds are increased by 18.91%. The HHV and pH of pyrolysis oil from torrefied biomass increased by 23.53, 42.15%, respectively, while water content decreased by 34.37% as compared to pyrolysis oil from raw biomass. Thus, with rapid advancement in pyrolysis process, the integrated approach of torrefaction-pyrolysis process may be beneficial to produce cleaner pyrolysis oil as compare to raw biomass.

Tyre Pyrolysis Oil Properties and their Effect on Diesel Engine Performance, Emission and Combustion Characteristics: A review

Tyre Pyrolysis Oil Properties and their Effect on Diesel Engine Performance, Emission and Combustion Characteristics: A review

Conversion of Loblolly pine biomass residues to bio-oil in a two-step process: Fast pyrolysis in the presence of zeolite and catalytic hydrogenation

In the present study, Loblolly pine biomass residue was converted to bio-oil in a two-step process, consisting of 1) fast pyrolysis in the presence of zeolite ZSM-5 as a catalyst to produce pyrolysis oil, 2) hydrogenation of pyrolysis oil using formic acid as the hydrogen source in presence of Ru/activated carbon catalyst. Pyrolysis oils were analyzed by 13C, 31P and HSQC-NMR and the results revealed that the zeolite-induced catalytic fast pyrolysis process led to effective demethoxylation, producing more catechol and p-hydroxy-phenyl hydroxyl groups in the bio-oils, resulting in a decrease in the methoxyl group content by about 85 % and rich aromatic structures in the pyrolysis oils. The properties of pyrolysis oil with and without zeolite were in the bio-oil range. Hydrogenated pyrolysis oil showed that 79 % of the aromatic protons are eliminated and 87 % of protons are aliphatic in nature, with no oxygen attached to the α-carbon.

Experimental investigation to identify the type of waste plastic pyrolysis oil suitable for conversion to diesel engine fuel

Plastics for various applications is increasing every year due to outstanding advantages, but after use recycling and disposal have remained a challenge. In this paper, through experiments, we compare properties of pyrolysis oil derived from after use HDPE (High-density polyethylene), LDPE (Low-density polyethylene), PP (Polypropylene)and styrene for their suitability as diesel engine fuel. This experimental study is to identify which type of plastic is suitable for blending with diesel. The physicochemical properties of pyrolysis oil of HDPE, LDPE, PP, and styrene were tested, tabulated and compared with diesel. The physicochemical properties of polypropylene pyrolysis oil (PPO) were found to be superior to the produced pyrolysis oil of HDPE, LDPE, and styrene. The GC-MS(Gas chromatography-mass spectrometry)and FT-IR (Fourier transform-infrared spectroscopy) were taken for pyrolysis oil of HDPE, LDPE, PP, and styrene and compared with diesel. PPO showed lower carbon number chain compounds compared to the other three waste plastics. We selected PPO for diesel engine performance and emission trials based on the results of the above tests. PPO was blended in the ratios of 5%, 10% and 15% with diesel. Combustion analysis showed a increase in cylinder pressure in comparison to diesel values. The heat release rates (HRR) were sharply higher than diesel. Both cylinder pressure and HRRvalues for PPO increased as the blend ratios increased. The emission results showed an increase in carbon monoxide (CO), hydrocarbon (HC)and oxides of Nitrogen (NO x )emissions. The multiple times increase in emissions is due to the presence of unsaturated hydrocarbons and higher carbon number of saturated compounds in PPO. GC-MS tests confirmed the presence of such compounds in PPO. To reduce the unsaturation to negligible levels, we will take up future experiments in hydrogenating PPO with various catalysts and test the performance and emissions in diesel engines. The experiment and analysis plan for conversion of solid waste plastics to diesel fuel. • Four types of plastics selected to determine which plastic has a diesel like quality. • Physicochemical properties, FTIR, GCMS results showed Polypropylene had diesel like qualities. • Diesel Engine trials done with polypropylene pyrolysis oil blended with diesel as fuel. • Engine trial results showed delayed combustion, high heat release rate and higher emission.