Evaluation of pyrolysis process parameters on polypropylene degradation products

2014 ◽  
Vol 109 ◽  
pp. 272-277 ◽  
Author(s):  
Mehrdad Seifali Abbas-Abadi ◽  
Mehdi Nekoomanesh Haghighi ◽  
Hamid Yeganeh ◽  
Armando G. McDonald
2008 ◽  
Vol 368-372 ◽  
pp. 1044-1046 ◽  
Author(s):  
Yang Wei Lu ◽  
Yu Di Zhang ◽  
Hai Feng Hu ◽  
Chang Rui Zhang

A novel, online-joining of C/SiC-C/SiC method, precursor infiltration and pyrolysis, was used to obtain high temperature stable joining SiC composition, while joining process was highly consistent with C/SiC preparation process. The compositions of joining ingredients and process parameters were investigated to determine the maximum joining strength of C/SiC-C/SiC at room and high temperatures. The optimum weight ratio of (polycarbosilane/divinyl benzene)/SiC powder is 3/1, and ramping rate of pyrolysis is 2°C/min, and cycles of infiltration and pyrolysis is 6. The flexural strengths of joining components remained stable up to 1200°C (50.8MPa), but decreased to 30.5MPa at 1500°C, while the tensile strengths remained rather stable (20.5MPa) up to 1500°C, and decreased to 8.4MPa at 1800°C.


Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3094
Author(s):  
Daria Frączak ◽  
Grażyna Fabiś ◽  
Beata Orlińska

Chemical recycling of polymers can lead to many different products and play a significant role in the circular economy through the use of plastic waste as a feedstock in the production of valuable materials. The polyolefins: polyethylene (PE) and polypropylene (PP), together with polystyrene (PS), can be chemically recycled by the thermal cracking (pyrolysis) process. In this study, continuous cracking of polyolefins and polystyrene in different proportions and with the addition of other polymers, like polyethylene terephthalate (PET) and polyvinyl chloride (PVC), was investigated at the pilot scale in terms of the process parameters and product yields. Gas chromatography with mass spectrometry (GC-MS) was used for the detailed analysis of the products’ compositions. The boiling temperature distribution and the bromine number were used for additional characterization of products. It was found that an increase of PP share caused a decrease in the process temperature, an increase of the product yield and a shift of the boiling range towards lighter products, increasing the content levels for unsaturates and branched hydrocarbons. It was observed that the addition of 5% PS, PET and PVC reduced the overall product yield, resulting in the creation of a lower-boiling product and increasing the conversion of polyethylene. An addition of 10% polystyrene increased the PP conversion and resulted in a higher product yield, without significant change in the boiling temperatures distribution.


2016 ◽  
Vol 20 (4) ◽  
pp. 1209-1222 ◽  
Author(s):  
Petar Gvero ◽  
Sasa Papuga ◽  
Indir Mujanic ◽  
Srdjan Vaskovic

Biomass is a fuel with a highly volatile content and due to that, pyrolysis as a part of the combustion process, has a dominant role in the overall process development, as well as on final products and the process efficiency. It is of key importance to investigate the influence of the process parameters; as temperature, furnace/reactor environment, fuel properties, type, particle size, geometry, and the structure of the pyrolysis process has an influence regards the design of the combustion/pyrolysis equipment and the final products of the processes. This paper gives some results of the investigation?s related to this problem, mainly focussing on wooden biomass as the most important biomass type, as well as a comparison with relevant documented literature. Besides that, pyrolysis based technologies are one of the key directions in synthetic fuels production based on biomass. Biomass pyrolysis process parameters are crucial in reactor design as well as the quantity and quality of the final products. This paper provides discussion dedicated to this aspect with a focus on slow pyrolysis, targeting charcoal as the key product, and fast pyrolysis, targeting synthetic gas as the key product.


2020 ◽  
Vol 132 ◽  
pp. 105412 ◽  
Author(s):  
Fábio Roberto Vieira ◽  
Carlos M. Romero Luna ◽  
Gretta L.A.F. Arce ◽  
Ivonete Ávila

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