Polyethylene Terephthalate Chemical Recycling in the Melted State

2007 ◽  
Vol 46 (7) ◽  
pp. 695-701 ◽  
Author(s):  
Vitali T. Lipik ◽  
Marc J. M. Abadie
Keyword(s):  
Polyethylene Terephthalate ◽  
Chemical Recycling

scholarly journals Engineering Microbes to Bio-Upcycle Polyethylene Terephthalate

2021 ◽  
Vol 9 ◽  
Author(s):  
Lakshika Dissanayake ◽  
Lahiru N. Jayakody
Keyword(s):  
Polyethylene Terephthalate ◽  
Metabolic Pathways ◽  
Aquatic Ecosystems ◽  
Value Added ◽  
Building Blocks ◽  
Chemical Recycling ◽  
Plastic Pollution ◽  
Microbial Cell Factories ◽  
Cell Factories ◽  
Value Added Products

Polyethylene terephthalate (PET) is globally the largest produced aromatic polyester with an annual production exceeding 50 million metric tons. PET can be mechanically and chemically recycled; however, the extra costs in chemical recycling are not justified when converting PET back to the original polymer, which leads to less than 30% of PET produced annually to be recycled. Hence, waste PET massively contributes to plastic pollution and damaging the terrestrial and aquatic ecosystems. The global energy and environmental concerns with PET highlight a clear need for technologies in PET “upcycling,” the creation of higher-value products from reclaimed PET. Several microbes that degrade PET and corresponding PET hydrolase enzymes have been successfully identified. The characterization and engineering of these enzymes to selectively depolymerize PET into original monomers such as terephthalic acid and ethylene glycol have been successful. Synthetic microbiology and metabolic engineering approaches enable the development of efficient microbial cell factories to convert PET-derived monomers into value-added products. In this mini-review, we present the recent progress of engineering microbes to produce higher-value chemical building blocks from waste PET using a wholly biological and a hybrid chemocatalytic–biological strategy. We also highlight the potent metabolic pathways to bio-upcycle PET into high-value biotransformed molecules. The new synthetic microbes will help establish the circular materials economy, alleviate the adverse energy and environmental impacts of PET, and provide market incentives for PET reclamation.

scholarly journals Safety Evaluation of Polyethylene Terephthalate Chemical Recycling Processes

2021 ◽  
Vol 13 (22) ◽  
pp. 12854
Author(s):  
Frank Welle
Keyword(s):  
Polyethylene Terephthalate ◽  
Evaluation Criteria ◽  
Safety Evaluation ◽  
Contamination Level ◽  
Chemical Recycling ◽  
Packaging Materials ◽  
Recycling Process ◽  
Mechanical Recycling ◽  
Lack Of Information ◽  
Food Input

Polyethylene terephthalate (PET) is one of the main packaging materials for beverage bottles. Even if this polymer is good to recycle, mechanical recycling processes need a well-sorted input fraction. For less-sorted PET packaging, or even non-food input sources, chemical recycling seems to be a solution to increase PET recycling. For post-consumer recyclates in packaging applications, it is essential that the safety of the recyclates is guaranteed, and the consumers’ health protected. For mechanical recycling processes, evaluation criteria are already established. For chemical recycling processes, however, such evaluation criteria are only roughly available. This study evaluated the safety of the chemical recycling process similar to the approach of the European Food Safety Authority (EFSA). However, due to the lack of information about the contamination level of the input materials for the chemical recycling process, the evaluation was adapted. In addition, the evaluation should be performed separately for the depolymerisation and for the repolymerisation steps. However, due to the high cleaning efficiencies of both steps, the evaluation can focus on the repolymerisation. This simplifies the assessment of the chemical recycling processes considerably.

scholarly journals Chemical Recycling of PET Wastes with Different Catalysts

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Mohammad Khoonkari ◽  
Amir Hossein Haghighi ◽  
Yahya Sefidbakht ◽  
Khadijeh Shekoohi ◽  
Abolfazl Ghaderian
Keyword(s):  
Ionic Liquids ◽  
Ethylene Glycol ◽  
Polyethylene Terephthalate ◽  
Chemical Processes ◽  
Metal Salts ◽  
Chemical Recycling ◽  
Sample Material ◽  
Pet Waste ◽  
The Subject ◽  
The One

Chemical recycling of polyethylene terephthalate, known as PET, has been the subject of increased interest as a valuable feedstock for different chemical processes. In this work, glycolysis of PET waste granules was carried out using excess ethylene glycol in the presence of different simple chemicals acting as catalysts, which are, namely, categorized in ionic liquids, metal salts, hydrotalcites, and enzymes. From every category, some materials as a sample were used, and the one which is going to bring the best result is noted. The effect of some parameters such as temperature, pressure, amount of sample, material ratio, and stirring rate was investigated. As a result we compared the best of each category with the others and final result is shown.

Current developments in chemical recycling of post-consumer polyethylene terephthalate wastes for new materials production: A review

2019 ◽  
Vol 225 ◽  
pp. 1052-1064 ◽  
Author(s):  
Ademola Bolanle Raheem ◽  
Zainura Zainon Noor ◽  
Azman Hassan ◽  
Mohd Kamaruddin Abd Hamid ◽  
Sani Amril Samsudin ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Chemical Recycling ◽  
New Materials

scholarly journals Environment and plastics : A review on greener routes for plastic bottle (PET) waste management through recycling processes

2020 ◽  
Vol 15 (2) ◽  
pp. 105-110
Author(s):  
Swati Singh
Keyword(s):  
Polyethylene Terephthalate ◽  
Value Added ◽  
Waste Recycling ◽  
Operating Conditions ◽  
Chemical Recycling ◽  
Short Term ◽  
Research Papers ◽  
Pet Waste ◽  
Viable Solution ◽  
Value Added Products

Many research papers have been contributed by several authors for making polyethylene terephthalate (PET) waste recycling economically and ecologically more viable as it creates environmental hazards when disposed off after its short term use. Recycling of PET waste was started in last two decades. Most of the authors are devoting their time in getting economically viable solution for development of methods based on either mechanical or chemical recycling. Some success has been obtained in development of chemical recycling methods which provides value added products from PET waste. In this study the operating conditions and mechanism of various recycling processes available for the recycling of polyethylene terephthalate (PET) waste are reported and described.

scholarly journals Análisis Tecno-Económico de Gasificación de Polietileno, caso en México

2019 ◽  
pp. 1-5
Author(s):  
Alfonso Vargas-Santillán ◽  
Alma Leticia Aguilar-González ◽  
Guillermo Capistrano Zuñiga-Neria ◽  
Agustin Jaime Castro-Montoya
Keyword(s):  
Polyethylene Terephthalate ◽  
High Density Polyethylene ◽  
New Technologies ◽  
Low Density Polyethylene ◽  
Chemical Recycling ◽  
Low Density ◽  
Economic Data ◽  
Gasification Process ◽  
Combustible Gas ◽  
Thermochemical Process

As a way to encourage the use of new technologies for the recycling of plastic, the research will obtain techno-economic data for the possible chemical recycling of plastics, the gasification of polyethylene. It was simulated in ASPEN PLUS parcel to technically and economically analyze the viability of the gasification process, taking into account the restrictions and considerations of said process. The main plastic waste that is disposed of in landfills are polyethylene terephthalate, polystyrene and low and high density polyethylene. Gasification is a thermochemical process in which a carbonaceous substrate (in this case plastic) is transformed into a combustible gas through a series of reactions that occur in the presence of a gasifying agent (usually air) in an oxygen-poor environment. The work demonstrates the viability of this type of processes used in plastics such as high and low density polyethylene.

scholarly journals Chemical recycling of polyethylene terephthalate (waste water bottles) for improving the properties of asphalt mixture

2018 ◽  
Vol 162 ◽  
pp. 01042 ◽  
Author(s):  
Mohammed Alzuhairi ◽  
Ahmed Al-Ghaban ◽  
Shams Almutalabi
Keyword(s):  
Polyethylene Terephthalate ◽  
Asphalt Concrete ◽  
Asphalt Mixture ◽  
Mix Design ◽  
Engineering Properties ◽  
Chemical Recycling ◽  
Air Voids ◽  
Concrete Mixtures ◽  
Penetration Tests ◽  
Property Modification

One of the most prevalent of waste materials is Polyethylene Terephthalate (PET) which is used mainly to produce the drinking water bottles. In this research, the waste plastic bottles, which are normally made from PET was used to investigate the possibility of using this material as an additive in asphalt concrete mixtures. Six different proportions (w/w %) of Degradated Polyethylene Terephthalate (DPET) (2, 4, 6, 8, 10, and 12%) have been added to bitumen to prepare the specimens. The tests include Marshall Method of mix design and coating with asphalt. The results indicated that the mixture property modification increased as the content of (DPET) increases. This additive gives maximum flexibility and rigidity of the asphalt, according to ductility and penetration tests. Marshall Method gives better resistance against permanent deformations and better engineering properties in terms of stability, flow value, air voids and water absorption comparing with non-modified mixtures.

Sign in / Sign up

Export Citation Format

Share Document