The Key to Solving Plastic Packaging Wastes: Design for Recycling and Recycling Technology

Polymers, Journal Year: 2023, Volume and Issue: 15(6), P. 1485 - 1485

Published: March 16, 2023

Confronted with serious environmental problems caused by the growing mountains of plastic packaging waste, prevention and control waste has become a major concern for most countries. In addition to recycling wastes, design can effectively prevent from turning into solid at source. The reasons are that extend life cycle increase values waste; moreover, technologies helpful improving properties recycled plastics expanding application market materials. This review systematically discussed present theory, practice, strategies, methods extracted valuable advanced ideas successful cases. Furthermore, development status automatic sorting methods, mechanical individual mixed as well chemical thermoplastic thermosetting were comprehensively summarized. combination front-end back-end accelerate transformation industry an unsustainable model economic then achieve unity economic, ecological, social benefits.

Language: Английский

---

Recent Advances in Catalytic Chemical Recycling of Polyolefins

ChemCatChem, Journal Year: 2023, Volume and Issue: 15(13)

Published: March 29, 2023

Abstract Polyolefins and especially polyethylenes (LLDPE, LDPE HDPE) polypropylene (PP) contribute a great deal to the growing amounts of plastic waste with combined production share almost 50 % by mass. While being universally applicable, they are mainly used for short‐lived packaging materials that constitute over 60 annual post‐consumer waste. Thus, disproportionately high polyolefins end up as (PCW) management strategies these particularly inert plastics needed. This necessity has promoted research effort dealing valorization discarded but, nevertheless, valuable materials. review aims highlight scientific advances made in chemical polyolefin recycling recent years, focusing, though not exclusively, on catalytic processes recycle various means at more moderate temperatures compared pyrolysis such deconstructing polymer objective upcycling mind or transformation give access functional chemicals.

Language: Английский

---

Chemical recycling of monolayer PET tray waste by alkaline hydrolysis

Journal of environmental chemical engineering, Journal Year: 2023, Volume and Issue: 11(3), P. 109823 - 109823

Published: April 1, 2023

The high demand for recycled polyethylene terephthalate (rPET) driven by an increase in environmental awareness, the application of more restrictive legislations, together with large generation post-consumer PET plastic waste, has resulted urgent need efficient recycling processes. In this work, alkaline hydrolysis is presented as a promising chemical alternative tray waste. depolymerization reactions were carried out under mild conditions (80–100 ºC and atmospheric pressure) using tributylhexadecylphosphonium bromide quaternary salt (TBHDPB) catalyst. Several operating variables studied based on conversion terephthalic acid (TPA) yield criteria: (i) catalyst mass ratio TBHDPB to (0–0.2); (ii) particle size (0.5–10 mm); (iii) stirring rate (350–700 rpm); and, (iv) temperature °C). A good compromise between (99.9%) TPA (93.5%) was established after 4 h reaction, following conditions: TBHDPB:PET ratio, 0.2; 100 °C; size, 1–1.4 mm; rate, 525 rpm. addition, experimental kinetic data correctly fits proposed shrinking core model. Activation energy values 60 57.4 kJ mol-1 non-catalyzed catalyzed reactions, respectively, which implies that does not apparently modify reaction mechanism.

Language: Английский

---

Conversion of waste plastics into value-added carbon materials

Environmental Chemistry Letters, Journal Year: 2023, Volume and Issue: 21(6), P. 3127 - 3158

Published: Aug. 19, 2023

Language: Английский

---

Waste to energy: Trending key challenges and current technologies in waste plastic management

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 913, P. 169436 - 169436

Published: Dec. 29, 2023

Due to the 'forever' degrading nature of plastic waste, waste management is often complicated. The applications are ubiquitous and inevitable in many scenarios. Current global plastics production ca. 3.5 MMT per year, with current trend, will reach 25,000 by 2040. However, rapid growth manufacture material's inherent resulted accumulation a vast amount garbage. recycling rate <10 %, while large volumes discarded cause environmental ecological problems. Recycling rates for vary widely region type plastic. In some developed countries, around 20-30 developing nations, it much lower. These statistics highlight magnitude problem urgent need comprehensive strategies manage more effectively reduce its impact on environment. This review critically analyses past studies essential efficient techniques turning trash into treasure. Additionally, an attempt has been made provide understanding upcycling process, 3Rs policy, life-cycle assessment (LCA) conversion. advocates pyrolysis as one most promising methods valuable chemicals. addition, can be severely impacted due uncontrollable events, such Covid 19 pandemic. chemical certainly bring value end-of-life LCA analysis indicated there still huge scope innovation area compared mechanical recycling. formulation policies heightened public participation could play pivotal role reducing repercussions facilitating shift towards sustainable future.

Language: Английский

---

Bulk Depolymerization of Methacrylate Polymers via Pendent Group Activation

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(9), P. 6217 - 6224

Published: Feb. 21, 2024

In this study, we present an efficient approach for the depolymerization of poly(methyl methacrylate) (PMMA) copolymers synthesized via conventional radical polymerization. By incorporating low mol % phthalimide ester-containing monomers during polymerization process, colorless and transparent polymers closely resembling unfunctionalized PMMA are obtained, which can achieve >95% reversion to methyl methacrylate (MMA). Notably, our catalyst-free bulk method exhibits exceptional efficiency, even high-molecular-weight polymers, including ultrahigh-molecular-weight (10

Language: Английский

---

Chemical recycling of plastic waste for sustainable polymer manufacturing – A critical review

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: 12(2), P. 112323 - 112323

Published: Feb. 25, 2024

Language: Английский

---

Polyester biodegradability: importance and potential for optimisation

Green Chemistry, Journal Year: 2024, Volume and Issue: 26(7), P. 3698 - 3716

Published: Jan. 1, 2024

To meet EU CO 2 emission targets, we need to replace most fossil-derived plastics with renewable alternatives. stop endless pollution by accumulating non degradable future be closed-loop recyclable and/or biodegradable.

Language: Английский

---

Advancements and future directions in waste plastics recycling: From mechanical methods to innovative chemical processes

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 493, P. 152727 - 152727

Published: June 1, 2024

Language: Английский

---

A review on value-addition to plastic waste towards achieving a circular economy

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 921, P. 171106 - 171106

Published: Feb. 21, 2024

Language: Английский

---