Efficient wax production from HDPE waste using nacl
Innovative method to convert HDPE plastic waste into high-yield waxes using NaCl. This process enhances plastic recycling economics and offers environmental benefits by lowering degradation temperatures, increasing wax yield, and reducing energy consumption.
Overview
This solution introduces a novel method for upcycling high-density polyethylene (HDPE) plastic waste into valuable wax products by using sodium chloride (NaCl) as an additive. By integrating NaCl, the degradation temperature of HDPE during pyrolysis is reduced, allowing for a higher yield of waxes at lower temperatures (400–500°C), compared to traditional methods requiring temperatures above 600°C. This innovation not only enhances the economic viability of plastic recycling through a potential revenue of $14.82 million annually but also aligns with sustainable practices by converting waste into valuable products with up to 93% yield.
Technical specifications
- Process Additive: Sodium chloride (NaCl) lowers the degradation temperature of HDPE.
- Pyrolysis Temperature: Reduced to 400–500°C, facilitating selective wax formation.
- Economic Impact: Potential annual production of 7,560 tons of wax, generating significant revenue.
- Environmental Benefits: Reduced energy consumption and emissions due to lower pyrolysis temperatures.
- Wax Recovery Methods: Involves chloroform dissolution, salt scraping, and hot-water dispersion for efficient wax separation.
- Feedstock Preparation: HDPE waste from milk gallon containers is processed into flakes and powder for pyrolysis.
Technology readiness level
Currently, this technology is at TRL 3, indicating that experimental proof of concept has been demonstrated. The method awaits further validation and scaling to reach higher readiness levels.
About Tecnológico de Monterrey
Tecnológico de Monterrey is a leading private, multi-campus research university in Mexico, recognized for entrepreneurship and industry collaboration. Its Monterrey headquarters anchors an urban innovation district with open lab space, prototyping, and shared testing facilities that welcome corporate collaborators. An integrated health system supports clinical research and translation, while structured internships and challenge-driven partnerships connect companies with faculty and student talent year-round. Research is supported by competitive federal funding through Mexico’s national science and technology council, along with industry contracts and international sponsors. A dedicated technology transfer office manages IP, licensing, and startup formation.
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