Recycling of superabsorbent polymer via hydrothermal microwave processing

US11396587B2 · kind B2 · utility

Assignee

• The Procter & Gamble Company · US

Inventors

• Mark M. Banaszak Holl · Geraldton, AU
• Akshat Tanksale · Melbourne, AU
• Teck Wei Ching · Melbourne, AU
• Jing Zhang · Poughkeepsie, US
• Dimitris Ioannis Collias · Mason, US
• John Andrew McDaniel · Middletown, US
• Gary Wayne Gilbertson · Wadsworth, US
• Martin Ian James · Cincinnati, US
• Arsen Arsenov Simonyan · Schwalbach, DE

Key dates

• Filing date: Aug 21, 2020
• Grant date: Jul 26, 2022
• Expiry date: Aug 21, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2333/06
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Poly(acrylic acid)-based superabsorbent polymer (SAP) and H2O2 in a feed is converted with microwave (MW) irradiation into poly(acrylic acid) (PAA) in the product. The MW total energy used to convert SAP into PAA is less than 50 MJ/kg SAP.