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US 11,993,684 B2Granted
Recycling of superabsorbent polymer with a hybrid oxidative degradation and high shear mixing
AssigneeThe Procter & Gamble Company
InventorsDimitris Ioannis Collias, Gary Wayne Gilbertson, Martin Ian James, Morgan Christine McGrath, Raul Victorino Nunes, Heitham Darrell Safi, Arsen Arsenov Simonyan, John Christopher Wesner
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Abstract
New process for recycling of poly(acrylic acid)-based superabsorbent polymer (SAP) using a synergistic combination of high shear mixing device and oxidative degradation of SAP to produce poly(acrylic acid) (PAA) useful to recycle pre- and post-consumer SAP.
Claims26
A process for degrading acrylic acid based superabsorbent polymer (SAP) to poly(acrylic acid) PAA comprising:
- a. Forming a solution, wherein the solution comprises an oxidizer soluble salt in water at a dissolution temperature and a dissolution concentration;
- b. Dispersing SAP into the solution, forming an SAP dispersion, using a mixer with power input NP/M greater than about 20 W/kg solution;
- and
- c. Reacting said oxidizer with said SAP at a reaction temperature and for a reaction time to produce a PAA solution.
1 more element
Dependencies are inferred from the claim text.