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US 12,654,151 B2Granted
Method for recycling water absorbent resin
AssigneeNippon Shokubai Co., Ltd.
InventorsKazuki Kimura, Nobuhiro Kobayashi
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Abstract
Provided is a method for recycling a water-absorbing resin which contains absorbed liquid, with consideration for a resource aspect and an energy aspect. The method for recycling a water-absorbing resin which contains absorbed liquid includes: discharging the absorbed liquid from the water-absorbing resin which contains the absorbed liquid; and recovering a water-absorbing power of the water-absorbing resin.
Claims7
A method for recycling a water-absorbing resin contained in a used absorbent article, wherein the water-absorbing resin contains an absorbed liquid, the method comprising:
- (i) an immersion step of immersing the used absorbent article in an immersion liquid containing a hydrophilic organic solvent, wherein the used absorbent article contains the water-absorbing resin that has taken in the absorbed liquid and wherein the hydrophilic organic solvent is an organic solvent which has a solubility of 20 g or more with respect to 100 mL of water at 20° C.;
- (ii) a crushing step of crushing the used absorbent article into a crushed material in the immersion step or prior to the immersion step;
- and
- (iii) a separation step of separating the water-absorbing resin from a mixture of the immersion liquid and the crushed material,
- wherein the hydrophilic organic solvent in the immersion liquid at a time when the immersion step is ended has a concentration of 40 mass % or more.
2 more elements
Dependencies are inferred from the claim text.