Title:
METHOD FOR PRODUCING RECYCLED PULP FIBERS, METHOD FOR DEGRADING SUPER ABSORBENT POLYMER, AND METHOD FOR EVALUATING CLEANLINESS DEGREE OF RECYCLED PULP FIBERS
Document Type and Number:
WIPO Patent Application WO/2023/120597
Kind Code:
A1
Abstract:
The purpose of the present disclosure is to provide a method, which is for producing recycled pulp fibers from a mixture comprising pulp fibers and super absorbent polymer obtained from sanitary products, and with which it is possible to easily degrade and remove super absorbent polymers and efficiently form recycled pulp fibers that are not readily modified. This method for producing recycled pulp fibers from a mixture comprising pulp fibers and super absorbent polymer obtained from sanitary products is characterized by comprising: an ultraviolet ray treatment step in which an aqueous solution comprising said mixture is irradiated with ultraviolet rays including rays of a wavelength of 380 nm or less, the super absorbent polymer is oxidatively degraded, the oxidatively degraded super absorbent polymer is dissolved in the aqueous solution, and the recycled pulp fibers are formed; and a recycled pulp fiber recovery step in which the recycled pulp fibers are recovered.
Inventors:
KONISHI TAKAYOSHI (JP)
ICHIURA HIDEAKI (JP)
ICHIURA HIDEAKI (JP)
Application Number:
PCT/JP2022/047194
Publication Date:
June 29, 2023
Filing Date:
December 21, 2022
Export Citation:
Assignee:
UNICHARM CORP (JP)
International Classes:
D21C5/02; B09B3/00; B09B3/50; C08J11/10; B09B101/67
Domestic Patent References:
| WO2021044690A1 | 2021-03-11 |
Foreign References:
| JP2019084526A | 2019-06-06 | |||
| US20210053028A1 | 2021-02-25 |
Other References:
YOSHIDA, SHUSEI ET AL.: "Recycling of disposal diaper using advanced oxidation process-Effect of pulp characterization on UV oxidation conditions-", PROCEEDINGS OF THE ANNUAL MEETING OF THE JAPAN WOOD RESEARCH SOCIETY; MARCH 15-17, 2022, JAPAN WOOD RESEARCH SOCIETY, JP, vol. 72, 1 March 2022 (2022-03-01) - 17 March 2022 (2022-03-17), JP, pages K15 - P, XP009547194
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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