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Title:
METHOD AND SYSTEM FOR RECOVERING PULP FIBERS AND HIGHLY WATER-ABSORBENT POLYMER FROM USED ABSORBENT ARTICLES
Document Type and Number:
WIPO Patent Application WO/2019/087485
Kind Code:
A1
Abstract:
Provided is a method that, when pulp fibers and a highly water-absorbent polymer are to be recovered from used absorbent articles, makes it possible to highly efficiently separate the pulp fibers and the highly water-absorbent polymer. This method comprises: a deactivation step (S13) in which pulp fibers and a highly water-absorbent polymer that have been separated from used absorbent articles are mixed with an acidic aqueous solution and the highly water-absorbent polymer is deactivated, the acidic aqueous solution having been adjusted to a pH at which the respective differences between the specific gravity and size of the highly water-absorbent polymer and the specific gravity and size of the pulp fibers are within prescribed ranges; a size separation step (S15) in which, in the acidic aqueous solution that includes the pulp fibers and the highly water-absorbent polymer, while pH is maintained within a prescribed range, difference in size is used to separate the pulp fibers and the highly water-absorbent polymer from other materials; and a specific gravity separation step (S16) in which, in the acidic aqueous solution that includes the pulp fibers and the highly water-absorbent polymer, while pH is maintained within a prescribed range, difference in specific gravity is used to separate the pulp fibers and the highly water-absorbent polymer from the other materials.

Inventors:
KONISHI, Takayoshi (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
HIRAOKA, Toshio (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
KATO, Takashi (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
KURITA, Noritomo (1531-7 Wadahama, Toyohama-cho, Kanonji-sh, Kagawa 02, 〒7691602, JP)
Application Number:
JP2018/028138
Publication Date:
May 09, 2019
Filing Date:
July 26, 2018
Export Citation:
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Assignee:
UNICHARM CORPORATION (182 Shimobun, Kinsei-cho Shikokuchuo-sh, Ehime 11, 〒7990111, JP)
International Classes:
B09B5/00; B03B5/00; B03B5/28; B03B9/06; B09B3/00; B29B17/02; D21B1/32
Foreign References:
JP2013150976A2013-08-08
JP2016079525A2016-05-16
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, 〒1058423, JP)
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