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Title:
RECOVERY METHOD FOR EXCREMENT AND ORGANIC ACID, AND PRODUCTION METHOD FOR RECYCLED PULP FIBERS
Document Type and Number:
WIPO Patent Application WO/2019/087487
Kind Code:
A1
Abstract:
The purpose of the present disclosure is to provide a recovery method that makes it possible to individually recover excrement and an organic acid from a deactivating aqueous solution that includes the excrement and the organic acid. This recovery method has the following features. A method for recovering excrement and an organic acid from a deactivating aqueous solution that is for use on a highly water-absorbent polymer and includes the excrement and the organic acid, the method being characterized by including: a precipitation step (S1) in which a metal salt or a base is added to the deactivating aqueous solution to precipitate a water-insoluble salt of the organic acid; a mixture collecting step (S2) in which a mixture of the water-insoluble salt of the organic acid and solid excrement that originates from the excrement is collected from the deactivating aqueous solution; an organic acid generation step (S3) in which water and an acid that can generate the free organic acid and a water-insoluble salt are added to the mixture to form an aqueous solution that includes the organic acid, the water-insoluble salt, and the solid excrement; and an organic acid aqueous solution acquisition step (S4) in which the water-insoluble salt and the solid excrement are removed from the aqueous solution to obtain an organic acid aqueous solution that includes the organic acid.

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:
JP2018/028146
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:
C07C51/487; B09B3/00; C02F1/30; C02F1/32; C02F1/50; C02F1/58; C07C59/265
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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