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US 12,036,513 B2Granted
Desalination performance restoration agent for cellulose acetate membrane and desalination performance restoration method for cellulose acetate membrane
AssigneesMitsubishi Heavy Industries, Ltd., Kyoeisha Chemical Co., Ltd.
InventorsTakayoshi Hori, Katsunori Matsui, Sho Yokogawa, Yoshiaki Ito, Ryo Kamito, Yoshihisa Katsunishi, Atsuyoshi Ueda, Takahiro Masui
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Abstract
A desalination performance restoration agent for a cellulose acetate membrane contains: a solvent; and a modified polyvinyl alcohol mixed in the solvent. The modified polyvinyl alcohol has an acetyl group structure in at least part of polyvinyl alcohol.
Claims17
An agent comprising:
- a solvent,
- a modified polyvinyl alcohol mixed in the solvent,
- an organic acid, and
- a salt of the organic acid,
- wherein the modified polyvinyl alcohol has an acetyl group structure in at least part of polyvinyl alcohol, and
- wherein the organic acid is selected from the group consisting of glycolic acid, diglycolic acid, oxydisuccinic acid, carboxymethyloxysuccinic acid, citric acid, lactic acid, tartaric acid, oxalic acid, malic acid, gluconic acid, adipic acid, sveric acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexacetic acid, and mixtures thereof.
3 more elements
Dependencies are inferred from the claim text.