公开(公告)号：US20210230039A1

公开(公告)日：2021-07-29

申请号：US15733867

申请日：2019-05-30

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shigeru SATO ,  Shihoko SEKIGUCHI ,  Minoru WATANABE

IPC: C02F11/147 ,  C08F120/34 ,  C08F120/56 ,  C08L33/16 ,  C08L33/26

Abstract: Provided is a sludge dehydration agent which enables the formation of stiff and coarse flocs even when added in a relatively small amount, has excellent gravity filtration properties, enables the production of a dehydrated cake having a low water content, and also enables an efficient dehydration treatment. A sludge dehydration agent comprising a polymer having a constituent unit derived from a cationic monomer, wherein the colloid equivalent value decrease rate of the polymer, which is calculated from mathematical formula 1, is 10% or more. (In mathematical formula 1, the colloid equivalent value (I) is a colloid equivalent value at pH 4 which is measured in deionized water by a colloid titration method, and the colloid equivalent value (II) is a colloid equivalent value at pH 4 which is measured in salt water having a concentration of 0.01 mol/L by a colloid titration method.)

公开(公告)号：US20230096219A1

公开(公告)日：2023-03-30

申请号：US17603586

申请日：2020-03-13

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ayako SAKAMOTO ,  Shigeru SATO ,  Kazuya WATANABE ,  Shihoko SEKIGUCHI

IPC: C02F11/147 ,  B01D21/01 ,  C08F220/34 ,  C02F1/56 ,  C08F220/38

Abstract: Provided are: a sludge dehydrating agent which can exert a steady dehydrating effect on various types of sludge and has excellent dehydration performance; and a sludge dehydration method using the sludge dehydrating agent. The sludge dehydrating agent of the present invention with a polymer which has a constituent unit derived from a cationic monomer, wherein a value k determined from an intrinsic viscosity [η] 1 [dL/g] of a 1-mol/L aqueous sodium nitrate solution of the polymer at 30° C. and an intrinsic viscosity [η] 0.01 [dL/g] of a 0.01-mol/L aqueous sodium nitrate solution of the polymer at 30° C. in accordance with formula (I) is 0.8 to 2.2 exclusive. k=([η]0.01−[η]1)/9   (I)

公开(公告)号：US20230020603A1

公开(公告)日：2023-01-19

申请号：US17777278

申请日：2020-12-04

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Ayako SAKAMOTO ,  Shigeru SATO ,  Kazuya WATANABE ,  Yukihito MASUI

IPC: C02F11/147

Abstract: A sludge dehydrating agent comprising a cationic polymer which has: a constitutional unit a derived from a quaternary ammonium salt having a specific structure; and at least one constitutional unit selected from among a constitutional unit b derived from a quaternary ammonium salt having a specific structure and a constitutional unit c derived from a tertiary amine salt having a specific structure, wherein the intrinsic viscosity of the cationic polymer at 30° C. in a 1 mol/L sodium nitrate aqueous solution is 0.5-4.0 dL/g.