	US 12,110,242 B2
	Sludge dehydrating agent and sludge dehydration method
Ayako Sakamoto, Tokyo (JP); Shigeru Sato, Tokyo (JP); Kazuya Watanabe, Tokyo (JP); and Shihoko Sekiguchi, Tokyo (JP)
Assigned to KURITA WATER INDUSTRIES LTD., Tokyo (JP)
Appl. No. 17/603,586
Filed by KURITA WATER INDUSTRIES LTD., Tokyo (JP)
PCT Filed Mar. 13, 2020, PCT No. PCT/JP2020/011232 § 371(c)(1), (2) Date Oct. 14, 2021, PCT Pub. No. WO2020/217772, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-082999 (JP), filed on Apr. 24, 2019.
Prior Publication US 2023/0096219 A1, Mar. 30, 2023
Int. Cl. C02F 11/147 (2019.01); B01D 21/01 (2006.01); C02F 1/56 (2023.01); C08F 220/34 (2006.01); C08F 220/38 (2006.01)

CPC C02F 11/147 (2019.01) [B01D 21/01 (2013.01); C02F 1/56 (2013.01); C08F 220/34 (2013.01); C08F 220/385 (2020.02); C08F 2800/10 (2013.01)]

4 Claims

1. A sludge dehydrating agent 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),

wherein the intrinsic viscosity [η] 1 is 1.0 to 6.5 dL/g, and the intrinsic viscosity [η]0.01 is 8.5 to 26.0 dL/g,

wherein the sludge dehydrating agent contains a polymer having the K value, wherein the k value is adopted as a parameter based on an intrinsic viscosity of the polymer which correlates with a degree of spread or contraction of a polymer chain.