公开(公告)号：US20240401207A1

公开(公告)日：2024-12-05

申请号：US18699889

申请日：2022-08-31

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Takanori YOSHINO ,  Ayako KUMAGAI ,  Kazuhisa FUJITA ,  Kenya SATO ,  Kazuya WATANABE ,  Wei XIA

IPC: C23F15/00

Abstract: The present invention addresses the problem of providing a technique for a metal corrosion protection treatment for a water system, whereby it becomes possible to achieve a satisfactory anticorrosive effect without using a phosphorus compound, which is a causative substance for eutrophication, as a metal anticorrosive agent and it also becomes possible to achieve a satisfactory anticorrosive effect in high-hardness water as well as low-hardness water. The present invention can provide: a metal corrosion protection treatment method for a water system, in which a component (A) and a component (B) as mentioned below are allowed to be present at a usage ratio of 1:9 to 7:3 by mass in the water system; and (A) a copolymer of a (meth)acrylic acid monomer and a sulfonic acid monomer, and (B) a maleic acid-based polymer in which the carboxyl group content is 11.5 mmol/g or more.

公开(公告)号：US20240328730A1

公开(公告)日：2024-10-03

申请号：US18574037

申请日：2022-03-16

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Kazuya WATANABE ,  Masakazu KOIZUMI

IPC: F28F23/00 ,  F28B1/00 ,  F28F21/08

CPC classification number: F28F23/00 ,  F28B1/00 ,  F28F21/083

Abstract: Provided is a method for improving efficiency of heat transmission that enables improving the efficiency of heat transmission by steam in a steam system at a pH of less than 7. A method for improving the efficiency of heat transmission by steam, wherein, in a step of introducing steam into a heat exchanger to heat an object to be heated or a step of contacting the steam with a cooling body to liquefy the steam, a sarcosine compound is allowed to be present in the steam system at a pH of less than 7. As the sarcosine compound, a long-chain sarcosine compound represented by the following formula (I) is preferable. R1C(═O)—N(CH3)—(CH2)n—COOR2 . . . (I) In formula (I), R1 is an unsaturated or saturated linear or branched hydrocarbon group having 7 to 24 carbon atoms, n is an integer of 0 to 2, and R2 is a hydrogen atom or a salt-forming group.

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.