公开(公告)号：WO2021106148A1

公开(公告)日：2021-06-03

申请号：PCT/JP2019/046588

申请日：2019-11-28

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： MATHEIS Jurgen ,  WOLF Florian ,  HATER Wolfgang

IPC: C02F5/00 ,  C02F5/12 ,  C02F5/14

Abstract: The present invention relates to anionic copolymers, which are suitable as scaling inhibitors in water bearing systems, in particular as inhibitors for the formation of antimony(III) sulfide-containing scale. The present invention also relates to a method for reducing scaling in water bearing systems, in particular in water loops of geothermal power plants, in which the formation of sulfide-containing scale and especially the formation of antimony(III) sulfide-containing scale may occur. The anionic copolymers have the following characteristics: 1) The copolymers comprise a. polymerized units of a monomer M1, which is a primary amide of a monoethylenically unsaturated monocarboxylic acid having 3 to 6 C atoms and b. polymerized units of a monoethylenically unsaturated monomer M2, which is selected from monoethylenically unsaturated monomer having a sulfonate group and or a sulfate group and monoethylenically unsaturated monomer having a carboxyl group and mixtures thereof; 2) The copolymers have an anionic charge density in the range from 0.5 to 6.0 mol/kg, 3) The sodium salts of the copolymers have a weight average molecular weight Mw of at least 10000 g/mol, as determined by gel permeation chromatography.

公开(公告)号：WO2021117727A1

公开(公告)日：2021-06-17

申请号：PCT/JP2020/045697

申请日：2020-12-08

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： WOLF Florian ,  HATER Wolfgang ,  DISCI-ZAYED Duygu ,  LEANEY Deborah ,  STRATMANN Anika

IPC: C02F5/10 ,  C02F103/08 ,  C02F103/18

Abstract: The invention relates to the use of a copolymer, which consists of at least 95% by weight, based on the total weight of the copolymer in its acid form, of a combination of polymerized units of acrylic acid and polymerized units of a C1-C3 alkyl acrylate, where the amount of polymerized units of the C1-C3 alkyl acrylate is in the range from 3 to 30% by weight, based on the total weight of the copolymer in its acid form, and where the copolymer in the form of its sodium salt has a weight average molecular weight Mw in the range from 500 to 4000 g/mol, as determined by gel permeation chromatography, for reducing the formation of magnesium hydroxide containing scale. The invention also relates to a method for reducing the formation of magnesium hydroxide containing scale in a water-treatment unit for processing Mg containing water, which comprises the addition of a copolymer as defined herein to the Mg containing water to be treated in the water-treatment unit.

公开(公告)号：WO2022050276A1

公开(公告)日：2022-03-10

申请号：PCT/JP2021/031956

申请日：2021-08-31

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： WOLF Florian ,  HATER Wolfgang ,  DISCI-ZAYED Duygu ,  LEANEY Deborah ,  STRATMANN Anika

IPC: C02F5/10 ,  C02F103/08 ,  C02F103/02

Abstract: The present invention relates to the use of copolymers of acrylic acid and C1-C3 alkyl acrylates with an Mw of from 5200 to 20000 g/mol, calculated as its sodium salt, for reducing the formation of inorganic scale in water-bearing systems. The acrylate content in the copolymer is from 3 to 50 mol-%, and at least 50 mol-% of the polymerized C1-C3 alkyl acrylate units are polymerized units of a C2-C3 alkyl acrylate. The invention also relates to a method for reducing the formation of inorganic scale in a water-bearing system comprising adding such a copolymer to the water contained in the water bearing system.

公开(公告)号：WO2021106710A1

公开(公告)日：2021-06-03

申请号：PCT/JP2020/042984

申请日：2020-11-18

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： MATHEIS Jurgen ,  WOLF Florian ,  HATER Wolfgang

IPC: C02F5/00 ,  C02F5/12 ,  C02F5/14 ,  C02F101/10

Abstract: The present invention relates to anionic copolymers, which are suitable as sulfide scaling inhibitors in water bearing systems, in particular as inhibitors for the formation of antimony(III) sulfide-containing scale. The present invention also relates to a method for reducing sulfide scaling in water bearing systems, in particular in water loops of geothermal power plants, in which the formation of sulfide-containing scale and especially the formation of antimony(III) sulfide-containing scale may occur. The anionic copolymers have the following characteristics: 1) The copolymers comprise a. polymerized units of a monomer M1, which is a primary amide of a monoethylenically unsaturated monocarboxylic acid having 3 to 6 C atoms and b. polymerized units of a monoethylenically unsaturated monomer M2, which is selected from monoethylenically unsaturated monomer having a sulfonate group and or a sulfate group and monoethylenically unsaturated monomer having a carboxyl group and mixtures thereof; 2) The copolymers have an anionic charge density in the range from 0.5 to 6.0 mol/kg, 3) The sodium salts of the copolymers have a weight average molecular weight Mw of at least 10000 g/mol, as determined by gel permeation chromatography.

公开(公告)号：WO2022049702A1

公开(公告)日：2022-03-10

申请号：PCT/JP2020/033464

申请日：2020-09-03

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： WOLF Florian ,  HATER Wolfgang ,  DISCI-ZAYED Duygu ,  LEANEY Deborah ,  STRATMANN Anika

IPC: C02F5/10 ,  C02F103/08 ,  C02F103/02

Abstract: The present invention relates to the use of copolymers of acrylic acid and C1-C3 alkyl acrylates with an Mw of from 5200 to 20000 g/mol, calculated as its sodium salt, for reducing the formation of inorganic scale in water-bearing systems. The acrylate content in the copolymer is from 3 to 50 mol-%, and at least 50 mol-% of the polymerized C1-C3 alkyl acrylate units are polymerized units of a C2-C3 alkyl acrylate. The invention also relates to a method for reducing the formation of inorganic scale in a water-bearing system comprising adding such a copolymer to the water contained in the water bearing system.

公开(公告)号：WO2021117134A1

公开(公告)日：2021-06-17

申请号：PCT/JP2019/048292

申请日：2019-12-10

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： WOLF Florian ,  HATER Wolfgang ,  DISCI-ZAYED Duygu ,  LEANEY Deborah ,  STRATMANN Anika

IPC: C02F5/10 ,  C02F103/08 ,  C02F103/18

Abstract: The invention relates to the use of a copolymer, which consists of at least 95% by weight, based on the total weight of the copolymer in its acid form, of a combination of polymerized units of acrylic acid and polymerized units of a C1-C3 alkyl acrylate, where the amount of polymerized units of the C1-C3 alkyl acrylate is in the range from 3 to 30% by weight, based on the total weight of the copolymer in its acid form, and where the copolymer in the form of its sodium salt has a weight average molecular weight Mw in the range from 500 to 4000 g/mol, as determined by gel permeation chromatography, for reducing the formation of magnesium hydroxide containing scale. The invention also relates to a method for reducing the formation of magnesium hydroxide containing scale in a water-treatment unit for processing Mg containing water, which comprises the addition of a copolymer as defined herein to the Mg containing water to be treated in the water-treatment unit.