WO2019068575A1 - Clarification composition - Google Patents
Clarification composition Download PDFInfo
- Publication number
- WO2019068575A1 WO2019068575A1 PCT/EP2018/076421 EP2018076421W WO2019068575A1 WO 2019068575 A1 WO2019068575 A1 WO 2019068575A1 EP 2018076421 W EP2018076421 W EP 2018076421W WO 2019068575 A1 WO2019068575 A1 WO 2019068575A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- water
- composition
- clarification
- composition according
- mole
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
Definitions
- the present invention relates to a clarification composition and to the use of the clarification composition for treating water used for laundering fabrics.
- the invention particularly relates to a clarification composition comprising an inorganic coagulant and an anionic polymeric flocculant.
- amorphous particles e.g. amorphous AI(OH)3 particles.
- amorphous particles entrap suspended solids leading to clarification of water.
- AI(OH)3 or Fe(OH)3 particles with entrapped suspended solids called sweep floes, have a size in the range of 100 ⁇ or below. At this size the sweep floes are still difficult to separate from the water by, e.g. filtration or decantation. Moreover, the kinetics of settling down of the sweep floes is very slow. Although ferric chloride is good at attracting inorganic solids, a lower efficiency for organic solids is observed.
- This type of flocculation encompasses the addition of a polymer flocculant with a molecular weight of at least 100 kDa. These polymers are believed to adsorb on the sweep floes and thereby bring the sweep floes together to form bigger and stronger floes. This phenomenon is known as "bridging flocculation”. This bridging mechanism helps in increasing the settling velocity of the floes and contributes therefore to faster clarification of water.
- WO 2012/084621 A1 discloses a water purification composition having a flocculant, coagulant, filler and cationic surfactant to provide effective water clarification and purification.
- the polymer coagulant is described to be a neutral and/or anionically modified adsorbing polymer that is preferably polyacrylamide.
- FR2870229 A1 (Acideka SA, 2005) discloses a stable composition for providing as coagulating and/or flocculating agents in solid-liquid separation process where the homogenous mixture of the metal coagulant and the organic flocculant is stabilised using a surfactant system such that the composition is stable and shows no phase separation or appearance of precipitates.
- WO 2015/062881 A1 discloses a composition for purification of water comprising arsenic having a compound of iron and a compound of aluminium with specific ratio between the total iron to total aluminium content and where the aluminium has a basicity of at least 40%.
- a common difficultly observed by the present inventors with such clarification composition having an inorganic coagulant and polymeric flocculant is that the composition is hygroscopic and has a tendency to absorb moisture and form lumps when stored over extended periods, specifically under hot and humid conditions. Lumping is not desirable, as the consumer believe such products to be of inferior quality.
- the inorganic coagulant and polymeric flocculant may interact negatively and may reduce the efficiency of the composition in use.
- the present inventors investigated ways of improving the kinetics of settling down of floes and, in particular, into including an anionic polymeric flocculant in a clarification composition having inorganic coagulant.
- the present inventors have found that incorporating an anionic polymeric flocculant has adverse effects on the storage stability of the clarification composition having inorganic coagulant.
- the present inventors have thus sought to provide a clarification composition including an anionic polymeric flocculant and inorganic coagulant with improved storage stability. It is thus an object of the present invention to provide a free-flowing clarification composition.
- the present inventors have surprisingly found that in a solid clarification composition having an inorganic coagulant, the addition of an anionic polymeric flocculant can improve the kinetics of formation and settling down of floes while also providing improved storage stability and protection against lump formation, and loss of activity in presence of moisture under extended hot and humid storage conditions, when the anionicity of the anionic polymeric flocculant is from 5 mole% to 25 mole%.
- the invention provides a solid clarification composition for removing suspended solids from turbid water, said clarification composition comprising:
- an inorganic coagulant selected from polyaluminium coagulant, poly-iron
- anionic polymer flocculant wherein the anionic polymer flocculant has an anionicity ranging from 5 mole% to 25 mole% and
- the invention provides a process for clarifying turbid water comprising suspended solids, said process comprising the steps of:
- the clarified water is to be used in laundering fabrics.
- the invention provides use of an anionic polymeric flocculant wherein the anionic polymer flocculant has an anionicity ranging from 5 mole% to 25 mole% in a clarification composition according to the first aspect for clarifying water intended for use in laundering fabrics, in less than 3 minutes.
- the invention provides a water clarification kit having a clarification composition of the first aspect and instructions for use instructing users to dose the clarification composition to water to obtain water suitable for laundry washing.
- 'flocculation' refers to a process of contact and adhesion whereby the particles of a dispersion form larger-size clusters.
- Turbidity refers to the cloudiness or haziness of a liquid caused by a large number of individual suspended particles.
- the unit “NTU” as used herein refers to Nephelometric Turbidity Units (NTU), as measured by the nephelometer, Turbiquant® 2100T, manufactured by Merck.
- NTU Nephelometric Turbidity Units
- the nephelometer preferably is calibrated using the standard formazin solutions as recommended by the instrument manufacturer. The nephelometer measures the propensity of particles to scatter a light beam focused on them.
- B [OH] / [Al]
- B [OH] / [Fe]
- aluminium chlorohydrate refers to compounds having the general formula (Al n CI(3n-m)(OH) m ), wherein the basicity of said compounds is from 45 % to 85%.
- anionicity in the meaning of the present invention refers to the relative amount of anionic monomeric units comprised in the anionic polymer flocculant.
- the solid clarification composition according to the invention comprises an inorganic coagulant and an anionic polymeric flocculant.
- the clarification composition is preferably in a solid form, preferably a powder composition; it may also be in the particulate form or a granulated form.
- the powder clarification composition is free flowing.
- Inorganic coagulant :
- the inorganic coagulant of the present invention is selected from polyaluminium coagulant, poly-iron coagulant or combinations thereof.
- the inorganic coagulant in the clarification composition is preferably a polyaluminium coagulant.
- the polyaluminium coagulant in the clarification composition is preferably selected from polyaluminium chloride, polyaluminium chlorosulfate, aluminium chlorohydrate compound and combinations thereof.
- the aluminium chlorohydrate compound in the clarification composition is preferably selected from aluminium chlorohydrate, aluminium chlorohydrate sulfate and combinations thereof. Most preferably, the aluminium chlorohydrate compound is aluminium chlorohydrate.
- the clarification composition according to the present invention preferably comprises 10 to 70 wt.% calculated by weight of dry matter, of the inorganic coagulant.
- the amount of inorganic coagulant in the clarification composition is at least 1 1wt%, still preferably at least 12wt%, further preferably at least 13wt% and most preferably at least 14wt%, but typically not more than 60wt%, still preferably not more than 55 wt% and most preferably not more than 45wt%.
- the clarification composition comprises 12 to 20 wt. % calculated by weight of dry matter, of the inorganic coagulant.
- the basicity of the inorganic coagulant in the clarification composition selected from polyaluminium flocculant, poly-iron flocculant and combinations thereof, is preferably in the range of 45% to 85%, more preferably in the range of 55% to 85% and most preferably in the range of 60% to 85%.
- the composition preferably further contains a metal salt coagulant selected from aluminum sulfate, aluminum chloride, ferric sulfate, ferrous sulfate, ferric chloride and combinations thereof.
- the inorganic coagulant achieves coagulation by decreasing or neutralizing the negative charge or negative zeta potential of insoluble particles by interaction with the coagulant, so that the insoluble particles display an initial aggregation, thereby forming microflocs.
- This process is reversible, so that microflocs exist in a dynamic equilibrium with the surrounding water, which limits their size depending on the conditions. Microflocs have a very loose consistency, which is such that they cannot themselves be isolated from the solution.
- the anionic polymer flocculant of the present invention has anionicity ranging from 5 mole% to 25 mole%.
- the anionic polymer flocculant achieves flocculation, by a process of bringing together microflocs under its influence to form large agglomerates.
- the anionic polymer flocculant adsorbs microflocs.
- the agglomerate of microflocs absorbed to a flocculant is called a floe in the present context.
- floes might break, the formation of floes is in principle not reversible. In contrast to microflocs, floes can be isolated from the solution.
- the anionicity of the anionic polymeric flocculant is at least 8 mole%, still preferably at least 10 mole%, further preferably at least 12 mole% and most preferably at least 13 mole%, but typically not more than 24 mole%, still preferably not more than 22 mole% and most preferably not more than 23 mole%.
- the anionic polymeric flocculant has an anionicity of from 10 to 15 mole%.
- the clarification composition according to the present invention preferably comprises 0.1 to 15 wt.% calculated by weight of dry matter, of the anionic polymer flocculant.
- the amount of anionic polymer flocculant in the clarification composition is at least 0.5wt%, still preferably at least 2wt%, further preferably at least 3wt% and most preferably at least 4wt%, but typically not more than 12wt%, still preferably not more than 10 wt.% and most preferably not more than 8wt%.
- the amount of anionic polymer flocculant in the clarification composition is at least 0.5wt%, still preferably at least 2wt%, further preferably at least 3wt% and most preferably at least 4wt%, but typically not more than 12wt%, still preferably not more than 10 wt.% and most preferably not more than 8wt%.
- the amount of anionic polymer flocculant in the clarification composition is at least 0.5wt%, still preferably at least 2wt%,
- the clarification composition comprises 4 to 10 wt.% calculated by weight of dry matter, of the anionic polymer flocculant.
- the anionicity is the degree of anionic monomeric units present in the anionic polymer flocculant.
- the anionic polymeric flocculant preferably contains randomly repeating monomer units containing chemical functionality which when dissolved in water become anionically charged, such as carboxylate groups, acrylate group, sulfonate grous, phosphonate group, and the like or a combination thereof.
- the anionic polymer flocculant preferably includes anionic monomer units selected from the group consisting of carboxylic acid, acrylic acid, methacrylic acid, 2- acrylamido-2-methylpropane sulphonic acid, sulphonates, phosphonates, and water- soluble salts thereof.
- the anionic monomer units may also be selected from a combination of two or more such units. More preferably the anionic monomer unit is acrylic acid or sodium acrylate.
- Non-limiting examples of an anionic polymer flocculant includes copolymers made by the polymerization of (meth)acryamide, N-vinyl pyrrolidone, N-vinyl formamide, N,N dimethylacrylamide, N-vinyl acetamide, N-vinylpyridine, N-vinylimidazole, isopropyl acrylamide and polyethylene glycol methacrylate, polyacrylamide and one or more anionic monomer(s) such as acrylic acid, methacrylic acid, 2-acrylamido-2- methylpropane sulphonic acid (ATBS) and salts thereof.
- anionic monomer(s) such as acrylic acid, methacrylic acid, 2-acrylamido-2- methylpropane sulphonic acid (ATBS) and salts thereof.
- the anionic polymer flocculant employed in accordance with the present invention is preferably selected from anionic polyacrylamide or a copolymer thereof, anionic polyacrylate and combinations thereof. Most preferably, the anionic polymer flocculant is an anionic polyacrylamide.
- the anionic polymer flocculant is preferably a copolymer of acrylamide and anionic monomer units selected from acrylic acid, methacrylic acid, 2-acrylamido-2- methylpropane sulphonic acid and salts thereof.
- a preferred anionic polymer flocculant is a copolymer of sodium acrylate and polyacrylamide having 5 mole% to 25 mole% of sodium acrylate units.
- the anionic polymeric flocculant has a weight average molecular weight of more than 100 kDa. More preferably, the molecular weight of the flocculant is at least 250 kDa, even more preferably at least 500 kDa and most preferably at least 1000 kDa. It is preferred that the weight average molecular weight of the anionic polymeric flocculant does not exceed 20 million Da. Highly preferred anionic polymer flocculant has a weight of 15 million Da.
- the unit Da (Dalton) as used herein refers to atomic mass unit (amu, the less commonly used SI unit).
- the anionic polymeric flocculant of the present invention is in solid form, preferably powder form.
- the anionic polymeric flocculant has a moisture content from 0 to 12%, still preferably from 0 to 10%, further preferably from 0 to 5% by weight of the anionic polymer flocculant.
- the inorganic filler of the present invention is preferably an inert particulate filler.
- the filler is inert to the other ingredients present in the clarification composition.
- the filler is preferably a solid with a high density.
- the density of the inorganic filler is preferably at least 1.5 kg/dm 3 . More preferably the density of the inorganic filler is between 1.75 to 3.5 kg/dm 3 and most preferably the density of the inorganic filler is between 2 to 2.5 kg/dm 3 .
- the clarification composition according to the present invention preferably comprises 20% to 90 % by weight of the inorganic filler, calculated by weight of dry matter. More preferably the clarification composition comprises 25% to 85 % by weight of the inorganic filler, most preferably the purification composition comprises 30% to 50 % by weight of the inorganic filler, calculated by weight of dry matter.
- the inorganic filler is preferably selected from feldspar, clay, alumina, aluminium hydroxides, magnesium hydroxides, iron hydroxides, calcite, and combinations thereof. More preferably the inorganic filler is selected from feldspar, clay and combinations thereof. Even more preferably the inorganic filler is selected from feldspar, bentonite and combinations thereof. Most preferably the inorganic filler is feldspar.
- the clarification composition according to the present invention preferably has a water content of not more than 15 % by weight. More preferably the water content of the clarification composition is not more than 12 % by weight. Most preferably the water content of the clarification composition is within 5 to 10 % by weight. Preferably the water content of the clarification composition is from 0wt% to 15wt%, still preferably 0wt% to 12wt%, further preferably 0wt% to 10wt%, still further preferably 3 wt% to The clarification composition is preferably prepared according to the following steps. Preferably, the individual ingredients are weighed as per the proportion and mixed using an appropriate powder mixing apparatus or equipment known in the art. Method for clarifying turbid water
- the invention provides a process for clarifying turbid water comprising suspended solids, said process comprising the steps of:
- the clarification composition is preferably dosed in a dose of 0.2 to 5 grams per litre of water and still preferably in a dose of 0.2 to 4 grams per litre water and most preferably 0.2 to 3 grams per litre water.
- Dispersing of the clarification composition throughout the water to be clarified can be achieve, for instance, by stirring.
- Stirring in the process of the present invention is preferably performed for at least 10 seconds, more preferably performed for 15 to 60 seconds and most preferably the stirring of the mixture is performed for 15 to 50 seconds.
- Different patterns of stirring may be followed applied, e.g. stirring-pause- stirring or stirring-pause or variations thereof.
- the separation of the precipitated floes from the water is preferably performed by filtration, decantation and combinations thereof. More preferably the separation of the precipitate from the water is performed by filtration.
- the turbidity of the water to be clarified is reduced to less than 70 NTU, more preferably less than 60 NTU, still preferably less than 50 NTU and more preferably to less than 30 NTU, still preferably less than 20 NTU and most preferably less than 15NTU by the present process.
- the water to be clarified in the present process has an initial turbidity of 100 NTU or more, more preferably 200 NTU or more, still preferably 400 NTU or more.
- the invention provides use of an anionic polymer flocculant wherein the anionic polymer flocculant has an anionicity of 5 mole% to 25 mole% in a clarification composition according to the first aspect for clarifying water intended for use in laundering fabrics, in less than 3 minutes.
- the invention provides a water clarification kit having a clarification composition of the first aspect and instructions for use instructing users to dose the clarification composition to water to obtain water suitable for laundering fabrics.
- the clarification composition is provided in a package, more suitably a flexible package or a container.
- the package may be made of any suitable material and form known in the art for enclosing a solid composition, particularly a powder, particulate or granular composition.
- the kit may preferably include a bucket and a separator plate configuration.
- the bucket may preferably include a water discharge means such as a faucet.
- the water clarification kit includes an alkaline buffering agent selected from calcium oxide, sodium carbonate, sodium bicarbonate, calcium hydroxide, magnesium oxide, magnesium hydroxide and combinations thereof.
- an alkaline buffering agent selected from calcium oxide, sodium carbonate, sodium bicarbonate, calcium hydroxide, magnesium oxide, magnesium hydroxide and combinations thereof.
- Example 1 Storage stability and performance of different clarification compositions Different clarification compositions were prepared according to the ingredients showed in table 1 . All the ingredients were weighed as per proportion and were dry mixed to form a homogeneous mixture. Several petridish were then taken and filled with the prepared compositions. The petridishes were then stored for 4 weeks at a temperature of 37°C and relative humidity of 70% in an open condition. Model turbid water was prepared by addition of model particulate soil to tap water and liquid detergent. The turbidity of this model dirty water was measured to be 150 NTU with a pH of 6.5 to 8. The clarification compositions shown in Table 1 were added to the aforementioned turbid water in an amount of 0.5 gram per litre while continuously stirring, for 30 seconds at 100 rpm.
- inorganic coagulant used was aluminium chlorohydrate with basicity 85 %
- anionic polymeric flocculant used was a copolymer of acrylamide and sodium acrylate with specific mole% of sodium acrylate units.
- the table above shows that the desired reduction in turbidity is shown by the composition of Ex 1 and Ex 2 that has anionic polymer flocculant with anionicity according to the invention.
- the composition of Ex A which has an anionic polymer flocculant with anionicity outside the claimed ranges is not storage stable after 2 weeks of the study and does not provide the desired clarification and after 2 weeks of storage study the composition fails to flocculate turbid water.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Detergent Compositions (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112020006829-2A BR112020006829B1 (en) | 2017-10-04 | 2018-09-28 | PACKAGED SOLID WHITENING COMPOSITION, PROCESS FOR BLIGHTENING WATER, USE OF AN ANIONIC POLYMERIC FLOCCULANT AND WATER WHITENING KIT |
CN201880065437.XA CN111201203A (en) | 2017-10-04 | 2018-09-28 | Decontamination composition |
PH12020550123A PH12020550123A1 (en) | 2017-10-04 | 2020-03-16 | Clarification composition |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP17194669 | 2017-10-04 | ||
EP17194669.2 | 2017-10-04 |
Publications (1)
Publication Number | Publication Date |
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WO2019068575A1 true WO2019068575A1 (en) | 2019-04-11 |
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ID=60164577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2018/076421 WO2019068575A1 (en) | 2017-10-04 | 2018-09-28 | Clarification composition |
Country Status (3)
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CN (1) | CN111201203A (en) |
PH (1) | PH12020550123A1 (en) |
WO (1) | WO2019068575A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2870229A1 (en) | 2004-05-13 | 2005-11-18 | Acideka Sa Sa | Composition, useful as coagulating and flocculating agent in a process of solid-liquid separation, comprises metallic coagulant, polymeric organic flocculant and tensioactive system (non ionic, anionic or cationic tensio active system) |
WO2012084621A1 (en) | 2010-12-24 | 2012-06-28 | Unilever Nv | Water clarification composition and process |
CN102557218B (en) * | 2011-12-19 | 2013-11-06 | 上海沃杉化工有限公司 | Composite flocculating agent containing various polyacrylamides and preparation method for composite flocculating agent |
WO2015062881A1 (en) | 2013-11-01 | 2015-05-07 | Unilever N.V. | Composition for purification of water |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE31900E (en) * | 1980-12-16 | 1985-05-28 | American Cyanamid Company | Process for the flocculation of suspended solids |
CN102477134A (en) * | 2010-11-22 | 2012-05-30 | 袁连海 | Synthetic technology of hydrophobic polymeric flocculant for controlling content of anionic monomer |
CN102807276B (en) * | 2012-08-13 | 2014-11-26 | 中国石油天然气股份有限公司 | Wastewater treatment agent for oil well fracturing flowback wastewater and treatment method |
CN104619650B (en) * | 2012-09-10 | 2018-06-05 | 栗田工业株式会社 | Method for treating water and device |
-
2018
- 2018-09-28 WO PCT/EP2018/076421 patent/WO2019068575A1/en active Application Filing
- 2018-09-28 CN CN201880065437.XA patent/CN111201203A/en active Pending
-
2020
- 2020-03-16 PH PH12020550123A patent/PH12020550123A1/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2870229A1 (en) | 2004-05-13 | 2005-11-18 | Acideka Sa Sa | Composition, useful as coagulating and flocculating agent in a process of solid-liquid separation, comprises metallic coagulant, polymeric organic flocculant and tensioactive system (non ionic, anionic or cationic tensio active system) |
WO2012084621A1 (en) | 2010-12-24 | 2012-06-28 | Unilever Nv | Water clarification composition and process |
CN102557218B (en) * | 2011-12-19 | 2013-11-06 | 上海沃杉化工有限公司 | Composite flocculating agent containing various polyacrylamides and preparation method for composite flocculating agent |
WO2015062881A1 (en) | 2013-11-01 | 2015-05-07 | Unilever N.V. | Composition for purification of water |
Also Published As
Publication number | Publication date |
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PH12020550123A1 (en) | 2021-02-08 |
BR112020006829A2 (en) | 2020-10-06 |
CN111201203A (en) | 2020-05-26 |
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