EP1966096A2 - Utilisation de phytate pour le traitement de l'eau - Google Patents

Utilisation de phytate pour le traitement de l'eau

Info

Publication number
EP1966096A2
EP1966096A2 EP06807037A EP06807037A EP1966096A2 EP 1966096 A2 EP1966096 A2 EP 1966096A2 EP 06807037 A EP06807037 A EP 06807037A EP 06807037 A EP06807037 A EP 06807037A EP 1966096 A2 EP1966096 A2 EP 1966096A2
Authority
EP
European Patent Office
Prior art keywords
water
phytate
calcium
use according
myo
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06807037A
Other languages
German (de)
English (en)
Inventor
Félix GRASES FREIXEDAS
Joan PERELLÓ BESTARD
Bernat Isern Amengual
Antonia COSTA BAUZÀ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanifit Therapeutics SA
Original Assignee
Laboratoris Sanifit SL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Laboratoris Sanifit SL filed Critical Laboratoris Sanifit SL
Publication of EP1966096A2 publication Critical patent/EP1966096A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/36—Organic compounds containing phosphorus
    • C11D3/362—Phosphates or phosphites
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits

Definitions

  • This invention relates to methods of water treatment to prevent the formation of precipitates.
  • this invention relates to the use of phytate to inhibit the nucleation and growth in water of calcium carbonate and of other salts with one divalent cation selected from Ca 2+ and Mg 2+ .
  • Hard water presents the problem of formation of precipitates (mainly calcium carbonate, but also other salts that co-precipitate) on the walls of the pipes and systems through which they circulate, reducing the life of household electrical appliances if such precipitated deposits are not removed at intervals, and even blocking pipes. This problem is accentuated where the water is hot, in which case there can be breakages or explosions due to overheating of the pipes or boilers. That is precisely why hard water cannot be used in steam boilers.
  • precipitates mainly calcium carbonate, but also other salts that co-precipitate
  • Detergents are sodium or potassium salts of a long-chain fatty acid formed by the reaction of fats and oils with an alkaline compound. Such detergents are soluble in water or at least can be dispersed in it to form a colloid. However, the calcium and magnesium salts of long-chain fatty acids are insoluble in water, so that they precipitate and do not form foam.
  • Ion exchangers are generally zeolites and ion- exchange resins.
  • the zeolites are natural or artificial aluminosilicates insoluble in water and chemically constitute fixed macroanions electrically neutralised by cations.
  • the exchange is carried out by making the water pass through a bed of a certain thickness, gradually encountering pure sodium zeolite. When the zeolite is exhausted it is regenerated with sodium chloride.
  • Reverse osmosis devices reduce the dissolved salts content in the water by applying a high pressure through a semi-permeable membrane.
  • a semi-permeable membrane separates two solutions of different saline concentration
  • the water circulates from the more diluted medium to the more concentrated medium, thereby setting up a pressure difference between each of the two sides of the membrane, a phenomenon known as osmotic pressure.
  • the application of a higher pressure than this osmotic pressure reverses the flow, thereby providing one increasingly less concentrated solution and one increasingly concentrated solution.
  • polyamino acids polyaspartic acid, polyarginine, polycysteine
  • polyacrylic acid synergically with phytic acid to inhibit the formation of incrustations of calcium, magnesium and iron on the membranes of reverse osmosis systems has also been described (see, for example, Spanish patent no. 520.904/8).
  • chelating or sequestering agents are also widely used. These agents combine with the metallic ions (calcium chelating agents are preferably used) in the water. The metallic ion is surrounded by the sequestering agent and a complex of anionic charge forms. This reduces the effective concentration of the ion, so that the supersaturation in relation to certain salts is reduced, thereby preventing the formation of solid deposits and reduction in the efficacy of detergents.
  • the chelating agents used are the phosphates. Tripolyphosphate was usually used in detergents, combining with the calcium and magnesium through the formation of soluble complexes, though also sequestering the iron and dissolved manganese (that interfere in detergence) .
  • EDTA ethylenediamine tetraacetic acid
  • An object of this invention is to provide an alternative to the existing methods, allowing the formation of precipitates in the water to be prevented but without altering its ionic composition.
  • this invention relates to the use of myo-inositol hexaphosphate to inhibit nucleation and growth in the water of calcium carbonate salt and of other salts with one divalent cation selected from calcium and magnesium.
  • phytate or “myo-inositol hexaphosphate” is taken to mean the molecule that corresponds to the formula
  • salts which include but are not limited to salts of sodium, potassium, calcium, magnesium or calcium-magnesium salts.
  • Myo-inositol hexaphosphate is a natural product that accumulates in the seeds of cereals, vegetables and nuts and that has many beneficial effects for health, such as its antioxidant effect or a preventive effect for certain types of cancers.
  • crystal growth inhibitor is taken to mean a substance that is capable of reducing or preventing the formation of a nucleus or development of such a nucleus into a crystal. This inhibiting effect is due to the fact that the phytate is adsorbed on the nucleus undergoing formation or the growing crystal and inhibits their development. As explained in detail below, this is a purely kinetic factor that does not alter the supersaturation of the compound and, therefore, does not remove ions from the water.
  • turbidity is taken to mean the presence of precipitated particles of calcium or magnesium salts in suspension in a liquid, not being adhered to any surface.
  • dispenser is taken to mean any system that allows a substance to be placed in the water in known doses.
  • devices and facilities for the administration of water is taken to mean any system used for domestic or industrial water supplies, including but not limited to ducts, pipes, wells, cisterns, household electrical appliances or tanks in which the water is stored temporarily.
  • Figure 1 shows the inhibiting effect of phytate on the crystallisation of salts in a sample of synthetic water having a concentration of calcium lower than 300 mg/L and a concentration of carbonate of 350 mg/L.
  • concentrations of phytate used were: 0 mg/L ( ⁇ ) , 1 mg/L
  • FIGS. 2 and 3 pertain to a chemical analysis of the water treated with phytate, showing that at increasing concentrations of phytate the concentration of calcium and carbonate in solution was greater, thereby demonstrating that phytate added to the water prevents crystallisation of the calcium salt.
  • the general objective of this invention is to prevent the formation of calcium carbonate and other salts that may coprecipitate in cisterns, wells, pipes, ducts, household electrical appliances and taps, as well as other points that frequently undergo deposits of precipitates of calcium carbonate and other salts along the water- circulation route and that give rise to deterioration and poor functioning of said installations and devices, with the expense involved for the consumer in repairing and/or replacing them.
  • the object of this invention is the use of phytate to inhibit nucleation and growth in the water of salts with one divalent cation selected from calcium and magnesium.
  • said salt with one divalent cation is calcium carbonate.
  • the objective of incorporating phytate is to prevent the formation of precipitates of calcium carbonate and of other calcium and magnesium salts thanks to the inhibiting action of the phytate on crystallisation.
  • nucleation this is the first of the crystallisation stages and consists in the formation of groups of atoms, molecules or ions that constitute a new solid phase. Until these groupings attain a certain critical size (10-100 structural units) they are not stable and dissociate again, leaving the free ions in solution. However, when due to the successive incorporation of atoms, molecules or ions that critical size is reached, a minimum stable core (nucleus) is said to have formed.
  • nucleation There are two types of nucleation: a.l.
  • Homogeneous nucleation this is the formation of a solid within a solution as a consequence of its supersaturation, i.e.
  • Heterogeneous nucleation it corresponds to the formation of a solid within a solution on the surface of a pre-existing solid particle of chemical composition different from that of the solid undergoing formation;
  • Crystalline growth once nucleation has taken place, the nucleus formed grows by successive incorporation of atoms, molecules or ions.
  • the phytate acts kinetically, preventing nucleation and growth (the initial stages of crystallisation) .
  • the phytate owing to its affinity for divalent cations, among them calcium, is adsorbed on the crystalline nucleus under formation or on the growing crystal, preventing or delaying its formation (initial stages (a) and (b) ) .
  • the addition of phytate does not alter the mineral composition of the water and moreover, advantageously, a natural product (the phytate) is incorporated in very small amounts and has many properties that are beneficial for the health.
  • the objective is to carry out what is known as "water softening" (i.e. acting on the supersaturation) .
  • the objective is to remove the ions responsible for the formation of precipitates in the water (carbonate, sulphate, calcium, magnesium, etc) .
  • the removal of said ions involves the loss of other mineral elements essential for the organism. This aspect is of particular importance in the case of water for human consumption.
  • the water treatment of the state of the art act on the level of supersaturation, so that the ions responsible for the formation of a solid are either removed or sequestered (as it happens if complexants such EDTA are used) , and those that act kinetically prevent secondary aggregation (the last stage of the process of formation of crystals) .
  • the crystallisation of calcium salts is prevented by inhibiting nucleation (homogeneous or heterogeneous) by using very small amounts of product, leaving the concentration of other essential mineral elements present in the water undiminished.
  • nucleation homogeneous or heterogeneous
  • the amount of phytate is less than 10 mg per litre of water to be treated.
  • the amount of phytate ranges between 0.1 and 5 mg per litre of water to be treated.
  • said phytate is used in an amount that ranges between 0.1 and 2 mg of phytate per litre of water to be treated.
  • 1 mg/L of phytate completely prevents crystallisation of the calcium carbonate when the concentrations of calcium were less than 300 mg/L (see Figure 1) and the concentration of carbonate was 350 mg/L.
  • a hard drinking water contains ranges of calcium of 100-120 mg/L and of carbonate of 200-500 mg/L.
  • the recommended pH ranges are 6.5-8.5, but the maximum permitted value is 9.5.
  • the phytate is supplied to the water to be treated in a dispenser for household or private use.
  • this invention relates to a dispenser that contains myo-inositol hexaphosphate for preventing the formation of precipitates of calcium carbonate and of other calcium or magnesium salts within devices and installations for the administration of water.
  • this invention relates to a detergent composition that contains myo-inositol hexaphosphate for preventing the formation of precipitates of calcium carbonate and of other calcium or magnesium salts within devices and installations for the administration of water.
  • Each solution was prepared in such a way as to contain 0,1 or 2 mg/L of phytate. 15 seconds after preparation of the water, turbimetry measurements were taken using a photometer (Metrohm 662) equipped with a reflector optic fibre cell of optical pitch 2 x 10 mm and using monochromatic light (550 nm) . The crystallisation processes were carried out at 25°C and the pH of all the solutions was adjusted to 9.8. Figure 1 shows the results obtained. As it can be observed, at a concentration of 1 mg/L of phytate the crystallisation of the calcium carbonate was prevented completely when the concentration of calcium was lower than 300 mg/L and the concentration of carbonate was 350 mg/L.
  • Synthetic water (see table of Example 1) (a) was made to circulate for 48 hours (30 0 C) and (b) for 24 hours
  • the phytate is equally effective at moderate temperatures (30 0 C) as it is at high temperatures (65°C). This aspect is of particular significance in the case of household electrical appliances (such as washing machines), and pipes, etc., through which hot water circulates.
  • the test was carried out with a 10000 L capacity tank with the inner walls coated with a layer of cement. This tank is used to supply three families, and under normal conditions is refilled on a weekly basis. The tank was filled regularly from a natural well and phytate added so that the concentration inside the tank would be in the 0-1 mg/L range. During the week of use of each concentration of phytate, the remains of precipitates of calcium carbonate in the house taps and bathroom accessories were evaluated qualitatively. Moreover, 48 hours after filling the tank a sample of water was taken from a tap of one of the three families and a quantitative determination of the pH, calcium and bicarbonates was carried out.
  • detergents can also be used in order to incorporate phytate in water, with the purpose that the final concentration of phytate in water (not in the detergent) is around 10 mg/ml, preferably lower than 5 mg/ml and, especially, between 0,1 and 2 mg/ml.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

L'invention concerne l'utilisation de phytate pour inhiber la nucléation et la croissance dans l'eau de sels avec un cation divalent sélectionné parmi Ca2+ et Mg2+. Cette opération consiste à utiliser de très petites quantités de produit. Elle permet d'éviter la cristallisation de sels de calcium et de magnésium, sans réduire la concentration d'autres éléments minéraux essentiels présents dans ladite eau.
EP06807037A 2005-10-14 2006-10-06 Utilisation de phytate pour le traitement de l'eau Withdrawn EP1966096A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200502507A ES2272191B1 (es) 2005-10-14 2005-10-14 Utilizacion del fitato para el tratamiento del agua.
PCT/EP2006/067135 WO2007042475A2 (fr) 2005-10-14 2006-10-06 Utilisation de phytate pour le traitement de l'eau

Publications (1)

Publication Number Publication Date
EP1966096A2 true EP1966096A2 (fr) 2008-09-10

Family

ID=37564259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06807037A Withdrawn EP1966096A2 (fr) 2005-10-14 2006-10-06 Utilisation de phytate pour le traitement de l'eau

Country Status (3)

Country Link
EP (1) EP1966096A2 (fr)
ES (1) ES2272191B1 (fr)
WO (1) WO2007042475A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102502977B (zh) * 2011-11-01 2014-12-31 梁颖然 一种阻垢制品以及阻止水垢生成的方法
GB201820465D0 (en) * 2018-12-14 2019-01-30 Bp Exploration Operating Co Ltd Layered double hydroxide materials as additives for enhancing scale squeeze chemical treatment lifetime

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2626238A (en) * 1947-03-17 1953-01-20 Corn Prod Refining Co Conditioning water
US4386005A (en) * 1981-01-06 1983-05-31 Chemical Sciences, Inc. Scale inhibitor for reverse osmosis water purification system
JPS5842773A (ja) * 1981-09-07 1983-03-12 Furukawa Electric Co Ltd:The 給水給湯方法
US4668293A (en) * 1986-02-24 1987-05-26 S. C. Johnson & Son, Inc. Phytate corrosion inhibitor system
US4804476A (en) * 1987-10-23 1989-02-14 Calgon Corporation Process for controlling calcium oxalate scale over a wide pH range
CN1141964A (zh) * 1995-02-10 1997-02-05 冯广新 一种金属表面防锈处理剂及其使用方法
US5853034A (en) * 1995-08-04 1998-12-29 Ecolab Inc. Dispensing system and method for dispensing a concentrated product and container for use therewith
US20030213503A1 (en) * 2002-05-17 2003-11-20 The Procter & Gamble Company Signal-based electrochemical methods for automatic dishwashing
ES2232302B1 (es) * 2003-11-07 2006-08-01 Universitat De Les Illes Balears Myo-inositol hexafosfato para uso topico.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007042475A3 *

Also Published As

Publication number Publication date
WO2007042475A2 (fr) 2007-04-19
WO2007042475A3 (fr) 2007-06-07
ES2272191A1 (es) 2007-04-16
ES2272191B1 (es) 2008-04-01

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