WO1992019557A1 - Limescale remover - Google Patents
Limescale remover Download PDFInfo
- Publication number
- WO1992019557A1 WO1992019557A1 PCT/GB1992/000785 GB9200785W WO9219557A1 WO 1992019557 A1 WO1992019557 A1 WO 1992019557A1 GB 9200785 W GB9200785 W GB 9200785W WO 9219557 A1 WO9219557 A1 WO 9219557A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition
- acid
- quaternary ammonium
- cationic surfactant
- ammonium salt
- Prior art date
Links
Classifications
-
- 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
- C02F5/12—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 nitrogen
- C02F5/125—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 nitrogen combined with inorganic substances
-
- 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
-
- 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
- C02F5/083—Mineral agents
-
- 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
- C02F5/12—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 nitrogen
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/025—Cleaning or pickling metallic material with solutions or molten salts with acid solutions acidic pickling pastes
Definitions
- This invention relates to a composition for removing deposits of scale and the like.
- Water hardness is a condition which results when rainwater percolates through rock formations such as limestone or chalk and dissolves inorganic salts, particularly calcium carbonate. Water which contains more than about 100 parts per million of calcium
- limescale When hard water evaporates the dissolved calcium carbonate is deposited on the adjacent surface in the form of tiny crystals. This is known as limescale. With time these limescale deposits can build up into quite a large size. Limescale is strongly bonded to the surfaces on which it is deposited and is difficult to remove. Well known examples of limescale deposits are the
- Limescale deposits can also occur when hard water is heated an example of this being the well known furring of kettles. Deposits can also be formed in washing machines and dishwashing machines.
- Limescale removers have been developed in order to deal with these problems. These are generally based on acid which will react with the deposited scale to form a salt which is more readily soluble in water than calcium carbonate and which can thus be washed away.
- limescale remover There are two main types of limescale remover.
- One type includes a strong acid (e.g. hydrochloric acid, sulphamic acid) so that the pH of the limescale remover composition is about 1.0 or less. As a result of this low pH such compositions have a thin, watery consistency since stable thickening systems have not been previously achievable.
- this type of limescale remover is quite effective it is difficult if not impossible to maintain contact between the limescale remover
- the other type of limescale remover includes a weak acid, (e.g. citric acid, acetic acid) resulting in a composition having a pH usually in the range of from 3 to 5. With such mild pH conditions such compositions can be easily thickened.
- a weak acid e.g. citric acid, acetic acid
- compositions may remain in contact with a non-horizontal surface to be treated for a longer time than the strong acid type of composition, they have a poor performance. Hence they must remain in contact with the surface being treated for a considerable time for example up to half an hour. Even quite viscous compositions cannot with certainty be expected to remain in contact for that length of time with non-horizontal surfaces, particularly vertical surfaces such as the sides of a bath or on a tap.
- the present invention has been made in order to deal with this problem.
- compositions for effectively removing deposits of scale and the like from horizontal and inclined surfaces comprising an acid, a cationic surfactant and a desolubiliser.
- thickener providing increased viscosity for example up to 800 cps (Brookfield RV3/25°). Compositions having a viscosity of this order will tend to "cling" to vertical and non-horizontal surfaces thus giving the necessary contact time for effective scale removal.
- the acid used in the composition may be one which is used in conventional limescale removers, such as mineral acids, e.g. sulphamic acids, hydrochloric acids, phosphoric acid and organic acids, e.g. acetic acid, hydroxyacetic, citric acid, lactic acid.
- mineral acids e.g. sulphamic acids, hydrochloric acids, phosphoric acid and organic acids, e.g. acetic acid, hydroxyacetic, citric acid, lactic acid.
- the preferred cationic surfactants are (higher alkyl) quaternary ammonium compounds (where higher alkyl means alkyl groups having from 8 to 30 carbons
- Particularly preferred quaternary ammonium compounds are the following: -
- R 2 is an acyclic aliphatic C 15 -C 22 hydrocarbon group.
- R 3 is a C 1 -C 4 saturated alkyl or hydroxyalkyl group, R 4 is selected from R 2 and R 3 and A is an anion,
- R 1 is an acyclic aliphatic C. t - _ C_ hydrocarbon group
- R 2 is a divalent alkylene group having 1 to 3 carbon atoms
- R 5 and R 8 are C 1 -C 4 saturated alkyl or hydroxyalkyl groups and A is an anion
- n is equal to 1 to about 5, R 1 , R 2 , R 5 and A- are as defined above;
- Component (i) examples include
- dialkyldimethylammonium salts such as ditallowdimethylammonium chloride, ditallowdimethylammonium
- component (ii) examples include
- R 1 is an acyclic aliphatic C 15 -C 17 hydrocarbon group.
- R 2 is an ethylene group, R is a methyl group, R 8 is a hydroxyalkyl group and A is a methylsulfate anion; these materials are available from Sherex Chemical Company under the trade names Varisoft (R) 222 and Varisoft (R) 110, respectively.
- a particularly preferred cationic surfactant is a compound of Formula II wherein R 2 is as defined above, R 3 is methyl and R 4 is also methyl.
- the quaternary ammonium salt (b) preferably
- composition comprises from 1% to 20%, more preferably 2% to 20% by weight of the composition herein.
- the weight ratio amine (a): quaternary ammonium salt (b) is in the range from 10:1 to 1:10, preferably from 3:1 to 1:3.
- di (higher alkyl) imidazolinium compounds are preferred for use in the invention, in particular the 1-(lower alkyl)-1-(higher alkyl)amidoethyl-2-(higher alkyl) imidazolinium compounds, where "lower alkyl” means alkyl having from 1 to 4 carbon atoms, and “higher alkyl” means alkyl having from 11 to 22 carbon atoms.
- the preferred desolubilisers are for example sodium xylene sulphonate and sodium cumene sulphonate.
- desolubiliser used are chosen having regard to the desired viscosity of the composition. However, amounts in the range 50.0 to 1.0% and 0.0 to 50% (by volume) respectively are preferred.
- composition of the invention may include the usual additives such as perfume, colourant and the like.
- a limescale remover composition was formulated as follows:-
- the composition had a viscosity of 200 cps
- surfactant and sodium xylene sulphonate and including 3.0% of emulsifier.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Detergent Compositions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK126493A DK126493A (en) | 1991-05-09 | 1993-11-08 | LIME REMOVER |
GB9323711A GB2273925B (en) | 1991-05-09 | 1993-11-09 | Limescale remover |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9110066.9 | 1991-05-09 | ||
GB919110066A GB9110066D0 (en) | 1991-05-09 | 1991-05-09 | Limescale remover |
ATPCT/GB91/01372 | 1991-08-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992019557A1 true WO1992019557A1 (en) | 1992-11-12 |
Family
ID=10694723
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/001372 WO1992019549A1 (en) | 1991-05-09 | 1991-08-12 | Limescale remover |
PCT/GB1992/000785 WO1992019557A1 (en) | 1991-05-09 | 1992-04-29 | Limescale remover |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1991/001372 WO1992019549A1 (en) | 1991-05-09 | 1991-08-12 | Limescale remover |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU8421991A (en) |
DK (1) | DK126493A (en) |
GB (1) | GB9110066D0 (en) |
WO (2) | WO1992019549A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5639722A (en) * | 1993-01-13 | 1997-06-17 | The Clorox Company | Acidic aqueous cleaning compositions |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9515203D0 (en) * | 1995-07-25 | 1995-09-20 | Procter & Gamble | Detergent compositions |
GB9805714D0 (en) | 1998-03-17 | 1998-05-13 | Kvaerner Construction Limited | Liquid effluent treatment process and plant |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435303A (en) * | 1983-01-03 | 1984-03-06 | Khodabandeh Abadi | Descaling composition |
EP0157552A2 (en) * | 1984-03-26 | 1985-10-09 | Calgon Corporation | Carboxylic/sulfonic/quaternary ammonium polymers for use as scale and corrosion inhibitors |
-
1991
- 1991-05-09 GB GB919110066A patent/GB9110066D0/en active Pending
- 1991-08-12 WO PCT/GB1991/001372 patent/WO1992019549A1/en unknown
- 1991-08-12 AU AU84219/91A patent/AU8421991A/en not_active Abandoned
-
1992
- 1992-04-29 WO PCT/GB1992/000785 patent/WO1992019557A1/en active Application Filing
-
1993
- 1993-11-08 DK DK126493A patent/DK126493A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4435303A (en) * | 1983-01-03 | 1984-03-06 | Khodabandeh Abadi | Descaling composition |
EP0157552A2 (en) * | 1984-03-26 | 1985-10-09 | Calgon Corporation | Carboxylic/sulfonic/quaternary ammonium polymers for use as scale and corrosion inhibitors |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5639722A (en) * | 1993-01-13 | 1997-06-17 | The Clorox Company | Acidic aqueous cleaning compositions |
Also Published As
Publication number | Publication date |
---|---|
AU8421991A (en) | 1992-12-21 |
GB9110066D0 (en) | 1991-07-03 |
DK126493A (en) | 1993-11-09 |
WO1992019549A1 (en) | 1992-11-12 |
DK126493D0 (en) | 1993-11-08 |
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