EP0743977A1 - Körniges builderprodukt - Google Patents

Körniges builderprodukt

Info

Publication number
EP0743977A1
EP0743977A1 EP95907745A EP95907745A EP0743977A1 EP 0743977 A1 EP0743977 A1 EP 0743977A1 EP 95907745 A EP95907745 A EP 95907745A EP 95907745 A EP95907745 A EP 95907745A EP 0743977 A1 EP0743977 A1 EP 0743977A1
Authority
EP
European Patent Office
Prior art keywords
product
bicarbonate
silicate
alkali metal
builder salt
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.)
Ceased
Application number
EP95907745A
Other languages
English (en)
French (fr)
Inventor
Malcolm John Thorpe
Philip George Hughes
Alan Keith Mcclellan
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.)
Imperial Chemical Industries Ltd
Colin Stewart Minchem Ltd
Original Assignee
Brunner Mond and Co Ltd
Colin Stewart Minchem Ltd
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 Brunner Mond and Co Ltd, Colin Stewart Minchem Ltd filed Critical Brunner Mond and Co Ltd
Publication of EP0743977A1 publication Critical patent/EP0743977A1/de
Ceased 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
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • C11D11/0082—Special methods for preparing compositions containing mixtures of detergents one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads
    • C11D11/0088—Special methods for preparing compositions containing mixtures of detergents one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads the liquefied ingredients being sprayed or adsorbed onto solid particles
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/10—Salts
    • C11D7/12—Carbonates bicarbonates
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/10—Salts
    • C11D7/14—Silicates

Definitions

  • the present invention relates to a granular product intended for use particularly, but not exclusively, as a builder in a powdered or granular detergent formulation, e.g. of the type used in domestic washing or dishwashing machines.
  • powdered and granular detergent products (hereinafter referred to generically as granular detergent products) to incorporate a builder to sequester or precipitate divalent metal ions (e.g. Ca 2+ and Mg 2+ ) so that they do not interfere with the properties of the surfactant.
  • the builder may be provided in the form of a co-granule produced by agglomeration of a solution of an alkali metal silicate (typically sodium silicate) and a builder salt (e.g. sodium carbonate) .
  • Examples of such co-granules are disclosed in U.K. Patent No. 1,396,215 (Diamond Shamrock) and their use as builders is described in European Patent Application No. 91403173.7 (Rhone Poulenc) .
  • An example of a sodium silicate/sodium carbonate co-granule made using this prior process typically contains 27% sodium silicate expressed as disilicate, 54% sodium carbonate of which about is present as monohydrate and about 19% total water. (Unless otherwise stated all percentages referred to herein are by weight).
  • detergent formulaters would prefer co- granules containing at least 28%, more preferably at least 30%, and most preferably at least 32% of sodium silicate.
  • a granular product comprising co-granules of an alkali metal silicate and a builder salt wherein the granules contain an amount of a bicarbonate which is such that when the granular product is dissolved in distilled water as a 1% solution there is no observable opalescence.
  • the invention has been based on our discovery that the use of the bicarbonate readily allows higher amounts of silicate to be incorporated into the co-granule than can be achieved in prior art processes.
  • the bicarbonate allows greater quantity of sodium silicate solution to be used in the agglomeration process before the plastic point is reached.
  • the invention has the significant advantage that it renders possible the production of granules containing at least 28% of the alkali metal silicate (expressed as disilicate). This is obviously a considerable advance over the prior art processes and meets the needs of detergent for ulaters. It is not however essential that granules in accordance with the invention contain such high loadings of silicate since, even at lower silicate loadings the granules will still have utility as a builder.
  • the amount of bicarbonate used is such that there is no visually observable opalescence to the naked eye when the granule is dissolved as a 1% solution in distilled water.
  • the test for the presence of observable opalescence may be carried out by comparing a solution of the granule in distilled water with distilled water per se and comparing the two liquids for the presence of opalescence (e.g. as manifested by "cloudiness") in the former liquid.
  • granules in accordance with the invention are such that, as a 1% solution of the granule is distilled water, there is no substantial precipitation of silica or silicate, i.e. no visually observable particulate matter formed in the solution (e.g. as a suspended solid).
  • silica (such as gives rise to opalescence or precipitate formation) can arise as a result of the following reaction which occurs in solution
  • the OH " ions are derived from the silicate.
  • the precipitation of Si0 2 (or silicate) is obviously undesirable in a domestic laundry or dishwashing operation.
  • concentration of 1% in aqueous solution at which the granule will be used in a laundry or dishwashing solution there should be no opalescence or, more preferably, no substantial precipitation of silica or silicate.
  • the 1% level represents the industry standard. It is however more preferred that the amount of bicarbonate in the granules of the invention is such that there will be no opalescence, or more preferably, no substantial precipitation of silica (or silicate) at a concentration (of the granule) of 2% in aqueous solution. More preferably there should be no opalescence or, more preferably, no substantial precipitation at the 10% level, and even more preferably no precipitation up to the solubility limit of the granule.
  • co-granules in accordance with the invention will typically comprise
  • alkali metal silicate 25-35% (preferably 28-35%) (expressed as disilicate) bicarbonate 0.1-12% (preferably 0.5-8%) builder salt 30-55% (preferably 35-48%) water 10-30% (preferably 13-28%)
  • the invention may be used to produce co-granules having at least 30% alkali metal silicate (expressed as disilicate)
  • the alkali metal silicate of the granules is preferably, but not limited to, sodium silicate.
  • a further example of alkali metal silicate which may be used is potassium silicate.
  • the bicarbonate is most preferably an alkali metal bicarbonate, most preferably sodium bicarbonate.
  • the builder salt is most preferably an alkali metal carbonate (ideally sodium carbonate) but could for example be a phosphate or polyphosphate (e.g. sodium tripolyphosphate or trisodium phosphate), a borate or perborate (e.g. sodium borate or sodium perborate), a percarbonate (e.g. sodium percarbonate) , a metasilicate (e.g. sodium metasilicate) or sodium sulphate.
  • a phosphate or polyphosphate e.g. sodium tripolyphosphate or trisodium phosphate
  • a borate or perborate e.g. sodium borate or sodium perborate
  • Co-granules in accordance with the invention preferably have a mean particle size of 0.2-2.5 mm, more preferably 0.5-1.4 mm.
  • the granules preferably have a pouring density of 0.6-1.3 g cm “3 , more preferably 0.75-1 g cm “3 .
  • the present invention also provides a method of producing the co-granules comprising the steps of (i) dry blending the bicarbonate and builder salt, (ii) adding to the dry blend a solution of the alkali metal silicate;
  • the builder salt used in the process is preferably a hydratable salt, most preferably anhydrous sodium carbonate, which becomes at least partially hydrated during the agglomeration.
  • the builder salt and bicarbonate are of similar particle size. Preferably 75% of these particles have a size less than 180 microns.
  • the builder salt is 'light ash' (sodium carbonate) having a pouring density of 0.4-0.6 g cm -3 and the bicarbonate is sodium bicarbonate.
  • the alkali metal silicate preferably has a solids content of 28-55% (more preferably 45-55%) and a Si0 2 :M 2 0 ratio (where M is an alkali metal) of 1.6-3.5 (more preferably 1.6-2.5).
  • silicate solution Typically the silicate solution, builder salt and bicarbonate are used in the following relative amounts in the agglomeration process
  • silicate solution 45-60% builder salt 30-50% bicarbonate 0.1-15%
  • the weight ratio of bicarbonate:silicate (solids) will be less than 1:2.8, more preferably less than 1:3.5 most preferably less than 1:4.5.
  • Any conventional agglomerator may be used for the agglomeration process .
  • Material leaving the agglomeration may be graded through a suitable size mesh sieve to remove fines which are recycled to the agglomeration feed and through a coarser sieve to remove oversize products which can be crushed and recycled through the grading plant.
  • the graded product may then be dried (e.g. in a fluid bed drier, flash drier or similar) in a manner that prevents the solids temperature rising above 60°C.
  • Table 1 sets out the amounts of the various components used and the properties of the resultant products.
  • Examples 1-4 all illustrate products of the invention which contain at least 29% of silicate (expressed as disilicate) in the final co-granule.
  • Comparative Example 1 illustrates a conventional co-granule (i.e. no bicarbonate) in which the amount of silicate (expressed as disilicate) is 26%.
  • the product of Comparative Example 2 contains 28.5% silicate (expressed as disilicate) but the amount of bicarbonate present is such as to cause precipitation of silica when the co-granule is dissolved as a 2% solution.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)
EP95907745A 1994-02-07 1995-02-07 Körniges builderprodukt Ceased EP0743977A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9402301 1994-02-07
GB9402301A GB9402301D0 (en) 1994-02-07 1994-02-07 Granular builder product
PCT/GB1995/000245 WO1995021237A1 (en) 1994-02-07 1995-02-07 Granular builder product

Publications (1)

Publication Number Publication Date
EP0743977A1 true EP0743977A1 (de) 1996-11-27

Family

ID=10749985

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95907745A Ceased EP0743977A1 (de) 1994-02-07 1995-02-07 Körniges builderprodukt

Country Status (4)

Country Link
EP (1) EP0743977A1 (de)
AU (1) AU1584195A (de)
GB (1) GB9402301D0 (de)
WO (1) WO1995021237A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9504442D0 (en) * 1995-03-06 1995-04-26 Brunner Mond & Co Ltd Granular bleach/builder product

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821119A (en) * 1972-05-03 1974-06-28 Diamond Shamrock Corp Silicated soda ash
GB1575094A (en) * 1977-03-24 1980-09-17 Pennwalt Corp Detergent compositions
DE3825858A1 (de) * 1988-07-29 1990-02-01 Henkel Kgaa Phosphatarme buildersalzkombination
NL9000272A (nl) * 1990-02-05 1991-09-02 Sara Lee De Nv Hoofdwasmiddel.
DE69117270T2 (de) * 1990-11-30 1996-11-14 Rhone Poulenc Chimie Gerüststoff auf Basis von Alkalimetallsilikaten für Reinigungsmittelzusammensetzungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9521237A1 *

Also Published As

Publication number Publication date
WO1995021237A1 (en) 1995-08-10
AU1584195A (en) 1995-08-21
GB9402301D0 (en) 1994-03-30

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