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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/128—Aluminium silicates, e.g. zeolites
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
  • C01B39/026—After-treatment

Definitions

• zeolite A has opened up further areas of application, such as as a builder in detergents.
• This new application places additional demands on the properties of the product.
• high whiteness e.g. Desired a small average particle diameter with a narrow grain spectrum. It is an important requirement that the product, regardless of the form in which it is present, shows the original distribution again when dispersed in water, that is to say that it has no irreversible agglomeration.
• the sodium aluminum silicate in the form of the filter dough which can be used as such in the production of detergents, has certain properties which are explained in more detail below.
• the filter dough produced in the manufacture of the sodium aluminum silicate after the mother liquor has been separated off and washed which generally contains 40-50% solids, shows a high structural viscosity in addition to other rheological anomalies. In general, this enables the dough to be pumped through without further dilution. Furthermore, due to the rheological properties mentioned, the dough can generally be stored in suitable containers and from there can be brought to flow again after the application of relatively low energy by stirring, shaking or pump suction.
• sodium sulfate not only has the advantage that it is an inexpensive component in the sodium aluminum silicate suspension is introduced, which is present in the detergent anyway, it also causes that when the dried product is dispersed in water, the sodium aluminum silicate is back in its original particle size distribution.
• Spray drying is normally used as a convenient form of further processing of the sodium aluminum silicate dough.
• spray drying has one disadvantage: the product is obtained in the form of prills.
• this inherently desirable property means that the original grain distribution in the dough does not re-establish with sufficient certainty when dispersed in water.
• the prills (30 - 80ju average diameter) often do not completely disintegrate into the original primary particles with a fineness of approx. 98 - 99% ⁇ 15 ⁇ corresponding to 95% ⁇ 10 ⁇ . This phenomenon is remedied by the addition of sodium sulfate.
• the filter dough maintained its advantageous consistency, possibly via the ge entire observation period of eight weeks. In particular, no tough, non-pumpable, non-stirrable soil body occurred. Even an addition of 1% Na 2 so 4 , based on the solid dough after the addition, already shows an effect. In practice, the addition of 2% sodium sulfate represents the lower limit. With increasing Na 2 SO 4 concentration, the effect of sodium sulfate initially increases, so that additions of 2 to 10% are expedient to improve the rheological properties. If the addition was increased by more than 10% up to 25%, based on the total solids, no rheological disadvantages were found.
• additives of more than 10%, preferably of 15-20%, based on the total solids present are required. If filter dough with N a 2 S0 4 contents of more than 10% up to approx. 25%, based on solids, is subjected to spray drying, the resulting dry products, after dispersion in water, show an extensive approximation to the original grain spectrum when determining the grain size.
• the sodium sulfate can be added at any stage in the manufacturing process of sodium aluminum silicates as long as the type of addition does not structurally change the sodium aluminum silicate itself. Furthermore, care must of course be taken that it is not removed again in a subsequent washing process. So it is e.g. It does not matter whether the sodium sulfate is already present when the sodium aluminum silicate is precipitated, i.e. whether it is added to the alkali silicate and / or the alkali aluminate solution or whether it is added during the subsequent annealing phase. It can also be added to the washed filter dough.
• the sodium sulfate can also be introduced during the washing process, which is carried out for the purpose of lowering the pH, by completely or partially neutralizing the sodium hydroxide which is in the wash water, which is expediently conducted in countercurrent, with sulfuric acid.
• the amount of sodium sulfate introduced in this way is generally not sufficient to improve the properties of sodium aluminum silicate doughs and powders, and further addition of sodium sulfate is required. Because of the exact dosage of sodium sulfate, an additional addition is usually necessary.
• the particle size distribution was carried out after dispersing in water (10 g of product; 700 ml of H 2 O; 60 min. Stirring at 1000 rpm) according to the Andreasen method.
• Example 2 In another part of the dough produced according to Example 1, after washing, 10 g of solid Na 2 SO 4 , corresponding to 2.4% of the amount of solids present in the dough, were mixed in per 1 kg of dough. The dough was also placed in a 200 liter jar to a filling height of 60 cm and observed as in Example 1. The simple tests, slowly tilting the container 45 °, inserting the stick, showed that after 7 days the dough was still homogeneous. After that, the phenomena that began to appear in a dough without Na 2 S0 4 addition began to appear.
• Example 1 In a further part of the dough produced according to Example 1, 100 g of solid Na 2 SO 4 were mixed in per 1 kg of dough, which corresponded to approximately 20% of the total amount of solids. The dough was observed when stored in the 200 liter jar with a filling height of 60 cm. In terms of flowability, the dough showed the same behavior as that in Example 3.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Detergent Compositions (AREA)
• Silicates, Zeolites, And Molecular Sieves (AREA)

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Cited By (7)

Citations (4)

• 1977
  • 1977-08-24 DE DE19772738085 patent/DE2738085A1/de not_active Withdrawn
• 1978
  • 1978-07-25 EP EP78100496A patent/EP0000870A1/fr not_active Withdrawn
  • 1978-08-22 IT IT26914/78A patent/IT1098273B/it active
  • 1978-08-23 DK DK371378A patent/DK371378A/da unknown
  • 1978-08-23 AT AT615178A patent/ATA615178A/de not_active Application Discontinuation
  • 1978-08-23 NO NO782864A patent/NO782864L/no unknown

Patent Citations (4)

Non-Patent Citations (1)

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