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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
  • B01J2/30—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
• • 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
  • C11D3/04—Water-soluble compounds
  • C11D3/06—Phosphates, including polyphosphates
• • 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
  • C11D3/04—Water-soluble compounds
  • C11D3/08—Silicates

Definitions

• the invention relates to producing free-flowing, strong, discrete, granular particles that contain a mixture of a hydratable phosphate and a silicate, and which dissolve rapidly and completely in water.
• a sodium phosphate e.g., sodium tripolyphosphate
• these may include anionic or nonionic synthetic surfactants, antiredeposition agents, such as sodium carboxymethylcellulose, extenders, perfumes, bleaching agents, e.g., chlorinated cyanurates, alkaline cleansers, e.g., soda ash, caustic soda, and the like.
• anionic or nonionic synthetic surfactants such as sodium carboxymethylcellulose
• extenders perfumes
• bleaching agents e.g., chlorinated cyanurates
• alkaline cleansers e.g., soda ash, caustic soda, and the like.
• the above phosphate built detergent when used in conventional dishwashers or cleansing equipment, is known to be corrosive to both the metal and enamelware it contacts.
• an alkali metal silicate normally sodium silicate
• the added alkali metal silicate also increases the alkali content of the detergent formulation, thereby improving detergency and buffering it against acid soils removed during cleansing.
• This patented duplex mixture has certain drawbacks. Initially, it can only be formed with the less alkaline silicates, i.e., SiO /Na O weight ratios of 3.22:] to 2.40:1. Further, when high silica to phosphate mole ratios, e.g., at least 1:1, are desired in the mixture for optimum corrosion inhibition, only the less alkaline (SiO /Na O of 3.22:1) silicates can be employed to obtain the patentees duplex product.
• an alkali metal silicate preferably a sodium silicate having an SiO,/Na O weight ratio of below 2411
• an alkali metal silicate preferably a sodium silicate having an SiO,/Na O weight ratio of below 2411
• a hydratable alkali metal phosphate either in a granular form (-10 to +200 mesh) or powdered form (-100 mesh) is used as one of the feed reactants.
• the granular form is preferred, particularly in a predominantly -20 +100 mesh size range.
• the hydratable phosphate may be either sodium tripolyphosphate, u r o tetrasodium pyrophosphate, Nla P O trisodium orthophosphate, Na PO sodium trimetaphosphate, (NaPO or the corresponding potassium salts, namely, potassium tetrametaphosphate, (KPO L, or potassium pyrophosphate, K P O
• the preferred embodiment is sodium tripolyphosphate which is most popularly used in detergent mixes.
• a hydratable phosphate e.g., sodium tripolyphosphate
• a agitated reaction chamber such as a Hobart mixer, rotary drum or other agitated vessel, heated to a temperature of 60 to 100 C. (preferably 60to 75 C.), and maintained in a state of constant agitation.
• an alkali metal silicate preferably a potassium or sodium silicate solution having an SiO /M O weight ratio of below 2.40:1, wherein M is either sodium or potassium.
• An especially useful sodium silicate solution is the Philadelphia Quartz Company product D-brand silicate which contains 14.7 percent Na O; 29.4 percent SiO and 55.9 percent H O.
• the silicate solution is dispersed onto the heated bed of hydratable phosphate, preferably through spray nozzles or other line distributing means at a rate that does not cause the resulting mixture to become excessively sticky.
• Water is constantly evaporated from the resulting mixture to prevent the incoming alkali metal silicate solution from causing the discrete particles of the mixture to adhere into undesirably large aggregates.
• the resulting mixture remains dry-appearing without changing its granular form and without losing its discrete, particulate character.
• a major portion of the granular product that is recovered is in the desired l0 mesh range when starting with the preferred -20 mesh, granular, hydratable phosphate. If a finer hydratable phosphate feed is used, i.e., a powdered phosphate, the resulting product will contain some undersized particles, that is, smaller than 80 mesh.
• any undersized particles are recycled back to the agitated bed of hydratable phosphate to be further processed until it is of suitable product size.
• Oversize particles, if any, can be crushed so that the desired product size, l +80 mesh, is separated, and any undersized fraction is recycled to the agitated, hydratable phosphate bed for further processing.
• a sodium silicate solution such as the D-brand silicate which contains about 55 percent water can be used as received from the manufacturer and added directly to the sodium tripolyphosphate.
• sufficient water may be added to the silicate solution to reduce the viscosity of the solution to a suitable, workable level.
• the added water permits the silicate solution to be more readily dispersed throughout the bed of hydratable phosphate.
• the addition of excessive amounts of water is undesirable because this water must be evaporated from the mixture and increases the reaction time and heat input required to prepare the final product.
• Si0 to sodium tripolyphosphate mole ratio at a level of at least 1:1 in order to provide good corrosion inhibition.
• This and higher mole ratios of silicate to sodium tripolyphosphate are sufficient to materially reduce or eliminate undue corrosion of metal equipment that contacts the present silicate-phosphate product when it is incorporated in a final detergent formulation. Examples of some sodium silicate solutions which have been found effective in the present invention are listed below:
• EXAMPLE 1 dropwise at a rate of about 0.2 gram/minute. Water was continuously evaporated from the mixture during the run. The rate of addition of the silicate solution was controlled by observing the mixture; if the discrete particles of the mixture commenced to adhere into undesirably large aggregates, the
• EXAMPLE 2 The procedure of example 1, run 1, was repeated, except that Kasil 88," a proprietary product containing 9.1 weight percent K 0, 19.9 weight percent SiO and 71 weight percent H O was used in place of the sodium silicate solution.
• Kasil 88 a proprietary product containing 9.1 weight percent K 0, 19.9 weight percent SiO and 71 weight percent H O was used in place of the sodium silicate solution.

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

Applications Claiming Priority (1)

Publications (1)

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ID=24908197

Family Applications (1)

Country Status (11)

Cited By (11)

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Citations (2)

• 1968
  • 1968-04-24 US US723907A patent/US3620979A/en not_active Expired - Lifetime
• 1969
  • 1969-03-31 GB GB06661/69A patent/GB1241393A/en not_active Expired
  • 1969-04-10 FR FR6911148A patent/FR2006800A1/fr not_active Withdrawn
  • 1969-04-11 BE BE731431D patent/BE731431A/xx unknown
  • 1969-04-15 DE DE19691919093 patent/DE1919093A1/de active Pending
  • 1969-04-18 BR BR208202/69A patent/BR6908202D0/pt unknown
  • 1969-04-22 JP JP44030826A patent/JPS4831472B1/ja active Pending
  • 1969-04-23 NL NL6906300A patent/NL6906300A/xx unknown
  • 1969-04-23 SE SE5808/69A patent/SE345138B/xx unknown
  • 1969-04-24 CH CH624369A patent/CH533169A/de not_active IP Right Cessation
  • 1969-04-24 ES ES366406A patent/ES366406A1/es not_active Expired

Patent Citations (2)

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