Sodium pyrosilicate → Sodium orthosilicate

HRID 2395223Notes

Reaction equation

HRID 2395223 reaction equation
[Si:1]([O:5][Si]([O-])([O-])[O-])([O-:4])([O-:3])[O-:2].[Na+:10].O.[Na+].[Na+].[Na+].[Na+].[Na+].[Si](O[Si]([O-])([O-])[O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+]>O>[Si:1]([O-:5])([O-:4])([O-:3])[O-:2].[Na+:10].[Na+:10].[Na+:10].[Na+:10]

Participants

4

Reactant 2

HCID 61803Sodium pyrosilicateHCID 86745547HCID 86745547, compound

Product 1

HCID 26051Sodium orthosilicate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent4×

Procedure

EP-A-0 444 415 proposes detergents containing 5 to 50% by weight of at least one surfactant, 0.5 to 60% by weight of a builder and typical detergent ingredients, characterized in that an amorphous low-water sodium disilicate with a water content of 0.3 to 6% by weight is used as the builder. In a preferred embodiment, the amorphous sodium disilicate is said to contain 0.5 to 2% by weight of water. These substantially water-free amorphous disilicates are produced by a multistage process which initially comprises producing a powder-form amorphous sodium silicate with a water content of 15 to 23% by weight. This material is treated with waste gas in countercurrent in a rotary kiln at temperatures of 250° to 500° C. The amorphous sodium disilicate issuing from the rotary kiln is size-reduced by a mechanical crusher to particle sizes of 0.1 to 12 mm and subsequently ground in a mill to particle sizes of 2 to 400 μm.

Workup

  1. additioncontaining 5 to 50% by weight of at least one surfactant, 0.5 to 60% by weight of a builder and typical detergent ingredients

Sources & evidence

ORD record
ord-55ce9053788c46748c72f3e186561df7
Source dataset
uspto-grants-1998_09
Patent number
US05814597

Reaction notes

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