Process for the preparation of crystalline sodium silicates
Patent 4585642 Issued on April 29, 1986. Estimated Expiration Date: 
May 9, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 9, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2795485 3377134 InventorApplicationNo. 06/732418 filed on 05/09/1985US Classes:423/333, By precipitating or gelling from silicate solution423/332Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Doll, JohnAssistant: Johnson, Lance Attorney, Agent or FirmInternational ClassesC01B 33/38 (20060101)C01B 33/00 (20060101) Foreign Application Priority Data1984-05-12 DEAbstractA process for the preparation of crystalline sodium silicates with a molar ratio SiO2 /Na2 O of 1.9:1 to 3.5:1 from amorphous sodium silicate is described. To water-containing amorphous sodium silicate with a molar ratio SiO2 /Na2 O of 1.7:1 to 3.75:1 and a water content of 5 to 95% by weight is added 0.01 to 30 parts by weight of the crystalline sodium silicate to be prepared (per 100 parts by weight of Na2 O+SiO2 in the water-containing amorphous sodium silicate).The reaction mixture is dehydrated by heating. The dehydrated reaction mixture is kept at a temperature of at least 450° C., but below the melting point, until the sodium silicate has crystallized. |
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