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The Synthesis and Properties of High Pure δ Layered Sodium Disilicate

Synthese und Eigenschaften von hochreinem δ-Schicht-Natriumdisilikat
J.-X. Dong , L.-P. Li , H. Xu , F. Deng , G.-Y. Zhang , J.-P. Li and X.-J. Ai

Abstract

δ layered sodium disilicate (δ-Na2Si2O5) is a single layer silicate and has good properties as detergent builder. However, it is difficult to synthesize high pure δ-Na2Si2O5. In this paper, a feasible and simple technology was found by decreasing Na content in liquid sodium silicate (water glass). The crystalline time was short and no seed needed. The suitable synthesis conditions were Si/Na = 1.05–1.10, calcining at 720 °C for 5 minutes. The synthesis conditions are of industrial value. XRD and 29Si NMR data proved that synthesized samples were δ-Na2Si2O5 without impure phase. High pure δ-Na2Si2O5 exhibited good ions binding ability and reached 312 to 338 mg CaCO3/g.

Kurzfassung

δ-Schicht-Natriumdisilikat (δ-Na2Si2O5) ist ein Einschichtsilikat und besitzt gute Eigenschaften als Builder für Waschmittel. Allerdings ist es schwierig hochreines δ-Na2Si2O5 zu synthetisieren. In dieser Arbeit wurde eine praktikable und einfache Methode durch Abnahme des Na-Gehaltes in flüssigem Natriumsilkat (Wasserglas) gefunden. Die Kristallisationszeit war kurz und ein Kristallisationskeim war nicht erforderlich. Die geeignetesten Synthesebedingungen waren: Si/Na = 1.05–1.10, Kalzinierung bei 720 °C für 5 Minuten. Die Synthesebedingungen sind von industriellem Wert. Die XRD- und 29Si NMR-Daten belegen, dass es sich bei den synthetisierten Proben um δ-Na2Si2O5 ohne unreine Phase handelt. Hochreines δ-Na2Si2O5 zeigte ein gutes Ionenbindungsvermögen und erreichte 312 bis 338 mg CaCO3/g.


Jin-xiang Dong, Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, P. R. China, Tel.: 0086-351-6010550-8, Fax: 0086-351-6111178. E-mail:

Jin-xiang Dong, a professor of Taiyuan University of Technology, has been studying the application and synthesis of inorganic porous materials for 20 years.

Li-ping Li is reading for Master degree at Taiyuan University of Technology. Her research fields centred at character of layered silicate.

Hong Xu, a vice-professor of Taiyuan University of Technology, has been studying the application and synthesis of inorganic materials for 10 years.

Feng Deng, a researcher of Wuhan Institute of Physics and Mathematics, has been studying solid state nuclear magnetic resonance and mechanism research for molecular sieves and catalysts.

Gao-yong Zhang, a academician of Chinese engineering academy, has been engaged in surfactant research including the application and synthesis of surfactant, catalysis, chemical engineering and green chemistry.

Jin-ping Li, a professor of Taiyuan University of Technology, has been studying the hydrogen storage materials for 20 years.

Xuan-jun Ai worked at Wuhan Institute of Physics and Mathematics. His research fields centred at characterization of solid materials and determination of 1H chemical shift anisotropy tensor and 1H-13C distance in inorganic materials or polypeptides by solid-state NMR.


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Received: 2006-10-23
Published Online: 2013-04-02
Published in Print: 2007-02-01

© 2007, Carl Hanser Publisher, Munich

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