洗涤剂用层状硅酸盐钙、镁结合能力测定方法及影响因素的探讨

近年来 ,由禁磷活动所引发的代磷助洗剂的不断开发和生产 ,紧接 4A沸石之后的又一新型代磷助洗剂———层状硅酸盐 ,就是其中一种较好的助洗剂。对洗涤助剂层状硅酸盐的Ca、Mg结合能力测定的影响因素做了正交实验 ,其结果表明 ,对Ca、Mg结合能力影响最大因素为温度 ,其次为pH值     

Thermodynamic Modeling of Phase Diagrams in Binary Alkali Silicate Systems

A thermodynamic modeling of phase diagrams in binary alkali silicate systems is described by using the Gibbs free energy of the phases. Simple models employing regular, quasi-regular, and subregular solution models were applied to describe the liquid phase. The interaction parameters of the liquid phases were obtained by using the liquidus curves of silica (and subliquidus data) through a multiple linear regression method. The present calculated liquidus curves agree very well with Cs₂O—SiO₂ and Rb₂O—SiO₂ systems. In the K₂O—, Na₂O—, and Li₂O—SiO₂ systems, the calculations permitted discrimination between sets of data and, based upon the calculation choices, could be correctly made to select the most appropriate phase diagram. Also, the spinodals were calculated where phase separation can occur by a spinodal decomposition process.     

Microwave assisted synthesis of ETS-10

Engelhard Titanium Silicate-10 (ETS-10) has attracted interest for gas adsorption, catalysis, separations and ion-exchange. The practical application of ETS-10 would benefit from improvements in the synthesis. In this paper we present a 30 h microwave assisted synthesis at 230 °C which can be compared with the 72 h required by conventional heating. The effects of different titanium precursors, pH, heating time, and organic templates on ETS-10 were also investigated.     

Spheres of Microporous Titanosilicate Umbite with Hierarchical Pore Systems

Micrometric polycrystalline spheres of up to 1 mm diameter of microporous titanosilicate K₂TiSi₃O₉·H₂O with umbite structure have been prepared without the use of organic structuring agents. These spheres are organized as micro/macroporous hierarchical materials with macropores in the 0.2–1.4 µm range of average size, showing that intraparticular resistance to water transport is not limiting. Also, similar ion exchange performance can be observed in the Ti‐umbite spheres and in the single crystals obtained under the same synthesis conditions.