Lithium Silicates

Lithium Silicate. Lithium siUcate [10102-24-6], Li2Si02, is formed from calcination of lithium carbonate or hydroxide using finely ground... 

Sorbents such as lithium silicate and lithium zirconate can absorb C02 at somewhat lower temperature of 500°C (Kato et al., 2002 Li et al., 2006),... 

Kato, M., K. Nakagawa, T. Ohashi, S. Yoshikawa, and K. Essaki, Carbon Dioxide Gas Absorbent Containing Lithium Silicate, U.S. Patent No. 6,387845 Bl, May 2002. 

Li, W., S.K. Gangwal, R.P Gupta, and B.S. Turk, Development of Fluidizable Lithium Silicate-Based Sorbents for High Temperature Carbon Dioxide Removal, 2006 Pittsburgh Coal Conference, Pittsburgh, PA, September 2006. 

Lithium oxide(s), 15 134, 141 Lithium perchlorate, 3 417 15 141-142 dessicant, 3 360 in lithium cells, 3 459 Lithium peroxide, 15 142 18 393 Lithium phosphate, 15 142 Lithium-polymer cells, 3 551 in development, 3 43 It Lithium primary cells, 3 459-466 Lithium production, 9 640 Lithium products, sales of, 15 121 Lithium salts, 15 135-136, 142 Lithium secondary cells, 3 549-551 ambient temperature, 3 541-549 economic aspects, 3 551-552 high temperature, 3 549-551 Lithium silicate glass-ceramics, 12 631-632... 

Lithium-silicates, 12 577 15 142 22 452 in adhesives and binders, 22 472 solutions of, 22 465 Lithium soap greases, 15 243 Lithium sulfate, 15 142 Lithium-sulfur dioxide cells, 3 464-466 characteristics, 3 462t speciality for military and medical use, 3 430t... 

Both lithium and barium salts reduce expansion based on alkali-silicate and alkali-carbonate swelling through the osmotic pressure development mechanisms. Two theories have been postulated [5, 11]. According to the first mechanism, soluble metal silicates, formed by the attack of alkali hydroxides on silica, are said to convert to insoluble lithium silicates in the presence of lithium salts. Consequently, less water is imbibed and this results... 

The mechanism of the inhibitive action of LiOH proposed by Stark et al. [7] is attributed to the formation of lithium silicate that dissolves at the surface of the aggregate without causing swelling [7], In the presence of KOH and NaOH the gel product incorporates Li ions and the amount of Li in this gel increases with its concentration. The threshold level of Na Li is 1 0.67 to 1 1 molar ratio at which expansion due to alkali-silica reaction is reduced to safe levels. Some workers [22] have found that when LiOH is added to mortar much more lithium is taken up by the cement hydration products than Na or K. This would indicate that small amounts of lithium are not very effective. It can therefore be concluded that a critical amount of lithium is needed to overcome the combined concentrations of KOH and NaOH to eliminate the expansive effect and that the product formed with Li is non-expansive. 

Aldimines can be trifluoromethylated at the imine carbon using Me3SiCF3 in dimethyl formamide at —20 °C, using a lithium carboxylate as catalyst.71 It is proposed that the carbon-silicon bond of the reagent is activated via formation of a lithium silicate bearing carboxylate and DMF ligands on silicon. A similar process has been used for diastereoselective addition to sulftnylimims.12... 

Fig. 5.17. Si MAS NMR spectra of lithium silicate glasses and their decomposition to Gaussian components both in terms of the chemical shift (8 in ppm, with Gaussians shown as dotted lines on left-hand side above) and in terms of Si-O-Si bond angle (a) distribution (right-hand side above). Samples studied were (a) vitreous silica (b) 15 Li,0-85 SiOj glass (c) 33.3 LijO-bb. SiOj glass (d) 40 Li,O-60 SiO, glass (after Selvaray et al., 1985 reproduced with the publisher s permission).

Lithium Silicate minerals such as spodumene, LiAI(Si2Og) Electrolysis of molten LiCl... 

Bis(l-phenylpyrrole-2,2 -diyl)silane 31 was synthesized in 53% yield from 2-bromo-l-phenylpyrrole 175 in diethyl ether by treatment with 2 equiv of -butyllithium (0°C) and 0.5 equiv of SiCU (reflux) <1979JOM139> (Scheme 22). Reaction of 31 with methyllithium in THF at —78°C afforded a pale yellow solution of lithium silicate 25, as indicated by the upheld shift of the Si NMR signal at 5= —35 to —131 ppm (the NMR spectrum was recorded at —50°C to minimize signal broadening). 

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