Influence of π-complexing agents on the anionic polymerization of styrene with lithium as counterion in cyclohexane. All rights reserved. Potassium, boron and the bulk of the calcium are rejected by tetrahydrofuran. All Rights Reserved. Most often, the solvent is a liquid, which can be a pure substance or a mixture. Other methods include placing the tetrahydrofuran in an evacuated chamber at 25° C. and allowing the liquid to evaporate. 1-516-662-5404 Generally, the process provides for drying the lithium chloride-calcium chloride-containing solution to obtain a dry lithium chloride-calcium chloride residue, preferentially dissolving the lithium chloride from this residue in tetrahydrofuran (THF), removing the insoluble calcium chloride from the tetrahydrofuran solution, and evaporating the tetrahydrofuran to recover the substantially pure solid lithium chloride.,,,,,,,,,,,, Precious Metal Catalysts Recovery and Refining. Martin Oestreich, Gertrud Auer, Manfred Keller. This has always been difficult since the solubilities of lithium compounds and calcium compounds are very similar in a number of solvents. For example, a solution of tetrahydrofuran containing 24 g of lithium chloride per liter will dissolve 3.6 g of calcium chloride per liter. Fax: 1-516-927-0118 API Research & Development Synthesis of water-soluble poly[oligo(ethylene glycol) methacrylate]s by living anionic polymerization of oligo(ethylene glycol) vinyl ether methacrylates. (1) An aluminum salt is added to a lithium-containing brine, and the pH is increased to the alkaline range with a base to form a precipitate. A test was conducted to determine the effect of hydration on the solubility of lithium chloride and calcium chloride in tetrahydrofuran. The structure of LiCl in tetrahydrofuran (THF) solution and its effect on the structure and stability of active sites of the anionic polymerization of methyl methacrylate (MMA) and styrene (St) was studied using the quantum-chemical density functional theory (DFT) approach. 3,537,813 to Nelli et al. The maximum solubility of lithium chloride in tetrahydrofuran is 54 g/l. These brines contain mixtures of salts and various metals, which metals include Na, Ca, Li, Mg, K, and B. Table II shows the mass distribution of the metals: The high level of lithium in the residue is due to the tetrahydrofuran being almost saturated with lithium chloride. A Novel Efficient Ligand in Anionic Polymerization at Elevated Temperature. Recently, Def-fieux and coworkers13 described the reactions of ... solubility of lithium chloride in benzene solution. Lithium Diisopropylamide-Mediated Ortholithiation of 2-Fluoropyridines: Rates, Mechanisms, and the Role of Autocatalysis. generation, Extraction of metals from mixtures of oxides or silicates, Process for purification of lithium chloride, Preparation and purification of lithium chloride, Production of lithium chloride from spodumene, Recovery of lithium values from lithium bearing ores, <- Previous Patent (Process for recoveri...). That of calcium chloride in tetrahydrofuran is 0.2 g/l. DFT Study of the Effect of σ-Ligands on the Structure of Ester Enolates in THF, as Models of the Active Center in the Anionic Polymerization of Methyl Methacrylate. The insoluble residue contained 0.09 g of lithium chloride and 6.1 g of calcium chloride. Effect of lithium butoxide additives on the anionic propagation of polystyryllithium in ethereal solvents. The method is therefore time consuming and costly. Itaru Natori, Shizue Natori, Naoki Hanawa, Akitaka Nakamura, Jahg Taehee, Kenji Ogino.


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