RU94025036A - Method for producing normal butyl lithium - Google Patents

Abstract

FIELD: organic synthesis. SUBSTANCE: proposed method is carried out in two steps, in hydrocarbon solvent medium, by reacting normal butyl chloride with dispersed lithium metal. First process step is carried out at temperature 0-60 C, and second step is followed by curing reaction mass at 65-90 C. Normal butyl lithium is synthesized in first process step at molar ratio normal butyl chloride-to-lithium equal to 0.65-0.85 of stoichiometrically required ratio. Resulting reaction products are separated. Unreacted lithium is recycled back to synthesis conducted at same molar ratio of components. Resulting butyl lithium solution isolated by separation is directed to second synthesis step which is completed by adding portion of butyl lithium solution and remaining quantity of butyl chloride. Synthesis during first process step is effected by continuous circulation of reactions mass through cooler. Normal butyl chloride is metered out with mass velocity of (0.25-2.5) h* in relation to lithium and introduced into reactor, preferably, at point having lowest temperature. Method can be used for production of lithium organic compounds, in particular alkyl lithium ones used as monomer polymerization initiators in production of rubbers and thermoelastoplastics. EFFECT: cheaper and simpler method for synthesis of lithium organic compounds.

Claims (1)

The invention relates to the production of organolithium compounds, in particular alkyl lithium compounds, used as initiators for the polymerization of monomers in the production of rubbers and thermoplastic elastomers. The proposed method for producing butyllithium, carried out in two stages in a hydrocarbon solvent, by the interaction of normal butyl chloride with a dispersion of lithium metal at a temperature of 0-60 ^o C in the first and second stages, followed by exposure of the reaction mass at 65 - 90 ^o C, based on the synthesis of normal butyl lithium in the first stage with a molar ratio of normal butyl chloride: lithium equal to 0.65 - 0.85 of the stoichiometrically necessary, the obtained reaction products are subjected to separation, unreacted lithium under The synthesis of the butyl lithium solution separated during separation is sent to the second synthesis stage, which is completed after the second part of the butyl lithium solution and the remaining amount of normal butyl chloride are added, the synthesis in the first stage being carried out by continuous circulation of the reaction mixture through a refrigerator and normal butyl chloride is dosed with respect to lithium at a mass rate of 0.25-2.5 h ^-1 and is introduced, preferably, at the point with the lowest temperature.