METHOD FOR PREPARING DIDECYLDIMETHYL AMMONIUM BROMIDE Russian patent published in 2007 - IPC C07C211/63 C07C209/12 

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to a method for synthesis of didecyldimethyl ammonium bromide. Method involves interaction of decyl bromide with dimethylamine with addition of inorganic base aqueous solution. Decyl bromide is stirred with dimethylamine at room temperature for 45 min, not less, followed by heating the reaction mixture to temperature (92 ± 2.0)⁰C at the rate 1.5⁰C/min, not above, and adding an inorganic alkaline reagent solution at the rate (0.85-1.0) dm³/min. Reaction is carried out in the mass ratio of reagents = 1:(0.1-0.12):(0.11-0.13), respectively to obtain organic layer that is separated and purified by treatment with an inorganic acid extractant. Stirring is carried out at room temperature for 60 min and reaction mixture is heated to 94⁰C at the rate 0.8⁰C/min by addition of an alkaline reagent solution at the rate 0.85 dm³/min. Decyl bromide, dimethylamine and inorganic alkaline reagent are taken preferably in the mass ratio = 1:0.11:0.12, respectively. In purification of didecyldimethyl ammonium bromide sulfuric acid aqueous solution is used as acid extractant.

EFFECT: improved method of synthesis.

5 cl, 5 tbl, 1 ex