Quaternary ammonium hydroxide compositions and preparation thereof
AssigneeLonza Ltd.
InventorLeigh E. Walker
Life of this patent
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Abstract
A high yield method for the preparation of C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.16 alkyl quaternary ammonium-hydroxide is provided whereby two reactants, a corresponding quaternary ammonium chloride and a metal hydroxide, are reacted in a solvent comprising a C.sub.1 -C.sub.4 normal alcohol. The amount of metal hydroxide reactant is that amount sufficient to yield the quaternary ammonium hydroxide and a metal chloride. Also provided are wood preservative systems which include (a) a biocidal effective amount of at least one di C.sub.8 -C.sub.12 alkyl quaternary ammonium hydroxide and (b) a solvent, as well as a method for preserving a wood substrate whereby the substrate is treated with the preservative system.
Claims15
A method for the preparation of C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide, said method comprising
- (a) reacting a C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium chloride reactant and a metal hydroxide reactant in a solvent comprising a C.sub.1 -C.sub.4 normal alcohol, said metal hydroxide being present in an amount sufficient to yield said C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide;
- and
- (b) removing any excess metal hydroxide by reacting with carbon dioxide.
A method for the preparation of di C.sub.8 -C.sub.12 alkyl quaternary ammonium hydroxide, said method comprising
- (a) reacting a di C.sub.8 -C.sub.12 alkyl quaternary ammonium chloride reactant and a metal hydroxide reactant in a solvent comprising a C.sub.1 -C.sub.4 normal alcohol, said metal hydroxide being present in an amount sufficient to yield said di C.sub.8 -C.sub.12 alkyl quaternary ammonium hydroxide.
A method for the preparation of didecyldimethylammonium hydroxide, said method comprising
- (a) reacting didecyldimethylammonium chloride and potassium hydroxide in ethanol, said potassium hydroxide being present in at least a stoichiometric amount with respect to said didecyldimethylammonium chloride;
- and
- (b) removing any excess metal hydroxide by reacting with carbon dioxide.
A method for the preparation of C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide, said method comprising
- (a) reacting a C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium chloride reactant and a metal hydroxide reactant in a solvent comprising a C.sub.1 -C.sub.4 normal alcohol, said metal hydroxide being present in an amount sufficient to yield said C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide wherein the weight ratio of quaternary ammonium chloride to solvent is about 1.1:1;
- and
- (b) removing any excess metal hydroxide by reacting with carbon dioxide.
A method for the preparation of C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide, said method comprising
- (a) reacting a C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium chloride reactant and a stoichiometric amount of potassium hydroxide in a solvent comprising a C.sub.1 -C.sub.4 normal alcohol, to yield said C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide;
- and
- (b) removing any excess potassium hydroxide by reacting with carbon dioxide.
A method for the preparation of C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 614 C.sub.20 alkyl quaternary ammonium hydroxide, said method comprising
- (a) reacting a C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium chloride reactant and potassium hydroxide reactant in a solvent comprising an aqueous C.sub.1 -C.sub.4 normal alcohol, said potassium hydroxide being present in an amount sufficient to yield said C.sub.1 -C.sub.20 alkyl or aryl-substituted alkyl, C.sub.8 -C.sub.20 alkyl quaternary ammonium hydroxide;
- and
- (b) removing any excess potassium hydroxide by reacting with carbon dioxide.
Dependencies are inferred from the claim text.