Methods for preparing primary alkyl bromides
OwnerDavid T. Erdman, Jonathan D. Spicher +2inventors
InventorsDavid T. Erdman, Jonathan D. Spicher, Mary F. Lamar, David E. Cockrill
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Abstract
Methods of converting methyl chloride to methyl bromide include the steps of providing a composition comprising a bromide salt and a liquid; contacting the composition with gaseous methyl chloride and/or methyl chloride dissolved in a water-immiscible solvent; and recovering methyl bromide.
Claims22
A method of converting methyl chloride to methyl bromide comprising:
- (a) providing an aqueous composition comprising a bromide salt and water;
- (b) contacting the aqueous composition with an organic composition comprising an organic solvent, methyl chloride and phase transfer catalyst;
- and
- (c) recovering a product comprising methyl bromide.
A method of converting methyl chloride to methyl bromide comprising:
- (a) providing a composition comprising a bromide salt, water, a first solvent and phase transfer catalyst;
- (b) contacting the composition with gaseous methyl chloride and/or methyl chloride dissolved in a second solvent;
- and
- (c) recovering a gaseous product comprising methyl bromide.
A method of preparing a primary alkyl bromide comprising:
- (a) providing a composition comprising bromide salt, water, solvent and phase transfer catalyst;
- (b) contacting the composition with a primary alkyl chloride thereby forming a primary alkyl bromide;
- and
- (c) recovering the primary alkyl bromide.
A method of reducing the level of bromide salt in an aqueous composition comprising:
- (a) providing an aqueous composition comprising a bromide salt and water;
- and
- (b) extracting the aqueous composition with an organic composition comprising an organic solvent, methyl chloride and phase transfer catalyst.
A method of converting methyl chloride to methyl bromide comprising:
- (a) providing a reaction column oriented substantially vertically along its axis and having an upper portion and a lower portion, wherein the reaction column contains packing suitable for continuous extractions;
- (b) introducing an aqueous feed into the upper portion of the reaction column, wherein the aqueous feed comprises water and a bromide salt selected from the group consisting of the alkali metal bromides, alkaline earth metal bromides and combinations thereof;
- (c) introducing an organic feed into the lower portion of the reaction column, wherein the organic feed comprises methyl chloride, a water immiscible organic solvent, and a quaternary ammonium salt, quaternary phosphonium salt, or a coordinating catalyst such as crown ether, cryptane, PEGs, TDA-1 and combinations thereof;
- and
- (d) allowing at least one portion of the aqueous feed and at least a portion of the organic feed to contact each other within the reaction column thereby converting at least a portion of the methyl chloride to methyl bromide.
A method of converting methyl chloride to methyl bromide comprising:
- (a) providing a reaction column oriented substantially vertically along its axis and having an upper portion and a lower portion, wherein the reaction column contains a solid supported phase transfer catalyst;
- (b) introducing an aqueous feed into the upper portion of the reaction column, wherein the aqueous feed comprises water and a bromide salt selected from the group consisting of alkali metal bromides, alkaline earth metal bromides and combinations thereof;
- (c) introducing an organic feed into the lower portion of the reaction column, wherein the organic feed comprises methyl chloride and a water immiscible organic solvent;
- and
- (d) allowing at least a portion of the aqueous feed and at least a portion of the organic feed to contact each other within the reaction column in the presence of the solid supported salt phase transfer catalyst, thereby converting at least a portion of the methyl chloride to methyl bromide.
Dependencies are inferred from the claim text.