Patent ID: 8344179
Filing Date: 2013-01-01
Classification: E21B

Abstract:
1. A method of recovering formate from an aqueous halide-contaminated formate brine, comprising: mixing a non-aqueous formate recovery solvent and the aqueous halide-contaminated formate brine, wherein the non-aqueous formate recovery solvent is selected from the group consisting of N-methylpyrrolidone, N-octylpyrrolidone, 2-pyrrolidone, 6-membered lactam, N-hydrocarbyl-2-pyrrolidone, wherein the hydrocarbyl group may include an alkyl, aryl, or alkaryl group ranging from 1 to 10 carbons in length, 5- or 6-membered lactones, and combinations thereof; extracting the formate into the recovery solvent; separating the formate recovery solvent from the aqueous halide-contaminated formate brine; and recovering the formate from the formate recovery solvent.