PROCESS FOR THE PURIFICATION OF PHENOXYBENZOIC ACID DERIVATIVES

摘要

"PROCESS FOR THE PURIFICATION OF PHENOXYBENZOIC ACID DERIVATIVES" Process for recovering and purifying a crude phenoxybenzoic acid derivative or its salts, mixed with one or more isomers and/or by-products, the said process comprising bringing this derivative or its salt into contact with an inert solvent which is capable of selectively dissolving the undesirable isomers and/or by-products, and then separating the phenoxybenzoic acid derivative or its salt from the solution of undesirable isomers and/or by-products.