Method of purifying acifluorfen

摘要

A method of purifying acifluorfen to achieve a purity of greater than about 92% by weight involves heating to dissolution a solution of an acifluorfen crude wet cake and 1,2-dichlorobenzene with the solution having from about 10 to about 30 weight percent of acifluorfen crude wet cake. The solution is then cooled until crystals of purified acifluorfen form. The crystals are then filtered at a temperature within the range of from about 0 DEG to about 30 DEG C. The filtered crystals are then recovered.