Abstract: Process for purification of technical grade pentachlorophenol by immersing the pentachlorophenol in an aqueous alkaline solution or suspension, separating an insoluble portion from the resultant mixture, dissolving the insoluble portion in an aqueous alkaline solution, treating the solution with active charcoal, removing the active charcoal, adding copper sulfate to the solution, removing the deposit which forms from the solution, and recovering pentachlorophenol from the solution. Alternatively, the steps of treatment with active charcoal and addition of copper sulfate can be reversed.

Abstract: Double salts of copper alkylphenolsulfonate and basic calcium are prepared by reacting copper alkylphenolsulfonate having at the para-position an alkyl group of from 4 to 12 carbon atoms and at the ortho-position the sulfonic acid group with basic calcium. The double salts are employed as the effective component of agricultural germicides.