| 摘要 |
The process for the purification of a technical pentachlorophenol comprises the stage consisting in immersing it in an aqueous solution or suspension of a compound chosen from the group consisting of sodium bicarbonate, potassium bicarbonate, ammonium carbonate, aqueous ammonia and calcium carbonate and in dissolving the insoluble part which is obtained by removal of the solution containing the dissolved material into a hot aqueous solution of an alkaline substance which is capable of dissolving pentachlorophenol. The process then comprises the stage consisting of bringing the solution obtained into contact with active charcoal and, after removal of the absorbed material and of the active charcoal, in adding a small quantity of copper sulphate to the solution thus obtained and then in separating and in removing the deposit. Use for purifying pentachlorophenol.
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