but better than nothing ..
Preparation of phosphorus oxychloride from phosphorus trichloride via oxidation with potassium (or sodium) chlorate:
In a 100 ml round-bottom flask, equipped with a 2 necked adapter with dropping funnel and a 4-bulb Allihn condensor, 16g of finely powdered potassium chlorate are covered with 20g of phosphorus oxychloride
(This is because the reaction of phosphorus trichloride with chlorates is pretty hefty, without a "thinner" even a small explosion might occur). 50g of phosphorus trichloride are then added drop by drop, the first drops cause a very strong reaction, the liquid begins to boil and it becomes colourless. After all of the trichloride has been added, the such formed phosphorus oxychloride is distilled from the flask in an oil-bath at 150°C
(bath temperature]. The yield is nearly quantitative, 72.5g of oxychloride, the theoretical amount is 75.8g.
Phosphorus oxychloride is a strongly refractive, fuming liquid, specific gravity 1.7, boiling point 107.2°C. Its melting point is 1.8°C.
Note: The used apparatus has to be completely dried before the beginning of the synthesis, also the chlorate has to be dried before
(in a desiccator, I'd recommend). If water is present, the phosphorus trichloride will react extremely violent with the chlorate, causing intensive colouring of the mixture from oxides of chlorine.
[Translated from: "Präparative Chemie", from L. Vanino, Vol. I, Enke Verlag, 1921]
Italics mine