Process for the manufacture of phosphoric...

Details Process for the manufacture of phosphoric... Process for the manufacture of phosphoric...

C - Chemistry, Metallurgy

07

F

260/540.7

C07F 9/22 (2006.01)

Patent

CA 1060471

ABSTRACT Process for the manufacture of phosphoric acid- tris-(dimethylamide) (C) by reacting phosphorus oxychloride and dimethylamine in a molar ratio of 1 to at least 3, under anhydrous conditions and, optionally, under the ap- plication of pressure, which comprises carrying out the re- action in two separate process stages, wherein, in the first stage the phosphorus oxychloride and dimethylammonium chloride are heated in a molar ratio of approximately 1 : 1.5, and in the second stage dimethylamine is added to a mixture containing about 1.5 gram atoms of chlorine bonded to phos- phorus and consisting of phosphoric acid dimethylamide- dichloride (A) and phosphoric acid-bis-(dimethylamide)-chloride (B) in which the proportion of (A) is not more than 50 mole %, or added to B alone, C is separated off at the end of the amine absorption and the formed dimethylammonium chloride is returned to the first stage. The compound C produced is a valuable polar solvent and reaction medium with catalytic properties which is being used increasingly as an inter- mediate product.

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