Wacker-chemie Gmbh

Alfred Trommet

Hellmuth Spes

Heinz Liberda

Process for the production of phosphoric acid-dimethylamide-dichloride (A) or phosphoric acid-bis-(dimethylamide)-chloride (B) by reacting phosphorus oxychloride and dimethylammonium chloride at elevated temperature under anhydrous conditions, which comprises heating phosphorus oxychloride with a mixture of dimethylammonium-chloride and A and/or B to temperatures of 130.degree. to 240.degree. C, using per mole of phosphorus oxychloride at least 1 mole of dimethylammonium chloride and optionally distilling off A or B from the reaction mixture. The compounds A and B produced according to the process are valuable intermediate products for the manufacture of pesticides, solvents, and lubricants.

Process for the production of phosphoric acid-dimethylamide-dichloride

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 application of pressure, which comprises carrying out the reaction 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 phosphorus 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 intermediate product.

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Burghausen, Germany

Alfred Trommet