Patent ID: 8513460

Claim:
A process for preparing N-(hydrocarbyl)phosphoric or thiophosphoric triamide of general formula I (RNH)(NH 2 ) 2 P=X (I) wherein R is a hydrocarbyl group and X is O or S, characterized in that it comprises the steps of: a) reacting about one equivalent of CI 3 P=X, wherein X is O or S, with about two equivalents of hydrocarbylamine in an aromatic solvent to obtain a solution of a compound of general formula II (RNH)Cl 2 P=X (II) wherein R and X are as defined above, and a solid phase containing hydrocarbylammonium chloride, b) removing the solid phase to obtain the solution, c) adding at least four equivalents of ammonia to the solution obtained in step b) to obtain a suspension of solid compound of general formula I and solid ammonium chloride in the aromatic solvent, d) heating the suspension obtained in step c) to the temperature in the range of from 50 to 80° C. to obtain a solution of the compound of general formula I and a solid phase containing ammonium chloride, e) removing the solid phase at the temperature in the range of from 50 to 80° C. to obtain the solution, f) cooling the solution obtained in step e) to the temperature in the range of from 0 to 25° C. to obtain solid product of the general formula I.