Process of inhibiting scale using mixtures of pyrophosphates and dithiophosphoric acids

Abstract

Abstract PYROPHOSPHATES, OR MIXTURE OF PYROPHOSPHATES WITH THE O,O-DISTITUTED DITHIOPHOSPHORIC ACIDS, ARE PARTICULARLY USEFUL AS SCALE INHIBITORS FOR AQUEOUS SYSTEMS. THE PYROPHOSPHATES EMPLOYED HEREIN CONTAIN BOTH OXYGEN AND SULFUR, OF THE FORMULA (R-X-)2-P(=X)-X-P(=X)(-X-R)2 WHERE X IS OXYGEN OR SULFUR SUCH AS THOSE OF THE FORMULA WHERE R IS OTHER THAN A LOWER ALKYL GROUP (I.E. CONTAINING LESS THAN SEVEN CARBON ATOMS) AND PREFERABLY A HIGHER ALKYL (I.E. AT LEAST SIX CARBONS), PHENOL, ETC., AND MOST PREFERABLY AN OXYALKYLATED RADICAL. PYROPHOSPHATES ARE PREPARED BY REACTING P2S5 WITH THE APPROPRIATE ALCOHOL AND CONTINUING THE REACTION TO CONVERT THE O,O-DISUBSTITUTED DITHIOPHOSPORIC ACID INTIALLY FORMED TO THE PYROPHOSPHATE. THE RESULTING PRODUCT USUALLY CONTAINS THE O,ODISUBSTITUTED DITHIOPHOSPHORIC ACID IN ADDITION TO THE PYROPHOSPHATE. (R-O-)2-P(=S)-S-P(=X)(-O-R)2 AND R-O-P(=S)(-S-R)-O-P(=S)(-O-R)-S-R

Inventors

• 👤 Alfred Eugene Woodson

Bibliographic Details