公开(公告)号：US3574534A

公开(公告)日：1971-04-13

申请号：US3574534D

申请日：1967-07-25

申请人： KENNETH J SHAVER ,  CHUNG YU SHEN

发明人： SHAVER KENNETH J ,  SHEN CHUNG YU

IPC分类号： C01B25/41 ,  C11D3/06 ,  C11D3/16 ,  C01B25/30 ,  C01B25/38

CPC分类号： C11D3/062 ,  C01B25/416 ,  C11D3/16

摘要： AN IMPROVEMENT TO THE PROCESS WHEREIN A STRONG BASE IS ADDED TO AN AQUEOUS MEDIUM CONTAINING SODIUM TRMETAPHOSPHATE TO THEREBY FORM A HTAINING SODIUM TRIPOLYPHOSPHATE PRODUCT, COMPRISING ADDING AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITRILOTRIACETIC ACID, ETHYLENEDIAMINE TETRAACETIC AMINO TRI(METHYLENE PHOSPHONIC ACID), 1-HYDROXY ETHYLIDENE DIPHOSPHONIC ACID, SATURATED POLYCARBOXYLIC ACIDS CONTAINING FROM 4 TO 12 CARBON ATOMS, THE WATER SOLUBLE SALTS OF SAID ACIDS AND MIXTURES THEREOF PRIOR TO ADDING THE STRONG BASE; THE WEIGHT RATIO OF SAID ORGANIC COMPOUND TO SAID SODIUM TRIMETAPHOSPHATE BEING FROM ABOUT 1:1000 TO ABOUT 2:1, RESPECTIVELY.