Synergistic chemistry to prevent silicate scaling

Abstract

Two intermediates that have known separate efficacy for preventing scales such as calcium carbonate, magnesium carbonate and barite (barium sulfate) were discovered to have a synergistic effect for preventing or inhibiting silicate scaling when used together. Each of these intermediates is ineffective at preventing silicate scaling when used alone; however, when used in combination, they have a synergistic benefit. In one non-limiting embodiment the components include a polyamine phosphonate and a lysine tetra(alkylene)phosphonate.

What is claimed is: 
     
         1 . A chemical blend for inhibiting or preventing the formation of silicate scales in a fluid having a potential for silicate scaling, where the chemical blend comprises:
 at least one first chemical that is a polyamine phosphonate, and   at least one second chemical that is a lysine tetra(alkylene)phosphonate.   
     
     
         2 . The chemical blend of  claim 1  where the polyamine phosphonate is diethylenetriamine (DETA) phosphonate and where the lysine tetra(alkylene)phosphonate is lysine tetra(methylene)phosphonate (LTMP). 
     
     
         3 . The chemical blend of  claim 1  where in the chemical blend:
 the amount of the polyamine phosphonate ranges from about 0.1 to about 50 wt %, and 
 the amount of the lysine tetra(alkylene)phosphonate ranges from about 0.1 to about 50 wt %. 
 
     
     
         4 . The chemical blend of  claim 1  where in the chemical blend:
 the amount of the polyamine phosphonate ranges from about 1 to about 36 wt %, and 
 the amount of the lysine tetra(alkylene)phosphonate ranges from about 1 to about 36 wt %. 
 
     
     
         5 . The chemical blend of  claim 1  where in the chemical blend:
 the amount of the polyamine phosphonate ranges from about 2 to about 25 wt %, and 
 the amount of the lysine tetra(alkylene)phosphonate ranges from about 2 to about 25 wt %. 
 
     
     
         6 . A chemical blend for inhibiting or preventing the formation of silicate scales in a fluid having a potential for silicate scaling, where the chemical blend comprises:
 about 0.1 to about 50 wt % of at least one first chemical that is diethylenetriamine (DETA) phosphonate, and   about 0.1 to about 50 wt % of at least one second chemical that is a lysine tetra(methylene)phosphonate (LTMP).