Corrosion inhibitor

Abstract

It has surprisingly been discovered that simple diols and triols work as corrosion inhibitors in concentrated organic and inorganic acids, e.g. used as additives in metallic equipment in factories and plants. These corrosion inhibitors are cheap and readily available in large quantities. The diol and triol also reduces evaporation of the acid, and thus improves the working environment.

1 . A method of inhibiting corrosion of a metal that is in contact with an organic or inorganic acid comprising mixing with said organic or inorganic acid an amount of a diol or a triol sufficient to inhibit corrosion of said metal. 
     
     
         2 . The method according to  claim 1 , wherein the diol or triol comprises 10-90% of the total mixture. 
     
     
         3 . The method according to  claim 1 , a triol is mixed with said organic or inorganic acid and said triol is glycerol. 
     
     
         4 . The method according to  claim 1  further comprising mixing an additional corrosion inhibitor. 
     
     
         5 . The method according to  claim 1 , wherein a diol is mixed with said organic or inorganic acid and said diol is glycol. 
     
     
         6 . A composition comprising sulfuric acid, sulfurous acid, hydrochloric acid, or formic acid and a diol. 
     
     
         7 . The composition according to  claim 6 , wherein said diol is glycol. 
     
     
         8 . A composition comprising sulfuric acid, sulfurous acid, hydrochloric acid, or formic acid and a triol. 
     
     
         9 . The composition according to  claim 8 , wherein said triol is glycerol.