Lime hydrate with improved reactivity via additives

Abstract

Systems and Methods to produce a lime hydrate sorbent composition formed of highly reactive lime hydrate (HRH) by adding compounds to the slaking water in a method that would produce a non-HRH, which will typically be a lime hydrate having citric acid reactivity as discussed above of more than ten seconds, to make the non-HRH an HRH, which is having a citric acid reactivity of less than or equal to ten seconds.

1 . A method for forming a sorbent composition with improved acid gas reactivity comprising:
 forming a calcium oxide particulate;   slaking said calcium oxide particulate with water including an additive to form calcium hydroxide particles; and   forming a sorbent composition from said calcium hydroxide particles;   wherein said additive is selected from the group consisting of: glycols derived from ethylene oxide and amines produced from reacting ethylene oxide with ammonia;   wherein said additive is provided at a ratio of between 0.5% to 3% of said calcium oxide feed by weight.   wherein said calcium hydroxide particles have a reactivity of less than 10 seconds and a BET surface area of 20 m 2 /g or greater; and   wherein said reactivity is an amount of time it takes said calcium hydroxide particles to neutralize in citric acid, said citric acid having a mass greater than 10 times a mass of said calcium hydroxide particles.   
     
     
         2 . The method of  claim 1  wherein said reactivity is less than 8 seconds. 
     
     
         3 . The method of  claim 1  wherein said reactivity is less than 4 seconds. 
     
     
         4 . The method of  claim 1  wherein said reactivity is less than 3 seconds. 
     
     
         5 . The method of  claim 1  wherein said reactivity is between about 2 seconds and about 5 seconds. 
     
     
         6 . The method of  claim 1  wherein said mass of said calcium hydroxide particles is about 1.7 grams and mass of citric acid is about 26 grams. 
     
     
         7 . The method of  claim 6  wherein said reactivity is less than 8 seconds. 
     
     
         8 . The method of  claim 6  wherein said reactivity is less than 4 seconds. 
     
     
         9 . The method of  claim 6  wherein said reactivity is less than 3 seconds. 
     
     
         10 . The method of  claim 6  wherein said reactivity is between about 2 seconds and about 5 seconds. 
     
     
         11 . The method of  claim 1  wherein said calcium hydroxide particles have a BET surface area of 30 m 2 /g or greater. 
     
     
         12 . The method of  claim 11  wherein said calcium hydroxide particles have a BET surface area of 40 m 2 /g or greater. 
     
     
         13 . The method of  claim 1  wherein said sorbent composition comprises at least 95% calcium hydroxide particles. 
     
     
         14 . The method of  claim 1  further comprising: wherein said water also includes a compound selected from the group consisting of: sugars and lignosulfonate salts. 
     
     
         15 . The method of  claim 1  wherein said additive comprises diethylene glycol. 
     
     
         16 . The method of  claim 1  wherein said additive comprises tri-ethanolamine. 
     
     
         17 . The method of  claim 1  wherein said additive is provided at a ratio of about 0.5% of said calcium oxide feed by weight.