Oxygen scavenger and boiler water treatment chemical

Abstract

A boiler water treatment chemical includes a heterocyclic compound with N-substituted amino group, or the salt thereof, and alkaline agent and/or water soluble polymer.

What is claimed is:  
     
         1 . A boiler water treatment chemical including a heterocyclic compound with N-substituted amino group, or the salt thereof, and alkalic agent and/or water soluble polymer.  
     
     
         2 . A boiler water treatment chemical according to  claim 1 , further including neutral amine.  
     
     
         3 . A boiler water treatment chemical according to  claim 1 , wherein the heterocyclic compound with N-substituted amino group is 1-aminopyrrolidine, 1-amino-4-methylpiperazine, 1-aminopiperidine, 1-aminohomopiperidine,1,4-diaminopiperazine, N-aminomorpholine, or morpholinobyguanide, and wherein the salt thereof is water soluble salt of said heterocyclic compounds and aliphatic carboxylic acid such as succinic acid, glutaric acid, adipic acid, gluconic acid, glycollic acid, lactic acid, malic acid, tartaric acid, or citric acid, or polycarboxylic acid such as polyacrylic acid.  
     
     
         4 . A boiler water treatment chemical according to  claim 1 , wherein the alkalic agent is sodium hydroxide, potassium hydroxide, sodium carbonate, or potassium carbonate.  
     
     
         5 . A boiler water treatment chemical according to  claim 1 , wherein the water soluble polymer is polyacrylic acid, polymaleic acid, polymethacrylate acid, copolymer of acrylic acid and acrylic amide, copolymer of acrylic acid and hydroxyallyloxypropanesulfonic acid, copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, or the salt thereof.  
     
     
         6 . A boiler water treatment chemical according to  claim 2 , wherein the neutral amine is one or more among cyclohexylamine, 2-amino-2-methyl-1-propanole, monoethanolamine, diethanolamine, morpholine, monoisopropanolamine, dimethylethanolamine, diethylethanolamine, dimethylpropanolamine, and dimethylpropilamine.  
     
     
         7 . A boiler water treatment chemical according to  claim 1 , wherein the ratio of the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent and/or water soluble polymer is set as follows in weight: 
 i) when the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent are used together,    heterocyclic compound with N-substituted amino group or salt thereof: alkalic agent=1:0.01-20;    ii) when the heterocyclic compound with N-substituted amino group or the salt thereof and the water soluble polymer are used together,    heterocyclic compound with N-substituted amino group or salt thereof: water soluble polymer=1:0.01-20; and    iii) when the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent and the water soluble polymer are used together,    heterocyclic compound with N-substituted amino group or salt thereof: alkaline agent: water soluble polymer=1:0.01-20:0.01-20.    
     
     
         8 . A method of using an oxygen scavenger, comprising: adding to boiler water an effective amount of an oxygen scavenger including, as an effective component, a heterocyclic compound with N-substituted amino group, or the salt thereof, and alkaline agent and/or water soluble polymer.  
     
     
         9 . A method of using an oxygen scavenger according to  claim 8 , wherein said oxygen scavenger further includes neutral amine.  
     
     
         10 . A method of using an oxygen scavenger according to  claim 8 , wherein the heterocyclic compound with N-substituted amino group is 1-aminopyrrolidine, 1-amino-4-methylpiperazine, 1-aminopiperidine, 1-aminohomopiperidine,1,4-diaminopiperazine, N-aminomorpholine, or morpholinobyguanide, and wherein the salt thereof is water soluble salt of said heterocyclic compounds and aliphatic carboxylic acid such as succinic acid, glutaric acid, adipic acid, gluconic acid, glycollic acid, lactic acid, malic acid, tartaric acid, or citric acid, or polycarboxylic acid such as polyacrylic acid.  
     
     
         11 . A method of using an oxygen scavenger according to  claim 8 , wherein the alkaline agent is sodium hydroxide, potassium hydroxide, sodium carbonate, or potassium carbonate.  
     
     
         12 . A method of using an oxygen scavenger according to  claim 8 , wherein the water soluble polymer is polyacrylic acid, polymaleic acid, polymethacrylate acid, copolymer of acrylic acid and acrylic amine, copolymer of acrylic acid and hydroxyallyloxypropanesulfonic acid, copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid, or the salt thereof.  
     
     
         13 . A method of using an oxygen scavenger according to  claim 9 , wherein the neutral amine is one or more among cyclohexylamine, 2-amino-2-methyl-1-propanole, monoethanolamine, diethanolamine, morpholine, monoisopropanolamine, dimethylethanolamine, diethylethanolamine, dimethylpropanolamine, and dimethylpropilamine.  
     
     
         14 . A method of using an oxygen scavenger according to  claim 8 , wherein the ratio of the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent and/or water soluble polymer is set as follows in weight: 
 i) when the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent are used together,    heterocyclic compound with N-substituted amino group or salt thereof: alkalic agent=1:0.01-20;    ii) when the heterocyclic compound with N-substituted amino group or the salt thereof and the water soluble polymer are used together,    heterocyclic compound with N-substituted amino group or salt thereof: water soluble polymer=1:0.01-20; and    iii) when the heterocyclic compound with N-substituted amino group or the salt thereof and the alkalic agent and the water soluble polymer are used together,    heterocyclic compound with N-substituted amino group or salt thereof: alkaline agent: water soluble polymer 1:0.01-20:0.01-20.