Method for preparing freezing point depressant composition

Abstract

A method for preparing a composition with low corrosive effect and low freezing point including mixing an ammonium cation source with a carboxyl anion source in an appropriate molar or weight ratio for obtaining an organic ammonium carboxylate of formula [NR1R2R3R4]+n [R5(COO)n]−n in which R1, R2, and R3 are selected from the group comprising hydrogen, substituted and unsubstituted alkyls containing 1-6 carbon atoms, R4 is a substituted or unsubstituted alkyl containing 1-6 carbon atoms, R5 is hydrogen, a substituted or unsubstituted hydrocarbon containing 1-6 carbon atoms and n is an integral of 1-6, and thereafter adding possible solvent and at the same time keeping alkali or alkali-earth metal content of the composition in a range of 0.001-30 wt % and halide content in a range of 0.001-1 wt %.

1 . A method for preparing a composition with low corrosive effect and low freezing point, by mixing an ammonium cation source with a carboxyl anion source in an appropriate molar or weight ratio, either without a medium or by using an appropriate medium for obtaining liquid or water-soluble organic ammonium carboxylate of formula (1):
   [NR 1 R 2 R 3 R 4 ] +   n  [R 5 (COO)n] −n ,  (1),
   in which R 1 , R 2 , and R 3  are selected from the group comprising hydrogen, substituted and unsubstituted alkyls containing 1-6 carbon atoms, R 4  is a substituted or unsubstituted alkyl containing 1-6 carbon atoms, R 5  is hydrogen, a substituted or unsubstituted hydrocarbon containing 1-6 carbon atoms and n is an integral 1-6 and   thereafter adding possible solvent and at the same time keeping alkali or alkali-earth metal content of the composition in a range of 0.001-30 wt-%, preferably in a range of 0.001-30 wt-% and most preferably in a range of 0.001-1.0 wt-% and halide content in a range of 0.001-1 wt-% most preferably in a range of 0.001-0.1 wt-%.   
     
     
         2 . The method according to  claim 1 , wherein R 5  is hydrogen, a substituted or unsubstituted alkyl containing 1-6 carbon atoms, preferably hydrogen, a substituted or unsubstituted alkyl containing 1-4 carbon atoms, and n is 1 or 2, preferably 1. 
     
     
         3 . The method according to  claim 2 , wherein R 5  is hydrogen, methyl or ethyl. 
     
     
         4 . The method according to  claim 2 , wherein R 1  is hydrogen, R 2  and R 3  are selected from the group comprising hydrogen and C 1 -C 6  alkyls substituted with a hydroxyl group, preferably in the group comprising hydrogen and C 1 -C 4 -alkyls substituted with a hydroxyl group, and R 4  is a C 1 -C 6 -alkyl substituted with a hydroxyl group, preferably a C 1 -C 4 -alkyl substituted with a hydroxyl group. 
     
     
         5 . The method according to  claim 4 , wherein R 1  is hydrogen, R 2  and R 3  are selected from the group comprising hydrogen and ethyl substituted with a hydroxyl group, preferably in the group comprising hydrogen and 2-hydroxyethyl, and R 4  is an ethyl substituted with a hydroxyl group, preferably 2-hydroxy ethyl. 
     
     
         6 . The method according to  claim 1 , wherein the organic ammonium carboxylate of formula (1) is a salt of formic acid and monoethanolamine and/or triethanolamine or a salt of lactic acid and monoethanolamine and/or triethanolamine. 
     
     
         7 . The method according to  claim 6 , wherein the organic ammonium carboxylate of formula (1) is a mixture of a salt of formic acid or lactic acid and monoethanolamine, preferably in the weight ratio 80:20-20:80. 
     
     
         8 . The method according to  claim 1 , wherein the organic ammonium carboxylate of formula (1) is prepared in the form of an aqueous solution preferably with water, in which the ammonium carboxylate concentration is in the range 0.5-100% wt-%, preferably 5-70% wt-% while the freezing point of the composition is kept in the range of −5 to −50° C. 
     
     
         9 . The method according to  claim 8 , wherein the prepared aqueous solution of organic ammonium carboxylate of formula (1) contains organic ammonium carboxylate of formula (1) and water in a weight ratio in the range 1:20-20:1, preferably in the range 1:6-1:1. 
     
     
         10 . The method according to  claim 1 , wherein into liquid or water-soluble organic ammonium carboxylate of formula (1) and possible solvent is additionally mixed an alkali metal, an alkaline earth metal or an ammonium salts of C 1 -C 6  monocarboxylic acids or urea or ethylene glycol or propylene glycol, or glycerol or a mixture thereof so that the composition contains 5 to 97.5 wt-% of water or alkali metal, an alkaline earth metal or an ammonium salts of C 1 -C 6  monocarboxylic acids or urea or ethylene glycol or propylene glycol, or glycerol or a mixture thereof provided that alkali or alkali-earth metal content is kept in a range of 0.001-30 wt-%. 
     
     
         11 . The method according to  claim 1 , wherein into the composition is included auxiliary substances such as additional corrosion inhibitors, biocides, coloring agents, surfactants, and viscosity intensifiers from 0.001 to 10 wt-%. 
     
     
         12 . A freezing point depressant composition comprising liquid organic ammonium carboxylate of formula (1):
   [NR 1 R 2 R 3 R 4 ] +   n  [R 5 (COO)n] −n ,  (1),
   in which, R 1 , R 2 , and R 3  are selected from the group comprising hydrogen, C 1 -C 4 -alkyls substituted with hydroxyl group, and unsubstituted C 1 -C 4 -alkyls, R 4  is a C 1 -C 6 -alkyl substituted with a hydroxyl group or an unsubstituted C 1 -C 6 -alkyl, R 5  is selected from the group consisting of hydrogen substituted or unsubstituted methyl, and a substituted or unsubstituted ethyl, and n is 1 or 2, provided that that when R 5  is hydrogen, NR 1 R 2 R 3 R 4  is not triethanolamine; and wherein the composition is added with an organic solvent and has electrical conductivity of from 0.05-100 mS/cm, a freezing point lower than distilled water and a viscosity of from 0.1-50,000 mPas and alkali metal or alkali earth metal concentration in the composition is in a range of 0.001-1.0 wt %.   
     
     
         13 . The composition according to  claim 12 , wherein the composition is a grease-like composition with viscosity in a range of 100-50,000 mPas. 
     
     
         14 . The composition according to  claim 12 , wherein the composition has viscosity in range of 5.0-10,000 mPas and electrical conductivity in range of 1.0-100 mS/cm.