Method for producing alkaline earth metal formate

Abstract

Provided is a method for producing an alkaline earth metal formate, the method including a first step of reacting hydrogen and carbon dioxide with a carbonate or hydrogen carbonate of an alkaline earth metal using a homogeneous catalyst in the presence of a solvent in a two-phase system in which an organic phase and an aqueous phase are present in a separated state in the solvent to produce an alkaline earth metal formate.

1 . A method for producing an alkaline earth metal formate, the method comprising:
 a first step of reacting hydrogen and carbon dioxide with a carbonate or hydrogen carbonate of an alkaline earth metal   using a homogeneous catalyst   in the presence of a solvent   in a two-phase system in which an organic phase and an aqueous phase are present in a separated state in the solvent   to produce a formate of an alkaline earth metal.   
     
     
         2 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the method further includes a second step of separating a solution including the homogeneous catalyst from the reaction solution obtained by the first step, by partitioning. 
     
     
         3 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the alkaline earth metal is calcium. 
     
     
         4 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the homogeneous catalyst contains at least one metal selected from ruthenium, iridium, iron, nickel, and cobalt. 
     
     
         5 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the organic phase contains at least one selected from toluene, dioxane, tetrahydrofuran, ethyl acetate, methylcyclohexane, and cyclopentyl methyl ether. 
     
     
         6 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the homogeneous catalyst is a metal complex catalyst, and a ligand of the metal complex catalyst is further added. 
     
     
         7 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein the homogeneous catalyst is at least one selected from a ruthenium complex represented by the following formula (1), a tautomer or stereoisomer thereof, and a salt compound of the ruthenium complex, tautomer or stereoisomer: 
       
         
           
           
               
               
           
         
         wherein R 0  represents a hydrogen atom or an alkyl group,
 Q 1  each independently represents CH 2 , NH or O, 
 R 1  each independently represents an alkyl group or an aryl group (provided that when Q 1  represents NH or O, at least one of R 1  represents an aryl group), 
 A each independently represents CH, CR 5  or N, R 5  represents an alkyl group, an aryl group, an aralkyl group, an amino group, a hydroxy group or an alkoxy group, 
 X represents a halogen atom, 
 n represents 0 to 3, and 
 when more than one L are present, L each independently represents a neutral or anionic ligand. 
 
       
     
     
         8 . The method for producing an alkaline earth metal formate according to  claim 7 , wherein a ligand represented by the following formula (4) is further added: 
       
         
           
           
               
               
           
         
         wherein R 0  represents a hydrogen atom or an alkyl group,
 Q 2  each independently represents NH or O, 
 R 3  each independently represents an aryl group, 
 A each independently represents CH, CR 5  or N, and R 5  represents an alkyl group, an aryl group, an aralkyl group, an amino group, a hydroxy group or an alkoxy group. 
 
       
     
     
         9 . The method for producing an alkaline earth metal formate according to  claim 1 , wherein a quaternary ammonium salt is further used as a phase transfer catalyst in the first step.