Jan.  23,  2014  13  US  2014/0021404 Al  tration in outlet nitrogen gas increased significantly, and  reached the maximum value in 2 to 5 minutes. The infrared  absorption profile and powder X-ray diffraction profile of the  products confirmed that the products were cI-MgAI-LDH3.  The amount of residual carbonate ions was 5% or lower, and  weight loss of the products due to dissolution was not found.  [0219]  Regarding (CH 3 ) 2 NH.HCI, the relation with the  amount of residual carbonate ions and change in weight were  examined by changing value f. FIG.  21  is a chart plotting the  value f and the amount of residual carbonate ions in the  products, where (1) is a curve showing the carbonate ion  content, and (2) is a curve showing the change in weight of the  product. When f=3, the amount of residual carbonate ions  decreased to 3% or lower, and even if value fwas increased to  6, no change in weight of the product was found, meaning that  no weight loss due to dissolution was found.  [0220]  Experiments were conducted using (CH 3 ) 2 NH.HCI  and (CH 3 ) 3 N.HCI, and ethanol, instead of methanol, with  value ffixed to 3 (f=3). As a result, generation ofCI-MgAI› LD H3 was confirmed. The amount of residual carbonate ions  was 3% or lower, and the weight was approximately the same  as that of methanol.  [0221]  For comparison, reaction was caused using (CH 3 )  2 NH.HCI and (CH 3 ) 3 N.HCI, and degassed water, instead of  alcohol, under f=S condition for 3 hours. The amount of  residual carbonate ions was approximately 80%, meaning  that substitution by c1- hardly occurred. In addition, CO 2  was  not found in outlet nitrogen gas, meaning that decarbonation  did not occur.  [0222]  Using amine acid salt other than those used in  Example 10, experiments of decarbonation were conducted.  The used amine acid salt were:  [0225]  CO 3  2 -MgAI-LDH3 was used as the starting mate› rial, and the amount of addition was represented by value  f.  As  in the case of Example 10, since H, one of the components of  HCI, is only protic molecule, one proton was considered to be  supplied from the amine acid salt represented by these chemi› cal formulae (f=[H+]/(2x[CO 3  2 -]).  [0226]  100mgofCO 3  2 -MgAI-LDH3 and50mL of metha› nol were used. The amine acid salt were dissolved in 10 to 20  mL methanol, and the remaining methanol was used to sus› pend co/-MgAI-LDH3. The experimental method was the  same as Example 9, except that value fwas fixed to 3.  [0227]  In all the experiments conducted using amine acid  salt shown above, the CO 2  concentration in the outlet nitrogen  gas increased significantly, and exhibited the maximum value  in 2 to 5 minutes. The infrared absorption profile and powder  X-ray diffraction profile confirmed that the products were  cI-MgAI-LDH3. In all the experiments, the amount of  residual carbonate ions was 5% or lower, and no weight loss  of the products due to dissolution was found.  [0228]  Regarding  HO(CH 2 ) 2 NH 2 .HCI  (ethanolamine  hydrochloride), reaction was made to occur under the condi- tion of largely excessive addition of f=S for 3 hours, using  decarbonated water, insteadofalcohol, for comparison. How› ever, the amount of residual carbonate ions remained around  86%, meaning that substitution by c1- hardly occurred. In  addition, no CO 2  was found in outlet nitrogen gas, meaning  that no decarbonation occurred.  [0229]  As shown in Examples 9, 10, and 11, it was found  that decarbonation occurred when amine acid salts were used  in alcohol.  [0230]  Metal salts formed by reaction of weak alkaline  metal hydroxide with strong acid tend to generate the protic  acids (HX) by hydrolysis at equilibrium. Salts formed by the  reaction of divalent or trivalent metal hydroxides with strong  acids belong to such kind of metal salts.  [0231]  In this Example, AICl 3  .6H 2 O containing trivalent Al  was used as metal salt. Since Al is hydrate salt, there exist  sufficient amount of water for hydrolysis.  [0232]  The amount of addition was expressed by value  f.  Since AICl 3 .6H 2 O generates three HCI ions by hydrolysis,  three protons, the same quantity as that of Cl, were considered  to be supplied. Consequently, f=[H+]/(2x[CO 3  2 -])=[Ci-]/2x  [CO32-]).  [0233]  100 mg of CO 3  2 -MgAI-LDH and 50 mL f methanol  were used. The metal salt was dissolved in 10 to 30 mL of  methanol, and the remaining methanol was used to suspend  CO 3  2 -MgAI-LDH3. The experimental method was the same  as Example 1. Reaction was performed while methanol solu› tion of metal salt was added and agitated in nitrogen gas flow.  [0234]  For comparison, experiment was also conducted  using NaCl, which is neutral salt. Reaction time was 2 hours,  and the obtained product was identified by FTIR.  [0235]  FIG.  22  is a chart plotting the value f and the amount  of residual carbonate ions in the product. As shown by (b) in  FIG.  22,  reaction occurred almost quantitatively withAIC!y  6H 2 O, and when f=l or higher, the amount of residual car› bonate ions became 5% or lower. Meanwhile, as shown by (a)  in FIG.  22,  the amount of residual carbonate ions was never  70% or lower with NaCl.  [0236]  Experiments were also conducted using LiCI and  KC!, which are also neutral salts, in addition to NaCl. The  same behavior as NaCl was exhibited, and the amount of  residual carbonate ions was never be 70% or lower.  [0237]  Rapid increase in CO 2  in outlet nitrogen gas was  found (peak in discharge was found in 2 to 5 minutes after the  addition) withAICl 3 .6H 2 O. Meanwhile with NaCl, LiCI, and  KC!, which are neutral salts, no CO 2  due to decarbonation  was found in outlet nitrogen gas.  [0238]  In this Example, experiment was conducted using  co/-MgAI-LDH3 and in air flow by an air pump, instead of  nitrogen gas flow. Filtration only was performed in nitrogen  gas flow. This experiment condition is such that the amount of  residual carbonate ions is expected to be 3% or lower if the  reaction is conducted in nitrogen gas flow.  [0239]  Using HCI as an acid, experiment was conducted in  ethanol under the same conditions as Example 2 except for  atmosphere. The amount ofHCI was f=l .25. Another experi- Example 13  Under Air Flow; MgAI-LDH3  Example 11  Hydroxylamine Hydrochloride or Ethanolamine  Hydrochloride-Methanol System; MgAI-LDH3  Metal Salt-Methanol System; MgAI-LDH3  Example 12  [0223]  (1) Hydroxylamine hydrochloride (R in RNH 2 .HCI  is hydroxyl group) and methoxylamine hydrochloride (R  in RNH 2 .HCI is methyl group), and  [0224]  (2) Ethanolamine hydrochloride, diethanolamine  hydrochloride, and triethanolamine hydrochloride (R in  RjNHc 3 _$_{1}$l.HCI is ethyl group). 