Method for producing aminic acid by glycerin water thermal reduction of CO2

The invention discloses a method for producing methanoic acid by glycerol to hydrothermally reduce CO2, which relates to a process that the glycerol is also transformed into lactic acid when the glycerol is utilized to reduce CO2 into the methanoic acid. Firstly, according to the mass proportion of 1 to (1-10) to (1-10), the glycerol, NaOH (or KOH) as well as CO2 are added into a hydro-thermal reactor, and then react for 20 to 300 minutes at a temperature of between 150 and 400 DEG C under the pressure of between 2 and 15Mpa to produce sodium (potassium) lactate and sodium (potassium) formate solution, and the solution is cooled to the room temperature to produce the sodium (potassium) lactate and sodium (potassium) formate crystals; then hydrochloric acid is used to neutralize the crystals to produce mixed solution of the methanoic acid and the lactic acid, and finally the mixed solution is subjected to the reduced pressure distillation and is separated according to different boiling points of the lactic acid and the methanoic acid to produce the lactic acid and the methanoic acid. Or the prior esterification separation technology is used to esterify the neutralized lactic acid and methanoic acid, and the reduced pressure distillation and the separation are performed according to the different boiling points to produce the lactic acid and the methanoic acid. In the invention, the glycerol can be byproduct glycerol of biodiesel, CO2 can be CO2 discharged by combustion, and the method has simple process, no secondary pollution, and valuable economic and social benefits.