Method and Device for Producing Methanol

Abstract

A method for producing methanol includes dissolving carbon dioxide in water to obtain a two-phase coexistence aqueous solution that is pressurized and heated to a critical state to separate critical state carbon dioxide and critical water. The critical state carbon dioxide is reduced to critical state carbon monoxide. The critical water is electrolyzed to obtain super critical state hydrogen and super critical state oxygen. The critical state carbon monoxide reacts with the super critical state hydrogen to produce methanol. Furthermore, a device for producing methanol is also provided in the present invention, comprising a mixing unit, a conversion unit and a synthesis unit, and which is highly effective in producing methanol and frugal in energy use.

1 . A method for producing methanol comprising:
 a pre-step including dissolving carbon dioxide in water to obtain a two-phase coexistence aqueous solution;   a conversion step including: pressurizing and heating the two-phase coexistence aqueous solution to a critical state to separate critical state carbon dioxide and critical water from the two-phase coexistence aqueous solution, reducing the critical state carbon dioxide to critical state carbon monoxide, and electrolyzing the critical water to obtain super critical state hydrogen and super critical state oxygen; and   a synthesis step including reacting the critical state carbon monoxide with the super critical state hydrogen to produce methanol.   
     
     
         2 . The method for producing methanol as claimed in  claim 1 , with the two-phase coexistence aqueous solution in the critical state having a pressure of 221 atm and a temperature of 672K. 
     
     
         3 . The method for producing methanol as claimed in  claim 1 , with the two-phase coexistence aqueous solution being pressurized and heated in the pre-step to turn the two-phase coexistence aqueous solution with carbon dioxide into a high temperature/high pressure state. 
     
     
         4 . The method for producing methanol as claimed in  claim 3 , with the two-phase coexistence aqueous solution in the high temperature/high pressure state having a pressure of 20 atm and a temperature higher than 330K. 
     
     
         5 . The method for producing methanol as claimed in  claim 3 , with the conversion step including a separation step, a reduction step, and an electrolysis step, with the critical state carbon monoxide and the super critical state hydrogen being obtained by the separation step, the reduction step, and the electrolysis step. 
     
     
         6 . The method for producing methanol as claimed in  claim 5 , with the separation step including separating high temperature/high pressure gaseous carbon dioxide and high temperature/high pressure liquid water from the two-phase coexistence aqueous solution. 
     
     
         7 . The method for producing methanol as claimed in  claim 5 , with the reduction step including reducing the high temperature/high pressure gaseous carbon dioxide in high temperature/high pressure gaseous carbon monoxide and then heating and pressurizing the high temperature/high pressure gaseous carbon monoxide into critical state carbon monoxide. 
     
     
         8 . The method for producing methanol as claimed in  claim 7 , with the reduction step including supplying an electric current of 10-20 A to generate the high temperature/high pressure gaseous carbon monoxide from the high temperature/high pressure carbon dioxide and then compressing the gaseous carbon monoxide at 30 atm and 400 k into the critical state carbon monoxide at 221 atm and 672K. 
     
     
         9 . The method for producing methanol as claimed in  claim 5 , with the electrolysis step including heating and pressurizing the high temperature/high pressure liquid water to the critical state to obtain the critical water and electrolyzing the critical water into the super critical state hydrogen and the super critical state oxygen. 
     
     
         10 . The method for producing methanol as claimed in  claim 9 , with the high temperature/high pressure liquid water in the critical state having a pressure of 221 atm and a temperature of 672, with the super critical state hydrogen and the super critical state oxygen having a pressure of 230 atm and a temperature of 700K. 
     
     
         11 . A device for producing methanol comprising:
 a mixing unit;   a conversion unit connected by a first pipe to the mixing unit, with a first pressurizing member and a first heating member mounted between the conversion unit and the mixing unit, with the conversion unit outputting a critical state gas; and   a synthesis unit connected by a second pipe to the conversion unit, with the second pipe allowing the critical state gas to flow into the synthesis unit, with a gas outlet pipe connected to the synthesis unit, with the gas outlet pipe outputting a synthetic gas in the synthetic unit.   
     
     
         12 . The device for producing methanol as claimed in  claim 11 , with the conversion unit including a separator, a reducer, and an electrolyser, with the separator connected to the reducer by a first branch pipe, with a second branch pipe connected between the separator and the electrolyser. 
     
     
         13 . The device for producing methanol as claimed in  claim 12 , with the synthesis unit connected to the reducer and the electrolyser by first and second gas inlet pipes, respectively. 
     
     
         14 . The device for producing methanol as claimed in  claim 13 , further comprising:
 a second pressurizing member and a second heating member mounted on the second branch pipe; and   a third pressurizing member and a third heating member mounted on the first gas inlet pipe connected between the reducer and the synthesis unit.   
     
     
         15 . The device for producing methanol as claimed in  claim 12 , with the reducer connected to a current supplier, with the current supplier supplying the reducer with electric current. 
     
     
         16 . The device for producing methanol as claimed in  claim 12 , with the electrolyser connected to a current supplier, with the current supplier supplying the electrolyser with electric current. 
     
     
         17 . The device for producing methanol as claimed in  claim 12 , with the electrolyser connected to a storage tank by a gas conveying pipe. 
     
     
         18 . The device for producing methanol as claimed in  claim 17 , with a plurality of heat dissipating members mounted between the electrolyser and the storage tank. 
     
     
         19 . The device for producing methanol as claimed in  claim 12 , with the separator further including an auxiliary heating member, with the auxiliary heating member heating the separator.