TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: In (a), the material gas is put in the methanol first-level synthesis device; part of carbon monoxide (CO), carbon dioxide (CO2) and hydrogen gas (H2) in the material gas synthesizes methanol in the first-level synthesis device under condition: pressure is 3.0-31.4 MPa, temperature is 210-270 degrees C; liquid methanol is discharged; the residual gas in the device comprises H2, nitrogen (N2), CO, CO2, methane (CH4), argon (Ar); volume proportion of CO and CO2 is 2.5-10%. Preferred Composition: The volume proportion of CO and CO2 in the material gas is 5.0-28.0%; volume percentage of H2 is 55-75%; volume percentage of N2 is 16-20%; volume percentage of inert gas such as CH4, Ar is 0.1-3.0%. Preferred Process: In (b), it comprises: putting residual CO, CO2 and H2 in the first-level synthesis device into the second-level synthesis device to synthesize methanol under condition: pressure is 3.0-31.4 MPa, temperature is 210-250 degrees C; liquid methanol is separated out; concentration of total volume of the CO and CO2 in residual gas in the second-level synthesis device is no more than 5000 ppm. In (c), it comprises: putting residual CO, CO2, and H2 in the second-level synthesis device into the third-level synthesis device to synthesize methanol or methane under condition: pressure is 3.0-31.4 MPa, temperature is 210-240 degrees C; concentration of total volume of the CO and CO2 in residual gas is no more than 20 ppm. The three methanol synthesis devices can be put in the same pressure level or in the different pressure levels; three methanol synthesis systems adopt flow connected in series; the second-level, third-level methanol synthesis devices can used for synthesizing dimethyl ether (CH3-O-CH3) by reaction of CO, CO2, and H2, and ensure that content of CO+CO2 in gas is no more than 20 ppm; the third-level can be used for synthesizing CH4 and H2O by reaction of CO, CO2, and H2 in material gas and ensure that content of CO+CO2 in gas is no more than 20 ppm. In (d), synthesis ammonia is obtained by following steps: making residual N2 and H2 after three levels synthesizing synthesize ammonia under condition: pressure is 11.0-31.4 MPa, temperature is 360-520 degrees C. In material gas of ammonia synthesis device in (d), volume percentage of H2 is 68-78%; volume percentage of N2 is 18-26%; volume percentage of inert gas such as CH4, Ar is 0.5-4.0%; Ar is gas in material gas; main content of CH4 is gas in the material gas; a little part is gas generated in three methanol synthesis processes; the inert gas such as CH4, Ar accumulated in ammonia synthesis device in (d) is washed by liquid ammonia generated by the ammonia synthesis device in (d); then the inert gas such as CH4, Ar dissolve in the liquid ammonia and discharged with liquid ammonia from the ammonia synthesis device. The 11.0-31.4 Mp of liquid ammonia directly enters into the power cylinder connected to the ammonia synthesis device by washing methane container, pushes the piston of the power cylinder to move down; pressure of liquid ammonia in the power cylinder is reduced to 1.0-4.0 MPa from 11.0-31.0 Mp for closing ammonia valve; when opening ammonia-discharging valve, the liquid ammonia with inert gas such as CH4 and Ar enters into ammonia-storage groove; pressure is reduced, and then CH4, Ar dissolved in the liquid ammonia are separated out; the liquid ammonia in the groove has ability for washing the inert gas such as CH4, Ar; when pressure in the power cylinder is reduced to a certain pressure, ammonia-discharging valve is closed and ammonia-entering valve is opened to push the piston in the power cylinder to move upward; after finishing the operation process, the piston in the power cylinder transfer power of the power cylinder into the piston in the transfer cylinder by the piston rod, drive wheel, eccentric crank and supporting point which are connected to the piston in the power cylinder; then the piston in the transfer cylinder moves upward; at this time, one-way valve for discharging ammonia of the transfer cylinder is closed and one-way valve for absorbing ammonia is opened; the liquid ammonia after absorbed by the ammonia-storage groove is absorbed in the transfer cylinder; when the piston moves to left, ammonia-absorbing valve is closed and ammonia-discharging valve is opened; the liquid ammonia with the inert gas such as CH4, Ar is transferred to the methane washing container to wash the inert gas such as CH4, Ar in circulation gas of synthesis ammonia; when arriving at solution saturation, the liquid ammonia with the inert gas such as CH4 and Ar enters into the power cylinder connected to the ammonia synthesis device again to form next circulation; the whole process makes use of difference energy of the liquid completely so it needs not external power. The washing ammonia device is provided with a power cylinder, a transfer cylinder, a ammonia-storage groove and a methane washing container; the power cylinder and transfer cylinder are composed of the eccentric crank shaft, drive wheel, power lever and supporting point; the ammonia inlet of the power cylinder is connected to the ammonia synthesis device and methane washing container by the pipe; the ammonia outlet of the power cylinder is connected to the ammonia-storage groove; the ammonia-storage groove is connected to the ammonia-absorbing valve of the transfer cylinder; the ammonia-discharging valve of the transfer cylinder is connected to the ammonia washing container; the ammonia-absorbing valve and ammonia-discharging valve are one-way flow controllers.