Methanation Technology

Hydrogenation Reaction

CO+3H2=CH4+H2O+206.16KJ

CO2+4H2=CH4+2H2O+165.08KJ

This reaction is a strong exothermic reaction. In the presence of oxygen, oxygen and hydrogen react to form water. When the temperature is lower than 200°C, the nickel in the methanation catalyst will react with CO to form nickel carbonyl: Ni+4CO=Ni(CO) 4

Therefore, it is necessary to avoid the contact of CO and nickel catalyst at low temperature, so as not to affect the activity of the catalyst. The reaction equilibrium constant of methanation decreases with the increase of temperature. As a methanation technology for purifying and removing CO and CO2, the reaction temperature is generally between 280 and 420°C, and the equilibrium constant value is very large. At 400°C and 2.53Mpa pressure Under the calculation, the equilibrium content of CO and CO2 is at the level of 10-4ppm.

The inlet temperature increases, the amount of catalyst is reduced, and the pressure drop and power consumption are greatly reduced.This partial technology has been particularly mature in China, and applied for many years.

At present, methanation technology has been used in large-scale synthesis of natural gas, so the biggest problem is the temperature resistance of the catalyst and the design and manufacture of a strong exothermic reactor.