反应Ⅰ:CO2(g)+3H2(g) CH3OH(g)+H2O(g) △H1=-49.6 kJ/mol
反应Ⅱ:CH3OCH3(g)+H2O(g) 2CH3OH(g) △H2=+23.4 kJ/mol
反应Ⅲ:2CO2(g)+6H2(g) CH3OCH3(g)+3H2O(g) △H3