Based on analyzing the foaming reasons of desulfurization and decarbonization solution for natural gas,the defoaming abilities of different kinds of defoamers are compared and analyzed by means of a foaming pipe experimental device,with foam layer height h and defoaming time t as evaluating indicators. The defoamer DF-2 is selected out as the suitable defoamer.The influences of the dosage amount of defoamer,MDEA concentration,temperature of solution,times of regeneration and concentration of Fe S impurity o...