Abstract:

A new method was proposed to prepare the derivative of urea and simultaneously to generate ammonia, which was utilized for desulfurization and reduction of NO_x of flue gas. In a series of urea reactions, the reaction by which  urea was heated by microwave to prepare cyanuric acid was chosen to investigate the effect of the mass ratio of reactants, microwave power and reaction time on the reaction.The best reaction condition was obtained with the mass ratio of urea to ammonium chloride of 36∶1, heated by high power microwave for ten minutes, and refined by boiling in acid solution. The productive rate of the reaction was 70％. Compared to  existing ammonia preparation technology by urea,this technology had the advantage of no emission and could prepare  high valueadded urea derivatives.

Key words: the ammonia process for SOx removing, selective catalytic reduction of NO_x, ammonia production by urea, cyanuric acid, microwave