Dehydrochlorination of poly(vinylidene chloride) in reaction with gaseous ammonia

The kinetics of dehydrochlorination of poly(vinylidene chloride) powder in the reaction with gaseous ammonia at 50-100 degrees C was studied by isothermal calorimetry. The rate of dehydrochlorination was 1.5 wt %/h at 100 degrees C and an ammonia pressure of 500 mmHg and remained virtually unchanged up to high conversions. The effective activation energy is 26.8 kJ/mol and the molar heat of the process is 117 kJ/mol arnmonia. It was found that the ammonia sorption capacity of polymer samples dehydrochlorinated by 50% was nine times that of the initial poly(vinylidene chloride).