关键词: 二氧化碳, 过程控制, 计算机模拟, 碳酸铵, 碳酸氢铵, 碳化度

Abstract: Ammonia carbonation product control is the key of calcium sulfate conversion at low temperature for utilization of sulfur resources.Aspen plus software was used to simulate ammonia carbonation process.The results indicate that carbonate converts gradually into bicarbonate with increasing temperature from 273.15 K to 338.15 K. The conversion from bicarbonate to carbonate occurs at 0.01—0.13 MPa,but ammonia carbonation has no affect when pressure is above 0.13 MPa. If ammonia mole fraction is less than 0.04,bicarbonate mole fraction in products will be close to 1. When ammonia mole fraction is 0.1—0.15 or ratio of reaction ammonia to carbon oxide 2.2—2.8,carbonate is the major product of carbonation.If ammonia mole fraction is above 0.15,effect of ammonia concentration on ammonia carbonization is little.When ratio of reaction ammonia to carbon oxide is higher than 2.8,There will be more than 90% of ammonium bicarbonate in solution.On the basis above,control conditions of temperature-ammonia concentration,temperature-ratio of reactive ammonia to carbon dioxide were pointed out for preparing high contents of ammonium bicarbonate or ammonium carbonate.

Key words: carbon dioxide, process control, computer simulation, ammonium carbonate, ammonium bicarbonate, ammonia carbonation