Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, State Environmental Protection Key Lab of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
摘要 To achieve efficient synergy in carbon capture and utilization of waste gypsum in the citric acid industry, this study was based on the CO2 emission characteristics of citric acid production process, and conducted a study on the process conditions of using ammonium chloride leaching waste gypsum solution to absorb CO2. Aspen Plus was also used to simulate the synergistic mineralization process. The results showed that approximately 20L of waste gas containing 80% CO2 (V/V) was generated from 1L of citric acid fermentation broth. When the initial concentration of ammonium chloride was 2mol/L and the waste gypsum was leached for 100minutes, the Ca2+ concentration could reach 0.062mol/L. Based on the optimized absorption process conditions, mineralization of 33% CO2 can be achieved and approximately 192g CaCO3/kg anhydrous citric acid can be produced. The simulation results of the fully mixed reactor process using Aspen Plus showed that when the CO2 inlet flow rate was controlled to be 0.6kmol/h and the appropriate ammonia and gypsum inlet flow rates were controlled, a mineralization rate of 96.4% for CO2 and 100% for gypsum conversion can be achieved, and the synergistic mineralization effect was the best.
Abstract：To achieve efficient synergy in carbon capture and utilization of waste gypsum in the citric acid industry, this study was based on the CO2 emission characteristics of citric acid production process, and conducted a study on the process conditions of using ammonium chloride leaching waste gypsum solution to absorb CO2. Aspen Plus was also used to simulate the synergistic mineralization process. The results showed that approximately 20L of waste gas containing 80% CO2 (V/V) was generated from 1L of citric acid fermentation broth. When the initial concentration of ammonium chloride was 2mol/L and the waste gypsum was leached for 100minutes, the Ca2+ concentration could reach 0.062mol/L. Based on the optimized absorption process conditions, mineralization of 33% CO2 can be achieved and approximately 192g CaCO3/kg anhydrous citric acid can be produced. The simulation results of the fully mixed reactor process using Aspen Plus showed that when the CO2 inlet flow rate was controlled to be 0.6kmol/h and the appropriate ammonia and gypsum inlet flow rates were controlled, a mineralization rate of 96.4% for CO2 and 100% for gypsum conversion can be achieved, and the synergistic mineralization effect was the best.
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