中国环境科学

作者：黄岩, 朱梓涵, 周子安, 孙小婷, 董黎明, 于素萍

单位：北京工商大学, 中国轻工业清洁生产和资源综合利用重点实验室, 国家环境保护食品链污染防治重点实验室, 北京 100048

关键词：柠檬酸行业,废石膏,CO2,协同矿化,Aspen工艺模拟

基金：国家自然科学基金项目(41861124004)

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.

来源：2024年第11期

《中国环境科学》期刊编辑部

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