【摘要】 合成氨厂弛放气中NH₃的回收对提高大气质量和资源利用具有双重意义。常用的水洗法存在吸收不完全和产生大量廉价稀氨水的缺陷，酸洗法又有解吸能耗高和氨资源浪费的不足。基于低共熔溶剂（DES）具有蒸气压低、热稳定好及气体溶解性可调的优点，因此提出了氯化胆碱和尿素摩尔比为1∶2的DES回收弛放气中NH₃的新工艺。基于RK-NRTL的计算方法，利用软件模拟了新工艺的过程。通过灵敏度分析关键工艺参数对结果的影响，优化确定了合理的工艺条件。计算结果表明：新工艺具有良好的吸收效果，NH₃回收率高达99%,净化气中氨的摩尔分数低至4.117×10^-5,达到直排的标准；再生氨的摩尔分数为0.974 4,新工艺相对离子液体[C₄mim]BF₄的吸收氨工艺节能约53.38%。新工艺的设备简单、分离过程高效且节能，具有良好的应用前景。更多还原

【Abstract】 Ammonia recovery from the purge gas of synthetic ammonia plants have significant improvement to atmospheric quality and resource recycle. The conventional water scrubbing method suffers from incomplete absorption and generates a large amount of dilute ammonia solution. The acid scrubbing method has the shortcomings of the high energy consumption and wasted NH₃ resources. With the advantages of deep eutectic solvents（DESs）, including low vapor pressure, good thermal stability and tunable gas solubility, we presented a new process for the recovery of ammonia in purge gas by DES with a 1∶2 molar ratio of choline chloride and urea. Using RK-NRTL calculation method, conditions were simulated and optimized by analyzing the influence of several key process parameters. The results show that the present process has good absorption performance, the recovery of NH₃ is up to 99%, the molar fraction of ammonia in purified gas is as low as 4.117×10^-5, and the regenerated ammonia is 0.974 4, which meets the standard of direct discharge. The new technology saves about 53.38% energy compared with the absorption ammonia process of ionic liquid [C₄mim]BF₄, which has the potential for practical applications because of its simple equipment, efficient and energy-saving separation.更多还原