【作者】 蔡江；

【导师】 赵景利；

【作者基本信息】 河北工业大学 ， 化工过程机械， 2005， 硕士

【摘要】 本文以浙江大洋化工有限公司离子交换法生产碳酸钾免碳化工艺为背景,对离子交换法碳酸钾生产中挥氨工艺进行了研究和改革,将原有单效蒸发挥氨改进为真空加热吹脱挥氨工艺。进行了常压加热挥氨、真空加热挥氨、静态常压加热吹脱挥氨和静态真空加热吹脱挥氨四种工艺方法的实验研究,并对填料塔动态吹脱法挥氨进行了探索实验研究。研究了各工艺条件下NH4+离子和HCO3离子的分解规律,并对离子交换液温度、操作时间、气相压力和吹脱气量和初始浓度等因素对离子分解的影响进行了研究。在这些挥氨工艺方法中,NH4+离子和HCO3-离子的分解率由低到高的顺序皆为:常压加热挥氨,真空加热挥氨,静态常压加热吹脱挥氨,静态真空加热吹脱挥氨。研究结果表明,在实验条件下离子交换液的温度、挥氨时间、气相压力改变和吹脱气量(对同量液体)对NH4+离子和HCO3-离子的分解率影响显著,初始浓度高低对分解率的影响相对较小。通过实验研究,认为真空加热吹脱法是离子交换法生产碳酸钾挥氨最合宜的工艺方法,离子交换法碳酸钾生产工艺中挥氨的合理工艺参数为:离子交换液温度343K,吹脱气流量0. 1m3/h(处理液体300ml),真空度0. 03MPa,挥氨时间1. 5h。更多还原

【Abstract】 The paper took the production of potassium carbonate with non-carbonization ion-exchange method as the background. The ammonia volatilization process in the production of potassium carbonate was studied and reformed. The former single effect evaporation method was substituted by air stripping at vacuum process.In the article ,heating at normal pressure, heating at vacuum, heating stripping at normal pressure and heating stripping at vacuum were studied. Stripping with padding tower was also studied exploringly. The decompose rule of NH4+ and HCO3- and the influence of temperature, time, pressure, air flux, initial concentration ect. were studied. The decompose order of NH4+ and HCO3- were: heating at normal pressure, heating at vacuum, heating stripping at normal pressure, heating stripping at vacuum. It has been found that solution temperature, time, change of pressure, air flux (to the same solution)had great influence to the decomposition of NH4+ and HCO3-, but initial concentration had relative little influence in the range of the study.Heating stripping at vacuum was the most convenient process of ammonia volatilization in the production of potassium carbonate with ion-exchange. The suitable parameters were: temperature,343K; volatization time,1.5h; air flux ,0.1m /h(for 300ml material solution ); vacuum,0.03Mpa.更多还原