摘要
生产浓硝酸的主要工艺为以硝酸镁为脱水剂的浓缩工艺[1],该工艺在生产过程中要排放大量酸性水,通常作为废水经中和处理后排放,硝酸流失同时也需要消耗大量碱液。为此,对浓缩系统进行了理论分析,经AspenONE V7.3优化计算得出,增加回流线并采用沸点进料后,浓度为2%~3%的酸性水在该设备内可浓缩到28%。塔顶稀酸水中硝酸浓度几乎接近零,可以做脱盐水使用,做到酸性水全部回收利用,达到零排放的要求。
Concentration process,which uses magnesium nitrate as the dehydrating agent,is mainly used for the production of concentrated nitric acid. During theproduction,a large quantity of acid water is produced and discharged as wastewater after neutralization,and a large amount of caustic is consumed while nitric acid is lost.This article theoretically analyzes the concentration system and uses AspenONE V7.3in the calculation.It is concluded that the concentration of acid water can be increased from2%~3% to 28.5% after adding a reflux line and using boiling point feedstock.The diluted nitric acid at the top of the tower has a concentration of almost zero and can be used as dematerialized water.All the acid water can be recovered for utilization and the requirement of zero emission can be achieved.
出处
《石油化工设计》
CAS
2015年第1期28-29,6,共2页
Petrochemical Design
关键词
塔尾水
镁尾水
酸性水
硝酸
回收塔
Acid water from concentrated tower
Acid water from magnesium nitrate
Acid water
Nitric acid
Tower for magnesium nitrate solution evaporator
