亚硝酸钠生产新工艺及模拟  

New Technology and Its Simulation of Sodium Nitrite Process

作　　者：席方柱[1] 谈遒[1] 袁继堂[1] 汪宝和[1] 田红兵[1] 

机构地区：[1]天津大学石化技术开发中心,天津300072

出　　处：《化学工业与工程》2003年第4期219-224,242,共7页Chemical Industry and Engineering

摘　　要：提出了一个以硝酸尾气中和液为原料的连续亚硝酸钠生产工艺,新工艺具有如下特点:采用多效连续逆流蒸发流程;一效蒸发器采用液浸式,其余蒸发器采用降膜式;利用一效出口溶液的压力进行闪蒸结晶。建立了包括蒸发器、换热器和闪蒸结晶器的全流程模型。用牛顿-拉夫森法完成了过程模拟计算。模拟结果表明了新工艺的可行性,与国内普遍采用的间歇蒸发-冷却结晶工艺比较,可以节约较多的加热蒸汽。A continuous technology is presented to producing sodium nitrite from the neutralized Na2CO3 solution by tail gas of nitric acid production.The new technology has some new characters,such as:①multi-effect continuous countercurrent evaporation process in adopted;②The first effect evaporator is liquid-immersed type,the others are fall-film evaporators;③flashing crystallization is used by utilized the high pressure of the first effect evaporator.A model of the whole process,which contains evaporator,heat exchanger and flashing crystallization is established.The simulative computation is accomplished by NR method.The result demonstrates the feasibility of the new technology and the economization in heating vapor consume in comparison with the batch evaporation-cold crystallization process that is common in our country.

关 键 词：亚硝酸钠 多效蒸发 闪蒸结晶 数学模型 

分 类 号：TQ131.12[化学工程—无机化工]