摘要
介绍二进料口分馏萃取理论的核心内容,包括各段级数的计算方法等。与传统分馏萃取相比较,二进料口的化工试剂消耗下降且其降幅随进料比增加而增大,当进料比为1时,洗酸的消耗下降了50%。采用动态模拟法研究二进料口分馏萃取体系的产品纯度变化、各段积累量和级样分布的特性。研究表明:二进料口分馏萃取体系的2个产品均能够较快地达到纯度设计指标,即更容易同时获得2个高纯产品,是制备高纯产品的良好技术方法。在二进料口分馏萃取体系中,组分在萃取段和洗涤段的积累只需较少的萃取排数即可直接进入稳态;但是,当萃取排数较低时组分在萃洗段的积累则先进入假稳态,当萃取排数较高时才真正进入稳态。二进料口分馏萃取稳态的级样分布遵循递增规则和递减规则,而且每条分布曲线分别在每个进料级均各有一个转折点。
The essential contents of the proposed theory including the calculation of extraction stage numbers of the fractional extraction system with two inlets were introduced. Compared with traditional fractional extraction, the chemical consumption of the novel fractional extraction with two inlets decreases significantly, and the decreasing amplitude amplifies as the feed ratio increases. For example, when the feed ratio is 1, the scrubbing acid consumption drops by 50%. The variation of product purities, component accumulation in each section and component distribution in each extraction stage were investigated by dynamic simulation on a computer. The results indicate that the two products attain respective desired purities using fractional extraction with two inlets are much faster than those using traditional fractional extraction. Hence, the novel extraction system is a superior technology to prepare two high purity products at same time. In a fractional extraction system with two inlets, the component accumulation both in extraction section and scrubbing section enter into steady state directly with less extraction row number. In addition, the component accumulation in extract-scrubbing section access into pseudo steady state with less extraction row number first and then into genuine steady state with much more extraction row number. The component distribution in each extraction stage of the fractional extraction system with two inlets follows the increasing rule and decreasing rule. Moreover, two turning points appear in each distribution curve at the two feed stages, respectively.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2016年第10期2205-2213,共9页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(21461016)
江西省科技支撑计划资助项目(20132BBE50007)~~
关键词
分馏萃取
二进料口
动态特性
计算机模拟
fractional extraction
two inlets
dynamic characteristics
computer simulation
