摘要
介绍了连续多级逆流分步结晶过程的原理和特点．在D＝50mm×1050mm结晶塔中，进行了改变进料浓度、回流比、晶体床层高度、产品纯度等参数的实验，研究了其内在规律．在原料的质量分数w为68．550％～94.187％、回流比为1.0～4．7、晶体床层高度为200～900mm范围内，得到的产品纯度均超过99．0％，产量达到6．89t／a．并在实验中得到了纯度为99．999％的高纯产品．本过程的能耗仅相当于精馏的7％左右，且可利用工厂的废热、余热等低阶能源．操作费用与精馏相比微乎其微，设备投资也比精馏低．文中还提出了连续多级逆流分步结晶过程的数学模型，并通过实验数据验证了其正确性．
The principle and characteristic of continuous multistage fractionalcrystallization process are introduced. A large amount of cxprimental work has been doneon the crystallization process in a D = 50 x 1050mm column. The effecfts of operation con-ditions including the composition of feed, reflux ratio and the bed height of crystal oncrystallization were sysmatically studied. The experiments hoshowed that the purity ofproduct can casily exceed99.0% at the rang of feed composition amongw=68.550%-94.187%, reflux ratio among1.0-4.7, the crystal beel height among200-900mm and theyield can achieve6.89tons per year. The purity of product even achieved99.999% in sometimes of experiment. The energy consumption of this process is only about7% of that ofdistillation and it can make use of the lower testageture energy such as used heat, wasteheat and after heat et cetera in chemical plant and its operating cost is much lower than dis-tillation process. Its equipment investment cost is also lower than distillation's. Themathematical model of continuous moultistage countercurrent fractional crystallization pro-cess was also acdvanced and agreed well with experimental data in this paper.
出处
《北京化工大学学报（自然科学版）》
CAS
CSCD
1997年第1期1-8,共8页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
关键词
结晶
传质
提纯
分离
连续多级逆流
: crystallization
fractional
continuous
mass transfer
purification
