Effect of process variables on the single-feed semibatch precipitation of barium sulphate
Effect of process variables on the single-feed semibatch precipitation of barium sulphate
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DOI：
10.1205/02638760152721226
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发表时间：
2001-11
影响因子：
3.9
通讯作者：
E. Uehara-Nagamine;P. Armenante
中科院分区：
文献类型：
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作者：
E. Uehara-Nagamine;P. Armenante
对单料半间歇沉淀法生产硫酸钡进行了试验研究。考察了反应溶液体积比、反应物平均初始浓度、反应物化学计量比、叶轮转速和进料位置等工艺参数对晶粒度分布的影响。此外，还进行了其他实验，以评估进料管中的返混和进料点附近的介混对结晶过程的影响。实验结果可以根据沉淀池中存在的混合比例及其对成核速率(非均相或均相)和晶体生长速度的相对大小的影响来解释。
An experimental study on the single-feed semibatch precipitation of barium sulphate was conducted. The effect on the crystal size distribution of a number of process variables including the volume ratio of reacting solutions, mean initial reactant concentration, stoichiometric ratio of reactants, impeller speed and feed location was investigated. Additional experiments were carried out to assess the effect of backmixing in the feed pipe and mesomixing near the feeding point on the crystallization process. The experimental results can be interpreted on the basis of the mixing scales existing in the precipitation tank and their impact on the relative magnitude of the rates of nucleation (heterogeneous or homogeneous) and crystal growth.