Solid-liquid mass transfer and wetting factors in trickle bed reactors: Effect of the type of solid phase and the presence of chemical reaction
Solid-liquid mass transfer and wetting factors in trickle bed reactors: Effect of the type of solid phase and the presence of chemical reaction
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DOI：
10.1080/00986449808912720
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发表时间：
1998-10-01
影响因子：
2.5
通讯作者：
Pironti, F
中科院分区：
文献类型：
--
作者：
Gonzalez-Mendizabal, D;Aguilera, ME;Pironti, F
在气液同时向下流动的固定床三相反应器（涓流床反应器）中，实验测定了固体在有化学反应和无化学反应的液体中溶解的固液润湿因子f。所采用的方法是将两相（液气两相）在床内循环时得到的体积固液传质系数与保持液体固有速度不变的液体全床条件下得到的体积固液传质系数进行比较。化学体系选择为苯甲酸和乙酰水杨酸为固相，水和氢氧化钠为水溶液，大气为空气。实验中对两相的流动进行了修改，得到了f与液体的流动和含率的直接关系。在研究的流态中，气体流动对f的影响并不重要，被定义为低相互作用流态。此外，润湿因子不受溶质性质和化学反应的影响。
The solid-liquid wetting factor, f, for solid dissolution in a liquid with and without chemical reaction was experimentally determined in a fixed bed three-phase reactor with downward concurrent gas and liquid flows (Trickle Bed Reactor). The method employed consisted of comparing the volumetric solid-liquid mass transfer coefficient obtained when two phases (liquid and gas) circulated through the bed, with those coefficients obtained at liquid full bed conditions, maintaining the intrinsic liquid velocity constant. The chemical system selected was benzoic acid and acetylsalicylic acid as solid phases, water and sodium hydroxide in aqueous solution, and atmospheric air. Experiments were carried out in which the flow of both phases was modified, obtaining a direct dependency of f with the flow and holdup of liquid. The gas flow effect over f was not important in the flow regime studied, defined as the low interaction regime. Furthermore, the wetting factor is not affected by the nature of the solute and by the presence of a chemical reaction.