Fouling and regeneration of ceramic membranes used in recovering titanium silicalite-1 catalysts
Fouling and regeneration of ceramic membranes used in recovering titanium silicalite-1 catalysts
复制标题
钛硅沸石-1催化剂回收陶瓷膜的结垢与再生
DOI：
10.1016/j.memsci.2007.05.036
复制
发表时间：
2007-09
影响因子：
9.5
通讯作者：
中科院分区：
文献类型：
--
作者：
采用陶瓷超滤膜分离钛硅分子筛TS-1（TS-1）催化剂和环己酮氨肟化制肟的反应液。研究了膜污染的机理和污染膜的再生。结垢主要是由TS-1颗粒沉积、二氧化硅添加剂吸附和铁沉淀引起的。系统中的两种溶质，二氧化硅添加剂和TS-1催化剂之间的相互作用，在膜表面形成致密的滤饼层中起着重要作用，导致TS-1颗粒在超滤过程中更大的通量下降。通过对单个颗粒所受水动力的估算表明，横流速度（CFV）对TS-1颗粒的沉积有重要影响。然而，在颗粒已经沉积之后，增加CFV将不会使它们再悬浮，这是由于形成了强而致密的滤饼层。污染膜的清洗可以通过连续使用强碱性和酸性溶液来实现。此外，还采用了颗粒清洁方法。利用氧化铝微粒的冲刷作用，可以有效地去除膜表面的滤饼层。采用颗粒清洗和酸洗相结合的方法可以有效地恢复膜通量。
Ceramic ultrafiltration (UF) membranes were used to separate titanium silicalite-1 (TS-1) catalysts from slurry in catalytic ammoximation of cyclohexanone to the oxime. Both the fouling mechanisms and the regeneration of fouled membranes were studied. The fouling was mainly caused by TS-1 particles deposition, silica additive adsorption and iron precipitation. The interaction between the two solutes in the system, silica additive and TS-1 catalysts, played a significant role in the formation of dense cake layers at the membrane surface, leading to a greater flux decline during ultrafiltration of TS-1 particles. Estimation of hydrodynamic forces acting on a single particle shows crossflow velocity (CFV) has an important effect on the deposition of TS-1 particles. However, after particles have deposited, increasing CFV will not resuspend them due to the strong and dense cake layer formation. The cleaning of a fouled membrane can be achieved by sequential use of strongly basic and acidic solutions. In addition, a particle-cleaning method was applied. Micro-sized alumina particles were used for their scouring effect to remove the cake layer from the membrane surface effectively. The particle cleaning combined with acid cleaning was effective to fully restore membrane flux.
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DOI：
10.1016/b978-0-12-391927-4.10024-6
发表时间：
1985
期刊：
The European Physical Journal C
影响因子：
--
作者：
J. Israelachvili
通讯作者：
J. Israelachvili
影响因子：
3.5
作者：
S. Sjöberg
通讯作者：
S. Sjöberg
影响因子：
11.4
作者：
Miaomiao Zhang;Chun Xing Li;M. Benjamin;Yujung Chang
通讯作者：
Miaomiao Zhang;Chun Xing Li;M. Benjamin;Yujung Chang
影响因子：
2.8
作者：
Heesu Park;K. Choo;Chung‐Hak Lee
通讯作者：
Heesu Park;K. Choo;Chung‐Hak Lee
影响因子：
9.5
作者：
K. Hwang;Fu-Yuan Chou;K. Tung
通讯作者：
K. Hwang;Fu-Yuan Chou;K. Tung