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  • 學位論文

改變配方組成製備碳化矽薄膜及在薄膜乳化之應用

Manufacturing silicon carbide membrane by different formula compositions and its application in membrane emulsification

指導教授 : 鄭東文

摘要


本研究使用燒結法製備多孔性碳化矽薄膜應用於薄膜乳化,探討不同比例之黏著劑、助燒結劑和成孔劑對於薄膜性質之影響,進而控制薄膜的孔徑與其分布,並探討不同操作條件下對於薄膜乳化之成果。 實驗使用單軸壓錠成型與高溫爐進行燒結成膜,分析不同製膜條件對於薄膜微結構、膜機械強度、孔洞尺寸分布、孔隙度與晶相成份之影響。在薄膜乳化實驗部分,經由分析液滴尺寸、Span Value與分散相通量,探討不同製膜條件與操作條件對薄膜乳化成果之影響。最後進行薄膜清洗確認薄膜重複利用的可能性。 研究結果顯示,當黏著劑添加量變多,造成Span Value增加 23%,但會使孔隙率下降。當助燒結劑添加量變多,造成薄膜提升49%的機械強度且縮小59%的乳化液滴尺寸,但會使孔隙率下降。當成孔劑添加量變多,造成提升60%的分散相通量,但會使薄膜表面出現大孔洞使Span Value上升。操作條件在透膜壓差80 kPa,使用SDS當作界面活性劑以及低分散相黏度時,能夠有最佳乳化結果。而使用0.2 wt%的Derquim LM 03清潔劑水溶液以250kPa逆洗後,回復率高達近89%,是有效的清潔方法。

並列摘要


In this study, SiC-base inorganic membranes were fabricated via uniaxial pressing, followed by sintering at 1350℃. The effects of adhesive, sintering aid and pore former additions on the membrane properties were thoroughly investigated. Accordingly, membrane pore size and pore size distribution were controlled through adjusting additive amounts. The membranes were further evaluated with regards to their structural properties, pore characteristics and cleaning was used to confirm the possibility of reusing in the membrane emulsification. The results show that with the increase of adhesive additive amounts, Span value increased by 23%, while its porosity decreased. Additionally, membrane mechanical strength was enhanced by 49% under higher sintering aid concentrations, accompanied by the reduction of membrane porosity and oil droplet size by 59%. When the concentration of pore former was increased, although the dispersed phase flux increase by 60%, but it caused the broad of oil droplet size distributed, and larger pores appeared on the membrane surface. In this study, the optimum emulsification performance was obtained under the transmembrane pressure of 80 kPa and a lower dispersion phase viscosity with the use of SDS as a surfactant. High flux recovery rate of 89% was obtained after backwash cleaning with 0.2 wt% of Derquim LM 03 aqueous solution, verifying the effectiveness of this cleaning method.

參考文獻


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