以奈濾自液態染料生產製程中除鹽

Desalination of Process Solution in the Production of Liquid Dyes by Nanofiltration

林文琴(Wei-Chin Lin)

指導教授 ： 莊瑞鑫

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

本研究以奈濾的方式，去除反應性液態染料（R BK-5）生產製程中的鹽類等物質，以達到製程濃縮、脫鹽、純化的目的。選擇適當的膜材，探討在各種不同之染料及鹽進料濃度下各種操作變數對染料截留率、鹽去除率與體積通量之影響，並探討在實驗過程中，濃縮液在色差、色相上是否產生差異，利用高壓染色機進行染色實驗。
由實驗結果顯示，雖然GE、DK、DL膜其MWCO皆小於1000，GE膜的染料通量最大，其次是DL膜，最小的是DK膜；對於滲透端鹽的濃度，則分別為GE＞DL＞DK；染料截留率GE＜DL＜DK，若以實用的觀點，以DL膜具有通量較大又具容許之截留率，較符合連續操作的需求。
本實驗條件範圍：操作壓力2.5-4.0 kg/cm2，染料進料濃度1-10 g/L，鹽進料濃度1-50 g/L，操作溫度為常溫、無連續循環條件下，得到的結果為(1)純鹽水的通量與進料壓力成正比，與進料濃度成反比。(2)染料/鹽混合液中NaCl的截留率隨著壓力增加（滲透液的體積增加）而增加，隨鹽和染料濃度上升而下降。(3)在NF程序中，染料與食鹽混合液的體積滲透通量隨染料、鹽濃度上升而下降，隨壓力增加而增加，染料截留率隨染料進料濃度、NaCl進料濃度和壓力的上升而下降。(4)在低染料進料濃度和低鹽混合液，其滲透通量和截留率取決於壓力的大小而增減，高鹽量溶液的通量和滲透率則是染料濃度效應大於鹽濃度和壓力效應(5)鹼性溶液(pH 10.5)中R BK-5和NaCl的截留率大於酸性溶液(pH 5.0)。總體而言，使用奈濾膜過濾染料的截留率達94%以上，NaCl的截留率0.5-5.0%，染料液在NaCl和Na2SO4兩種鹽混合效應下，SO42-的截留率則有70%。

關鍵字

奈濾 ； 染料 ； 鹽

並列摘要

Abstract
The desalination is important for the reactive dye manufacturing process. Nanofiltration was investigated for removal of the salt. In this study, DK, DL, and GE nanofiltration membranes were tested to manage reactive dye bath effluents. Reactive Black 5 (R BK5) and NaCl were used in the experiments to prepare the synthetic dye and salt mixtures. Effects of feed dye concentration, salt concentration, and transmembrane pressure on the permeate flux and rejection of dye and salt were investigated.
As the experimental data shown that dye rejection of lower than 94% is obtained from GE membrane, but 97% were achieved for the DL membrane. The dye and salt rejection were in the order: GE

並列關鍵字

Nanofiltration ； Dye ； Salt

參考文獻

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