摘要：
在化工、船舶等工业领域，高温冷凝水回用作锅炉补给水可显著降低系统水耗与锅炉制蒸汽能耗，但其中乳化油的高效脱除是高温凝结水回用的瓶颈问题。采用两步合成法，首先在脱脂棉表面键合Fe3+，进而键合油酸根离子，成功构建出具有均匀、稳定亲油疏水表面的改性脱脂棉，该合成方法具有工艺简单、绿色、可放大等优点。改性后脱脂棉的水接触角为138.7°，具有良好的疏水/亲油选择性。在30~90 ℃温度范围内，改性后脱脂棉对100 mg/L含油废水表现出良好水油分离效率，即使在90 ℃温度下，水中油分去除率也超过90%。在搭建的模拟高温凝结水除油中试装置内，在温度70 ℃、进水通量5.43 m3/（m2·h）、进水含油质量浓度100 mg/L工况下，改性脱脂棉滤芯在运行6 h后除油率仍超85%，远超MYCELX进口滤芯，满足了规模化应用对大通量除油滤芯的需求。此外，Fe3+与脱脂棉基质形成了较稳定的化学键，除油过程中未发生析出反应，对高温凝结水无二次污染。
关键词:
改性脱脂棉,
高温凝结水,
油水分离,
油酸,
铁离子
Abstract:
In chemical industry, ships and other fields, the reuse of high temperature condensate water as boiler feed water can not only reduce the water consumption, but also save the energy consumption for steam production in the boiler. However, efficient removal of the emulsified oil is the bottleneck for the reuse of high temperature condensate water. Using a two-step synthesis method, iron ions were firstly bonded to the surface of defatted cotton fabrics, followed by the bonding of oleate ions, resulting in the successful construction of modified defatted cotton fabrics with a uniform, stable, oleophilic, and hydrophobic surface. This synthesis method had the advantages of simple process, greenness, and scalability. The water contact angle reached 138.7° for the modified defatted cotton fabrics, indicating good hydrophobic/oleophilic selectivity. Within the temperature range of 30-90 ℃, the modified defatted cotton fabrics exhibited good water-oil separation efficiency for 100 mg/L oily wastewater, and even at 90 ℃, the removal rate of oil in water exceeded 90%. In the pilot test of removing emulsified oil from the simulated high temperature condensate water, the oil removal efficiency of the modified defatted cotton filter was still over 85% even after 6 h, under the conditions of 70 ℃, inlet flow rate of 5.43 m3/(m2·h), and inlet oil content of 100 mg/L, far exceeding the imported MYCELX filter, which could meet the demand for large flux oil removal filters for large-scale applications. In addition, the iron ions formed a relatively stable chemical bond with the cotton matrix, and no leaching of iron ions occurred during the treatment process, avoiding the secondary pollution of the high temperature condensate water.
Key words:
modified defatted cotton fabrics,
high temperature condensate water,
oil-water separation,
oleic acid,
iron ion
中图分类号:
刘伟萍, 王李锋, 胡智华, 鄢恒飞, 刘晓锋, 刘勇, 程梓绅, 江波. 疏水改性脱脂棉对高温凝结水的深度除油性能[J]. 工业水处理, 2025, 45(9): 131-136.
Weiping LIU, Lifeng WANG, Zhihua HU, Hengfei YAN, Xiaofeng LIU, Yong LIU, Zishen CHENG, Bo JIANG. Hydrophobic modified defatted cotton for advanced oil removal from high-temperature condensate water[J]. Industrial Water Treatment, 2025, 45(9): 131-136.