Study on the separation of emulsified oil and fouling mechanism by deacetylated cellulose scetate membrane

doi:10.16085/j.issn.1000-6613.2020-1508

Abstract

Abstract:

In this research, the cellulose acetate membrane (CA fiber membrane) was produced by electrostatic spinning, and the prepared CA membrane was modified by added TiO₂ powder and deacetylated cellulose acetate (d-CA). After, the membrane filtration characteristics, permeation flux, removal efficiency of oil/water emulsion and membrane resistances were discussed. The results showed that the thermal stability and superhydrophilicity of the modification CA fiber membrane could be improved by TiO₂ and D-CA, and the stable water and filtration flux were obtained. In operation conditions at 40kPa and 60 minutes, the TiO₂@d-18.5%CA membranes were good membrane with water flux, filtration flux, removal efficiency of oil/water emulsion and backwash flux of 824.8L/(m²·h), (311.3±12.5)L/(m²·h), 93.6%±1.1% and 451.5L/(m²·h), respectively. The addition of TiO₂ might lead to an increase in the irreversible resistance ratio of oil on the membrane surface. However, the d-CA modified could reduce the fiber membrane resistance and increase the proportion of reversible resistance, and improve the potential of CA fiber membrane in oil-water separation.

Key words: electrostatic spinning, cellulose acetate fiber membrane, oil-water emulsion, deacetylated cellulose acetate (d-CA)

摘要：

利用静电纺丝制造乙酸纤维素膜（CA纤维膜），并利用添加TiO₂及脱乙酰基（d-CA）对CA纤维膜进行改性，后续对膜过滤特性、渗透通量、油水乳化液去除效率、反洗特性及积垢机制进行讨究。结果显示，CA纤维膜通过TiO₂及d-CA改性后可以提高膜的热稳定性及亲水性能，并得到稳定的纯水通量和过滤通量；最佳的比例为TiO₂@d-18.5%CA纤维膜，在40kPa跨膜压差、60min的操作条件下，其纯水通量、过滤通量、1g/L油水乳化液去除效率以及反洗后通量分别为824.8L/(m²·h)、(311.3±12.5)L/(m²·h)、93.6%±1.1%、451.5L/(m²·h)；另外，添加TiO₂可能导致油水乳化液在膜表面不可逆阻力比例的增加，脱乙酰基改性CA纤维膜则可以降低膜自身阻力及增加可逆阻力的比例，提高CA纤维膜在油水分离方面的潜力。

关键词: 静电纺丝, 乙酸纤维素薄膜, 油水乳化液, 脱乙酰基

CLC Number:

RAU Juiyeh, MAO Zhujian, LIN Xiaoyu, GUO Shaoying, HU Jiapeng. Study on the separation of emulsified oil and fouling mechanism by deacetylated cellulose scetate membrane[J]. Chemical Industry and Engineering Progress, 2021, 40(10): 5415-5423.

饶瑞晔, 毛竹简, 林晓榆, 郭绍英, 胡家朋. 脱乙酰基改性乙酸纤维薄膜对乳化油分离及积垢机理的探究[J]. 化工进展, 2021, 40(10): 5415-5423.

Figures/Tables 10

References 29

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膜编号	CA /%	TiO₂ /g	丙酮 /mL	DMAC /mL	NaOH /mol·L^-1
M1（17%CA）	17	0	13.3	6.7	0
M2（TiO₂@17%CA）	17	0.1	13.3	6.7	0
M3（TiO₂@d-17%CA）	17	0.1	13.3	6.7	0.5
M4（18.5%CA）	18.5	0	13.3	6.7	0
M5（TiO₂@18.5%CA）	18.5	0.1	13.3	6.7	0
M6（TiO₂@d-18.5%CA）	18.5	0.1	13.3	6.7	0.5
M7（20%CA）	20	0	13.3	6.7	0
M8（TiO₂@20%CA）	20	0.1	13.3	6.7	0
M9（TiO₂@d-20%CA）	20	0.1	13.3	6.7	0.5

膜编号	CA /%	TiO₂ /g	丙酮 /mL	DMAC /mL	NaOH /mol·L^-1
M1（17%CA）	17	0	13.3	6.7	0
M2（TiO₂@17%CA）	17	0.1	13.3	6.7	0
M3（TiO₂@d-17%CA）	17	0.1	13.3	6.7	0.5
M4（18.5%CA）	18.5	0	13.3	6.7	0
M5（TiO₂@18.5%CA）	18.5	0.1	13.3	6.7	0
M6（TiO₂@d-18.5%CA）	18.5	0.1	13.3	6.7	0.5
M7（20%CA）	20	0	13.3	6.7	0
M8（TiO₂@20%CA）	20	0.1	13.3	6.7	0
M9（TiO₂@d-20%CA）	20	0.1	13.3	6.7	0.5

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