Characterization of the filter cake drainage resistance coefficient for cellulose nanofibril suspensions

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2024-11-27 DOI:10.1007/s10570-024-06308-7

Bright Appiah, Jinwu Wang, Mehdi Tajvidi, Douglas W. Bousfield

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Abstract

The dewatering of cellulose nanofibril (CNF) suspensions is important in several processes such as concentrating the material before transportation, producing dry CNFs for composite structures, and applying the material to the surface of a paper web. Dewatering of a CNF suspension onto paper is one possible way to form a CNF layer on paper to produce excellent grease and oil-resistant packaging materials. Even though this property of the CNF suspension is important, little work has been reported in the literature to model and characterize this process. Refiner produced CNF suspensions were filtered on cellulose acetate membranes, filter paper, and paperboard in a standard Büchner funnel with a known vacuum pressure. The volume filtered as a function of time was recorded and the equation for constant pressure filtration was used to fit the results for various initial concentrations and different qualities of CNFs. The specific cake resistance coefficient (α) was obtained from the results. The results revealed the dewatering of CNFs follows the filtration theory well with an R² value greater than 0.98. Increasing the quality or degree of fibrillation of the CNFs gave a small increase in the specific cake resistance. The specific cake resistance obtained was able to predict the dewatering of a CNF suspension on a paperboard in a bench scale sheet former. Significant clogging of the base membrane or paper was found to occur, especially for the cellulose acetate membranes. These results provide insights regarding CNF dewatering and the basis for the design of filtration-based dewatering equipment as well as the operation of wet end processes that deposit CNFs onto the web.

Graphical abstract

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纤维素纳米纤维悬浮液滤饼排水阻力系数的表征

纤维素纳米纤维（CNF）悬浮液的脱水在运输前的浓缩、为复合结构生产干燥的CNF以及将材料应用于纸网表面等几个过程中都很重要。将CNF悬浮液脱水到纸上是在纸上形成CNF层以生产优异的润滑脂和耐油包装材料的一种可能方法。尽管CNF悬浮液的这一特性很重要，但文献中很少报道对这一过程进行建模和表征。精炼厂生产的CNF悬浮液在醋酸纤维素膜、滤纸和纸板上过滤，在已知真空压力的标准b chner漏斗中过滤。记录过滤体积与时间的关系，用恒压过滤方程拟合不同初始浓度和不同质量CNFs的结果。由结果得到了比饼阻力系数（α）。结果表明，CNFs的脱水符合过滤理论，R2值大于0.98。增加纤维纤维的纤维化质量或纤维化程度，可使比饼电阻小幅增加。所得的比饼阻力能够预测在台式成纸机中CNF悬浮液在纸板上的脱水情况。发现基膜或纸发生明显堵塞，特别是醋酸纤维素膜。这些结果提供了关于CNF脱水的见解，以及基于过滤的脱水设备的设计基础，以及将CNF沉积到网络上的湿端过程的操作。图形抽象

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.