Efficiency of Different Acetylation Methods Applied to Cellulose Fibers Waste from Pulp and Paper Mill Sludge

ABSTRACT

In this study, the viability of acetylation in cellulose fibers waste (CFW) from pulp and paper mill sludge was investigated in comparison to bleached cellulose fibers (BCF). Four acetylation methodologies were applied. The inorganic ash composition of the CFW was determined by Energy Dispersive X-ray Spectrometry (EDS). The Degree of substitution (DS) of the acetylated fibers and their characterization using Fourier Transformed Infrared (FT-IR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA), and Scanning electronic microscopy (SEM) were carried out. Results showed that the different acetylation methods are not effective for the esterification of CFW largely due to a high mineral content in their composition. The acetylation promoted the removal of the inorganic content in the CFW resulting in low efficacy levels. In BCF, higher efficiency levels were achieved, varying according to the methods. The different acetylation methods showed an efficiency range from 0.02 to 1.76 depending on the type of fiber.

摘要

本研究以制浆造纸污泥中的纤维素纤维废料（CFW）为研究对象，以漂白纤维素纤维（BCF）为对照，探讨其乙酰化活性. 采用四种乙酰化方法. 采用能量色散X射线能谱仪（EDS）测定了CFW的无机灰分组成. 采用傅立叶变换红外光谱（FT-IR）、X射线衍射（XRD）、热重分析（TGA）和扫描电镜（SEM）对乙酰化纤维的取代度（DS）进行了表征. 结果表明，不同的乙酰化方法对CFW酯化反应的影响不大，主要是由于它们的组成中含有较高的矿物质. 乙酰化促进了CFW中无机物的去除，导致低效率水平. 在BCF中，根据不同的方法，可以获得更高的效率水平. 不同的乙酰化方法根据纤维类型的不同，其效率在0.02-1.76之间.

KEYWORDS:

• Esterification
• chemical modification
• surface chemistry
• cellulose acetate
• recovered cellulose fibers

关键词:

• 酯化反应
• 化学改性
• 表面化学
• 醋酸纤维素
• 回收纤维素纤维