A novel solvent-assisted vapor absorption based headspace analysis technique for the determination of diffusion and solid–air partition coefficients of methanol in paper materials

Zhang, Chunyun; Chai, Xin‐Sheng; Barnes, Donald Grove

doi:10.1016/j.fluid.2015.04.028

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…As expected, the diffusion kinetics of EtOH and CH 2 Cl 2 show two different behaviors on chemically treated and untreated samples. The EtOH diffusion curve is increasing as already seen before for methanol 25 and similar to the one found for the water. The absorption is fast at the beginning of the test.…”

Section: Uptake Of Dichloromethane and Etoh Liquidsupporting

confidence: 86%

Print base decorative paper with high‐dimensional stability by chemical fiber modification: An experimental and analytical approach

Barletta

Gisario

Mohammadzadeh

2020

J of Applied Polymer Sci

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The main structural component of wood fibers is cellulose, which, being highly hydrophilic, interacts with water. Cellulose-based paper has, therefore, the same affinity with water. However, for most products such as decorative paper, this is more of a disadvantage, where water uptake both as liquid and from humid air not only weakens the paper by breaking hydrogen bonds but also alters its dimension and stability over time. The dimensional stability (ability of the paper to retain the size as its moisture content changes) is a critical parameter when the paper is submitted to printing, copying, and converting operations. Humidity can cause sheet wrinkling or warping, thus compromising the processability and the results achievable. The modification of fibers with chemical additives can be a way to improve the performance of paper against water and water vapor uptake. For this reason, several tests of horizontal diffusion of solvents were carried out to evaluate the change in uptake of as-is paper and of papers modified by several different chemical treatments. Solvent uptake tests were performed to assess the interaction of chemically treated and untreated papers with water, dichloromethane, and ethanol. Diffusion mechanisms of the solvents flow within the fiber networks and their movement through the porous solids were analyzed. The chemical treatments of the fiber with silane, siloxane, and polyelectrolyte multilayer were found to considerably influence both solvent contact angles and absorption times of the papers, thus affecting the rate of solvent (more interestingly, of the water) diffusion into the fiber wall. By comparing all the treated and untreated samples, the contact angles with the solvents decreased by performing siloxane, oligosiloxane, and silane treatments. More specifically, the diffusivity rates of water decreased because of the disappearance of a fraction of the hydrophilic sites and the onset of higher crystallinity regions on the paper sheets.

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Section: Uptake Of Dichloromethane and Etoh Liquidsupporting

confidence: 86%

Print base decorative paper with high‐dimensional stability by chemical fiber modification: An experimental and analytical approach

Barletta

Gisario

Mohammadzadeh

2020

J of Applied Polymer Sci

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“…The material balance relationship in the closed headspace vial, the dynamic concentration of the analyte can be written as Equation () according to Zhang 34

C_{g} ((), t) goodbreak= \frac{m_{0}}{γ} 1 goodbreak- e^{- χ * γ * t},

…”

Section: Methodsmentioning

confidence: 99%

Emission characteristics of volatile organic compounds from regenerated PET fibers based on the headspace gas chromatograph

Liu

Shi

et al. 2022

J of Applied Polymer Sci

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The emission behaviors of volatile organic compounds (VOCs) can be characterized by the key parameters: the initial concentration (m0), partition coefficient (K) and the diffusion coefficient (D). The MHE‐GC method was validated to determine the emission characteristics of VOCs (Benzene, Toluene, Ethylbenzene, P‐xylene, M‐xylene, Styrene, and O‐xylene) in regenerated PET fibers. This work has studied the effects of fiber size, sample weight incubation time and incubation temperature on the detection of these VOCs. It showed finer fiber sample with less sample facilitated the emission of VOCs in fibers above detectable limit. The optimized headspace incubation time, fiber sample weight, and headspace incubation temperature were selected as 60 min, about 0.8 g and 110 °C, respectively. In addition, incubation temperature has a negative effect on the gas/fiber partition coefficient. The fibers with greater fineness showed higher activation energy, which revealed a positive release of VOCs from fibers. The relative standard deviation (RSD/%) of detection was 3%–10%. The present method is reliable and suitable for use in testing of the VOCs content in fiber‐related materials.

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“…The partition coefficients of methanol between the BCTMP's handsheet and air phase were detected at temperatures from 70 to 120 °C using a solvent-assisted headspace analysis method reported previously. 18 …”

Section: Methodsmentioning

confidence: 99%

Modeling and prediction of methanol air release from bleached chemi-thermo mechanical pulp board

et al. 2018

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This paper reports on the modeling, prediction and evaluation approaches of methanol release from bleached chemi-thermo mechanical pulp (BCTMP) board during storage. A pseudo-first order desorption kinetics model of methanol release was established for describing the desorption behavior of methanol from BCTMP, i.e., C g;t ¼ C S;0 4 þ K ½1 À expðÀk des tÞ, in which the desorption constant (K) and rate constant (k des ) were well described by van't Hoff and Arrhenius equations. Based on the simulation experiments at various temperatures, the desorption activation energy of methanol and its adsorption enthalpy is calculated and is 53.7 and À86.2 kJ mol À1 K À1, respectively. With the developed model, the risk of methanol release for the storage of BCTMP board can be examined by either the time-dependent kinetics model or a two-step thermodynamic approach using the equilibrium concentration of methanol in indoor air. This paper provides a valuable tool to assess the risk of methanol release for the paper industry and related warehouse departments.

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A novel solvent-assisted vapor absorption based headspace analysis technique for the determination of diffusion and solid–air partition coefficients of methanol in paper materials

Cited by 4 publications

References 24 publications

Print base decorative paper with high‐dimensional stability by chemical fiber modification: An experimental and analytical approach

Print base decorative paper with high‐dimensional stability by chemical fiber modification: An experimental and analytical approach

Emission characteristics of volatile organic compounds from regenerated PET fibers based on the headspace gas chromatograph

Modeling and prediction of methanol air release from bleached chemi-thermo mechanical pulp board

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