Alkaline Swelling of Hemp Woody Core Chips

Groot, B. de; Kolk, J.C. van der; Meer, Piet Van Der; Dam, J.E.G. van; Riet, K. van ’t

doi:10.1080/02773819708003127

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…For OBA added in the bleaching liquor, the interaction of OBA with fiber occurs under a higher temperature, longer contact time, higher consistency, and higher pH than Method B (70 • C, 3 h, 20% and pH 11 versus 23 • C, 3 min, 1% and pH 7, respectively). The higher pH will enhance the swelling of the pulp fiber; [14] a higher temperature and longer contact time and higher consistency favor the penetration and diffusion of OBA in the swelled fiber. [15] Another aspect is the difference of species.…”

Section: Oba Retentionmentioning

confidence: 99%

Interactions of Optical Brightening Agents With High Yield Pulps

Zhang

Wong

et al. 2009

Journal of Wood Chemistry and Technology

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The interactions of Optical Brightening Agents (OBA) with High Yield Pulp (HYP) fibers under two methods of OBA addition were evaluated on a softwood TMP and hardwood (aspen) HYP: OBA added to the peroxide bleach liquor (Method A), and OBA added conventionally at the wet end (Method B). The treated pulps were fractionated and OBA retention and efficiency in each fraction were determined. Adding OBA to the bleach liquor gave a higher OBA retention than adding OBA at the wet end; the hardwood HYP had a higher OBA brightening efficiency than the softwood TMP. The results are explained in terms of pulp morphology, lignin content, and process conditions (temperature and contact time). Adding OBA to the mechanical pulp also improved the brightness stability during the light-induced yellowing process.

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Section: Oba Retentionmentioning

confidence: 99%

Interactions of Optical Brightening Agents With High Yield Pulps

Zhang

Wong

et al. 2009

Journal of Wood Chemistry and Technology

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“…As illustrated in Fig. 15, the combination of oxidation and alkaline conditions induces swelling of the wood material, which contributes to easier separation during the refining (deGroot et al 1997;Chang et al 2012). Such effects can be further enhanced by treatment with carboxymethyl cellulose (Cheng et al 2013) or supplementary alkali (Xu et al 2016).…”

Section: Mechanical Pulpingmentioning

confidence: 99%

Energy efficiency challenges in pulp and paper manufacturing: A tutorial review

Hubbe

2021

BioRes

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The pulp and paper industry is highly energy-intensive. In mills that use chemical pulping, roughly half of the higher heating value of the cellulosic material used to manufacture the product typically is incinerated to generate steam and electricity that is needed to run the processes. Additional energy, much of it non-renewable, needs to be purchased. This review considers publications describing steps that pulp and paper facilities can take to operate more efficiently. Savings can be achieved, for instance, by minimizing unnecessary losses in exergy, which can be defined as the energy content relative to a standard ambient condition. Throughout the long series of unit operations comprising the conversion of wood material to sheets of paper, there are large opportunities to more closely approach a hypothetical ideal performance by following established best-practices.

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