Dissolving pulp from corn stalk residue and waste water of Merox unit

Behin, Jamshid; Zeyghami, Mehdi

doi:10.1016/j.cej.2009.03.024

Cited by 44 publications

(19 citation statements)

References 25 publications

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“…Although a fairly high pulp yield and viscosity were achieved, without bleaching and intensified HWE, water PHK processed aspen wood gave the lowest cellulose purity (Al-Dajani et al 2009). Under constant alkali pulping and bleaching conditions, the xylan content in bleached pulp can be successfully reduced by significantly increasing the intensity of HWE (Behin and Zeyghami 2009;Borrega et al 2013) or by adding a small amount of mineral acid as a hydrolysis catalyst (Jahan 2008). However, the viscosities of the corresponding pulps were also slightly decreased ( partially eliminated by replacing NaOH with ethylenediamine (EDA) during the alkali pulping process (Jahan 2008), this modification will increase the operation costs.…”

Section: Cellulose Refining Through Ecf Bleachingmentioning

confidence: 99%

Comparison of hot-water extraction and steam treatment for production of high purity-grade dissolving pulp from green bamboo

et al. 2014

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The performance of hot-water extraction (HWE) and steam treatment (ST), followed by kraft pulping were compared for production of high puritygrade dissolving pulp from green bamboo. With the same prehydrolysis intensity (represented by the P-factor), the fractionation efficiency of HWE is far lower than that of ST. Because of lower removal of non-cellulosic components, the solid residue from HWE (even at approximately double the prehydrolysis intensity, P-factor = 1,379) required more active alkali (AA) during kraft pulping to obtain a cellulose purity equivalent to that achieved by the ST (Pfactor = 756)-kraft process. To reach equivalent hemicellulose removal, HWE required more severe intensity than ST. However, FTIR and SEM characterizations of solid residue confirmed that intensified HWE resulted in significant lignin condensation. Antagonistic effects of hemicellulose removal and lignin condensation extent on subsequent kraft pulping were therefore more apparent in HWE than that in ST. Under the same kraft pulping conditions, lignin condensation from a severely intensified HWE process (P-factor = 2,020) caused greater cellulose yield and viscosity loss than that found for ST. Finally, at a given residual pentosan or lignin content, the cellulose yields from all HWE-kraft pulps were about 3 % lower than those from ST-kraft pulps. Consequently, based on an optimally setup chlorine dioxide bleaching stage, a cellulosic pulp with alpha-cellulose content of 97.6 % and viscosity of 927 mL/g was successfully produced from a ST-kraft pulp (P-factor = 756, AA = 19 %).

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Section: Cellulose Refining Through Ecf Bleachingmentioning

confidence: 99%

Comparison of hot-water extraction and steam treatment for production of high purity-grade dissolving pulp from green bamboo

et al. 2014

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“…Dissolving pulp is used as a raw material in the manufacture of various cellulosederived products and textile fibers (Behin and Zeyghami 2009;Patrick 2011). The demand for dissolving pulps in the market during the last 10 years may be attributed to a consistent growth in rayon demand, particularly in China, where 61% of the current global rayon production capacity is located.…”

Section: Introductionmentioning

confidence: 99%

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Li¹,

Fu²,

Zhou³

et al. 2014

BioResources

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Despite increasing demand for dissolving pulps from raw material, production costs remain quite high compared to regular paper pulp. Research literature to date has focused on improving performance and quality but has not simultaneously explored how to improve yield, which typically falls below 35%. Dissolving pulp from bamboo, as a widely available, high-quality raw material, was investigated with dilute acetic acid pre-hydrolysis before cooking and cold caustic extraction prior to bleaching. It was found that dilute acetic acid in the pre-hydrolysis stage could speed up the degradation of hemicellulose in bamboo and improve the diffusion of the cooking liquor in bamboo fiber compared with hot-water treatment. The dissolving pulp from bamboo was produced with 93% α-cellulose, 90% ISO brightness, 959 mL/g viscosity, 5.23% xylans, and 0.17% ash. The overall yield on the basis of raw material was 37%, which was higher than other documented processes using other agents in prehydrolysis.

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“…Regarding nonwoody raw materials, e.g., corn stalk, sugarcane bagasse, rice straw, many studies have investigated pulp production by an alkaline pulping process. The results have indicated a good potential use of these kinds of raw materials (Won and Ahmed 2004;Aziz and Zhu 2006;Behin and Zeyghami 2009;Zhao et al 2011;, with pulping yield equal to or higher than the obtained yields in this study. For example, a yield of 51.8% has been reported for corn stalk processed by Soda-AQ pulping process ending at kappa number 21 .…”

Section: Kraft Pulping Of Eg and Eucamentioning

confidence: 88%

Potential of Elephant Grass for Pulp Production

et al. 2013

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Elephant grass (Pennisetum purpureum) (EG) is a fast-growing plant with high biomass productivity in the range of 30-45 bone dry t/ha/yr. This high productivity qualifies EG as a potential raw material for bleached pulp production. This study evaluated elephant grass as a raw material for paper pulp production. This was accomplished through determining its full chemical and morphological characterization, pulpability at kappa numbers 15 and 20 via the kraft and soda-AQ processes, and its pulp bleachability to 90% ISO brightness. The results were compared with those of a commercial hybrid eucalyptus wood clone (Eucalyptus urophylla x Eucalyptus grandis) (EUCA) that is widely planted in Brazil. Concerning its chemical composition, the elephant grass presented a high ash (60,100 mg/kg) and total extractives content (14.8%). However, the elephant grass showed good potential for pulp production. The kraft process was the ideal cooking process at kappa number 20, producing the highest screened yield (47.9%), bleachability (0.163 Δkappa/TAC), and good viscosity (812 dm 3 /kg). For EUCA, the ideal cooking process was the kraft process at kappa number 20, resulting in a screened yield of 52%, bleachability of 0.217 Δkappa/TAC, and final viscosity of 886 dm 3 /kg. This high productivity qualifies EG as a potential raw material for bleached pulp production.

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Dissolving pulp from corn stalk residue and waste water of Merox unit

Cited by 44 publications

References 25 publications

Comparison of hot-water extraction and steam treatment for production of high purity-grade dissolving pulp from green bamboo

Comparison of hot-water extraction and steam treatment for production of high purity-grade dissolving pulp from green bamboo

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Potential of Elephant Grass for Pulp Production

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