Influence of Temperature on Kraft Pulping of Whole Bagasse and Depithed Bagasse

Pydimalla, Madhuri; Muthyala, Bhuvan Rohith; Adusumalli, Ramesh Babu

doi:10.1007/s12355-019-00719-8

Cited by 14 publications

(7 citation statements)

References 15 publications

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“…The initial increase of pulp yield at lower temperatures may be attributed to lignin inaccessibility for alkaline degradation with low diffusion rates. The reduction in pulp yield, thereafter, is due to the hydrolysis of carbohydrates of lower molecular weight which has a peeling effect on carbohydrates and inherently reduces the pulp yield (Pydimalla et al, 2019). Figures 2, 3, and 4 in summary show that sulphidity and cooking time have the most significant impact on the pulp yield whilst temperature has moderate effects.…”

Section: Pulp Yieldmentioning

confidence: 97%

“…The effect of temperature on the pulping of groundnut shells was evaluated with the objective of maximizing the rate of delignification and reducing the energy requirements. The temperature ranges for chemical pulping are usually in the range 140-180 C, but also depends on the raw material being used for pulping, considerably lower temperatures were investigated in this research, a temperature range of 84-100 C was used to reduce energy requirements (Pydimalla et al, 2019).…”

Section: Cooking Temperaturementioning

confidence: 99%

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Optimization of pulp production from groundnut shells using chemical pulping at low temperatures

Musekiwa

Moyo

Mamvura

et al. 2020

Heliyon

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Paper production through chemical pulping has been identified as one of the ideal avenues of exploring the uses of groundnut shells as they are rich in cellulose. Ideally, the cellulose can be used to synthesize fibres that can be converted into useful paper products. In this study, chemical pulping was the chosen process for liberating the fibres as it is effective in dissolving lignin embedded within the cellulose. In addition, the fibres produced have superior physical properties compared to mechanical pulping. It is imperative that optimal conditions are identified for the chemical treatment process, in order to ensure that energy and chemical consumption are minimized. All these measures are aimed at reducing production costs and make chemical pulping economically viable, as compared to the mechanical pulping process which is less costly. Response surface methodology (RSM) was used in this study to evaluate the effect of three independent variables (cooking time, temperature, and sulphidity) on pulp yield and kappa number. These parameters are critical in the chemical pulping process and the optimal conditions obtained were 180 min, 100 C and 23.6 wt.%, respectively. At the optimal cinditions, the pulp yield was 64.39wt% with a kappa number of 19.5. The results showed that all parameters investigated, had a statistically significant effect on the production of pulp. The increased cooking time was efficient in ensuring complete impregnation of the groundnut shells with chemicals for pulping and ensuring that the dissolution of lignin is not selective and does not result in dead spots inherently compromising the quality of the pulp. On the other hand, lower temperatures limited the peeling effect due to hydrolysis of carbohydrates which increased pulp yield due to a higher cellulose retention. Consequently, this contributed towards obtaining pulp that is well cooked, has a low bleach consumption and a higher quality.

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Section: Pulp Yieldmentioning

confidence: 97%

Section: Cooking Temperaturementioning

confidence: 99%

Optimization of pulp production from groundnut shells using chemical pulping at low temperatures

Musekiwa

Moyo

Mamvura

et al. 2020

Heliyon

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“…It was reported that the ash content of whole bagasse is 0.85%, which is lower than the DPB (1.17%) with 50%. This could be attributed to the completed and continuous degradation for the whole bagasse (Pydimalla et al 2019). Such lower ash content results in softness and easier possibilities in chemical recovery, where the presence of silica in agriculture residue is considered undesirable to form deposits on the internal surfaces of the evaporators during the black liquid evaporation process resulting from the fiber cooking process.…”

Section: Chemical Analysis Of Depithed Bagassementioning

confidence: 99%

“…The degradation of polysaccharides was higher than lignin dissolution at the temperature 180 °C (Ghazy 2016). Recently, the handsheets made from whole bagasse pulp produced at 165 °C were found to be stiffer with higher tensile strength index values compared to sheets from depithed bagasse pulp (Pydimalla et al 2019). The characteristic values of the pulp and black liquor of depithed bagasse processed for 1 h at 165°C have been promised and encouraged for papermaking (Pydimalla et al 2019).…”

Section: Effect Of Cooking Temperaturementioning

confidence: 99%

Ecologically friendly modified green liquor method for enhancing the technological properties of sugarcane bagasse (Saccharum officinarum L.) pulp

Fares¹,

Taha

Elgat

et al. 2020

BioRes

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Ordinary kraft pulping of bagasse was adjusted by utilizing green liquor at the laboratory and research of Misr-Edfu Pulp, Writing and Printing Paper in a small pilot batch digester (Edfu, Aswan, Egypt) as an environmentally friendly method. Bagasse pulp was produced with and without green liquor, and the physical and mechanical properties of unbleached bagasse were assessed. The parameter states of cooking were completed utilizing antacid substance charge from 10% to 13%, cooking temperature from 160 to 170 °C, cooking time from 20 to 50 min, and solid to liquor ratio of 7:1 that was steady in all preliminaries. The results demonstrated the exploratory idea that green liquor can provide critical pulping advantages in comparison with customary kraft pulping. Screened pulp yield improved 2.6%, rejects content decreased 0.9%, kappa number was reduced by 26.9%, and brightness was increased by 3%. There also was improved mechanical quality of bagasse pulp: increases of 14.3% (tensile index), 8.7% (tear index record), 4.6% (burst index), and 15.4% (double fold number) were observed compared with conventional kraft pulping. This process also saved money related to the expense of depleted vitality, lime consumed during causticizing process, and upkeep of the causticizing plant.

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“…Значительное увеличение спроса на бумагу на фоне нехватки времени для воспроизведения древесного сырья привело к применению недревесного сырья для изготовления бумаги различных сортов. В качестве источников бумажной массы предложено использовать волокна практически любых недревесных растений (однолетние растения, сельскохозяйственное сырье, быстрорастущие растения) [4][5][6][7]. Самым перспективным среди них является быстрорастущее растение рода Miscanthus Andersson: Miscanthus sacchariflorus, Miscanthus sinensis, Miscanthus purpurascens, а также Miscanthus x giganteus [8][9][10][11].…”

Section: Introductionunclassified

Hydrotropic Pulping of Miscanthus to Obtain Pulp

Севастьянова

Pavlov

Kukhlenko

et al. 2019

Journal of Siberian Federal University. Chemistry

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The hydrotropic pulping of crushed straw of Miscanthus sacchariflorus Andersson to produce pulp was studied herein. A concentrated sodium benzoate solution was used as the reagent. Established regularities of the pulping temperature and time effects on delignification quality attributes such as pulp yield and residual lignin content in the pulp. The generalized arithmetic-mean optimization parameter enabled hydrotropic pulping optimum conditions to be identified to obtain hard pulp fit. Experimentally displayed the possibility of using cellulose for the manufacture of special paper grades

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Influence of Temperature on Kraft Pulping of Whole Bagasse and Depithed Bagasse

Cited by 14 publications

References 15 publications

Optimization of pulp production from groundnut shells using chemical pulping at low temperatures

Optimization of pulp production from groundnut shells using chemical pulping at low temperatures

Ecologically friendly modified green liquor method for enhancing the technological properties of sugarcane bagasse (Saccharum officinarum L.) pulp

Hydrotropic Pulping of Miscanthus to Obtain Pulp

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