Effect of Pulping Conditions on the ECF Bleachability of <i>Eucalyptus globulus</i> Kraft Pulps

Neto, Carlos Pascoal; Evtuguin, Dmitry; Furtado, F. P.; Sousa, António P. Mendes de

doi:10.1021/ie020263x

Cited by 16 publications

(3 citation statements)

References 4 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pascoal, et al stated that variations in time during cooking with a constant temperature affected the value of the kappa number. This was because a longer cooking time caused a reduction in the value of the kappa number and vice versa [11]. The cooking time was also directly proportional to H-Factor.…”

Section: Effect Of H-factor On Kappa Number and Viscositymentioning

confidence: 99%

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

Putri,

Rahmatullah,

Siagian

2023

CHEESA

View full text Add to dashboard Cite

<p class="StyleE-JournalKeywordsNotItalic">One of the most important steps in pulping is the cooking process, which serves to separate the cellulose and hemicellulose from lignin and other by-products. During the cooking process in the digester, various factors must be considered to create high-quality pulp. Among these factors, the H-Factor plays a significant role due to its impact on the kappa number and viscosity in the pulping process. A high H-Factor can also damage the strength of the pulp. Therefore, this research aims to investigate the effect of the H-Factor and active alkali on pulp yield and quality. The active alkali used was in line with the desired production objectives, as insufficient levels of active alkali can lead to a low yield of pulp. Meanwhile, pulp quality standards in the Pulp and Paper Industry included kappa number of 12-18 in the digester process, an approximate viscosity of 23 mPa.s, and the selection of H-Factor based on the desired production target.</p>

show abstract

Section: Effect Of H-factor On Kappa Number and Viscositymentioning

confidence: 99%

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

Putri,

Rahmatullah,

Siagian

2023

CHEESA

View full text Add to dashboard Cite

show abstract

“…According to Gellerstedt [16], prolonged heating considerably reduces the rate of lignin breakdown. This might be the case because lignin removal becomes more challenging as concentration increases since it alters the pulp reaction to bleaching [17].…”

Section: Chemical Constituent's Determinationmentioning

confidence: 99%

Effect of Bleaching with Potassium Hydroxide on the Properties of Egg Carton Pulp for Nitrocellulose Production

Andok,

Lee,

Gilbert Jesuet

et al. 2023

BIO Web Conf.

View full text Add to dashboard Cite

Nitrocellulose known as gun cotton and the main component of smokeless gun powder. The primary cellulose sources for nitrocellulose manufacturing are refined cotton linters and wood pulp. This research aims to look into the possibilities of egg carton pulp (ECP) as a resource in the manufacturing of nitrocellulose. The effect of different concentrations of KOH (0.6 M, 1.0 M, and 1.5 M) on ECP properties was evaluated. The ECP was characterized by chemical composition, Fourier transform infrared (FTIR), and thermogravimetric analyses (TGA). This study showed that bleaching using 1.0 M KOH reduced the lignin content by up to 1.01% and enhanced cellulose content by up to 86.94%. The presence of a 1420 cm-1 band in FT-IR spectra after the bleaching process reveals the existence of cellulose in the ECP. Based on the onset temperature degradation, the highest temperature measured was 294 ℃ for 1.0 M bleached ECP, corresponding to the cellulose degradation temperature. The presence of a high proportion of cellulose in the ECP after bleaching with 1.0 M of KOH indicates that the ECP has the potential to be used as a source of raw material in nitrocellulose production.

show abstract

“…Gellerstedt [23] claims that the rate of lignin dissolution slows significantly with prolonged cooking. This could be because the extent of concentration affects the bleaching response of the pulp, making it increasingly difficult to remove the lignin [24].…”

Section: Chemical Constituents Of Bleached Egg Carton Pulpmentioning

confidence: 99%

Utilization of Recycled Egg Carton Pulp for Nitrocellulose as an Accelerant in Briquette Production

et al. 2023

View full text Add to dashboard Cite

Nitrocellulose (NC) is a conservative material that is used in a variety of applications, such as coating agents, biodegradable plastics, and propellant main charge. Nitrocellulose raw materials are easily obtained from lignocellulose sources, most notably cotton and wood pulp. The egg carton, a recycled paper waste designed for packaging and transporting eggs, is used in this study to make nitrocellulose in pulp form. The effects of different nitration durations (40, 50, and 60 min) from egg carton pulp bleached with various KOH concentrations (0.6 M, 1.0 M, and 1.5 M) on NC properties were evaluated. The accelerant properties of the NC of nitration time in 50 min were studied in a rice husk charcoal briquette. Rice husk charcoal briquettes are made in various ratios with nitrocellulose as an accelerant (97:3, 96:4, and 95:5). The NC was characterized using Fourier transform infrared (IR) spectroscopy and thermogravimetric (TG) analysis. 1.0 M of bleached egg carton pulp has the highest cellulose content (86.94%) with the presence of crystalline structure of cellulose at peak 1430 cm−1 after the bleaching process. Meanwhile, different nitration times revealed that 50 min had the highest nitrogen content (7.97%) with a 1.23 degree of substitution (DS) value. Based on its TG analysis, NC 50 has met the requirements for use as an accelerant for briquettes, with an onset temperature of 91.60 °C and a weight loss of 62.60%. Infrared at peak 1640 cm−1 confirmed the presence of NO2 groups in nitrocellulose successfully formed by nitration. After the addition of nitrocellulose, the calorific value of the briquette increased from 13.54% to 15.47%. Fixed carbon and volatile matter showed the same pattern. The combustion of nitrocellulose-briquette has also been demonstrated by Td10% of degradation, which degraded between 310 and 345 °C.

show abstract

Effect of Pulping Conditions on the ECF Bleachability of Eucalyptus globulus Kraft Pulps

Cited by 16 publications

References 4 publications

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

The Effect of H-Factor on Kappa Number and Viscosity in Continuous Digester

Effect of Bleaching with Potassium Hydroxide on the Properties of Egg Carton Pulp for Nitrocellulose Production

Utilization of Recycled Egg Carton Pulp for Nitrocellulose as an Accelerant in Briquette Production

Contact Info

Product

Resources

About