Kinetics of Oxygen Delignification of High-Kappa Pulp in a Continuous Flow-Through Reactor

Jafari, Vahid; Sixta, Herbert; Heiningen, Adriaan van

doi:10.1021/ie403336x

Cited by 19 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 In oxygen delignification of pine kraft pulp, the use of a continuous reactor resulted in a significantly higher performance compared with a batch reactor. 14 In a research study evaluating lignocellulose biotreatment, a faster and shorter initial delignification phase was reported in the fungitreated wood. 15 An organosolv pulping using formic acid resulted in a highly effective lignin removal with a minor dissolution of other components from bamboo.…”

Section: Introductionmentioning

confidence: 99%

Delignification of intact biomass and cellulosic coproduct of acid‐catalyzed hydrolysis

2015

View full text Add to dashboard Cite

The kinetics of acid-catalyzed hemicellulose removal and also alkaline delignification of oat hull biomass were investigated. All three operational parameters namely, catalyst concentration (0.10-0.55 N H 2 SO 4 ), temperature (110-130 C), and residence time (up to 150 min) affected the efficiency of hemicellulose removal, with 100% of hemicellulose removed by appropriate selection of process parameters. Analysis of delignification kinetics (in the temperature range of 30-100 C) indicated that it can be expressed very well by a two-phase model for the crude biomass and also for the hemicellulose-prehydrolyzed material. The application of acid-catalyzed prehydrolysis improved the capacity of lignin dissolution especially at lower temperatures (30 and 65 C) and accelerated the dissolution of lignin. This acceleration of delignification by prehydrolysis was possible at all levels of temperature in the bulk phase; however, results were more significant at the lower temperatures in the terminal phase.

show abstract

Section: Introductionmentioning

confidence: 99%

Delignification of intact biomass and cellulosic coproduct of acid‐catalyzed hydrolysis

2015

View full text Add to dashboard Cite

show abstract

“…The initial KaNo value influences the level of delignification in the same NaOH charge. The KaNo target for the cooking process are 25 to 30, and further delignification using the alkaline oxygen process recommends a KaNo of 15−20 (Jafari et al, 2014a).…”

Section: Table 1 Typical Conditions In Industrial Medium Consistency Oxygen Delignificationmentioning

confidence: 99%

“…Carbohydrate degradation occurs in particular during the initial stage and continues toward the end of kraft cooking. The oxygen-alkali process (i.e., oxygen delignification) is known to be more selective (i.e., carbohydrate yield/delignification) than the final kraft cooking phase (Jafari et al, 2014a;Jafari et al, 2014b). The equipment used for medium consistency oxygen delignification consists of a steam medium pressure injection system, centrifugal pump, pressurized reactor, distribution reactor, and gas mixer with high turbulence (Hart and Rudie, 2012).…”

Section: Introductionmentioning

confidence: 99%

Improving Reaction Selectivity with NaOH Charges and Reaction Time in the Medium Consistency Oxygen Delignification Process

Irawan

Darmawan

Roesyadi

et al. 2020

IJTech

View full text Add to dashboard Cite

As more delignification is targeted, fiber degradation becomes a main issue in the pulping process. Sodium hydroxide (NaOH) is highly related to pulp quality in the medium consistency oxygen delignification process. Accordingly, the purpose of this research was to study the effect of NaOH charges and reaction time on reaction selectivity during the pulping process through medium consistency oxygen delignification. This research used Eucalyptus pelita and Acacia mangium pulp with a kappa number (KaNo) of 17-18. The medium consistency oxygen delignification process condition included a temperature of 80°C and oxygen pressure of 1 bar, while the reaction times were 20, 40, 60, 80, and 100 min. The NaOH charges were 5, 10, 15, 20, and 25 kg/t of pulp. The analysis parameters used were KaNo and viscosity. The variation in reaction time did not show a significant change in KaNo. The increase in reaction time and NaOH charge variations, meanwhile, can reduce pulp viscosity. Higher NaOH values significantly increased the delignification degree, and the higher NaOH charges and reaction times together lowered the degree of polymerization (DP). The variation in reaction time indicated that with a longer reaction time, the lower the DP, and with a higher NaOH charge and longer reaction time, the lower the reaction selectivity.

show abstract

“…Continuous Batch Cooking (CBC) is an improved batch cooking technology [17,18]. The main characteristic of the CBC is that the chemical concentration is relatively stable by continuously supplying the fresh cooking chemicals in the cooking.…”

Section: Introductionmentioning

confidence: 99%

Continuous Chemical Supplement, a Novel Solution to Improve the Efficiency of Peroxide Bleaching

Sun¹,

Shi²,

Ji³

et al. 2018

Proceedings of the 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017)

View full text Add to dashboard Cite

Abstract:In conventional peroxide bleaching of chemi-thermomechanical pulp (CTMP), the bleaching efficiency of hydrogen peroxide (H2O2) is far lower than its expected level. In this paper, a novel bleaching method is proposed to improve the H2O2 bleaching efficiency of poplar CTMP.This novel method, namely Continuous Chemical Supplement (CCS), maintained constant concentrations of H2O2 and total alkali in the bleaching system for a long time by supplementing continuously H2O2 and NaOH solutions using peristaltic pumps. The H2O2 decomposition was reduced and the brightness was improved. Consequently, the bleaching efficiency was improved.The experimental results indicated that the bleaching efficiency reached 16.5 by CCS, which was significantly higher than that obtained by the traditional high-consistency bleaching method (7.4).This novel bleaching method may be helpful to industrial production practice.

show abstract

Kinetics of Oxygen Delignification of High-Kappa Pulp in a Continuous Flow-Through Reactor

Cited by 19 publications

References 18 publications

Delignification of intact biomass and cellulosic coproduct of acid‐catalyzed hydrolysis

Delignification of intact biomass and cellulosic coproduct of acid‐catalyzed hydrolysis

Improving Reaction Selectivity with NaOH Charges and Reaction Time in the Medium Consistency Oxygen Delignification Process

Continuous Chemical Supplement, a Novel Solution to Improve the Efficiency of Peroxide Bleaching

Contact Info

Product

Resources

About