Competing Reactions Affecting Delignification in Pulping Systems

Brogdon, Brian N.; Dimmel, Donald R.

doi:10.1080/02773819608545823

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…The investigated hardwood pulps required removal of lignin at Kappa numbers below 35-40 in order to achieve the highest yield of glucose production. It is widely known that hardwood is easier to digest than softwood [28,29], therefore, due to the lower content of lignin in the pulp, it should be easier to undergo enzymatic hydrolysis [30,31]. However, it should be mentioned that deciduous wood is more anatomically complex, therefore, also a greater variation in the lignin distribution in the wood can occur [6,32].…”

Section: Enzymatic Hydrolysis Of Birch and Beech Pulpsmentioning

confidence: 99%

The Effect of Lignin Content in Birch and Beech Kraft Cellulosic Pulps on Simple Sugar Yields from the Enzymatic Hydrolysis of Cellulose

Buzała¹,

Kalinowska

Małachowska

et al. 2019

Energies

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The results of enzymatic hydrolysis of birch and beech kraft cellulosic pulps indicate that they may be promising feedstocks for fermentation processes including biofuel manufacturing. The aim of this study was to investigate whether birch and beech wood require the same degree of delignification by kraft pulping as pine wood. The differences observed in the efficiency of hydrolysis for the raw materials tested suggest that the differences in the anatomical structure of the examined wood in relation to pine wood is essential for the efficiency of the enzymatic hydrolysis process. The yields of glucose and other reducing sugars obtained from the birch and beech cellulosic pulps were similar (up to around 75% and 98.3% dry weight, and 76% and 98.6% dry weight, respectively). The highest glucose yields from cellulose contained in the birch and beech pulp were around 81.2% (at a Kappa number of 28.3) and 83.1% (at a Kappa number of 30.4), respectively. The maximum glucose yields and total reducing sugars of birch wood on a dry weight basis (39.8% and 52.1%, respectively) were derived from the pulp at a Kappa number of 28.3, while the highest yields of glucose and total reducing sugars of beech wood on a dry weight basis (around 36.9% and 48.2%, respectively) were reached from the pulp at a Kappa number of 25.3. To obtain the highest glucose yields and total reducing sugars of a wood on a dry weight basis, total lignin elimination from the birch and beech pulps was not necessary. However more in-depth delignification of birch and beech wood is required than for pine wood.

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Section: Enzymatic Hydrolysis Of Birch and Beech Pulpsmentioning

confidence: 99%

The Effect of Lignin Content in Birch and Beech Kraft Cellulosic Pulps on Simple Sugar Yields from the Enzymatic Hydrolysis of Cellulose

Buzała¹,

Kalinowska

Małachowska

et al. 2019

Energies

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“…The rate of delignification in acid-catalyzed organosolv pulping processes is governed by the hydrolysis of α-ether links in lignin [98][99][100][101][102]. The process also involves other complex reactions such as condensation, partial hydrolysis of β-aryl links, release of formaldehyde and recombination of free radicals [40,[78][79][80][81].…”

Section: Delignification Mechanismsmentioning

confidence: 99%

Different Solvents for Organosolv Pulping

Rodríguez¹,

Espinosa²,

Domínguez-Robles³

et al. 2018

Pulp and Paper Processing

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Organosolv pulping is a two-stage process involving hydrolysis (decomposition of wood by use of a catalyst) and removal of lignin with an organic solvent (usually a mixture of alcohol and water). The main disadvantage of using an alcohol is its low boiling point, which requires operating at a high pressure and hence using special equipment that is expensive to purchase and operate. One solution to this problem is using alternative organic solvents that afford operation at pressure levels similar to those of classic pulping processes (e.g., the Kraft process). This chapter provides a comprehensive literature review on the organosolv-based production of cellulose pulp by using alternative solvents such as glycols, phenols, esters, organic acids, acetone and amines.

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A Study Aimed at Understanding the AQ/Polysulfide Synergistic Effect in Alkaline Pulping

Anderson¹,

Dimmel²,

Izsak³

2003

Journal of Wood Chemistry and Technology

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is an independent graduate school, research organization, and information center for science and technology mainly concerned with manufacture and uses of pulp, paper, paperboard, and other forest products and byproducts. Established in 1929 as the Institute of Paper Chemistry, the Institute provides research and information services to the wood, fiber, and allied industries in a unique partnership between education and business. The Institute is supported by more than 40 member companies. The purpose of the Institute is fulfilled through four missions, which are: • to provide a multidisciplinary graduate education to students who advance the science and technology of the industry and who rise into leadership positions within the industry; • to conduct and foster research that creates knowledge to satisfy the technological needs of the industry; • to provide the information, expertise, and interactive learning that enable customers to improve job knowledge and business performance; • to aggressively seek out technological opportunities and facilitate the transfer and implementation of those technologies in collaboration with industry partners. ACCREDITATION The Institute of Paper Science and Technology is accredited by the Commission on Colleges of the Southern Association of Colleges and Schools to award the Master of Science and Doctor of Philosophy degrees. NOTICE AND DISCLAIMERThe Institute of Paper Science and Technology (IPST) has provided a high standard of professional service and has put forth its best efforts within the time and funds available for this project. The information and conclusions are advisory and are intended only for internal use by any company who may receive this report. Each company must decide for itself the best approach to solving any problems it may have and how, or whether, this reported information should be considered in its approach.IPST does not recommend particular products, procedures, materials, or service. These are included only in the interest of completeness within a laboratory context and budgetary constraint. Actual products, materials, and services used may differ and are peculiar to the operations of each company.In no event shall IPST or its employees and agents have any obligation or liability for damages including, but not limited to, consequential damages arising out of or in connection with any company's use of or inability to use the reported information. IPST provides no warranty or guaranty of results.The Institute of Paper Science and Technology assures equal opportunity to all qualified persons without regard to race, color, religion, sex, national origin, age, disability, marital status, or Vietnam era veterans status in the admission to, participation in, treatment of, or employment in the programs and activities which the Institute operates.

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Competing Reactions Affecting Delignification in Pulping Systems

Cited by 4 publications

References 15 publications

The Effect of Lignin Content in Birch and Beech Kraft Cellulosic Pulps on Simple Sugar Yields from the Enzymatic Hydrolysis of Cellulose

The Effect of Lignin Content in Birch and Beech Kraft Cellulosic Pulps on Simple Sugar Yields from the Enzymatic Hydrolysis of Cellulose

Different Solvents for Organosolv Pulping

A Study Aimed at Understanding the AQ/Polysulfide Synergistic Effect in Alkaline Pulping

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