Model studies on reactions occurring in oxidations of lignin with molecular oxygen in Alkaline Media

Kratzl, K.; Claus, P.; Lonsky, Werner F. W.; Gratzl, Josef S.

doi:10.1007/bf00350641

Cited by 18 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Beyond the milestone 50% oxygen delignification, kraft pulp incurs a significant loss in pulp viscosity and strength properties. , A number of approaches that focus on manipulating the chemistry of an oxygen delignification stage have been explored, including the double-oxygen delignification stage. , Yet, double stages have yet to reach idealized limits; in fact, Chirat and Lachenal demonstrated in an elegant study of multistage oxygen delignification that a significant fraction of the residual lignin remains even after four stages , It was found that moieties bearing free (noncondensed) phenolic groups exhibited a higher reactivity than their etherified counterparts. − On the basis of the accumulated information, Gierer proposed a reaction in which the phenolate residues are oxidized to phenoxy radicals and the oxygen-based radicals convert lignin to organic hydroperoxides and muconic acids . The latter structures have been observed in structural studies associated with lignin isolation using an acidolytic method developed by Gellerstedt and popularized in fundamental chemistry research circles .…”

Section: Introductionmentioning

confidence: 99%

“…6 Early efforts used model reactions to explore the basis of the inactivity of residual lignin in oxygen delignification. 7,8 It was found that moieties bearing free (noncondensed) phenolic groups exhibited a higher reactivity than their etherified counterparts. [9][10][11] On the basis of the accumulated information, Gierer proposed a reaction in which the phenolate residues are oxidized to phenoxy radicals and the oxygen-based radicals convert lignin to organic hydroperoxides and muconic acids.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Evaluation of Oxygen Delignification Processes for Low- and High-Lignin-Content Softwood Kraft Pulps

Lucia

Ragauskas

Chakar

2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Institute of Paper Science and Technology 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 51 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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Oxygen Delignification Processes for Low- and High-Lignin-Content Softwood Kraft Pulps

Lucia

Ragauskas

Chakar

2002

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

Pulp Bleaching: Sections 7.5.5–7.10.5

Sixta¹

2006

Handbook of Pulp

View full text Add to dashboard Cite

Sulfur‐free lignins as composites of polypropylene films

Košíková

Demianová

Kačuráková

1993

J of Applied Polymer Sci

View full text Add to dashboard Cite

SYNOPSISTo elucidate the effect of lignin addition, polypropylene films containing 2-10 w t % of spruce organosolv lignin and/or beech wood prehydrolysis lignin were compared with lignin-free polymers with respect to tensile strength and elongation before and after aging. The physicochemical properties of the lignin-containing films were investigated by conductivity measurements, surface behavior, and UV and IR spectroscopy. 0

show abstract

Model studies on reactions occurring in oxidations of lignin with molecular oxygen in Alkaline Media

Cited by 18 publications

References 22 publications

Comparative Evaluation of Oxygen Delignification Processes for Low- and High-Lignin-Content Softwood Kraft Pulps

Comparative Evaluation of Oxygen Delignification Processes for Low- and High-Lignin-Content Softwood Kraft Pulps

Pulp Bleaching: Sections 7.5.5–7.10.5

Sulfur‐free lignins as composites of polypropylene films

Contact Info

Product

Resources

About