Tappi Journal最新文献_第7页

Paper coated with sonochemically synthesized zinc oxide nanoparticles: Enhancement of properties for preservation of documents 涂有声化学合成氧化锌纳米颗粒的纸:增强文件保存性能

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2017-01-01 DOI: 10.32964/TJ16.1.25

Suchismita Majumdar, A. Roy, I. Nandi, Prantik Banerjee, Swapna M. Banerjee, M. Ghosh, S. Chakrabarti

引用次数: 5

Accelerated aging of bio-oil from lignin conversion in subcritical water 亚临界水中木质素转化生物油的加速老化

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2017-01-01 DOI: 10.32964/TJ16.3.123

H. Lyckeskog, Cecilia Mattsson, L. Olausson, S. Andersson, Lennart Vamling, H. Theliander

{"title":"Accelerated aging of bio-oil from lignin conversion in subcritical water","authors":"H. Lyckeskog, Cecilia Mattsson, L. Olausson, S. Andersson, Lennart Vamling, H. Theliander","doi":"10.32964/TJ16.3.123","DOIUrl":"https://doi.org/10.32964/TJ16.3.123","url":null,"abstract":"Accelerated aging of bio-oil derived from lignin was investigated at different aging temperatures (50 degrees C and 80 degrees C) and times (1 hour, 1 day, 1 week, and 1 month). The bio-oil used was produced by the hydrothermal liquefaction of kraft lignin, using phenol as the capping agent, and base (potassium carbonate and potassium hydroxide) and zirconium dioxide as the catalytic system in subcritical water. Elemental composition, molecular weight (by using gel permeation chromatography), and chemical composition (by using gas chromatography-mass spectrometry and 2D nuclear magnetic resonance [18.8 T, DMSO-d(6)]) of the bio-oil were measured to gain better understanding of the changes that occurred after being subjected to an accelerated aging process. The lignin-derived hydrothermal liquefaction bio-oil was quite stable compared with biomass-pyrolysis bio-oil. The yield of the low molecular weight fraction (light oil) decreased from 64.1% to 58.1% and that of tetrahydrofuran insoluble fraction increased from 16.5% to 22.2% after aging at 80 degrees C for 1 month. Phenol and phenolic dimers (Ar-CH2-Ar) had high reactivity compared with other aromatic substituents (i.e., methoxyl and aldehyde groups); these may participate in the polymerization/condensation reactions in the hydrothermal liquefaction bio-oil during accelerated aging. Moreover, the 2D heteronuclear single quantum coherence nuclear magnetic resonance spectra of the high molecular weight fraction (heavy oil) in the aged raw oil in the aromatic region showed that the structure of this fraction was a combination of phenol-alkyl patterns, and the guaiacol cross-peaks of Ar-2, Ar-5, and Ar-6 after aging indicate that a new polymer was formed during the aging process. Application: Pulp mill personnel can use this information when considering technology to extract lignin from black liquor and process it further into bio-oil.","PeriodicalId":22255,"journal":{"name":"Tappi Journal","volume":"16 1","pages":"123-141"},"PeriodicalIF":0.6,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69473046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Impact of dissolved matter in the oxygen delignification stage 溶解物在氧脱木质素阶段的影响

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2017-01-01 DOI: 10.32964/TJ16.5.275

Carolyn M. Wilke, N. Andersson, U. Germgard

引用次数: 2

Modeling the influence of forming fabric structure on vacuum box dewatering 建立了织物结构成形对真空箱脱水的影响模型

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2017-01-01 DOI: 10.32964/TJ16.8.477

B. Sjöstrand, Christophe Barbier, L. Nilsson

引用次数: 7

Innovative technology for making improved paper from the poorest fibers 用最贫瘠的纤维制造改良纸张的创新技术

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2017-01-01 DOI: 10.32964/TJ16.11.633

M. Sterner, M. Magnusson

引用次数: 1

Combustion behavior of kraft black liquor droplets from hot water pretreated hardwood and softwood chips 热水预处理的硬木和针叶木屑中硫酸盐黑液滴的燃烧行为

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2016-12-01 DOI: 10.32964/TJ15.11.685

Cheng-Gang Chen, R. Alén, J. Lehto, H. Pakkanen

{"title":"Combustion behavior of kraft black liquor droplets from hot water pretreated hardwood and softwood chips","authors":"Cheng-Gang Chen, R. Alén, J. Lehto, H. Pakkanen","doi":"10.32964/TJ15.11.685","DOIUrl":"https://doi.org/10.32964/TJ15.11.685","url":null,"abstract":"This paper describes the combustion properties of birch and spruce kraft black liquors obtained from an integrated forest biorefinery concept in which a hot-water extraction of chips was performed prior to pulping. This pretreatment, aiming mainly at the recovery of various hemicelluloses-derived materials, increased the concentrations of lignin and hydroxy acids in black liquors, compared to those in the reference black liquors without any process modification. On the other hand, the pretreatment decreased the concentrations of volatile acids and other organics (extractives and hemicellulose residues). Due to these characteristic changes, the total burning times (pyrolysis time plus char burning time) of the reference black liquors were somewhat longer than those of black liquors from the modified cooking process. It was also shown that the novel biorefinery-based black liquors swell more than the conventional ones. This phenomenon was concluded to be primarily associated with the combined effect of high-molarmass lignin fragments and hydroxy acids. All of the detected changes in combustion behavior were more intense for birch black liquors than for spruce black liquors. Application: This study clarifies various effects caused by the typical hot-water pretreatment of hardwood and softwood chips prior to kraft pulping on the combustion properties of black liquor.","PeriodicalId":22255,"journal":{"name":"Tappi Journal","volume":"15 1","pages":"685-691"},"PeriodicalIF":0.6,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69472870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Increased dryness after pressing and wet web strength by utilizing foam application technology 利用泡沫应用技术，提高了压后干燥度和湿卷材强度

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2016-12-01 DOI: 10.32964/TJ15.11.731

K. Kinnunen-Raudaskoski, K. Salminen, J. Lehmonen, T. Hjelt

引用次数: 6

The influence of strain rate and pulp properties on the stress relaxation of wet paper — modeling of relaxation 应变速率和纸浆性质对湿纸应力松弛的影响——松弛的模拟

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2016-12-01 DOI: 10.32964/TJ15.11.693

Jarmo Kouko, J. Sorvari, E. Retulainen

引用次数: 0

Functional surfaces produced by foam coating 泡沫涂层生产的功能性表面