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Pulpwood Quality of the Second Generation Acacia auriculiformis

Journal of Bioresources and Bioproducts 2019年第2期4卷 73-79页

作者： MdMoinul HAQUE M Nashir UDDIN M A QUAIYYUM Jannatun NAYEEM M Zahangir ALAM M Sarwar JAHAN Pulp and Paper Research Division Bangladesh Council of Scientific&Industrial Research LaboratoriesDhaka 1205Bangladesh Department of Applied Chemistry and Chemical Engineering University of DhakaDhaka 1205Bangladesh

The physical,chemical and fibre characteristics of the 6,8 and 10 years old akashmoni(Acacia auriculiformis)wood from the second generation seed and their suitability for pulping were assessed and compared with the wood of 10 years old from the first generation *** *** of 8 years old had the highestα-cellulose and lower lignin than those of 6 and 10 years old,which are similar to the first generation *** study also evaluated the effect of cooking time,temperature and active alkali on kraft *** most important influence factors for pulp yield and kappa number were active alkali charge and *** highest screened rejects were observed for young *** degree of the 1st generation was faster than that of the 2nd generation ***.

关键词： second generation Acacia auriculiformis α-cellulose wood density pulping active alkali and cooking time

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Variation of chemical characteristics and pulpability of dhaincha(Sesbania bispinosa)on location

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Journal of Bioresources and Bioproducts 2017年第1期2卷 24-29页

作者： Mamon Sarkar Shrikanta Sutradhar AKM Golam Sarwar M.Nashir Uddin Sontosh C.Chanda M.Sarwar Jahan Pulp and Paper Research Division BCSIR LaboratoriesDhakaDr.Qudrat-i-Khuda RoadDhaka 1205Bangladesh Laboratory of Plant Systematics Department of Crop BotanyBangladesh Agricultural UniversityMymensingh 2202Bangladesh

Dhaincha(Sesbania bispinosa(Jacq.)Wight)is a crop generally cultivated for improving soil *** to the lack of forest worldwide,alternative source of raw materials for cellulose industries is the main concern *** this investigation,dhaincha samples of 21 accessions were collected from different districts of Bangladesh in order to study the variation of chemical characteristics and its *** lignin,pentosan andα-cellulose content were varied from 21 to 23%,16 to 18%and 38 to 43%,*** highest and lowestα-cellulose contents were found in two location of Mymensingh *** was no correlation was found among the ***,pulping of dhaincha from selected seven districts was carried out in kraft process at the conditions of 18%active alkali at 170℃ for 2 *** the pulping properties did not show any mentionable distinction for place *** pulp yield is 42.9%with kappa number *** highest brightness 85%was reached with D_(0)E_(p)D_(1)*** papermaking properties were very close to the conventional raw materials used in ***,dhaincha can be used as a raw material for pulp production in Bangladesh.

关键词： Dhaincha Accession number α-cellulose Lignin Pentosan Pulp yield Brightness

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Upgrading Paper-grade Softwood Kraft Pulp to Dissolving Pulp by Cold Caustic Extraction

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Paper And Biomaterials 2016年第1期1卷 31-37页

作者： Chao Tian QingXian Miao LinQiang Zheng YongHao Ni China National Pulp and Paper Research Institute Beijing 100102 China Limerick Pulp and Paper Centre Department of Chemical Engineering University of New Brunswick Fredericton NB E3B 5A3 Canada Tianjin Key Laboratory of Pulp and Paper Tianjin University of Science and Technology Tianjin 300457 China College of Material Engineering Fujian Agriculture and Forestry University Fuzhou Fujian Province 350002 China

Cold caustic extraction has potential applications in the production of dissolving-grade pulps due to its ability to selectively remove hemicellulose from lignocellulosic materials. In this study,we demonstrate the conversion of paper-grade kraft pulp into dissolving pulp by a single-stage cold caustic extraction. Under the extraction conditions of 12 wt% NaOH lye,11% pulp consistency,a temperature of 35℃,and 2 h,a paper-grade softwood kraft pulp was purified to high-grade dissolving pulp with 97. 1% α-cellulose content,1. 2% pentosane content,and narrowed molecular weight distribution. The resulting extraction filtrate was concentrated by nano-filtration to obtain the hemicellulose content of 59. 0 g / L,while the permeate was a clear Na OH solution with 10. 9 wt% concentration. A process configuration was also proposed,integrating this cold caustic extraction process with existing pulp and paper production and multi-purpose utilization of the extraction filtrate.

关键词： cold caustic extraction dissolving pulp α-cellulose membrane filtration hemicellulose

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