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Biological modification of loblolly ...

villalba, Laura L.

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Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping./
作者:	villalba, Laura L.
面頁冊數:	171 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5166.
Contained By:	Dissertation Abstracts International64-10B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3109949
ISBN:	0496574896

Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping.
villalba, Laura L.

Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping. - 171 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5166.

Thesis (Ph.D.)--State University of New York College of Environmental Science and Forestry, 2003.

The ability of the white-rot fungus Ceriporiopsis subvermispora to selectively degrade lignin in loblolly pine chips and the effect on kraft pulps was investigated.

ISBN: 0496574896Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping.
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245 1 0 $a Biological modification of loblolly pine chips with Ceriporiopsis subvermispora prior to kraft pulping.
300 $a 171 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 5166.
500 $a Co-Major Professors: Leland R. Schroeder; Gary M. Scott.
502 $a Thesis (Ph.D.)--State University of New York College of Environmental Science and Forestry, 2003.
520 $a The ability of the white-rot fungus Ceriporiopsis subvermispora to selectively degrade lignin in loblolly pine chips and the effect on kraft pulps was investigated.
520 $a The effect of fungal treatment was assessed by comparing changes in untreated wood chips with chips incubated for two and four weeks. The kraft pulping step included two different cooking times and two levels of chemical dosage as the variables, 16 and 22% for the effective alkali and 60 and 90 min at 170°C. The other cooking variables were kept constant for all the experiments and were: sulfidity, 22%; liquor/wood ratio 4:1; time to Tmax 90 min.; Tmax 170°C.
520 $a Scanning electron microscopy (SEM) revealed that the colonization introduced significant chemical and physical changes. Pore size distribution analyses revealed a statistically significant increase in the average pore size as fungal treatment progressed.
520 $a Significant reduction in the extractives content (23%) was found in the first 2 weeks, after which the reduction leveled off. Lignin losses reached 2% in the first 2 weeks of incubation, followed by an 11% loss after 4 weeks of treatment. Lignin phenolic hydroxyl groups increased 14% after 4 weeks of incubation. Fungal treatment caused 4 and 6% carbohydrate loss in 2 and 4 weeks-treated chips, respectively.
520 $a The selectivity of the fungal treatment was emphasized in the subsequent kraft pulping. The best response regarding improved delignification was found in kraft pulps processed at the mildest pulping conditions without affecting pulp viscosity.
520 $a Benefits of fungal treatment regarding freeness of kraft pulps were evidenced after 4 weeks of incubation with a maximum of 35% freeness reduction in kraft pulps refined at 12,000 rev in a PFI mill. Strength properties of kraft pulps of fungal treated chips were superior to those of the control.
520 $a This method involves chemical and physical modification of wood chips using fungi. The approach improved chip impregnation, which in turn, led to more uniform kraft pulping. Transformation of raw material is one of the means of improving the production of chemical pulps.
590 $a School code: 0213.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Agriculture, Wood Technology. $3 1031154
690 $a 0794
690 $a 0746
710 2 0 $a State University of New York College of Environmental Science and Forestry. $3 1017822
773 0 $t Dissertation Abstracts International $g 64-10B.
790 1 0 $a Schroeder, Leland R., $e advisor
790 1 0 $a Scott, Gary M., $e advisor
790 $a 0213
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3109949