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The significance of aryl-ether cleav...

Ko, Chun-Han.

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The significance of aryl-ether cleavages in the alkaline delignification process.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The significance of aryl-ether cleavages in the alkaline delignification process./
Author:	Ko, Chun-Han.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 1993,
Description:	154 p.
Notes:	Source: Masters Abstracts International, Volume: 32-05, page: 1327.
Contained By:	Masters Abstracts International32-05.
Subject:	Wood sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1356677

The significance of aryl-ether cleavages in the alkaline delignification process.
Ko, Chun-Han.

The significance of aryl-ether cleavages in the alkaline delignification process. - Ann Arbor : ProQuest Dissertations & Theses, 1993 - 154 p.

Source: Masters Abstracts International, Volume: 32-05, page: 1327.

Thesis (M.S.)--State University of New York College of Environmental Science and Forestry, 1993.

This study evaluates the significance of aryl ether cleavages in the alkaline delignification of Norway spruce and aspen for both kraft and soda processes. The aryl ether-cleavage reaction was monitored by phenolic hydroxyl group generation in the pulp residual lignin as estimated by periodate oxidation method.Subjects--Topical Terms:

3168288
Wood sciences.

The significance of aryl-ether cleavages in the alkaline delignification process.
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100 1 $a Ko, Chun-Han. $3 1257783
245 1 4 $a The significance of aryl-ether cleavages in the alkaline delignification process.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1993
300 $a 154 p.
500 $a Source: Masters Abstracts International, Volume: 32-05, page: 1327.
502 $a Thesis (M.S.)--State University of New York College of Environmental Science and Forestry, 1993.
520 $a This study evaluates the significance of aryl ether cleavages in the alkaline delignification of Norway spruce and aspen for both kraft and soda processes. The aryl ether-cleavage reaction was monitored by phenolic hydroxyl group generation in the pulp residual lignin as estimated by periodate oxidation method.
520 $a In soda cooking, the extent of delignification up to about 90% level was closely related to aryl-ether hydrolysis reactions. Further delignification was relatively unaffected by the ether cleavage reaction. A similar trend was observed for aspen except displaying a distinct initial phase up to about 30% delignification. This initial delignification seems to be associated with the hydrolysis of few aryl ether units.
520 $a The impact of aryl ether hydrolysis on alkaline delignification is equally comparable for both soda and kraft cooks and this was not considerably affected by pulping temperatures (160-180$\sp\circ$C), sulfidity, alkali concentration (0.5-1.5M) and AQ addition.
520 $a Interestingly, a nearly linear "isokinetic" (enthalphy-entrophyl) relationship was observed for both the aryl ether-hydrolysis and delignification reactions. The kinetic data further support the significance of aryl-ather cleavages in the alkaline delignification process.
590 $a School code: 0213.
650 4 $a Wood sciences. $3 3168288
650 4 $a Chemical engineering. $3 560457
650 4 $a Polymer chemistry. $3 3173488
690 $a 0746
690 $a 0542
690 $a 0495
710 2 $a State University of New York College of Environmental Science and Forestry. $3 1017822
773 0 $t Masters Abstracts International $g 32-05.
790 $a 0213
791 $a M.S.
792 $a 1993
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1356677