Abstract
Prehydrolysis kraft (PHK) pulps account for more than half of the global market of dissolving pulp. Characterized by high reactivity toward dissolution, their performances can still be improved by activation treatments. This study compares the dissolution kinetics in cupriethylenediamine of a hardwood and a softwood PHK pulps before and after their activation by high-solid-content mechano-enzymatic treatments. Three enzyme combinations were tested: endoglucanase (E), xylanase and mannanase (XM), and endoglucanase, xylanase, and mannanase (EXM). Xylanase and mannanase reduced the hemicellulose content of only hardwood (by max. 2.4%). Mixing and carbohydrate depolymerization decreased the dissolution time of hardwood and softwood pulps by a maximum of 63 and 30% with E, 37 and 16% with XM, and 44 and 30% with EXM, respectively. The shortening of the dissolution time was partially hindered by hornification, which increased with hemicellulose degradation. Interestingly, XM accelerated the dissolution while preserving a high weight-average molecular mass.
Highlights
IntroductionIt is used to produce cellulose derivative products, such as textile fibers, acetate filaments and films, binders, detergents, food and pharmaceutical additives, explosives, and specialty papers.[3,4] Different final products require different pulp chemistries and processes, such as xanthation and regeneration in the case of viscose fibers or acetylation in the case of acetate filaments or films.[1,4] the reactivity of dissolving pulp is evaluated in the context of its final application
Dissolving pulp is characterized by high cellulose purity (>92%), high brightness, low macromolecular polydispersity, low ash and metal ion content, and remarkable reactivity.[1,2]Principally, it is used to produce cellulose derivative products, such as textile fibers, acetate filaments and films, binders, detergents, food and pharmaceutical additives, explosives, and specialty papers.[3,4] Different final products require different pulp chemistries and processes, such as xanthation and regeneration in the case of viscose fibers or acetylation in the case of acetate filaments or films.[1,4] the reactivity of dissolving pulp is evaluated in the context of its final application
In 2003, the global market of dissolving pulp consisted of 60− 63% acid sulfite (AS) pulp, 22−25% prehydrolysis kraft (PHK) pulp, and 12−16% cotton linter pulp,[1] while at present, it is composed of ca. 56% PHK pulp and 42% AS pulp.[2]
Summary
It is used to produce cellulose derivative products, such as textile fibers, acetate filaments and films, binders, detergents, food and pharmaceutical additives, explosives, and specialty papers.[3,4] Different final products require different pulp chemistries and processes, such as xanthation and regeneration in the case of viscose fibers or acetylation in the case of acetate filaments or films.[1,4] the reactivity of dissolving pulp is evaluated in the context of its final application. Due to the increasing demand for cellulose derivative products, the global production of dissolving pulp has increased from 5.6 MMT in 2013 to a nominal capacity of 10.5 MMT in 2020.4,5 This market consists mainly of acid sulfite (AS) and prehydrolysis kraft (PHK) dissolving pulp. In 2003, the global market of dissolving pulp consisted of 60− 63% acid sulfite (AS) pulp, 22−25% prehydrolysis kraft (PHK) pulp, and 12−16% cotton linter pulp,[1] while at present, it is composed of ca. 56% PHK pulp and 42% AS pulp.[2]
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