Optimizing alkaline extraction for eucalyptus kraft pulp bleaching

Lewis D. Shackford; Carlos A. Santos; Jorge L. Colodette; Ericka F. Alves

doi:10.32964/tj8.1.12

Optimizing alkaline extraction for eucalyptus kraft pulp bleaching

Lewis D. Shackford
, Carlos A. Santos
, Jorge L. Colodette
, Ericka F. Alves

Chemical Engineering

College of Environmental Science & Forestry

GL and V USA Inc.
GL and V Brasil Ltda.
Universidade Federal de Viçosa

Research output: Contribution to specialist publication › Article

10 Scopus citations

Abstract

This paper evaluates different approaches for the (E*) stage of the D_HT(E*)D sequence for eucalyptus kraft pulp bleaching to 90%-91% ISO brightness, considering kappa factors 0.12, 0.16, and 0.20 in the first stage. These (E*) approaches included E, (EO), (EP), (EOP), (PO), P_HT, O, and (O/O) stages run at two temperatures. Results were compared on the basis of total active chlorine demand, chemical cost, pulp brightness stability and viscosity, and effluent load. We concluded that a DHT kappa factor of 0.12 and a (PO) stage run at 85°C-95°C appeared to be the most attractive approach for bleaching eucalyptus pulp with the D _HT(E*)D sequence, considering cost-effectiveness, pulp quality, and effluent load; however, when the steam cost is taken into consideration, the cost advantage was lost.

Original language	English
Pages	12-19
Number of pages	8
Volume	8
No	1
Specialist publication	Tappi Journal
DOIs	https://doi.org/10.32964/tj8.1.12
State	Published - Jan 2009

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title = "Optimizing alkaline extraction for eucalyptus kraft pulp bleaching",

abstract = "This paper evaluates different approaches for the (E*) stage of the DHT(E*)D sequence for eucalyptus kraft pulp bleaching to 90\%-91\% ISO brightness, considering kappa factors 0.12, 0.16, and 0.20 in the first stage. These (E*) approaches included E, (EO), (EP), (EOP), (PO), PHT, O, and (O/O) stages run at two temperatures. Results were compared on the basis of total active chlorine demand, chemical cost, pulp brightness stability and viscosity, and effluent load. We concluded that a DHT kappa factor of 0.12 and a (PO) stage run at 85°C-95°C appeared to be the most attractive approach for bleaching eucalyptus pulp with the D HT(E*)D sequence, considering cost-effectiveness, pulp quality, and effluent load; however, when the steam cost is taken into consideration, the cost advantage was lost.",

author = "Shackford, \{Lewis D.\} and Santos, \{Carlos A.\} and Colodette, \{Jorge L.\} and Alves, \{Ericka F.\}",

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doi = "10.32964/tj8.1.12",

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AU - Shackford, Lewis D.

AU - Santos, Carlos A.

AU - Colodette, Jorge L.

AU - Alves, Ericka F.

PY - 2009/1

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AB - This paper evaluates different approaches for the (E*) stage of the DHT(E*)D sequence for eucalyptus kraft pulp bleaching to 90%-91% ISO brightness, considering kappa factors 0.12, 0.16, and 0.20 in the first stage. These (E*) approaches included E, (EO), (EP), (EOP), (PO), PHT, O, and (O/O) stages run at two temperatures. Results were compared on the basis of total active chlorine demand, chemical cost, pulp brightness stability and viscosity, and effluent load. We concluded that a DHT kappa factor of 0.12 and a (PO) stage run at 85°C-95°C appeared to be the most attractive approach for bleaching eucalyptus pulp with the D HT(E*)D sequence, considering cost-effectiveness, pulp quality, and effluent load; however, when the steam cost is taken into consideration, the cost advantage was lost.

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DO - 10.32964/tj8.1.12

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SP - 12

EP - 19

JO - Tappi Journal

JF - Tappi Journal

ER -

Optimizing alkaline extraction for eucalyptus kraft pulp bleaching

Abstract

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