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Journal articles
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Open Access
Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants,TAPPI Journal December 2024

Authors: Alan W. Rudie and Peter W. Hart | TAPPI J. 17(11): 601(2018) - ABSTRACT: The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls.  For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.

Journal articles
Magazine articles
Open Access
Wheat straw as an alternative pulp fiber, TAPPI Journal December 2024

Author: Peter W. Hart | TAPPI J. 19(1): 41(2020) - ABSTRACT: The desire to market sustainable packaging materials has led to an interest in the use of various fiber types as a raw material. It has been suggested that the use of annual crops for partial replacement of wood fiber would result in more sustainable products. Several life cycle analyses (LCA) have been performed to evaluate these claims. These LCAs provided conflicting and contradictory results because of the local conditions and the specific pulping processes investigated. Selected LCAs are reviewed and the underlying reasons for these conflicting results are analyzed.

Journal articles
Open Access
Alkaline peroxide mechanical pulping of wheat straw Part 2: significance of peroxide stabilization to the brightening of wheat straw, TAPPI JOURNAL, July 2000, Vol. 83(7)

Alkaline peroxide mechanical pulping of wheat straw Part 2: significance of peroxide stabilization to the brightening of wheat straw, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
Advanced combustion and flow modeling: comprehensive model study improves recovery boiler operation, TAPPI JOURNAL, July 2000, Vol. 83(7)

Advanced combustion and flow modeling: comprehensive model study improves recovery boiler operation, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
Wood and fiber properties of hybrid poplars from southern british columbia, TAPPI JOURNAL, July 2000, Vol. 83(7)

Wood and fiber properties of hybrid poplars from southern british columbia, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
CMP and ctmp of a fast-growing tropical wood: acacia mangium, TAPPI JOURNAL, July 2000, Vol. 83(7)

CMP and ctmp of a fast-growing tropical wood: acacia mangium, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
Methanol formation during alkaline wood pulping, TAPPI JOURNAL, July 2000, Vol. 83(7)

Methanol formation during alkaline wood pulping, TAPPI JOURNAL, July 2000, Vol. 83(7)

Journal articles
Open Access
A new approach to mechanical pulping â?? pretreatment of chips by normal-to-grain compression prior to refining, TAPPI JOURNAL, September 2000, Vol. 83(9)

A new approach to mechanical pulping — pretreatment of chips by normal-to-grain compression prior to refining, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Improved ozone efficiency at reduced charges -- an electrochemical model and new experimental approach, TAPPI JOURNAL, September 2000, Vol. 83(9)

Improved ozone efficiency at reduced charges -- an electrochemical model and new experimental approach, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Addition of sodium silicate and chelant to the fas stage to bleach recycled fibers, TAPPI JOURNAL, July 2000, Vol. 83(7)

Addition of sodium silicate and chelant to the fas stage to bleach recycled fibers, TAPPI JOURNAL, July 2000, Vol. 83(7)

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