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Conference papers
Rapid Upset Recovery Solutions ForWastewater Treatment Syste

Rapid Upset Recovery Solutions ForWastewater Treatment Systems, 2016 PEERS

Conference papers
Low-speed bearing monitoring • Challenges and Solutions, 201

Low-speed bearing monitoring • Challenges and Solutions, 2016 PEERS

Conference papers
OEM Involvement for Chip Quality Solutions, 2018 PEERS

OEM Involvement for Chip Quality Solutions, 2018 PEERS

Conference papers
Novel Chemical Solution Addresses Organic Fouling in Pulp Mi

Novel Chemical Solution Addresses Organic Fouling in Pulp Mill Stripping Systems, 2017PEERS

Conference papers
No Cost Solution for Wood Chip Handling, 20PEERS Conference

No Cost Solution for Wood Chip Handling, 20PEERS Conference

Conference papers
Deinking Process Water Flotation: an Innovative Solution to

Deinking Process Water Flotation: an Innovative Solution to Improve Deinking and Paper Making Processes Efficiency, 2016 PEERS

Conference papers
The Benefits of Powerhouse Advanced Process Control (APC) So

The Benefits of Powerhouse Advanced Process Control (APC) Solutions, 2016 PEERS

Journal articles
Magazine articles
Open Access
Kraft pulp bleaching with a P-stage catalyzed by both bicarbonate and TAED, TAPPI Journal July 2019

ABSTRACT: Peroxide bleaching of softwood and hardwood (eucalypt) kraft pulps was performed in solutions of sodium bicarbonate (NaHCO3), sodium carbonate (Na2CO3), and sodium hydroxide (NaOH). The conventional P stage (hydrogen peroxide + sodium hydroxide; H2O2 + NaOH) was the most effective brightening system without an additional activator. However, peroxide activation by bicarbonate anion (HCO3•) was obvious in all cases where NaHCO3 or Na2CO3 was used. When N,N,N’,N’-tetraacetylethylenediamine (TAED) was added to the bleaching sys-tem, Na2CO3 as the alkali source afforded equal or slightly higher bleached brightness compared to NaOH usage for both the softwood and hardwood pulps. This outcome is attributed to simultaneous peroxide activation by HCO3• and TAED. When applied to the eucalypt pulp, the H2O2/Na2CO3/TAED bleaching system also decreased the bright-ness loss due to thermal reversion.

Journal articles
Magazine articles
Subscription Access
Development of a fast brightness testing method for mechanical pulp based on microwave oven drying, TAPPI Journal June 2020

ABSTRACT: Brightness is an important quality parameter for pulp products, and it is important to have reliable measurement of pulp brightness in a timely manner for process control and/or quality control purposes. In these circumstances, a quick testing method for pulp brightness is highly desirable.A rapid handsheet brightness testing method for lignin-rich mechanical pulp has been developed, which is based on the use of tap water to make handsheets and microwave ovens to rapidly dry the handsheet. Microwave oven fast drying decreased the handsheet brightness of mechanical pulp by 5•6 points due to the lignin-originated discol-oration reactions. The spray of ascorbic acid and ethylenediaminetetraacetic acid (EDTA) solutions to the handsheet can effectively inhibit these lignin discoloration reactions.With 0.2% ascorbic acid and 0.2% EDTA spraying on the wet pulp handsheet, the brightness of the handsheet from a peroxide-bleached stone groundwood pulp after the microwave oven fast drying method was similar to that obtained from the same pulp but following TAPPI Standard Test Method T 272 sp-12 “Forming handsheets for reflectance testing of pulp (sheet machine procedure)”. The effect of handsheet dryness on the handsheet brightness was also studied, and the results showed that the brightness reading was almost constant in the dryness range of 70% to 90%. The method developed is a reliable, fast brightness testing method for lignin-rich pulp that is of practical interest in industrial operations.

Conference papers
Microbiological Influenced Corrosion, 19PEERS

Microbiological Influenced Corrosion, 19PEERS