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Journal articles
Magazine articles
Open 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.

Journal articles
Magazine articles
Open Access
Crossflow filtration of green liquor for increased pulp production, improved green liquor quality, and energy savings, TAPPI JOURNAL October 2020

ABSTRACT: A new green liquor filtration system has been installed and commissioned at the Ence pulp mill in Pontevedra, Spain. The filtration system is based on microfiltration and was developed in collaboration with the KTH Royal Institute of Technology in Stockholm, Sweden. The patented method for efficient purification of green liquor decreases the non-process element (NPE) content by providing more efficient solids/liquid separation, reducing energy and chemical consumption in pulp mills and increasing production capacity by eliminating certain capacity bottlenecks. The process has been continuously tested at the Aspa Bruk Mill outside Askersund, Sweden, since 2013. The technology has proven to create nearly particulate-free green liquor during the purification process. The technology can also be used to polish white liquor to provide higher pulp quality.To provide for a simple and cost-effective installation, the system was designed as a skid-mounted unit that is pre-piped, instrumented, and tested before shipment. The system is modular and allows for easy expansion of capacity. This paper discusses the process design, process integration, and startup of the new system, along with experiences from the first months of operation.

Conference papers
Applications of Infrared Thermography in Industrial Facilities, 20PEERS Conference

Applications of Infrared Thermography in Industrial Facilities, 20PEERS Conference

Conference papers
Hydraulic Root Cause Failure Analysis, 20PEERS Conference

Hydraulic Root Cause Failure Analysis, 20PEERS Conference

Conference papers
New Revenue Opportunities for Pulp and Paper Sector from Carbon Capture, 20PEERS Conference

New Revenue Opportunities for Pulp and Paper Sector from Carbon Capture, 20PEERS Conference

Conference papers
FEL1 and 2 • The Beginnings of Successful Paper Machine Conversions, 20PEERS Conference

FEL1 and 2 • The Beginnings of Successful Paper Machine Conversions, 20PEERS Conference

Conference papers
Down Flow Cooking Process Optimization • A Case Study At A Southern US Mill, 20PEERS Conference

Down Flow Cooking Process Optimization • A Case Study At A Southern US Mill, 20PEERS Conference

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

No Cost Solution for Wood Chip Handling, 20PEERS Conference

Conference papers
Energy Saving Potential of Screen Fractionation for Production of BCTMP, 20PEERS Conference

Energy Saving Potential of Screen Fractionation for Production of BCTMP, 20PEERS Conference

Conference papers
Development of Novel Acoustic Sensors with Learning Algorithm to Forecast Dissolving Tank Anomalies, 20PEERS Conference

Development of Novel Acoustic Sensors with Learning Algorithm to Forecast Dissolving Tank Anomalies, 20PEERS Conference

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