On-Site X-ray Fluorescence Spectrometry Measurement Strategy for Assessing the Sulfonation to Improve Chemimechanical...

Area of Science:

• Pulp and Paper Science
• Materials Science
• Analytical Chemistry

Background:

• Minimizing fiber property variation can enhance chemimechanical pulp quality and process efficiency.
• Even distribution of sodium sulfite (Na2SO3) in chemimechanical pulping is challenging due to raw material variability and processing methods.
• Understanding microscale sulfonation is crucial for optimizing pulp properties.

Purpose of the Study:

• To develop a method for measuring microscale sulfonate distribution in wood chips and fibers.
• To assess the evenness of sodium sulfite impregnation at the fiber level.
• To provide insights for improving chemimechanical pulping processes.

Main Methods:

• Development of a miniaturized energy-dispersive X-ray fluorescence (ED-XRF) method.
• Analysis of elemental sulfur distribution within wood structures.
• Measurement of counterions (e.g., sodium, calcium) associated with sulfonate groups.

Main Results:

• The developed ED-XRF method enables effective measurement of sulfur distribution at the microscale.
• The technique provides data on the unevenness of fiber sulfonation prior to defibration.
• Sulfur distribution analysis can be performed on individual wood chips and fibers.

Conclusions:

• Accurate measurement of sulfonation distribution is essential for improving pulp properties and process efficiency.
• The miniaturized ED-XRF method is suitable for industrial laboratories.
• Further development can enhance image resolution and reduce measurement time for broader application.