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Summary

This study optimizes corn stalk processing for hemicelluloses (HC) and paper fibers. Optimal conditions balance high HC yield with preserved paper strength, showing xylan reduction impacts paper properties.

Keywords:
burst indexcorn stalkshot alkaline extractionpapermaking pulptensile indexxylan HC

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Area of Science:

  • Biomass valorization
  • Sustainable chemistry
  • Materials science

Background:

  • Corn stalks are an abundant agricultural residue.
  • Integrated processing can yield valuable products like hemicelluloses and papermaking fibers.
  • Optimizing extraction conditions is crucial for product quality and process efficiency.

Purpose of the Study:

  • To valorize corn stalks into hemicelluloses (HC) and papermaking fibers.
  • To investigate the effects of hot alkaline extraction (HAE) on HC and paper properties.
  • To optimize HAE conditions for maximizing HC yield while maintaining paper strength.

Main Methods:

  • Hot alkaline extraction (HAE) of corn stalks.
  • Analysis of xylan content in extracted hemicelluloses.
  • Evaluation of papermaking fiber properties.
  • Optimization of process parameters (NaOH concentration, time, temperature).

Main Results:

  • Extracted HC contained 44-63% xylan, with 19-35% xylan removal yield.
  • Optimal HAE conditions (1% NaOH, 33 min, 100 °C) balanced HC yield and paper strength.
  • Reduced xylan content in pulp (due to HC extraction) caused a 30-50% loss in mechanical strength.

Conclusions:

  • Integrated processing of corn stalks is feasible for producing HC and paper fibers.
  • HAE conditions significantly influence the yield and quality of HC and the properties of papermaking fibers.
  • Xylan content is a critical factor affecting the mechanical strength of paper derived from corn stalks.