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Related Experiment Videos

Rice straw pulp obtained by using various methods.

Alejandro Rodríguez1, Ana Moral, Luis Serrano

  • 1Chemical Engineering Department, Campus of Rabanales, C-3 University of Córdoba, 14071 Córdoba, Spain. q42ropaa@uco.es <q42ropaa@uco.es>

Bioresource Technology
|July 31, 2007
PubMed
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Rice straw is a viable alternative for producing cellulosic pulps. Soda pulping with anthraquinone additive yielded the best paper properties, demonstrating its potential in the paper industry.

Area of Science:

  • Agricultural Science
  • Materials Science
  • Chemical Engineering

Background:

  • Agricultural waste, such as rice straw, presents an opportunity for sustainable raw material sourcing in the pulp and paper industry.
  • The chemical composition of rice straw, including holocellulose, alpha-cellulose, and lignin content, is comparable to traditional woody and non-woody sources.
  • Investigating alternative pulping methods for rice straw is crucial for resource optimization and waste valorization.

Purpose of the Study:

  • To evaluate rice straw as a raw material for cellulosic pulp production.
  • To compare the efficacy of different pulping methods (soda, potassium hydroxide, Kraft) and additives (anthraquinone, parabenzoquinone) on rice straw.
  • To determine the optimal pulping conditions for producing high-quality paper sheets from rice straw.

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Main Methods:

  • Rice straw was subjected to pulping using soda, potassium hydroxide, and Kraft processes with varying reagent concentrations, temperatures, and durations.
  • Pulping experiments were conducted under two sets of conditions: 10% reagent at 170°C for 60 min, and 15% reagent at 180°C for 90 min, with a solid/liquid ratio of 6.
  • Paper sheets were fabricated from the pulped materials, and their properties, including drainage index, breaking length, stretch, and burst index, were evaluated.

Main Results:

  • The holocellulose, alpha-cellulose, and lignin content of rice straw were found to be 60.7%, 41.2%, and 21.9% respectively.
  • Pulping with 15% soda and 1% anthraquinone (AQ) at 180°C for 90 min yielded the best results.
  • The resulting paper sheets exhibited superior performance characteristics: a drainage index of 23° SR, breaking length of 3494 m, stretch of 3.34%, and burst index of 2.51 kN/g.

Conclusions:

  • Rice straw is a suitable non-wood raw material for producing cellulosic pulps with properties comparable to wood and other non-wood sources.
  • The soda pulping process, particularly with the addition of anthraquinone, is effective for extracting high-quality pulp from rice straw.
  • Optimized pulping conditions significantly enhance the physical and mechanical properties of paper derived from rice straw, highlighting its potential for industrial application.