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Novel deinking method of used A4 paper in the office for internal reuse


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By Yerkenaz Zholymbayeva, Nazarbayev University.This was presented during the New Ideas for the Paper Industry: Young Researchers' Presentations session, organised as part of European Paper Week 2015. More at

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Novel deinking method of used A4 paper in the office for internal reuse

  1. 1. paper recycling at your desktop Zholymbayeva Y., Tastanbekov D., Inglezakis V., Akhmedzhanov M.,Mukatay A., Yerkhanov B. CEPI – EFPRO 4th Early Stage Researchers Workshop 2015 Novel deinking method of used A4 paper in the office for internal reuse
  2. 2. Outline Introduction: Challenge №1 and №2 Research directions Theory ultrasound and SCF CO2 Laboratory prototype First results High pressure chamber, its modelling Outlook
  3. 3. TONS OF OFFICE PAPER DISPOSED EVERY DAY WORLDWIDE Economic: Increasing office paper consumption goes in parallel with increasing cost of natural paper pulp. Despite the spread of digital media, worldpaperconsumptionincreasesoverpastdecades. Challenge #1
  4. 4. Ecologic: “paper trail” associated with woods extinction and carbon emission during traditional “wet” paper production Challenge #2 2
  5. 5. The research on toner removal is developing into two directions
  6. 6. Limitations: A standard A4 sheet made from 80 g/m2 paper. 210 by 297 millimetres (8.27 in × 11.7 in). Company: International Paper Printed in laser printer Xerox Phaser 3300 MFP 4cm2 of paper sample
  7. 7. 1. Heater 2. sand bath 3. flask for boiling solvent 4. drain tube 5. condenser 6. the drain valve 7. the hole for controlled discharge 8. the hole to prevent overfilling 9. tank cleaning paper 10. refrigerator for the condensation of organic solvent 11. Piezo 12. magnetic stirrer 13. the tube to evaporate the solvent 14. 1-14.4 thermocouple System for deinking office paper and recycling the used organic solvent
  8. 8. 1 Rotor 2 Belt 3 solvent 4 - Mount the stabilizer 5 - Stabilizer (Teflon) 6 - tank with a solvent (rotary vessel) 7 Seal (to reduce friction) 8Teflon Stand 9 - Cover 10 - Paper sample 11 - Water 12 - Ultrasonic Installation that implements the method of deinking paper with ultrasound in an organic solvent at a rotating tank.
  9. 9. Theory- Ultrasound • High frequency mechanical waves above the human limit of audibility • Ultrasound can propagate in gases, liquids and solids • Source of the ultrasonic might be ultrasonic bath, generator, homogenizer and apparatus for cosmetic purpose
  10. 10. Comparative table of samples after treatment.
  11. 11. Theory- Supercritical fluid CO2 . Above its critical temperature (31 °C) and critical pressure (74 bar)
  12. 12. The appearance of a modified high-pressure chamber Cracked acrylic glass under the influence of any additional stresses arising as the diffusion of supercritical CO2 into the surface. Sketch of the flange with ultrasonic generator on top, photograph prepared flange with ultrasonic generator on right, assembled high pressure chamber.
  13. 13. Results from SCF CO2 After experiments with different solvents visible results of purification of a paper from a toner was not observed. These results indicate that we need more powerful ultrasonic generator embedded into high-pressure chamber. Paper sample placed in a chamber with solvent
  14. 14. Sound pressure levels in the pressure chamber. Calculations show that a high transmittance not been achieved even in the case of some of the best location of the source of ultrasound Sound pressure levels in the pressure chamber at the operating frequency of 25 kHz Some modeling result determined by finite element method
  15. 15. OUTLOOK develop improved version of borosilicate glass based installation prototype that will deink paper and recycle used organic solvents embed piezo into high-pressure chamber scale laboratory experiments to A4 size Analysis of the economic viability find partners and collaborators among researchers around world
  16. 16. THANK YOU FOR YOUR ATTENTION FOR FURTHER INFORMATION CONTACT: Yerkenaz Zholymbayeva, PI "Nazarbayev University Research and Innovation System“, Astana, Kazakhstan Mobile phone: +77028648186 Email: