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

Outline

Introduction: Challenge №1 and №2 Research directions Theory ultrasound and SCF CO2 Laboratory prototype First results High pressure chamber, its modelling Outlook

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,

world paper consumption increases over past decades.

Challenge #1

Ecologic: “paper trail” associated with woods extinction and carbon emission during traditional “wet” paper production

Challenge #2 2

The research on toner removal is developing into two directions

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

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

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.

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

Comparative table of samples after treatment.

Theory- Supercritical fluid CO2 . Above its critical

temperature (31 °C) and critical pressure (74 bar)

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.

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

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

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

THANK YOU FOR YOUR ATTENTION FOR FURTHER INFORMATION CONTACT:

Yerkenaz Zholymbayeva,

PI "Nazarbayev University Research and Innovation System“, Astana,

Kazakhstan

Mobile phone: +77028648186

Email: yerkenaz.zholymbayeva@nu.edu.kz