Development of a nanostructured filter for pyrolysis wax purification: Effects of particulate filter aids--颗粒学报PARTICUOLOGY

Missau, J., Bertuol, D. A., & Tanabe, E. H. (2021). Development of a nanostructured filter for pyrolysis wax purification: Effects of particulate filter aids. Particuology, 54, 164-172. https://doi.org/10.1016/j.partic.2020.02.005

Development of a nanostructured filter for pyrolysis wax purification: Effects of particulate filter aids

Juliano Missau, Daniel Assumpção Bertuol, Eduardo Hiromitsu Tanabe ^*

Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria * UFSM, Avenida Roraima 1000, 97105-900, Santa Maria, RS, Brazil

10.1016/j.partic.2020.02.005

Volume 54, February 2021, Pages 164-172

Received 18 October 2019, Revised 3 February 2020, Accepted 5 February 2020, Available online 25 April 2020, Version of Record 28 January 2021.

E-mail: edutanabe@yahoo.com.br

Highlights

Nanofiber-coated filter was used for purification of crude and pyrolysis waxes.
Different filter aids were evaluated for purification of crude and pyrolysis waxes.
Particle diameter and filter aid shape strongly influences wax filtration.
Nanofiber-coated filter plus perlite filter aid increased the yield of filtered wax.
The filtered oily wax became clearer, with impurities practically eliminated.

Abstract

Wax obtained from the pyrolysis of polyethylene waste can contain inorganic contaminants and must be purified before application. We evaluated different filter aids (perlite, sand, and rice husk ash) for the filtration of a crude wax and a pyrolysis wax through a filter medium that was coated with nylon 6 nanofibers to improve filtration efficiency. We first examined the performance of the filter aids in improving crude wax filtration, with the filtration time, temperature, and pressure held constant at 1 h, 170 °C, and 2.5 bar, respectively. Oily wax was then produced by pyrolysis of high-density polyethylene (HDPE) waste in the temperature range 425⿿475 °C. The best filter aid was perlite, which had a filtrate production rate of 5.47 ÿ 10⁵ m³/h. The highest oily wax yield (87.8%) was achieved at a pyrolysis temperature of 425 °C. The assembly comprising the filter medium coated with nylon 6 nanofibers plus perlite as a filter aid was most suitable for removing impurities from the oily wax generated by the HDPE pyrolysis as it achieved a purification efficiency of 99.9%.

Graphical abstract

Keywords

HDPE pyrolysis wax; Plastic solid waste; Nanofiber-coated filter; Filter aidsFiltration

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