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

• 作者: Juliano Missau Daniel Assumpc?o Bertuol Eduardo Hiromitsu Tanabe
• 来源期刊: 颗粒学报（英文版）
• 年，卷（期）: 2021,（1）
• 页码范围: 164-172
• 页数: 9页
• 语种: 英文

摘要

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 improv-ing crude wax filtration,with the filtration time,temperature,and pressure held constant at 1 h,170℃,and 2.5 bar,respectively.Oily wax was then produced by pyrolysis of high-density polyethylene(HDPE)waste in the temperature range 425-475 ℃.The best filter aid was perlite,which had a filtrate production rate of 5.47 × 10-5 m3/h.The highest oily wax yield(87.8％)was achieved at a pyrolysis temperature of 425 ℃.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％.