Chemical from agricultural and industrial waste. Pyrolysis products from residues of palm oil industry

MELISA BERTERO; JUAN RAFAEL GARCÍA; MARISA FALCO; ULISES SEDRAN; KHOIRUN NISA MAHMUD; SUZAMI JUNAIDAH ARIFFIN; ANI IDRIS; ZAINUL ZAKARIA

Sustainable Technologies for Management of Agricultural Waste

Springer

Año: 2018; p. 1 - 154

Palm kernel shell (PKS) and empty fruit bunches, both raw (EFB-R) and pretreated by means of autoclaving (EFB-A) and microwave (EFB-M), were pyrolyzed in a fixed-bed stainless steel reactor at 550 °C. The yield of the water-solubleliquid fraction (pyroligneous acid, PA) in the pyrolysis of PKS was 26%wt. (drybasis) and in the range of 16?46%wt. when different EFB were used. The yield ofinsoluble liquid fraction (bio-oil, BO) was 9.1%wt. for PKS and up to 25%wt. in the case of EFB. Liquid and gaseous products were analyzed by conventional capillary gas chromatography. The PA from the PKS had 30%wt. of total phenolic compounds (up to 24%wt. phenol) and 46%wt. acetic acid. On the other hand, the bio-oil from PKS had 43%wt. of total phenolic compounds (up to 26%wt. phenol) and 17%wt. acetic acid. The PA from EFB contained mainly acetic acid (65.5%wt.),furfural (7.7%wt.), methanol (8.0%wt.), and phenol (15.2%wt.). When EFB waspretreated, the concentration of acetic acid in PA decreased dramatically, while the concentration of furfural increased up to ten times, this effect being more noticeable in the case of microwave pretreatment. The yields of by-products were of significance in all cases (13?23%wt. of gases and 33?52%wt. of char). These results show that the liquid products obtained from the pyrolysis of palm oil industrial wastes could be used in order to obtain chemical raw materials of worldwide extended use, while the by-products (gases and char) can be used as renewable energy sources.