Name: FELIPE SANTOS PIMENTEL
Type: MSc dissertation
Publication date: 27/02/2019
Advisor:
Name |
Role |
|---|---|
| TAISA SHIMOSAKAI DE LIRA | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| MARCELO SILVEIRA BACELOS | Internal Examiner * |
| TAISA SHIMOSAKAI DE LIRA | Advisor * |
| THIAGO PADOVANI XAVIER | Co advisor * |
Summary: Biomass pyrolysis represents a thermal treatment option aimed at the transformation of wastes into products with high added value, in particular bio-oil. When obtained from the pyrolysis of lignocellulosic biomass, it has a high content of structural oxygen, which becomes an obstacle for use as fuel. An alternative for improving the bio-oil is through the co-pyrolysis of biomass and plastic waste. Thus, the objective of this work is to evaluate the synergy of the co-pyrolysis of coffee husk and low density polyethylene (LDPE) and to analyze the effects of operational variables on the process. The behavior of thermal degradation of coffee husk and LDPE blends containing 0, 25, 50, 75 and 100% LDPE, by mass, was evaluated by means of thermogravimetric analysis, in addition kinetic and thermodynamic parameters were estimated. The mixtures showed synergy, exhibiting high reactivity and the need for smaller amounts of heat supplied for reaction occurrence, mainly the 75% LDPE composition. The following ranges of activation energy values were found: (13.55 - 177.01) kJ/mol, enthalpy: (8.48 - 170.81) kJ/mol and entropy: (-291.8 -
-62.95) J/mol. The effects of the variables: final reaction temperature, heating rate and spatial time on the yield of the liquid product were investigated. Based on the statistical analysis, it was verified that the greatest effect on product yield comes from the interac- tion between temperature and spatial time. In addition, through the desirability function, the values corresponding to the final reaction temperature, heating rate and spatial time to maximize bio-oil production were found to be 873.15 K, 10 K/min and 1.42 min, res- pectively. And finally, the major compounds in the composition of the bio-oil which are paraffins, followed by olefins, have been identified.
