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Catalytic cracking to optimize pyrolysis of plastic waste: preliminary study

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AIM: To study thermochemical recycling of waste agricultural plastics by catalytic pyrolysis in order to obtain a fuel; HIPOTHESIS: It is possible to improve the production of pyrolytic oil of low-density polyethylene by using zeolite ZSM-5 as a catalyst; OBJECTIVE: To study the influence of the quantity of zeolite ZSM-5 catalyst on the pyrolytic oil production; METHODS: • Feedstock: Low-density polyethylene (LDPE); spherical pellets (2.5 mm diameter) • Pyrolysis: Auger reactor (figure 1) at 559 C and 24 min of residence time • Catalyst: Zeolite ZSM-5 in pellets • Study variable: Catalyst quantity (0, 13, 27 and 40 mg) for 130 g of LDPE plastic
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AIM
To study thermochemical recycling of waste
agricultural plastics by catalytic pyrolysis in
order to obtain a fuel
HPOTHESIS
It is possible to improve the production of
pyrolytic oil of low-density polyethylene by
using zeolite ZSM-5 as a catalyst
OBJECTIVE
To study the influence of the quantity of zeolite
ZSM-5 catalyst on the pyrolytic oil production.
METHODS
Feedstock: Low-density polyethylene (LDPE);
spherical pellets (2.5 mm diameter)
Pyrolysis: Auger reactor (figure 1) at 559 C and
24 min of residence time
Catalyst: Zeolite ZSM-5 in pellets
Study variable: Catalyst quantity (0, 13, 27 and
40 mg) for 130 g of LDPE plastic
joahnn.palacios@irda.qc.ca
Joahnn H. PALACIOS1, Stéphane GODBOUT1, Maria Camila DIAZ-ACOSTA1,2,3, Patrick BRASSARD1,
Dan ZEGAN1, Étienne LE ROUX1, Patrice SEERS3
1 32
Paper # 601571
Feed hopper
Pyrolysis reactor
Condenser 1
Oil tank
Biochar tank
Screw system
PYROLYSIS HAS A HIGH POTENTIAL FOR
RECYCLING AGRICULTURAL PLASTIC
Figure 1. Schema of Auger reactor used for pyrolysis of plastic
N2input
Pyrolytic
product
Without
catalyst
With catalysis
Cartridge 1
(13 g)
Cartridge 2
(27 g)
Cartridge 3
(40 g)
(g) (%) (g) (%) (g) (%) (g) (%)
Condensed
product 68.5 52.7% 51.8 39.8% 57,25 44,0% 45.5 35.0%
SD. 0.00 1,77 1.27
RSD. 0.0% 3,1% 2.8%
Solid from
char canister 56.1 43.2% 50.8 39.1% 57 43,8% 60.8 46.8%
SD. 1.13 3,11 0.57
RSD. 2.2% 5,5% 0.9%
Gas and
losses 5.4 4.2% 27 21.1% 16 12,1% 24 18.2%
SD. 1.13 4,88 1.84
RSD. 4.1% 31,0% 7.8%
Figure 2. Schematic view of the cartridge for the catalytic system
(left) for placing in the char canister (right) of the pyrolysis reactor
Table 1. Mass and yield of each pyrolysis product
Pyrolysis experience Without
catalyst
Cartridge 1
(13 g)
Cartridge 2
(27 g)
Cartridge 3
(40 g)
Sample origin C1 R1 C1 R1 C1 R1 C1 R1
Heating value (MJ/kg) 44.50 44.23 45.10 45.14 45.56 44.96 45.31 45.11
SD. 0.120 0.147 0.383 0.053 0.052
RSD 0.3% 0.3% 0.9% 0.1% 0.1%
Total energy (MJ) 0.76 1.90 0.91 1.19 1.10 1.01 0.83 0.84
SD. 0.179 0.096 0.007 0.094 0.187
RSD 15.1% 8.8% 0.7% 11.3% 22.3%
Table 2. Heating value and total energy of condensed products
(condenser 1)
Condenser 2
LDPE
feedstock
0 mg
catalyst
13 g catalyst 27 g catalyst 40 g catalyst
Figure 3. Plastic feedstock (LDPE) and condensed fractions
Catalytic Pyrolysis of Agricultural Plastic Waste
Preliminary Study
RESULTS AND DISCUSSION
Condensed product yield was reduced by
using the catalytic system (13.6-33.6%)
Condensed products seem be more
homogeneous increasing catalyst
Adequate consistency (reproducibility) of the
method: low standard deviation (SD) and
relative standard deviation (RSD)
The increase of the solid residence time from
3 to 24 min increased the condensed product
yield, from 33.4% to 52.7%, respectively.
(compared to Godbout et al., 2017)
CONCLUSIONS
The condensed products were not in a oily
form (appearance is like cream)
Carbon chains have to be reduced even more
(pre- or post-treatment needed)
Condensed product obtained from pyrolysis
with catalyst was more homogeneous
Catalytic system reduced yield
Long residence time favored condensed
product yield
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