HIGROSCOPICITY OF CHARCOAL PRODUCED IN DIFFERENT TEMPERATURES

Dias Júnior, Ananias Francisco; Pirola, Lucas Pereira; Takeshita, Saly; Lana, Artur Queiroz; Brito, José Otávio; Andrade, Azarias Machado de

doi:10.1590/01047760201622032175

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Articles • CERNE 22 (4) • Oct-Dec 2016 • https://doi.org/10.1590/01047760201622032175 copy

HIGROSCOPICITY OF CHARCOAL PRODUCED IN DIFFERENT TEMPERATURES

HIGROSCOPICIDADE DO CARVÃO VEGETAL PRODUZIDO EM DIFERENTES TEMPERATURAS

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

This research aimed to evaluate hygroscopicity of charcoal produced under four different final carbonization temperatures. For evaluation of hygroscopicity charcoal samples were conditioned in environments with controlled temperature and relative humidity, using saturated salt solutions. The final carbonization temperature significantly influenced the products yields and the properties of charcoal. The charcoal produced in the final temperature of 750 °C showed the highest adsorption capacity of water, indicated by the moisture content after conditioning, in the higher relative humidity environment. Correlations were observed between adsorbed moisture and the porosity of charcoal produced.

Keywords:
Charcoal quality; Porosity; Hygroscopic conditioning; Saturated salt solutions.

Variable	Final carbonization temperature
Variable	400 °C	550 °C	650 °C	750 °C
GY (%)	37.54 ± 0.46	32.71 ± 0.56	30.22 ± 0.32	28.07 ± 0.13
PL (%)	41.43 ± 0.90	45.60 ± 1.99	47.39 ± 0.44	44.16 ± 1.51
NCG (%)	21.03 ± 1.36	21.68 ± 1.43	22.37 ± 0.47	27.75 ± 1.37
FCY (%)	25.68 ± 1.32	24.39 ± 0.80	25.97 ± 0.78	26.02 ± 1.11
AD (g cm^-3)	0.346 ± 0.02	0.307 ± 0.01	0.292 ± 0.01	0.268 ± 0.02
TD (g cm^-3)	1.053 ± 0.05	1.058 ± 0.02	1.105 ±0.02	1.127 ± 0.01
P (%)	66.74 ± 2.05	70.93 ± 0.41	73.57 ± 0.31	76.23 ± 0.17
VM (%)	38.91 ± 0.34	25.16 ± 0.10	14.42 ± 0.11	7.06 ± 0.15
FC (%)	60.82 ± 0.37	74.46 ± 0.11	85.74 ± 0.37	92.61 ± 0.21
AS (%)	0.28 ± 0.03	0.39 ± 0.01	0.49 ± 0.02	0.33 ± 0.04
H_{RH 33%} (%)	1.57 ± 0.07	1.19 ± 0.09	0.80 ± 0.04	1.03 ± 0.03
H_{RH 98%} (%)	6.36 ± 0.07	6.61 ± 0.01	7.03 ± 0.05	8.93 ± 0.08

Variable	Temperature	GY	PL	NCG	FCY	AD	TD	P	VM	FC	AS	H_RH33
Temperature	1
GY	-1.00*	1
PL	0.59	-0.65	1
NCG	0.84*	-0.79*	0.05	1
FCY	0.36	-0.29	-0.10	0.46	1
AD	-1.00*	1.00*	-0.60	-0.83*	-0.27	1
TD	0.93*	-0.90*	0.41	0.85*	0.67	-0.89*	1
P	1.00*	-1.00*	0.59	0.83*	0.34	-1.00*	0.93*	1
VM	-1.00*	1.00*	-0.62	-0.81*	-0.37	0.99*	-0.93*	-1,00*	1
FC	1,00*	-1.00*	0.63	0.80*	0.38	-0.99*	0.94*	1.00*	-1.00*	1
AS	0.44	-0.51	0.97*	-0.12	-0.01	-0.44	0.33	0.45	-0.49	0.50	1
H_RH33	-0.84*	0.87*	-0.91*	-0.41	-0.26	0.83*	-0.76*	-0.84*	0.87*	-0.87*	-0.86*	1
H_RH98	0.86*	-0.81*	0.10	1.00*	0.49	-0.85*	0.88*	0.86*	-0.84*	0.83*	-0.06	-0.46

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