Modeling and kinetic study of bio-ethanol production from soy protein concentrate by-product

CALDEIRÃO, Lucas; TANAKA, Cyntia; IDA, Elza; SPINOSA, Wilma

doi:10.1590/1678-457X.0021

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Food Science and Technology

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Research Paper • Food Sci. Technol. 36 (2) • Apr-Jun 2016 • https://doi.org/10.1590/1678-457X.0021 copy

Modeling and kinetic study of bio-ethanol production from soy protein concentrate by-product

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The aim of this work was to evaluate a non-agitated process of bioethanol production from soybean molasses and the kinetic parameters of fermentation using a strain of Saccharomyces cerevisiae (ATCC^® 2345). Kinetic experiment was conducted in medium with 30% (w v^-1) of soluble solids without supplementation or pH adjustment. The maximum ethanol concentration was in 44 hours, the ethanol productivity was 0.946 g L^-1 h^-1, the yield over total initial sugars (Y₁) was 47.87%, over consumed sugars (Y₂) was 88.08% and specific cells production rate was 0.006 h^-1. The mathematical polynomial was adjusted to the experimental data and provided very similar parameters of yield and productivity. Based in this study, for one ton of soybean molasses can be produced 103 kg of anhydrous bioethanol.

Keywords:
alcoholic fermentation; bioethanol; soybean molasses; co-product valorization

Component	g 100 g^-1
Ashes	7.52 ± 0.05
Lipids	9.46 ± 0.26
Proteins	8.91 ± 0.08
Total sugars	64.05 ± 0.24
Total dry extract	72.61 ± 0.27

Brix	Time (h)	TS_i (g L^-1)	TS_f (g L^-1)	Et (g L^-1)	Y₁ (%)	Y₂ (%)	Productivity (g L^-1 h^-1)
20	48	126.93	56.68	22.83	35.64 ± 0.63ª	65.10 ± 2.12^b	0.474 ± 0.00^a
20	48	123.38	56.52	22.75	35.64 ± 0.63ª	65.10 ± 2.12^b	0.474 ± 0.00^a
25	72	143.88	54.26	30.82	43.09 ± 1.63ª	68.65 ± 1.92^b	0.439 ± 0.01^a
25	72	143.72	52.81	32.53	43.09 ± 1.63ª	68.65 ± 1.92^b	0.439 ± 0.01^a
30	96	190.23	95.28	40.79	39.51 ± 3.46^a	86.03 ± 2.79ª	0.401 ± 0.03^a
30	96	191.36	110.78	36.24	39.51 ± 3.46^a	86.03 ± 2.79ª	0.401 ± 0.03^a

	Experimental data			Theoretical data
Time (h)	Log (cells mL^-1)	TS (g L^-1)	Et (g L^-1)	Log (cells mL^-1)		TS (g L^-1)	Et (g L^-1)
0	7.51	170.20	4.74	7.41	174.31		0.00
2	7.51	165.62	5.21	7.53	167.65		4.06
4	7.59	161.15	6.16	7.64	160.66		8.13
6	7.66	159.55	7.27	7.74	153.42		12.13
8	7.75	150.67	11.14	7.82	146.01		16.02
10	7.89	140.66	18.88	7.90	138.52		19.79
12	7.96	131.77	22.67	7.96	131.02		23.40
14	8.08	123.93	27.73	8.02	123.59		26.84
16	8.13	115.30	31.05	8.06	116.32		30.08
18	8.14	105.97	37.13	8.10	109.29		33.10
20	8.14	98.95	39.58	8.13	102.59		35.87
22	8.15	93.40	41.63	8.16	96.28		38.36
24	8.15	88.01	43.13	8.17	90.46		40.57
28	8.15	83.33	43.14	8.19	80.60		43.99
32	8.16	78.48	43.21	8.20	73.65		45.95
36	8.16	78.24	43.61	8.19	70.27		46.24
40	8.16	77.95	43.87	8.18	71.11		44.68
44	8.16	77.71	46.37	8.17	76.82		41.08

	Time (h)	dTS (g L^-1)	dEt (g L^-1)	Y_p/s (%)	Y₁ (%)	Y₂ (%)	Productivity (g L^-1 h^-1)
Experimental data	44	92.49	41.63	45.01	47.87	88.08	0.946
Mathematical model	44	97.49	41.08	42.14	46.12	82.46	0.934

	rx (log cells mL^-1 h^-1)	rs (g L^-1 h^-1)	rp (g L^-1 h^-1)	μx (h^-1)	tg (h)
Experimental data	0.046	3.960	2.367	0.006	6.850
Mathematical model	0.037	3.559	1.701	0.005	7.908

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[1] *Corresponding author: lcrmiranda@gmail.com