Techno-economic analysis of extraction-based separation systems for acetone, butanol, and ethanol recovery and purification

Bioresources and Bioprocessing

Table 3 Energy evaluation at several conditions of extractive processes for ABE recovery from fermentation

Process	Substrate (g/l)	X^a	ABE yield^b	Butanol titer (g/l)	ABE titer (g/l)	Pressure EBC (atm.)	H ^c_s	IES	Extractant ratio^d
DEx	200	0.8	0.311	10.2	27.4	1.7	6.9	0.56	10.1
	200	1	0.388	10.3	30.1	1.7	5.8	0.76	9.8
	200	1	0.388	8.3	23.7	1.7	6.8	0.74	18.7
	300	0.8	0.311	10.2	31.3	1.7	5.3	0.59	10.9
	300	1	0.388	10.1	32.8	1.7	5.5	0.77	10.5
	500	0.8	0.311	10.2	35.3	0.1	4.9	0.60	11.3
	500	1	0.388	10.3	37.0	0.1	4.7	0.79	10.2
	Ideal			10.1	50.0	0.1	2.6 (2.5, [Kurkijärvi et al. 2014)]	0.84	7.8
HTEx	200	0.8	0.311	10.2	23.7	1.7	8.1	0.53	24
	200	1	0.388	10.2	25.3	1.7	7.1	0.73	26
	300	1	0.388	10.2	28	1.7	6.2	0.75	29
	500	1	0.388	10.4	32.7	1.7	6.0	0.76	30
	Ideal			10.3	64.2	0.1	3.6 [3.6, (Kraemer et al. 2011)]	0.81	26.8
MEx OAL/DAL (80–20)	200	0.8	0.311	10	27	0.1	6.6	0.56	12.3
	300	1	0.388	10.2	33.5	0.1	6.2	0.75	14
	500	1	0.388	10.4	39.2	0.1	6.1	0.75	14
	Ideal			10.2	50.2	0.1	2.9	0.83	13.6
DSD OAL	200	0.8	0.311	10.4	26.2	1.7	6.4	0.57	14.4
	200	1	0.388	8.3	23.1	1.7	5.7	0.76	25.0
	300	1	0.388	10.3	29.9	1.7	4.7	0.79	16.8
	500	1	0.388	10.3	34.4	1.7	5.0	0.78	17.8
	Ideal			10.3	49.8	0.1	2.6	0.84	16.0
DSD OAL/DAL (80–20)	200	0.8	0.311	10	27	0.1	6.8	0.56	12.3
DSD OAL/DAL (80–20)	Ideal			10.1	50.2	0.1	3.1	0.82	13.6

IES ideal efficiency of separation, Ideal substrate concentration as high as extractant selectivity, glucose conversion of 100%, gases in the downstream were not considered, non-pressure drop, trays, efficiency of 100% was assumed
^aX conversion
^bABE yield (g-ABE/g-total-glucose)
^c H _s (MJ-ABE/kg-fuel) energy requirement of the separation system
^dSolvent ratio, extractant flow/solvent flow