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ABSTRACT
Removing most of the water in the acetone + n-butanol + ethanol (ABE fermentation broth can reduce energy consumption and improve the biobutanol market competitiveness. Understanding the dehydration process of ethanol, acetone, and n-butanol can guide the fermentation process for the subsequent separation, which led to an investigation into the salting-out effects of K2CO3 on aqueous ethanol solution, aqueous acetone solution and n-butanol+water system at various temperatures. Elevating the salt concentration has the potential to decrease the water content of these solutes as well as the content of ethanol or acetone and n-butanol in the salt-free aqueous phase. The distribution and selectivity coefficients of ABE were also enhanced. As a result, the recovery and dehydration ratio of ethanol or acetone, or n-butanol, was also improved. The strong hydrophilicity of acetone and ethanol makes the recovery and dehydration ratio of n-butanol difficult. On the same basis(50% K2CO3), the dehydration ratios of ethanol, acetone, and n-butanol were 91.43%, 96.21%, and 97.52%, respectively. Thus, the dehydration capacity gave the following trend: n-butanol>acetone>ethanol. By raising the temperature，it was possible to increase the amount of ethanol，acetone，or n-butanol in the organic phase while decreasing their amounts in the aqueous phase. The ratio of n-butanol’s recovery and dehydration can be improved by raising the temperature.
Abbreviation list
| D1 | = | partition coefficient of water |
| D2 | = | partition coefficient of ethanol |
| D3 | = | partition coefficient of acetone |
| D4 | = | partition coefficient of n-butanol |
| Ri | = | recovery of ethanol, acetone, and n-butanol |
| m1 | = | mass of the salt-free organic phase |
| ci | = | mass fraction of each component of the salt-free organic phase |
| m0 | = | initial mass of the system before the addition of salt |
| ci0 | = | initial mass fraction of each component in the system before the addition of salt |
| m2 | = | mass of the salt-free aqueous phase |
| ω11 | = | mass fraction of water in the salt-free aqueous phase |
Disclosure statement
No potential conflict of interest was reported by the author.
Additional information
Notes on contributors
Xiangling Chang
Xiangling Chang, born in 1969, Master, Associate professor, Secretary of the General Party Branch of the School of Energy and Chemical Engineering. She taught courses such as ”Inorganic Chemistry”, ”Environmental Chemistry” and ”Introduction to Environmental Protection”. She has presided over more than 10 provincial and municipal scientific research projects, published nearly 20 papers, and edited many higher vocational and technical textbooks such as Inorganic and Analytical Chemistry, Environmental Comprehensive Experiment, Introduction to Environmental Protection, and Environmental Impact Assessment. She won the Henan Province teaching teacher, Henan Province outstanding education management talent, Puyang City outstanding teachers, Puyang City ”51” labor medal; Academic technology leader of Puyang City; Puyang Youth Science and Technology Award and other honorary titles. She guided students to participate in provincial vocational skills competition and won the award of excellent instructor.