(2019) Applied Energy_Bioalcohol production from acidogenic products via a two-step process: A case study of butyric acid to butanol

Cho S.-H., Kim J., Han J., Lee D., Kim H.J., Kim Y.T., Cheng X., Xu Y., Lee J., Kwon E.E.

(Elsevier Ltd) Applied Energy ISSN: 3062619 Vol.252 Issue. Article No.113482 DOI: 10.1016/j.apenergy.2019.113482

This article presents the full study (lab-scale experimental study and large-scale techno-economic analysis) results of a two-step catalytic process for the conversion of organic waste–derived butyric acid to butanol. The two-step process consists of the (1) esterification of butyric acid to methyl butyrate and (2) hydrogenolysis of this methyl butyrate to butanol. The first reaction, esterification of butyric acid, was optimized using carbon-based catalysts. The production of butanol from methyl butyrate via hydrogenolysis was investigated using bimetallic Pt–Co catalysts. The hydrogenolysis of methyl butyrate on these catalysts under optimal conditions of 250 °C, 5 MPa H₂, and a feed/catalyst weight ratio of 11.2 led to 54.1% selectivity toward 1-butanol. Based on the experimental results, an integrated process simulation model was developed to determine the economic potential of the two-step production of butanol from butyric acid. Using this model, the techno-economic feasibility of the two-step process was analyzed. The minimum selling price (MSP) of 1-butanol produced from butyric acid using this process was US$ 3.388 per gallon of gasoline equivalent (GGE). This MSP is in the range of recent biofuel market prices of US$ 2.03/GGE to US$ 3.83/GGE. © 2019 Elsevier Ltd

This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resources from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20163010092290 ). This work was also supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (Ministry of Education) (No. 2018R1D1A1A09082841 ). The atomistic simulation work in this study was performed at Louisiana State University using high-performance computing resources provided by LSU ( http://hpc.lsu.edu ). X.C. and Y.X. acknowledge support by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Catalysis Science Program, under Award # DE-SC0018408.