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Integrated process of starch ethanol and cellulosic lactic acid for ethanol and lactic acid production

  • Biotechnological products and process engineering
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Abstract

The sequential production of bioethanol and lactic acid from starch materials and lignocellulosic materials was investigated as ethanol fermentation broth (EFB) can provide nutrients for lactic acid bacteria. A complete process was developed, and all major operations are discussed, including ethanol fermentation, broth treatment, lactic acid fermentation, and product separation. The effect of process parameters, including ethanol fermentation conditions, treatment methods, and the amount of EFB used in simultaneous saccharification and fermentation (SSF), is investigated. Under the selected process conditions, the integrated process without additional chemical consumption provides a 1.08 acid/alcohol ratio (the broth containing 22.4 g/L ethanol and 47.6 g/L lactic acid), which corresponds to a polysaccharide utilization ratio of 86.9 %. Starch ethanol can thus promote cellulosic lactic acid by providing important nutrients for lactic acid bacteria, and in turn, cellulosic lactic acid could promote starch ethanol by improving the profit of the ethanol production process. Two process alternatives for the integration of starch ethanol and cellulosic lactic acid are compared, and some suggestions are given regarding the reuse of yeast following the cellulosic SSF step for lactic acid production.

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Acknowledgments

The authors are grateful for the financial support of this research from the Fundamental Research Funds for the Central Universities (BLYJ201212), National Science Foundation of China (31070510), and Major State Basic Research Projects of China (973-2010CB732204).

Conflict of interest

The authors declare that they have no competing interests.

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Authors and Affiliations

  1. Department of Chemistry and Chemical Engineering, Beijing Forestry University, Beijing, China

    Yong Tang, Liwei Zhu & Jianxin Jiang

  2. Nanjing Academy of Wild Plant, Nanjing, 210042, China

    Weiming Zhang

  3. Chunlei Industrial Group Company, Xingtai, 054001, China

    Xinhui Shang

Authors
  1. Yong Tang
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  2. Liwei Zhu
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  3. Weiming Zhang
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  4. Xinhui Shang
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  5. Jianxin Jiang
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Correspondence to Jianxin Jiang.

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Tang, Y., Zhu, L., Zhang, W. et al. Integrated process of starch ethanol and cellulosic lactic acid for ethanol and lactic acid production. Appl Microbiol Biotechnol 97, 1923–1932 (2013). https://doi.org/10.1007/s00253-012-4461-x

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  • DOI: https://doi.org/10.1007/s00253-012-4461-x

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