期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 9, 期 36, 页码 12120-12131出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c03447
关键词
lactic acid; fermentation; downstream processing; liquid-liquid extraction; process simulation; techno-economic analysis; gypsum-free
资金
- CNPq, National Council for Scientific and Technological Development.Brazil
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior. Brasil (CAPES) [001]
- Sao Paulo Research Foundation (FAPESP) [2015/20630-4, 2016/10450-1]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [16/10450-1] Funding Source: FAPESP
Lactic acid production is highly influenced by fermentation pH, and alternative downstream processing designs play a crucial role in the economic performance. Low-pH fermentation shows economic potential, but salt decomposition significantly impacts economic performance.
Lactic acid production is highly affected by the fermentation pH. The need for neutralizing agents and the salts produced during fermentation have a significant impact on the overall process performance. Changing the neutralizing agent and allowing lower pH fermentation can improve the process profitability. This work investigates the impact of fermentation parameters and evaluates the process economics of alternative downstream processing designs to produce lactic acid. The results show that low-pH fermentation (pH = 3.86) was profitable (internal rate of return, IRR > 10%) at a fermentation yield of 0.97 g/g sucrose. Decomposing the salt subproduct to reduce the environmental burden associated with gypsum disposal has a significant impact on the economic performance, resulting in a lower IRR than the other designs. Although the salt decomposition process has a high energy demand, it is compensated by the savings obtained in the downstream processing, thus resulting in a similar overall energy demand when compared to conventional reactive distillation. A novel process configuration with ammonium sulfate subproduct shows potential for 3 p.p. higher IRR and up to 30% lower fuel demand in comparison with the conventional process. Therefore, alternative downstream processes could drive low-pH fermentation to outperform the conventional process without any neutralizing agent.
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