Techno-Economic Analysis of Alternative Designs for Low-pH Lactic Acid Production,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Techno-Economic Analysis of Alternative Designs for Low-pH Lactic Acid Production
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-08-30 , DOI: 10.1021/acssuschemeng.1c03447
Andressa Neves Marchesan ₁ , Jean Felipe Leal Silva ₁ , Rubens Maciel Filho ₁ , Maria Regina Wolf Maciel ₁

Affiliation

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.

中文翻译：

低 pH 乳酸生产替代设计的技术经济分析

乳酸产量受发酵pH值的影响很大。对中和剂和发酵过程中产生的盐的需求对整个过程性能有重大影响。改变中和剂并允许较低的 pH 值发酵可以提高工艺盈利能力。这项工作调查了发酵参数的影响，并评估了生产乳酸的替代下游加工设计的工艺经济性。结果表明，低 pH 发酵（pH = 3.86）在发酵产量为 0.97 g/g 蔗糖时是有利可图的（内部收益率，IRR > 10%）。分解盐副产品以减少与石膏处置相关的环境负担对经济绩效有重大影响，导致比其他设计更低的 IRR。尽管盐分解过程有很高的能源需求，但它可以通过下游加工中获得的节省来补偿，因此与传统反应蒸馏相比，总体能源需求相似。与传统工艺相比，具有硫酸铵副产品的新型工艺配置显示出 IRR 高 3 pp 和燃料需求降低 30% 的潜力。因此，替代的下游工艺可以推动低 pH 值发酵，使其在没有任何中和剂的情况下优于传统工艺。与传统工艺相比，具有硫酸铵副产品的新型工艺配置显示出 IRR 高 3 pp 和燃料需求降低 30% 的潜力。因此，替代的下游工艺可以推动低 pH 值发酵，使其在没有任何中和剂的情况下优于传统工艺。与传统工艺相比，具有硫酸铵副产品的新型工艺配置显示出 IRR 高 3 pp 和燃料需求降低 30% 的潜力。因此，替代的下游工艺可以推动低 pH 值发酵，使其在没有任何中和剂的情况下优于传统工艺。

更新日期：2021-09-13

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11