Ethanol removal by vacuum-assisted gas stripping: Influence of operating conditions

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-06-29 DOI:10.1016/j.cep.2024.109873

Letícia P. Almeida , Mariane M. Buffo , Rauber D. Pereira , Antonio J.G. Cruz , Mateus N. Esperança , Alberto C. Badino

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Abstract

One way to overcome the inhibitory effects caused by ethanol on yeast cell growth is the use of extractive fermentation, whereby ethanol is removed from the fermentation broth as it is produced. The present work investigates ethanol removal from solution by vacuum-assisted gas stripping, which is a promising method for enhancing performance, compared to conventional gas stripping. Evaluation was made of the effects of carbon dioxide flow rate (ϕ_CO2), temperature (T), and pressure (P) on ethanol removal performance. Bench-scale assays were performed using a 2-L bubble column containing 10 % v/v ethanol solution, with monitoring of the gas and liquid phases by FT-MIR spectroscopy. The ethanol entrainment factor (F_E) increased with ϕ_CO2 and temperature, but decreased at higher pressure. Only ϕ_CO2 had significant and positive effects on the concentration factor (F_C) and selectivity (α_E/W), within the operating ranges of the variables studied. An ethanol removal model was obtained that provided an accurate description of the process behavior, with good agreement between the experimental and simulated data. In addition, the energy requirement for ethanol removal by vacuum-assisted gas stripping in the bioreactor was lower than for the conventional stripping process.

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通过真空辅助气提去除乙醇：操作条件的影响

克服乙醇对酵母细胞生长的抑制作用的方法之一是使用萃取发酵法，即在产生乙醇时将其从发酵液中去除。与传统的气提法相比，真空辅助气提法是一种很有前途的提高性能的方法。评估了二氧化碳流速（ϕCO2）、温度（T）和压力（P）对乙醇去除性能的影响。使用含有 10 % v/v 乙醇溶液的 2 升气泡塔进行了基准规模试验，并通过傅立叶变换红外光谱对气相和液相进行了监测。乙醇夹带系数（FE）随 ϕCO2 和温度的升高而增大，但在压力较高时有所减小。在所研究变量的工作范围内，只有 ϕCO2 对浓缩因子（FC）和选择性（αE/W）有明显的积极影响。所获得的乙醇去除模型能够准确描述工艺行为，实验数据与模拟数据之间具有良好的一致性。此外，在生物反应器中通过真空辅助气体汽提去除乙醇所需的能量低于传统汽提工艺。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.