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首页> 外文期刊>Journal of food engineering >Progressive stirred freeze-concentration of ethanol-water solutions
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Progressive stirred freeze-concentration of ethanol-water solutions

机译：乙醇水溶液的逐步搅拌冷冻浓缩

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摘要

Progressive freeze-concentration is a technology to separate water from solutions by freezing. In the present investigation, ethanol-water solutions were freeze-concentrated by the progressive stirred technique. The freezing stage was carried out in a stirring vessel. Solute recovery by the fractionated thawing of ice was also studied. The effects of stirring speed (500, 1000, and 2000 rpm), initial concentration of the solution (3%, 5%, and 8% ethanol), and temperature of the thawing stage (0, 10, and 20 degrees C) on the solute yield and average distribution coefficient were determined using response surface analysis. The ethanol concentration was found to have increased by 13 and 2.1 times at the end of the freeze concentration process. It was found that the initial concentration had a significant effect on the distribution coefficient. In addition, the average yield was increased by 28% by fractionated thawing. Subsequently, a non-dimensional analysis of the distribution coefficient was developed to yield a model to predict the distribution coefficient as a function of the Reynolds number, the relationship between the average ice growth rate and the stirring speed, the agitator diameter, and the liquid fraction. This technique proved to be valid with respect to the concentration of ethanol-water solutions, with better yields being obtained at low initial concentrations. This model is the first of its kind to describe the ethanol-water interaction in agitated freeze-concentration systems. (C) 2018 Elsevier Ltd. All rights reserved.
机译：渐进式冷冻浓缩是一种通过冷冻将水与溶液分离的技术。在本研究中，通过逐步搅拌技术将乙醇-水溶液冷冻浓缩。冷冻阶段在搅拌容器中进行。还研究了通过冰的分级解冻回收溶质的方法。搅拌速度（500、1000和2000 rpm），溶液的初始浓度（3％，5％和8％乙醇）和解冻阶段的温度（0、10和20摄氏度）对温度的影响使用响应面分析确定溶质的收率和平均分配系数。发现在冷冻浓缩过程结束时，乙醇浓度增加了13倍和2.1倍。发现初始浓度对分配系数有显着影响。此外，通过部分解冻，平均产量提高了28％。随后，对分布系数进行了无量纲分析，从而产生了一个模型，用于预测作为雷诺数，平均冰生长速率与搅拌速度，搅拌器直径和液体之间的关系的分布系数的函数。分数。对于乙醇-水溶液的浓度，该技术被证明是有效的，在较低的初始浓度下可获得更好的产率。该模型是同类中第一个描述搅拌式冷冻浓缩系统中乙醇与水相互作用的模型。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of food engineering》 |2018年第5期|71-79|共9页
  • 作者

    Osorio M.; Moreno F. L.; Raventos M.; Hernandez E.; Ruiz Y.;

  • 作者单位

    Univ La Sabana, Design & Proc Management, Campus Univ Puente Comun, Chia, Cundinamarca, Colombia;

    Univ La Sabana, Agroind Proc Engn, Campus Univ Puente Comun, Chia, Cundinamarca, Colombia;

    Univ Politecn Cataluna, Agri Food Engn & Biotechnol Dept, Terradas 8, Barcelona 08860, Spain;

    Univ Politecn Cataluna, Agri Food Engn & Biotechnol Dept, Terradas 8, Barcelona 08860, Spain;

    Univ La Sabana, Agroind Proc Engn, Campus Univ Puente Comun, Chia, Cundinamarca, Colombia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Freeze concentration; Ethanol; Response surface; Dimensionless analysis;

    机译：冻结浓度;乙醇;响应面;无量纲分析;

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