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首页> 外文期刊>Crystal growth & design >Water Crystallization in Highly Concentrated Carbohydrate-Based Systems
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Water Crystallization in Highly Concentrated Carbohydrate-Based Systems

机译：高浓缩的碳水化合物基体系中的水结晶

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摘要

Water crystallization was studied at a range of concentrations (20-60% solids) in sucrose and gum arabic systems. Increasing sucrose concentration reduced the nucleation temperature by 26 C compared to equilibrium values; crystal growth rates decreased by up 95% (from 8 x 10(-5) m/s with 40% sucrose to 4 x 10(-6) m/s with 60% w/w) for 7 degrees C supercooling, while addition of carboxymethyl cellulose (CMC)-higher viscosity-resulted in 40% slower growth rates (60% sucrose). Ice crystal shape changed from dendritic (-16 degrees C) to rounded edges (-24 degrees C) as the temperature decreased. For gum arabic, increasing supercooling (from 2 to 10 degrees C) resulted in faster growth rates (up to 3 times) for the 50% system, while the 60% solution showed rates <6 x 10(-6) m/s. Controlling water crystallization during freezing is critical in manufacturing of frozen/freeze-dried (bio)products, although little information is available on the behavior of concentrated systems (i.e., >40% solids). Despite presenting significant challenges (i.e., limited water availability and mobility), processing such concentrated systems could increase energy efficiency, as less water is processed. Results from this systematic investigation of crystal growth kinetics in concentrated carbohydrate systems demonstrate that crystal growth can be promoted despite kinetic limitations and reveal the potential to reduce energy demand during freezing/freeze-drying by processing less water.
机译：研究了在蔗糖和胶阿拉伯语系统中的一系列浓度（20-60％固体）中进行了水结晶。与平衡值相比，增加蔗糖浓度将成核温度降低26℃;晶体生长率下降95％（从8×10（-5）m / s，40％蔗糖为4×10（-6）m / s，6℃）过冷，同时添加羧甲基纤维素（CMC） - 高于粘度 - 导致40％较慢的生长速率（60％蔗糖）。随着温度降低，冰晶形状从树突状（-16摄氏度）变为圆形边缘（-24℃）。对于阿拉伯语，增加过冷（2至10℃）导致50％系统的增长率（最多3次），而60％溶液显示出速率<6×10（ - 6）m / s。控制在冷冻过程中的水结晶对于制造冷冻/冷冻干燥（BIO）产品至关重要，尽管浓缩系统的行为较少的信息（即> 40％固体）。尽管提出了重大挑战（即，有限的水可用性和移动性），但处理这种集中系统可以提高能量效率，因为加工较少的水。浓缩碳水化合物系统中晶体生长动力学的这种系统研究表明，尽管动力学限制，可以促进晶体生长，并揭示通过加工较少的水冷冻/冷冻干燥期间降低能量需求的潜力。

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  • 来源
    《Crystal growth & design》 |2019年第4期|共8页
  • 作者

    Wang Rui; Gouseti Ourania; Lopez-Quiroga Estefania; Fryer Peter J.; Bakalis Serafim;

  • 作者单位

    Univ Birmingham Sch Chem Engn Birmingham B15 2TT W Midlands England;

    Univ Nottingham Fac Engn Nottingham NG7 2RD England;

    Univ Birmingham Sch Chem Engn Birmingham B15 2TT W Midlands England;

    Univ Birmingham Sch Chem Engn Birmingham B15 2TT W Midlands England;

    Univ Birmingham Sch Chem Engn Birmingham B15 2TT W Midlands England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 晶体学;
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