A novel method for determination of particle size distribution in-process

A novel method for determination of particle size distribution in-process
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一种测定过程中粒度分布的新方法

DOI:
10.1117/12.835099
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发表时间:
2009
期刊:
--
影响因子:
--
通讯作者:
Salaoru T
Salaoru T
中科院分区:
--
文献类型:
--
作者:
Salaoru T

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制药和精细化工行业与制造高附加值的特种产品密切相关,通常以固体形式存在。固体粒度的在线测量对于产品性能的可靠控制至关重要。已建立的技术,如激光衍射或光谱消光,在测量典型制造流时需要稀释工艺悬浮液,因为它们的浓度很高。为了便于测量而进行的稀释会导致颗粒大小和形状的变化,特别是在结晶等生产过程中。在光谱消光中,测量悬浮液对光的散射和吸收程度。然而,对于浓悬浮液,由于多重散射和粒子间相互作用的影响,光消测量的解释是困难的,并且在较高浓度下,光消基本上是全部的,因此该技术不再适用。同时,色散引起的散射也会引起相的变化,从而影响悬浮液有效折射率的实际分量,而有效折射率是粒径和粒子及分散剂折射率的函数。在这项工作中,开发了一种新的原型仪器,通过测量全内反射开始附近入射角处的悬浮液折射率来测量浓缩悬浮液中的粒径分布。使用这种技术,光束不会穿过被测量的悬浮液,因此悬浮液浊度不会影响测量。
The pharmaceutical and fine chemicals industries are strongly concerned with the manufacture of high value-added speciality products, often in solid form. On-line measurement of solid particle size is vital for reliable control of product properties. The established techniques, such as laser diffraction or spectral extinction, require dilution of the process suspension when measuring from typical manufacturing streams because of their high concentration. Dilution to facilitate measurement can result in changes of both size and form of particles, especially during production processes such as crystallisation. In spectral extinction, the degree of light scattering and absorption by a suspension is measured. However, for concentrated suspensions the interpretation of light extinction measurements is difficult because of multiple scattering and inter-particle interaction effects and at higher concentrations extinction is essentially total so the technique can no longer be applied. At the same time, scattering by a dispersion also causes a change of phase which affects the real component of the suspension's effective refractive index which is a function of particle size and particle and dispersant refractive indices. In this work, a novel prototype instrument has been developed to measure particle size distribution in concentrated suspensions in-process by measuring suspension refractive index at incidence angles near the onset of total internal reflection. Using this technique, the light beam does not pass through the suspension being measured so suspension turbidity does not impair the measurement.
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