CRYSTALLIZATION | Zone Refining

ω-phase particles formed in β-titanium alloys (bcc structure) act important roles to their mechanical properties such as ductility and hardness. About the ductility, fine ω-phase particles in β–titanium alloys improve the ductility, because ω-phase crystals becomes nucleation sites of α-phase and it is well known that (β+α) duplex alloys have higher ductility. In the present study, the formation sites and the formation mechanism of ω-phase crystals due to external stress and aging are investigated using the conventional and high resolution electron microscopy.A β-titanium alloy (Til5Mo5Zr) was supplied by Kobe Steel Co., and a single crystal was prepared by a zone refining method. Plates with {110} surface were cut from the crystal and were pressured hydrostatically, and stressed by rolling and tensile testing. Specimens for aging with tensile stress were also prepared from Ti20Mo polycrystals. TEM specimens from these specimens were prepared by a twin-jet electron-polishing machine. A JEM 4000EX electron microscope operated at 400k V was used for taking dark field and HREM images.

Download Full-text

Purification of alkaloids from Catharanthus roseus by pH-zone refining centrifugal partition chromatography: process intensification and scale up

Planta Medica ◽

10.1055/s-0036-1596139 ◽

2016 ◽

Vol 81 (S 01) ◽

pp. S1-S381

Author(s):

S Chollet ◽

A Kotland ◽

JM Autret ◽

G Calmels ◽

C Diard ◽

...

Keyword(s):

Catharanthus Roseus ◽

Scale Up ◽

Process Intensification ◽

Partition Chromatography ◽

Centrifugal Partition Chromatography ◽

Zone Refining

Download Full-text

Purification of alkaloids from Catharanthus roseus by pH-Zone Refining Centrifugal Partition Chromatography: process intensification and scale up

10.1055/s-0037-1608276 ◽

2017 ◽

Author(s):

A Kotland ◽

S Chollet ◽

JM Autret ◽

G Calmels ◽

C Diard ◽

...

Keyword(s):

Catharanthus Roseus ◽

Scale Up ◽

Process Intensification ◽

Partition Chromatography ◽

Centrifugal Partition Chromatography ◽

Zone Refining

Download Full-text

Preparative and scaled‐up separation of high‐purity α‐linolenic acid from perilla seed oil by conventional and pH‐zone refining counter current chromatography

Journal of Separation Science ◽

10.1002/jssc.201900189 ◽

2019 ◽

Vol 42 (14) ◽

pp. 2360-2370

Author(s):

Tian Han ◽

Guang Yang ◽

Xueli Cao ◽

Haoze Li ◽

Hairun Pei ◽

...

Keyword(s):

Linolenic Acid ◽

High Purity ◽

Seed Oil ◽

Zone Refining ◽

Counter Current ◽

Perilla Seed

Download Full-text

Research Status of High-Purity Metals Prepared by Zone Refining

Materials ◽

10.3390/ma14082064 ◽

2021 ◽

Vol 14 (8) ◽

pp. 2064

Author(s):

Liang Yu ◽

Xiaoan Kang ◽

Luona Chen ◽

Kun Luo ◽

Yanli Jiang ◽

...

Keyword(s):

Parameter Optimization ◽

Future Development ◽

High Purity ◽

Impurity Content ◽

Physical Method ◽

Zone Refining ◽

Relevant Research ◽

Research Status ◽

Analysis Methods ◽

Theoretical Foundations

The zone refining method is a physical method for effectively purifying metals. Increasing yield and reducing impurity content have always been the focus of its research. This article systematically summarizes the relevant research on the production of high-purity metals by zone refining, including mechanisms, parameter optimization, zone refining types, analysis methods, limitations, and future development directions, and it provides relevant theoretical foundations for the production of high-purity metals as well.

Download Full-text