Effects of linear flow velocity and residence time on the retention of non-polar aqueous organic analytes by cartridges of tenax-gc

1982 ◽  
Vol 245 (1) ◽  
pp. 31-43 ◽  
Author(s):  
James F. Pankow ◽  
Lorne M. Isabelle ◽  
Toni J. Kristensen
Keyword(s):  
Flow Velocity ◽  
Residence Time ◽  
Linear Flow ◽  
Organic Analytes ◽  
Tenax Gc ◽  
Linear Flow Velocity

IV. An Improved Separation Method for Twenty two Compounds Related to Purine and 6-Thiopurine Metabolism Using High-Pressure Liquid Cation-Exchange Chromatography

1977 ◽  
Vol 32 (11-12) ◽  
pp. 905-907 ◽  
Author(s):  
Hans-Joachim Breter
Keyword(s):  
High Pressure ◽  
Cation Exchange ◽  
Flow Velocity ◽  
Exchange Resin ◽  
Exchange Chromatography ◽  
Separation Method ◽  
Cation Exchange Chromatography ◽  
Improved Method ◽  
Linear Flow ◽  
Linear Flow Velocity

Abstract An improved method is described for the separation of 22 compounds normally related to purine and 6-thiopurine metabolism in biological materials using high-pressure liquid cation-exchange chromatography on strongly acidic exchange resin. The column (0.18 × 100 cm) is eluted with 0.4 ᴍ ammonium formate, pH 4.6, at a linear flow velocity of 5.2 cm · min-1 at 50 °C. The elution volumes of sulphate anions, allopurinol, 6-thioxanthine, adenine, adenosine, and guanosine are demonstrated additionally to further 16 purine and 6-thiopurine compounds.

scholarly journals Study on the Effectiveness of Simultaneous Recovery and Concentration of 1-Ethyl-3-methylimidazolium Chloride Ionic Liquid by Electrodialysis with Heterogeneous Ion-Exchange Membranes

2021 ◽  
Vol 22 (23) ◽  
pp. 13014
Author(s):  
Dorota Babilas ◽  
Anna Kowalik-Klimczak ◽  
Piotr Dydo
Keyword(s):  
Flow Velocity ◽  
Volume Ratio ◽  
Feed Solution ◽  
Operational Parameters ◽  
Recovery Method ◽  
Linear Flow ◽  
Extensive Range ◽  
Concentration Degree ◽  
Efficient Recovery ◽  
Linear Flow Velocity

Due to the extensive range of ionic liquids (ILs) used in industry, an efficient recovery method is needed. In this study, the effectiveness of a simultaneous concentration and recovery method was investigated for 1-ethyl-3-methylimidazolium chloride ([Emim]Cl), an IL that was recovered using electrodialysis (ED). The optimal operational parameters for electrodialytic recovery were determined empirically. The variables that were investigated included the concentration of IL, applied voltage, linear flow velocity and the diluate-to-concentrate volume ratio. The recovery of [Emim]Cl, the concentration degree, the [Emim]Cl flux across membranes, the current efficiency, as well as the energy consumption were determined. The results of the experiments confirmed that [Emim]Cl concentration and recovery can be achieved using ED. The highest ED efficiency was obtained when a 2 V electric potential per one membrane pair was applied, using a 2 cm/s linear flow velocity, and by adjusting to 0.2 M IL in the feed solution. By using ED, a 2.35-fold concentration of [Emim]Cl with a recovery of 90.4% could be achieved when the diluate-to-concentrate volume ratio was 2. On the other hand, a 3.35-fold concentration of [Emim]Cl with a recovery of 81.7% could be obtained when the diluate-to-concentrate volume ratio was increased to 5.

scholarly journals Flow velocity and cell pair number effect on current efficiency in plating wastewater treatment through electrodialysis

2020 ◽  
Vol 26 (2) ◽  
pp. 190502-0
Author(s):  
Kyung Jin Min ◽  
Joo Hyeong Kim ◽  
Eun Joo Oh ◽  
Jun Hee Ryu ◽  
Ki Young Park
Keyword(s):  
Heavy Metals ◽  
Current Efficiency ◽  
Flow Velocity ◽  
Removal Efficiency ◽  
Limiting Current ◽  
Toxic Substances ◽  
Linear Flow ◽  
Design Elements ◽  
Cell Pair ◽  
Linear Flow Velocity

Electrodialysis has been used for treating toxic substances such as heavy metals and minimizing secondary environmental pollution problems effectively. However, electrodialysis depends on the operating parameters as well as fluid dynamics and electrical properties. This study provides design elements for the treatment of heavy metal-containing wastewater by electrodialysis. We found that the limiting current density (LCD) is proportional but not completely linear to the diluate concentration over a threshold value. In contrast, it is linear to the linear flow velocity for the whole range. As the number of cell pairs increases, because linear flow velocity and LCD increase, the removal efficiency of heavy metals also increases. Therefore, for highly concentrated wastewater, increasing the linear flow velocity, the applied voltage, and the number of cell pairs can effectively improve removal efficiency. It was found that the current efficiency is as low as 17% when the removal efficiency of heavy metals exceeds 95%. Thus, it is necessary to select an operating range that optimizes the operating and initial investment costs for the effective removal of heavy metals using electrodialysis.

Influence of linear flow velocity and ion concentration on limiting current density during electrodialysis

2020 ◽  
Vol 175 ◽  
pp. 334-340
Author(s):  
Kyung Jin Min ◽  
Eun Joo Oh ◽  
Gabin Kim ◽  
Joo Hyeong Kim ◽  
Jun Hee Ryu ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Current Density ◽  
Ion Concentration ◽  
Limiting Current ◽  
Linear Flow ◽  
Limiting Current Density ◽  
Linear Flow Velocity
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