Extraction Kinetics and Mechanism of La(III) by P204-Kerosine from Phosphoric Acid

The extraction kinetics and mechanism of La (III) by P204-kerosine from phosphoric acid were investigated by constant interfacial cell with laminar flow. The effects of stirring speed, temperature, specific interface area on extraction rate were studied. The results indicated that a plateau region is appeared at the stirring speed of over 115r/min. The extraction apparent activation energy was calculated to be-13.40kJ/mol and the extraction process is controlled by a mixed mechanism of diffusion and chemical reaction. The rate equation of extraction was deduced. Under conditions of 25°C and interfacial area 19.64cm2, the extraction rate constant was 2.08×10-6 m·s-1·. Through the derivation of the reaction mechanism the reaction zone is at the liquid-liquid interface.

Download Full-text

The kinetics and mechanism of solvent extraction of Pr(iii) from chloride medium in the presence of two complexing agents with di-(2-ethylhexyl) phosphoric acid

RSC Advances ◽

10.1039/c5ra07113e ◽

2015 ◽

Vol 5 (60) ◽

pp. 48659-48664 ◽

Cited By ~ 12

Author(s):

Shao-Hua Yin ◽

Shi-Wei Li ◽

Jin-Hui Peng ◽

Li-Bo Zhang

Keyword(s):

Lactic Acid ◽

Citric Acid ◽

Solvent Extraction ◽

Phosphoric Acid ◽

Interfacial Area ◽

Kinetics And Mechanism ◽

Complexing Agents ◽

Extraction Kinetics ◽

Chloride Medium ◽

Kinetics Of

The extraction kinetics of Pr(iii) from chloride medium containing two complexing agents lactic acid (HLac) and citric acid (H3cit) with di-(2-ethylhexyl)phosphoric acid (D2EHPA, H2A2) have been investigated by constant interfacial area cell with lamina flow.

Download Full-text

Extraction Kinetics of Cerium(III) from Chloride Medium by Di-(2-Ethylhexyl)phosphoric Acid in the Presence of Acetic Acid Using a Constant Interfacial Area Cell with Laminar ﬂow

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.482-484.2204 ◽

2012 ◽

Vol 482-484 ◽

pp. 2204-2209 ◽

Cited By ~ 1

Author(s):

Hong Tao Chang ◽

Mei Li ◽

Zhao Gang Liu ◽

Yan Hong Hu ◽

Fu Shun Zhang

Keyword(s):

Acetic Acid ◽

Laminar Flow ◽

Phosphoric Acid ◽

Interfacial Area ◽

Extraction Process ◽

Effect Of Temperature ◽

Complexing Agent ◽

Extraction Kinetics ◽

Specific Interfacial Area ◽

Diffusion Controlled

The Ce(III) extraction kinetics with di-(2-ethylhexyl)phosphoric acid (D2EHPA) in the presence of a complexing agent acetic acid(HAc) has been investigated using constant interfacial cell with laminar ﬂow. The kinetics mechanism and extraction rate equation were achieved by the studies on the effect of stirring rate, temperature and specific interfacial area on the rate of extraction. The effect of temperature on the kinetics was analyzed, the value of the apparent activation energy was calculated as 11.96 kJ/mol, and it was found that the extraction process was a diffusion-controlled kinetics regime.

Download Full-text

Kinetics analysis of the forward extraction of cerium(III) by D2EHPA from chloride medium in the presence of two complexing agents using a constant interfacial area cell with laminar flow

Green Processing and Synthesis ◽

10.1515/gps-2017-0035 ◽

2018 ◽

Vol 7 (4) ◽

pp. 380-386 ◽

Cited By ~ 1

Author(s):

Jiannan Pei ◽

Junwen Zhou ◽

Feng Jiang ◽

Kaihua Chen ◽

Shaohua Yin ◽

...

Keyword(s):

Laminar Flow ◽

Interfacial Reaction ◽

Rate Equation ◽

Ph Value ◽

Kinetic Studies ◽

Interfacial Area ◽

Extraction Process ◽

Extraction Rate ◽

Complexing Agents ◽

Specific Interfacial Area

Abstract The kinetic studies performed on the forward extract of cerium(III) from chloride solution with the complex agents, citric acid (H3Cit) and lactic acid (HLac) in the presence of di-(2-ethylhexyl)phosphoric acid (D2EHPA, H2A2) have been investigated using a constant interfacial area cell with laminar flow. The effects of stirring speed, temperature, and specific interfacial area on the extraction rate are discussed separately, and the results show that the extraction process is a diffusion-controlled kinetics process with an interfacial reaction. Studies on the effect of pH value and H2A2 concentration on the extraction rate are used to obtain the rate equation. The rate-controlling step is also suggested by the predictions derived from the interfacial reaction models, and the rate equation obtained by the kinetic model is consistent with that obtained by the experimental results. The information on the extraction kinetics in this extraction system will provide some knowledge of its application.

Download Full-text

Study on Mass-Transfer Kinetics of Nd by 2-Ethylhexylphosphonic Acid Mono-(2-Ehylhexyl) Ester in the Presence of a Complexing Agent

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.461.647 ◽

2012 ◽

Vol 461 ◽

pp. 647-651

Author(s):

Hong Tao Chang ◽

Mei Li ◽

Zhao Gang Liu ◽

Yan Hong Hu ◽

Fu Shun Zhang

Keyword(s):

Interfacial Area ◽

Extraction Process ◽

Effect Of Temperature ◽

Complexing Agent ◽

Extraction Kinetics ◽

Specific Interfacial Area ◽

Diffusion Controlled ◽

Mass Transfer Kinetics ◽

Kinetics Of ◽

Rate Of Extraction

The Nd(III) extraction kinetics by 2-ethylhexylphosphonic acid mono-(2-ethylhexyl) ester (HEH/EHP) in the presence of a complexing agent acetic acid(HAc) has been investigated using constant interfacial cell. The kinetics mechanism and extraction rate equation were achieved by the studies on the effect of stirring rate, temperature and specific interfacial area on the rate of extraction. The effect of temperature on the kinetics was analyzed, the value of the apparent activation energy was calculated as 9.24 kJ/mol, and it was found that the extraction process was a diffusion-controlled kinetics process.

Download Full-text