Kinetics of Isoprene Polymerization in the Presence of the Catalytic System NdCl3 · nCH3CH(OH)CH3-Al(i-C4H9)3-Piperylene

Tereshchenko, K. A.; Ulitin, N. V.; Shiyan, D. A.; Almetova, G. F.; Захарова, Е. М.; Насыров, И. Ш.; Захаров, В. П.

doi:10.1134/s1990793119010299

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main impurities in the product were Ca, Mg, Al, and Si, and the purity of NdCl 3 ·6H 2 O was 98.1%. NdCl 3 ·6H 2 O can be used as a raw material to prepare the Nd metal, petroleum catalysts, glass colorants, and magnetic materials after vacuum dehydration. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…Therefore, the Nd was recovered from the HCl acid leaching solution in the form of NdCl O can be used as a raw material to prepare the Nd metal, petroleum catalysts, glass colorants, and magnetic materials after vacuum dehydration. 55,56 A new approach was proposed in this study to recover Nd from the Nd 2 O 3 -containing slag (Figure 11), which can be used for the recycling of REEs from REE wastes, including spent NdFeB magnets (Nd is oxidized as Nd 2 O 3 and is transferred from the spent NdFeB magnets to slag to form Nd 2 O 3 -containing slag). Low-purity Si was used as a reductant to recover Nd from the Nd 2 O 3 -containing slag to form Si−Nd alloy.…”

Section: And Chlorination Of Reesmentioning

confidence: 99%

See 1 more Smart Citation

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Lei

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The extraction of rare earth elements (REEs) from rare earth oxide slag is a major challenge of recycling REEs from REE-containing wastes using pyrometallurgical approaches, especially the recycling of Nd from spent NdFeB permanent magnets. In this study, a novel and effective approach is proposed for extracting Nd from Nd 2 O 3 -containing slag. First, low-purity Si (99.2%) was used as a reductant to extract Nd from Nd 2 O 3containing slag to prepare a bulk Si−Nd alloy. The bulk Si−Nd alloy represents one of the final products and achieves the purpose of Nd recycling because of its wide applications; alternatively, the bulk Si−Nd alloy can be further separated into Si powder and Ndcontaining HCl solution by HCl acid leaching. Thereafter, three methods can be used to recover Nd from the Nd-containing HCl solution: (1) NH 3 •H 2 O can be used to precipitate Nd 3+ as NdOCl hydrate sediment, which is roasted to obtain high-purity NdOCl (99.0%); (2) HF can be used to precipitate Nd 3+ as NdF 3 (97.0%); or (3) NdCl 3 •6H 2 O (98.1%) can be obtained after completely distilling the Nd-containing HCl solution. This new technology not only permits the recovery of Nd from the Nd 2 O 3 -containing slag but also increases the purity of Si from 99.2 to 99.997%.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: And Chlorination Of Reesmentioning

confidence: 99%

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Lei

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

Stereoregularity of Polyisoprene Obtained in the Presence of a Catalyst Based on Gadolinium Chloride

et al. 2022

View full text Add to dashboard Cite

Evaluating the Efficiency of the Tube Turbulent Apparatus Influence on Kinetics of Polymer Production Processes

Miftakhov,

Mustafina,

Morozkin

et al. 2023

Engineering Technologies and Systems

View full text Add to dashboard Cite

Introduction. Because of high demand for polymer products, there are constantly modernized the technological aspects of their production, a huge share of which is based on the use of microheterogeneous catalytic systems. Physicochemical properties of polymer products can be improved through targeted hydrodynamic effect in turbulent flows. The study of physicochemical patterns of polymer product synthesis in the presence of modified catalytic systems is of great interest. Aim of the Article. The article is aimed at evaluating the efficiency of hydrodynamic influence in turbulent flows on the type of catalyst heterogeneity and the kinetics of polymer production processes. Materials and Methods. In the study of polymer synthesis processes, there is used a simulation approach to the system model description that is based on the idea of reproducing various scenarios of uninterrupted production and conducting the necessary empirical analysis. Parallel programming and cloud computing technologies are used in simulation modeling to increase computational speed. Results. A methodology for solving inverse problems has been developed to determine the influence of external factors on the kinetic activity and heterogeneity of active centers on the basis of known physicochemical information. The use of simulation modeling with the application of cloud computing technology makes it possible to unambiguously determine the type of kinetic heterogeneity in the conditions of averaging the reactive capacity of active centers. Discussion and Conclusion. Approbation of the new simulation approach to the solution of the inverse problem allowed evaluating the efficiency of the influence of the tube turbulent apparatus on the kinetics of producing polyisoprene in the presence of titanium catalyst and identifying the presence of two active centers: type ATi − lnM = 13.4, type BTi − lnM = 11.7, while the proportion of active centers type ATi is 0.91; type BTi – 0.09. Based on the data obtained, it becomes possible to formulate and solve inverse problems of identifying kinetic parameters for further model description of the system.

show abstract

Kinetics of Isoprene Polymerization in the Presence of the Catalytic System NdCl3 · nCH3CH(OH)CH3-Al(i-C4H9)3-Piperylene

Cited by 3 publications

References 8 publications

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Stereoregularity of Polyisoprene Obtained in the Presence of a Catalyst Based on Gadolinium Chloride

Evaluating the Efficiency of the Tube Turbulent Apparatus Influence on Kinetics of Polymer Production Processes

Contact Info

Product

Resources

About

Kinetics of Isoprene Polymerization in the Presence of the Catalytic System NdCl3 · nCH3CH(OH)CH3-Al(i-C4H9)3-Piperylene

Cited by 3 publications

References 8 publications

Novel Approach for the Simultaneous Recovery of Nd from Nd2O3-Containing Slag and the Preparation of High-Purity Si

Novel Approach for the Simultaneous Recovery of Nd from Nd2O3-Containing Slag and the Preparation of High-Purity Si

Stereoregularity of Polyisoprene Obtained in the Presence of a Catalyst Based on Gadolinium Chloride

Evaluating the Efficiency of the Tube Turbulent Apparatus Influence on Kinetics of Polymer Production Processes

Contact Info

Product

Resources

About

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si