I am a researcher in the field of Radiochemistry, Physical chemistry (Separation science, solvent extraction, liquid membrane separation).During the 1973-1989 was active in the undergraund Jewish movement in the USSR. Three years in in the Soviet GULAG.Worked (in USSR) on the nuclear production interprise (nuclear arms production). In Israel: in separation science and Technology.Resigned in 2002.
This chapter consists of the literature review devoted to the concepts used in the development of... more This chapter consists of the literature review devoted to the concepts used in the development of the competitive complexation/solvation theory (CCST). These are as follows: 1) Complexation through hydrogen bonding and proton transfer, chemical quantum mechanics;
Publisher Summary The chapter gives an overview of the chemistry of metal solvent extraction; it ... more Publisher Summary The chapter gives an overview of the chemistry of metal solvent extraction; it provides the factors underlying the strength of metal extractant interactions, their influence for different metals and extracting reagents, and other parameters of complexation that are briefly reviewed and discussed. Solvent extraction of metals is an important technology in hydrometallurgical industry, analytical separations, and liquid waste treatment. Metal ions, cations, and anions are extracted from an aqueous phase into an organic phase through reversible chemical reactions, forming organic-soluble neutral complexes. Extractant usually has very low solubility in an aqueous phase, but interacts with metal ions and obtains high solubility in an organic phase complex. So, extraction is described by a heterogeneous chemical reaction on either side of the aqueous organic interface to the final equilibrium concentrations of the reaction product. In addition, the chemical reaction of solutes with organic compounds (termed as extractants, or reagents), dissolved in the organic solvent (diluent), is accompanied by the distribution of product complexes between two immiscible phases. The extent of complexation for any solute–ligand system is defined by equilibrium constant, which is termed stability or formation constant for metal–ligand interaction. Furthermore, the chapter explains metal extraction by anion exchangers and many equations.
The competitive complexation/solvation theory is introduced to explain the mechanisms of solvent ... more The competitive complexation/solvation theory is introduced to explain the mechanisms of solvent extraction of metals by acidic extractants.
Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studi... more Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studied, using the two liquid membrane systems: Hybrid Liquid Membrane (HLM) and Aqueous Hybrid Liquid Membrane (AHLM). Monothiophosphinic acid (Cyanex 302) in kerosene (for the HLM) and Polyvinylsulfonic acid (PVSA) aqueous solution (for the AHLM) were used as a liquid membrane (LM), separated from the feed and strip streams by neutral or cation-exchange membranes. On application of the HLM separation system, the permeation from the feed to the strip phase followed the selectivity sequence: Zn >> Cd > Cu with all types of membranes used. Results show that the selective separation of Cd and Zn from the WPA may be achieved by the HLM with cation-exchange membranes, using a single set-up installation at continuous processing. Copper is accumulated in the Cyanex 302, poisoning the carrier. So, this carrier and HCl as a strip solution can not be recommended for the HLM processing of WPA....
... VS Karasev, VS Kislik, GF Shred, and RV Grebennikov ... Curve 1 has eight well-resolved peaks... more ... VS Karasev, VS Kislik, GF Shred, and RV Grebennikov ... Curve 1 has eight well-resolved peaks (denoted by Roman numerals), enabling one to determine with sufficient accuracy the charac-teristic temperature of the corresponding stage of helium evolution. ...
This chapter consists of the literature review devoted to the concepts used in the development of... more This chapter consists of the literature review devoted to the concepts used in the development of the competitive complexation/solvation theory (CCST). These are as follows: 1) Complexation through hydrogen bonding and proton transfer, chemical quantum mechanics;
Publisher Summary The chapter gives an overview of the chemistry of metal solvent extraction; it ... more Publisher Summary The chapter gives an overview of the chemistry of metal solvent extraction; it provides the factors underlying the strength of metal extractant interactions, their influence for different metals and extracting reagents, and other parameters of complexation that are briefly reviewed and discussed. Solvent extraction of metals is an important technology in hydrometallurgical industry, analytical separations, and liquid waste treatment. Metal ions, cations, and anions are extracted from an aqueous phase into an organic phase through reversible chemical reactions, forming organic-soluble neutral complexes. Extractant usually has very low solubility in an aqueous phase, but interacts with metal ions and obtains high solubility in an organic phase complex. So, extraction is described by a heterogeneous chemical reaction on either side of the aqueous organic interface to the final equilibrium concentrations of the reaction product. In addition, the chemical reaction of solutes with organic compounds (termed as extractants, or reagents), dissolved in the organic solvent (diluent), is accompanied by the distribution of product complexes between two immiscible phases. The extent of complexation for any solute–ligand system is defined by equilibrium constant, which is termed stability or formation constant for metal–ligand interaction. Furthermore, the chapter explains metal extraction by anion exchangers and many equations.
The competitive complexation/solvation theory is introduced to explain the mechanisms of solvent ... more The competitive complexation/solvation theory is introduced to explain the mechanisms of solvent extraction of metals by acidic extractants.
Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studi... more Selective removal of heavy metal ions from industrial wet-process phosphoric acid (WPA) was studied, using the two liquid membrane systems: Hybrid Liquid Membrane (HLM) and Aqueous Hybrid Liquid Membrane (AHLM). Monothiophosphinic acid (Cyanex 302) in kerosene (for the HLM) and Polyvinylsulfonic acid (PVSA) aqueous solution (for the AHLM) were used as a liquid membrane (LM), separated from the feed and strip streams by neutral or cation-exchange membranes. On application of the HLM separation system, the permeation from the feed to the strip phase followed the selectivity sequence: Zn >> Cd > Cu with all types of membranes used. Results show that the selective separation of Cd and Zn from the WPA may be achieved by the HLM with cation-exchange membranes, using a single set-up installation at continuous processing. Copper is accumulated in the Cyanex 302, poisoning the carrier. So, this carrier and HCl as a strip solution can not be recommended for the HLM processing of WPA....
... VS Karasev, VS Kislik, GF Shred, and RV Grebennikov ... Curve 1 has eight well-resolved peaks... more ... VS Karasev, VS Kislik, GF Shred, and RV Grebennikov ... Curve 1 has eight well-resolved peaks (denoted by Roman numerals), enabling one to determine with sufficient accuracy the charac-teristic temperature of the corresponding stage of helium evolution. ...
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