Bis(Diphenylcarbamoylmethylphosphine Oxide) Ligand Containing 4, 7, 10 – Trioxatridecane Spacer: Novel Effective Extractant for Actinides and Lanthanides

A novel polydentate neutral organophosphorus ligand 1 containing two Ph₂P(O)CH₂C(O)NH- bidentate moieties connected by a 4, 7, 10 - trioxatridecane spacer through amide nitrogen atoms was synthesized and studied as an extractant for U(VI), Th(IV), and lanthanides(III) ions from HNO₃ solutions. The influence of aqueous and organic phases on the extraction efficiency was elucidated and stoichiometry of the complexes extracted was determined. Bis-CMPO ligand 1 was found to possess a higher extraction efficiency towards U(VI), Th(IV), and lanthanides(III) ions than its mono analog diphenylphosphorylacetic acid N-nonylamide 5 and bis-CMPO ligands containing a di- and a triethylene glycol spacers. The values of D_U, D_Th, and D_Ln for compound 1 are more than two orders of magnitude higher than those for its mono-CMPO analog 5.     

Extraction of rare earth elements(III) from HNO3 and HCl solutions with mixtures of carbamoylmethylphosphine oxides and picrolonic acid

Extraction of REE(III) microamounts from HNO₃ and HCl solutions with mixtures of mono- and bis-carbamoylmethylphosphine oxides with picrolonic acid in 1,2-dichloroethane was studied. The strong synergistic effect observed is due to increased hydrophobicity of the extractable complexes. The influence of the structure of carbamoylmethylphosphine oxides on the REE(III) extraction efficiency was considered, and the stoichiometry of the extractable complexes was determined. The possibility of REE(III) recovery and preconcentration from nitric acid solutions with a complexing sorbent prepared by noncovalent immobilization of the reagent mixture on the surface of a macroporous polymeric sorbent was demonstrated.     

Extraction Properties of P(O)-Modified N-Aryl-Carbamoylmethylphosphine Oxides in Nitric Acid Media

Novel polyfunctional neutral organophosphorus compounds, P(O)-modified N-aryl- carbamoylmethylphosphine oxides, Ph₂P(O)CH₂C(O)NH-(o-C₆H₄)(CH₂)_n-P(O)Ph₂ and Ph₂P(O)CH₂C(O)NH-(m-C₆H₄)(CH₂)_n-P(O)Ph₂ (n = 1,2), were synthesized and studied as extractants for U(VI), Th(IV) and Ln(III) from HNO₃ solutions. The influence of aqueous and organic phases on the extraction efficiency was elucidated and stoichiometry of the complexes extracted was determined. Introduction of an additional phosphoryl group into the phenyl substitutent at the nitrogen atom of diphenyl(N-phenylcarbamoylmethyl)phosphine oxide resulted in an increase of the efficiency of U(VI), Th(IV), Ln(III), and Re(VII) extraction.     

Pilling-Resistant Polyester Fibre

The possibility of chemically modifying polyester using a polyfunctional compound as a modifier is examined. The technology developed was used to set up manufacture of pilling-resistant fibre with characteristics that satisfy consumer requirements. It was found that incorporation of components that do not chemically react with polyester during synthesis increases the pilling resistance and dyeability of the fibre with disperse dyes. The additional use of organic acids in synthesis makes it possible to flexibly regulate the dyeability of the fibre.     

The P300 component of the auditory evoked potential in the posttraumatic vegetative state

The dynamic studies of P300 component of the acoustic evoked potential were conducted in 12 patients in posttraumatic state of the autonomic system. The amplitude and time parameters of P300 were analyzed, its spatial distribution over the cortex, and features of generation. The obtained results were compared with the normative data. Significant changes in P300 in comparison with the normal characteristics were revealed in patients with the absence of conscious mental activity. These changes were maximally expressed when the state of patients was irreversible. In case of patients' outcome from the studied state the amplitude-temporal and topographic response characteristics tended to normalization but did not reach it completely. The obtained results allow us to consider the P300 component as one of the most informative indices in consciousness recovery after severe brain injury.     

Electroosmosis in layered porous systems

Regularities of electroosmosis in bilayer diaphragms are investigated. Formulas describing the change of rate of the process in comparison with electroosmosis on a homogeneous diaphragm are obtained. The calculation results are confirmed by experimental data.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 20, No. 1, pp. 56–62, January, 1971.     

Monitoring of the commercial operation of reforming catalysts using a computer simulation system

A methodology of constructing nonstationary kinetic models of multicomponent catalytic processes of hydrocarbon conversion on platinum-containing catalysts was developed. Their kinetic and technological parameters in industrial catalytic reforming were estimated. The simulation system in gasoline production allows for the testing and choosing of an optimum catalyst depending on the composition of the processed hydrocarbon raw materials. The developed testing technique is based on the processing of the results of the commercial operation of platinum-containing reforming catalysts using the computer simulation system. It allows the estimation of kinetic parameters, the prediction of selectivity, and raw cycle duration after catalyst regeneration under conditions of commercial operation, taking into account the reactivity of hydrocarbons.     

Extraction of U(VI), Th(IV), and REE(III) from nitric acid solutions with (N,N-dialkylcarbamoylmethyl)- and (N-alkylcarbamoylmethyl)phenylphosphinic acids

Extraction of microamounts of U(VI), Th(IV), and REE(III) from HNO₃ solutions with solutions of (N,N-dialkylcarbamoylmethyl)- and (N-alkylcarbamoylmethyl)phenylphosphinic acids in dichloroethane was studied. The stoichiometry of the extractable complexes was determined, and the influence exerted on the efficiency of the U(VI), Th(IV), and REE(III) recovery into the organic phase by the extractant structure, organic diluent, and aqueous phase composition was examined. The possibility of selective recovery and concentration of U(VI), Th(IV), and REE(III) from nitric acid solutions with a complexing sorbent prepared by noncovalent immobilization of the examined polyfunctional organophosphorus acids on a macroporous polymeric matrix was demonstrated.