Kinetic Study of the Reaction between Tert-butyl Hydrazine and Nitrous Acid

The kinetic study of the reaction between tert-butyl hydrazine(TBH)and nitrous acid in nitric acid system is performed by spectrophotometry. The effect of some factors such as the concentration of TBH, the concentration of nitric acid, ionic strength, temperature and the     

N，N,N‘,N’—tetrabutylmalonamide as a new extractant for extraction of nitric acid and uranium（VI）

N,N,N‘,N‘-tetrabutylmalonamide(TBMA) is synthesized and used for extraction of uranyl(Ⅱ） ion from nitric acid media in a diluent composed of 50% 1,2,4-trimethyl benzene (TMB) and 50% kerosene(OK),The effects of nitric acid concentration,extractant concentration,temperature,slating-out agent (LiNO3) and back extraction on distribution coefficients of uranyl(Ⅱ） ion have been studied.The extraction of nitric acid is also studied.The main adduct of TBMA and HNO3 is HNO3.TBMA,and there are more than two kinds of adducts in 3.0mol/L nitric acid solutions,such as HNO3.TBMA,(HNO3)2,TBMA and (NHO3)3.TBMA.The complex formation of uranyl(Ⅱ） ion,nitrate ion and TBMA(1:2:1) as extracted species is further confirmed by IR spectra of the saturated extraction of uranyl(Ⅱ） ion with TBMA,and the values of thermodynamic parameters have also been calculated.     

Kinetic Studies on Reactions Between Monomethylhydrazine and Fe~(3 ) as Well as N,N-Dimethylhydroxylamine and Fe~(3 ) by Measuring Potential of Fe~(3 )/Fe~(2 )

The kinetic studies on the reactions between monomethyldrazine and Fe3 as well as N,N-dimethyl-hydroxylamine and Fe3 in nitric acid system are performed by measuring open-circuit potential of Fe3 /     

Study on Extraction Behavior of Am（Ⅲ） and Ln（Ⅲ） With iPr-BTP

By using 30% n-octanol/n-dodecane as diluent, the extraction behavior of Am（Ⅲ） and lanthanides（Ⅲ） from nitric acid solution was studied with 2,6-bis-（5,6-di-i-propyl-1,2,4-triazin- 3-yl）-pyridine （iPr-BTP）. The effect of some parameters, such as the concentration of nitric acid,     

Study on Extraction of Pu（Ⅳ） by Tri-iso-Amyl Phosphate

The extraction performance of Pu（Ⅳ） with tri-iso-amyl phosphate （TiAP） were studied. The effects of the concentration of nitric acid and the ratio of phase on the extraction efficiency of Pu（Ⅳ）, and on the formation of second organic phase were investigated. The experimental results indicate that the distribution ratios of Pu（Ⅳ） increase obviously with increasing aqueous nitric acid concentration,     

Studies on the extraction of uranium (VI) by bis (hexylsulfinyl) ethane

The extraction of uranium (VI) by bis(hexylsulfinyl)ethane(BHxSE) in nitric acid aqueous solution has been investigated. The extracted species appeared to be UO2(NO3)2-2BHxSE. Influences of nitric acid concentration, NaNO3 concentration, Na2C2O4 concentration and temperature on the extraction equilibrium were investigated and the thermodynamic functions of the extraction reaction were obtained.     

Alpha radiolysis of nitric acid aqueous solution irradiated by 238Pu source

Alpha radiolysis of nitric acid aqueous solution by a ~(238)Pu source is investigated experimentally and theoretically.The time dependence of the nitrous acid yield on dose rate,nitric acid concentration,and nitrate ion concentration is studied.A novel kinetic model for the α-radiolysis of nitric acid aqueous solution is established,by considering the direct and indirect effects.The simulation results agree well with the experimental data,indicating the validity of our model to treat the reaction paths for generation and consumption of nitrous acid.It is shown that the redox reactions involving Pu cannot be neglected in theα-radiolysis of the solution.The results provide a better understanding of the α-ray radiolysis of aqueous nitric acid.     

Synthesis of N,N＇-dimethyl-N,N＇-didecyl-3-oxa-diglycolamide for extraction of lanthanides

A novel extractant,N,N'-dimethyl-N,N'-didecyl-3-oxa-diglycolamide(DMDDDGA),was designed and synthesized for extraction of lanthanides in the nuclear fuel reprocessing.The extraction behaviors of Gd,Dy,Er and Ho from nitric acid solution were investigated using DMDDDGA in chloroform.The effects of nitric acid concentration,extractant concentration,and temperature on the extraction were investigated.The distribution ratio of lanthanides increases with concentrations of the extractant and nitric acid,but decreases with increasing temperature,which indicates that the extraction process is exothermic.FT-IR spectra indicated that the C=0 in DMDDDGA is coordinated with metal ion in the extracted species and the stoichiometries of lanthanides(Ⅲ)complex are Gd(NO_3)_3·3DMDDDGA,Dy(NO_3)_3·4DMDDDGA,Er(NO_3)_3·4DMDDDGA,and Ho(NO_3)_3·4DMDDDGA.     

Preparation of N,N‘－diacylpiperazine and its extraction property for U（VI）

A novel extractant,N,N‘-diacylpiperazine(DAPEZ),was synthesized and characterized for the first time.Its extraction property for U(VI)from aqueous nitric acid media has been studied.The effects of concentration of nitric acid and extractant on the distribution ratio were examined and the extraction mechanism were discussed.     

Study on Extraction of Pu(Ⅳ) by Tri-iso-Amyl Phosphate

The extraction performance of Pu(Ⅳ) with tri-iso-amyl phosphate (TiAP) were studied. The effects of the concentration of nitric acid and the ratio of phase on the extraction efficiency of Pu(Ⅳ), and on the     

Solvent extraction of uranium(VI) and europium(III) from nitrate media by picolinamide

The solvent extraction of uranium(VI) and europium(III) from nitric acid solution was studied with pi- colinamide dissolved in ethylene dichloride. The distribution ratios of U(VI) and Eu(III) as a function of aqueous HNO3 concentration , extractant concentration in organic phase and temperature as well as the salting-out agent con- centration have been measured. The experiment results show that picolinamide has higher extractability for U(VI) than for Eu(III). The composi…     

Solvent extraction of uranium（VI） and thorium（IV） in nitric acid solution by N,N,N‘,N’—tetrabutyladipicamide

N,N,N‘N‘-tetrabutyladipicamide(TBAA) has been synthesized,and applied to the extraction of U(VI) and Th(IV) from nitric acid solutions in a diluent composed of 0.50 volume fraction 1,2,4-trimethyl benzene (TMA) and 0.50 volume fraction kerosene(OK),The effects of the aueous nitric acid concentration,extractant concentration,slating-out agent (LiNO3) and temperature on extraction ability of TBAA for U(VI) and Th(IV) have been studied.Back Extraction of U(VI) and Th (IV) from organic phases were performed by dilute nitric acid.The compositions of extracted complexes,equilibrium constants and enthalpies of extraction reactions have also been estimated.The IR spectra of extraction of U(VI) and Th(IV) have been studied.     

The n-Octylododecylsulfoxide(ODSO)-carbon tetrachloride extracting uranium(Ⅵ）

The liquid-liquid extraction behavior of uranium(Ⅵ） from nitric acid aqueous solution with n-octyldodecylsulfoxide(ODSO) has been studied over a wide range of conditions.The extracted species appear to be UO2(NO3)2.2O DSO.It was found that the extraction was increased with increasing sodium nitrate concentration. Extracting also increases with increasing extractant concentration.The influence of temperature and nitric acid concentration on extraction equilibrium was also investigated and gthe enthalpy of the extraction reaction was obtained.     

Solvent extraction of uranium（Ⅵ） and europium（Ⅲ） from nitrate media by picolinamide

The solvent extraction of uranium(Ⅵ) and europium(Ⅲ) from nitric acid solution was studied with picolinamide dissolved in ethylene dichloride. The distribution ratios of U(Ⅵ) and Eu(Ⅲ) as a function of aqueous HNO3 concentration, extractant concentration in organic phase and temperature as well as the salting-out agent concentration have been measured. The experiment results show that picolinamide has higher extractability for U(Ⅵ)than for Eu(Ⅲ). The composition of extracted species, equilibrium constants and enthalpies of extraction reaction have also been presented.     

Extraction of U（VI） and Th（IV） with a novel extractant N,N‘—tetrahexylmalonamide （THMA） in toluene

The dependence of THMA extraction behaviour for U(VI) and Th(IV) on nitric acid concentration,THMA concentratioin and molecular structure of extracted complex has been studied.For nitric acid solutions of 3.0 mol/L a coordinative mechanism may possibly dominate in the extraction of metal catioins,The complex composition of UO2(NO3)2(THMA)2,Th(NO3)4(THMA)2 and Th(NO3)4(THMA03 are proved.     

Extraction of uranyl（VI）ion with N,N—dibutyloctadecanamide from nitric acid solution

The extraction of U(VI) with newly synthesized long chain alkyl amide,N,N-dibutyloctadecanamide(DBODA),has been studied.The dependence of the extraction on nitric acid concentration,DBODA concentration and temperature from nitric acid solution has been investigated and the extracted species has also been investigated using FT-IR spectrometry.The related thermodynamic functions were calculated.The separation factor between U(VI) and Th(IV) is higher and there is no third phase formation under the conditions studied.     

One step graft copolymerization of acrylic acid and sodium styrene sulfonate onto high－density polyethylene film by preirradiation method

High-density polyethylene(HDPE)films were irradiated by ^60Co gamma ray with a dose of 100kGy in air and then immersed in aqueous solution of acrylic acid(AA) and sodium styrene sulfonate(SSS) at different temperature.The effects of grafting conditions such as temperature,reaction time ,Mohr‘s salt concentration,and total concentration of monomer on grafting yield were studied.Both grafting yield of AA and SSS onto HDPE respectively increases with total concentration of monomer on grafting yield were studied.Both grafting yield of AA and SSS onto HDPE respectively increases with total concentration of monomers.The highest grafting yield was observed at 3mol/L monomers where the grafted PE swelled to the largest extent in the monomers mixture.The grafting yield increases with reaction time and then levels off.At higher temperature,the grafting yield decreases with Mohr‘s salt concentration,but increases at low temperature when Mohr‘s salt concentration is 0.083%.Which can be interpreted that in the presence of Fe^2 diperoxides and hydroperoxides may decompose at low temperature to form radical which can initiate the grafting.The physical and chemical properties of grafting films were also investigated.     

Influence of solvents on extraction of U（VI） by N,N‘—didecanoylpiperazine

Extraction behavior of N,N‘-didecanoylpiperazine(DDPEZ)for U(VI) in a series of solvents from aqueous nitric acid media was investigated for the first time.The dependence of distribution ratios on the concentration of aqueous nitric acid,extractant and temperature has been discussed.The increasing sequence of extractive ability of DDPEZ is given:chloroform,carbon tetrachloride,dimethylbenzene,toluene,benzene.     

Influence of Technetium on Stability of U(Ⅳ) and Hydrazine in 1B Unit of Purex Process

<正>In this research,the technetium-catalyzed oxidation of U(Ⅳ)-hydrazine by nitric acid was studied by spectrophotometry.The results show that to the catalyzed oxidation reaction rate of U(Ⅳ),the concentration of technetium and temperature were the major influence factors,the concentration of U(Ⅳ)shows first order reaction characteristics,the concentration of hydrazine has only a little influence.In the nitric acid solu-     

Solvent extraction of U（VI） and Th（IV） ions with N,N,N‘,N’—tetrabutylsuccinylamide from nitric acid solutions

The solvent extraction of U(VI) and Th(IV) from nitric acid medium by N,N,N‘,N‘-tetrabutylsuccinylamide(TBSA) in a diluent composed of 0.5 volume fraction trimethyl benzene(TMB) and 0.5 volume fraction kerosene(OK) has been studied.The distribution ratios of U(VI) and Th(IV) as a function of aqueous HON3 concentration,extractant concentration and temperature have been measured.From the data,the composition of extracted species,equilibrium constants and enthapies of extraction reaction are also calculated.