Biodegradation of tributyl phosphate, an organosphate
TBP is commercially used in large volumes (3000–5000 t/annum) as an extractant for uranium and plutonium at nuclear fuel reprocessing facilities [1]. It is also used in defoamers, plastisizers, herbicides, and hydraulic fluids [2]. TBP bearing aqueous wastes can arise in large amounts due to its wide-spread use 2.
Extraction of actinides by Tri-n-butyl phosphate derivatives
Tri- n-butyl phosphate (TBP) is one of the commonly used extractant in PUREX process since last six decades and has been the workhorse for the recovery and purification of uranium and plutonium from the irradiated nuclear fuels [1]. The process employs 30% (1.1 M) solution of TBP diluted with suitable diluents [2].
Determination of monobutyl phosphate and dibutyl phosphate
substantial amounts of tri-n-butyl phosphate (TBP), 1,2 which was used as a metal extractant to separate uranium, plutonium, and thorium in the reprocessing of spent nuclear fuel. Both thermal decomposition and radiolysis of Na4EDTA 76.0412 TBP have generated dibutyl phosphate (DBP), monobutyl Stcaric acid 54.1017
Reprocessing of Thorium Fuel: Pyrochemical and Aqueous Routes
It has been successfully implemented at the pilot scale, but requires further study, in particular, for the dissolution step of thorium, which is inefficient. The other method adopted by India is the Interim-23 process, which extracts uranium but leaves the thorium in the waste.
Distribution of Fission Products into Tributyl Phosphate
Tributyl phosphate (TBP) is an important industrial extractant used in the Plutonium Uranium Redox Extraction (PUREX) process for recovering uranium and plutonium from used nuclear fuel. Distribution data have been assessed for a variety of fission and corrosion product trace metals at varying uranium concentrations under representative PUREX extraction (3 M HNO3) and stripping (0.1 M HNO3
- Does nitric acid concentration affect distribution ratio of dibutyl phosphate?
- The variation in distribution ratio for U (VI) by 1.1 M dibutyl phosphate (DBP) as a function of nitric acid concentrations was investigated and it was observed that at lower acidity D U (VI) value for DBP (II) is considerably large and itdecreases gradually with the increase of acid concentration.
- What is tri-n-butyl phosphate (TBP)?
- Tri- n-butyl phosphate (TBP) isone of the commonly used extractant in PUREX process since last six decades and has been the workhorse for the recovery and purification of uranium and plutonium from the irradiated nuclear fuels . The process employs 30% (1.1 M) solution of TBP diluted with suitable diluents .
- How does dbdecp (VI) affect nitric acid extraction?
- Extraction of nitric acid by DBHeP (III), DBCyHeP (IV) and DBPP (V) is almost same throughout the acidities. The presence of carbonyl group (C O) in DBDECP (VI) strongly decreases the electron density at phosphoryl oxygen, resulting in lower nitric acid extraction, which is nearly similar to TBP (VII).
- What chelating sites does DBP (II) have?
- DBP (II) has two chelating sites, viz.P O and P OH groups, at lower acidity ion exchange mechanism is the predominant mode of extraction of actinides, at higher acidity, the higher concentration of H + drives the reaction to the reactant side with no metal complex formation.
- How can a neutral organophosphorus extractant be enhanced?
- The extracting power of neutral organophosphorus extractants can be enhanced by anincrease in the electron availability on the donor atom. The introduction of longer alkyl chain, branching in the alkyl groups near the donor atom are likely to make a marginal increase in the basicity of the extractant.
- Are organophosphorus based extractants exothermic?
- The extraction process of U (VI) and Th (IV) isexothermic. 31 P chemical shift values, FT-IR absorption frequency values are good agreement and evident for the electron density (basicity) of the phosphoryl oxygen (P O). Thus the field of organophosphorus based extractants are seems to be wide open for exciting investigations.
