Abstract:
The invention relates mainly to a polymer comprising a hydrocarbon-based main chain bearing carboxylic groups and polyalkoxylated chains and up to 4% by weight of anti-oxidant groups, relative to the weight of the final polymer, grafted to the main chain. It also relates to a method for preparing such a polymer and to an admixture which is of use as a plasticizer of suspensions of mineral particles comprising same. Finally, it is related to the use of such a polymer for fluidifying suspensions of mineral particles and reducing the water demand of hydraulic compositions.
Abstract:
Disclosed is a method for preparing, by transcarbonation, a compound of formula (I), including reacting a polyol of formula (II) with an alkyl carbonate or an alkylene carbonate in the presence of a catalytic system consisting of a catalytic entity selected from among the rare earth oxides or the mixtures thereof, and optionally an inert substrate.
Abstract:
A process which allows separation of americium present in an acid aqueous phase or in an organic phase from the other metal elements also found in this phase, by complexation of the americium with a water-soluble ethylenediamine derivative; and a process for selective recovery of americium from an acid aqueous phase containing, in addition to americium, other metal elements, which comprises the application of this separation process.
Abstract:
This invention relates to novel polyether ionophores, formulations comprising same, and to methods of making and using these compounds and formulations for the treatment and/or prevention of parasitic infection in animals and humans. These compounds exhibit improved safety profiles and/or efficacies as compared to parent compounds.
Abstract:
The present invention relates to a process for preparing a polyol ether of formula (I), comprising a step of reductive alkylation involving a compound of general formula (II) and a compound of general formula (III): in which R1, R2, R3 and R4 are as defined in claim 1.
Abstract:
The invention relates to a process for separating, in an aqueous medium, at least one actinide element from one or more lanthanide elements by using at least one molecule which sequesters the said actinide element to be separated and membrane filtration, the said process successively comprising: a) a step of bringing at least one molecule which sequesters the said actinide element in contact with the aqueous medium, the said molecule not being retained in the non-complexed state by the said membrane and being capable of forming a complex with the actinide element to be separated, comprising the said element and at least two of the said sequestering molecules, which complex is capable of being retained by the membrane; b) a step of passing the aqueous medium over the membrane in order to form a permeate on one side, comprising an aqueous effluent depleted of the said actinide element, and a retentate comprising the said complex.
Abstract:
A process in which isotopes of the same element belonging to the alkaline earth metals, transition elements and heavy metals having an atomic mass of less than 209, in particular lanthanide metals, are separated in an aqueous medium by treating an aqueous medium.
Abstract:
The invention relates to the use of argon gas for producing all or part of an inhalable medicinal product intended to prevent or treat a neurointoxication in humans. The medicinal product contains argon in an effective proportion and acts on at least one brain receptor in order to regulate the functioning of dopamine-, glutamate-, serotonin-, acetylcholine-, taurine-, GABA- and/or noradrenalin-mediated neurotransmission systems. Preferably, the proportion by volume of argon in the gaseous medicinal product is between 15 and 80%. The neurointoxication is chosen from excitotoxicities engendering a state of addiction, acute cerebral accidents, neurodegenerative diseases, and psychiatric or neurological pathologies, in particular anxiety conditions, psychotic conditions, in particular schizophrenia, and epilepsy in its various forms.
Abstract:
The invention concerns a method for preparing a compound of formula (1) wherein: A represents naphthyl or phenyl optionally substituted; and Ar1, Ar2 independently represent a saturated or aromatic carbocyclic group, optionally substituted.
Abstract:
Process for separating plutonium from uranium contained in a nitric acid aqueous solution from the reprocessing of irradiated fuels comprising plutonium, uranium and fission products by means of crown ethers. Nitric acid aqueous solution (5) containing plutonium, uranium and fission products is contacted at (2) with an organic liquid membrane (3) containing a crown ether. The uranium and plutonium are extracted in the liquid membrane (3) and then transferred by said membrane into a receiving solution (7), which becomes enriched with uranium, because the latter is transferred more rapidly than the plutonium. The crown ether can be DCH 18 C6 or DB 18 C6.