An object of the present invention is to provide a chemical liquid purification method which makes it possible to obtain a chemical liquid having excellent defect inhibition performance. Another object of the present invention is to provide a chemical liquid. The chemical liquid purification method according to an embodiment of the present invention is a chemical liquid purification method including obtaining a chemical liquid by purifying a substance to be purified containing an organic solvent, in which a content of the stabilizer in the substance to be purified with respect to the total mass of the substance to be purified is equal to or greater than 0.1 mass ppm and less than 100 mass ppm.

An object of the present invention is to provide a chemical liquid purification method which makes it possible to obtain a chemical liquid having excellent defect inhibition performance. Another object of the present invention is to provide a chemical liquid. The chemical liquid purification method according to an embodiment of the present invention is a chemical liquid purification method including obtaining a chemical liquid by purifying a substance to be purified containing an organic solvent, in which a content of the stabilizer in the substance to be purified with respect to the total mass of the substance to be purified is equal to or greater than 0.1 mass ppm and less than 100 mass ppm.

A metal ion generator for fluids includes a pipe having an insertion aperture positioned between the fluid inlet and fluid exit, and a conductive member configured to be removably secured in the insertion aperture. The conductive member includes a rigid non-conductive extension and a metal bar. When secured in the insertion aperture, the rigid non-conductive extension positions the metal bar into the direct flow of fluid between the fluid inlet and the fluid exit. A power source applies a voltage to the conductive member causing the metal bar to function as an anode and generate metal ions that are transferred into the fluid. The power supply also connects to a cathode such as the pipe or a second conductive member secured in the insertion aperture.

A process for selective isolation of high molecular weight (˜1230 Daltons) naphthenic acids (Arn acids). The process includes providing a polymeric resin with a bound a quaternary amino group and applying a crude oil sample containing Arn acids to the polymeric resin. A first wash of an organic solvent is applied to the sample followed by a second wash of a polar organic solvent mixture. The first two washes remove unwanted crude oil compositions while the Arn acids are bound to the quaternary amino groups. A third wash of acidified organic solvent removes the Arn acids from the polymeric resin, thereby forming an elute comprising the Arn acids and the acidified organic solvent. The acidified organic solve is then evaporated isolating the Arn acids from the crude oil sample.

A process for selective isolation of high molecular weight (˜1230 Daltons) naphthenic acids (Arn acids). The process includes providing a polymeric resin with a bound a quaternary amino group and applying a crude oil sample containing Arn acids to the polymeric resin. A first wash of an organic solvent is applied to the sample followed by a second wash of a polar organic solvent mixture. The first two washes remove unwanted crude oil compositions while the Arn acids are bound to the quaternary amino groups. A third wash of acidified organic solvent removes the Arn acids from the polymeric resin, thereby forming an elute comprising the Arn acids and the acidified organic solvent. The acidified organic solve is then evaporated isolating the Arn acids from the crude oil sample.

A magnet positioning system for positioning magnets inside pipes includes a first stackable paddle that includes slots for accepting magnets and a second stackable paddle that includes a metal component for attracting the magnets and securing the magnets in the slots when the paddles are stacked together. Once stacked together, the paddles are inserted into position inside a pipe and the metal component is removed to release the magnets which move toward, and attach to, the inside wall of the pipe. A fluid conduit is positioned between the magnets using a spacer and a fixing agent permanently secures the magnets, fluid conduit, and spacer in place.

Methods and systems for separation of thorium from uranium and their decay products are provided. The method comprises combining a nuclear fuel feedstock comprising thorium and uranium with a first acid to form a first solution. The first solution is contacted an ion exchange resin that is selective for thorium or uranium. The thorium or uranium is at least partially removed from the first solution by binding the thorium or uranium to the ion exchange resin thereby forming a second solution. The second solution is combined with oxalic acid to precipitate uranium or thorium from the second solution to form a precipitate. The precipitate is separated from the second solution.

Methods and systems for separation of thorium from uranium and their decay products are provided. The method comprises combining a nuclear fuel feedstock comprising thorium and uranium with a first acid to form a first solution. The first solution is contacted an ion exchange resin that is selective for thorium or uranium. The thorium or uranium is at least partially removed from the first solution by binding the thorium or uranium to the ion exchange resin thereby forming a second solution. The second solution is combined with oxalic acid to precipitate uranium or thorium from the second solution to form a precipitate. The precipitate is separated from the second solution.

A magnet positioning system for positioning magnets inside pipes includes a first stackable paddle that includes slots for accepting magnets and a second stackable paddle that includes a metal component for attracting the magnets and securing the magnets in the slots when the paddles are stacked together. Once stacked together, the paddles are inserted into position inside a pipe and the metal component is removed to release the magnets which move toward, and attach to, the inside wall of the pipe. A fluid conduit is positioned between the magnets using a spacer and a fixing agent permanently secures the magnets, fluid conduit, and spacer in place.

To provide a method for producing a fluorinated polymer which enables stable production of a fluorinated polymer having a high molecular weight at a high polymerization rate with good productivity and reduced environmental burdens, a method for producing a fluorinated polymer having functional groups, and a method for producing an electrolyte membrane. A method for producing a fluorinated polymer, which comprises polymerizing a monomer mixture containing tetrafluoroethylene and a fluorinated monomer having a group convertible to a sulfonic acid group or a carboxylic acid group in a polymerization medium, wherein the polymerization medium contains as the main component a C.sub.4-10 cyclic hydrofluorocarbon. Further, a method for producing a fluorinated polymer having functional groups and a method for producing an electrolyte membrane, employing the production method.