160 results about "Isotope separation" patented technology

The invention provides a non-woven base composite membrane for lithium isotope separation and a preparation method thereof, as well as a lithium isotope separation method by using a membrane chromatography. The non-woven base composite membrane takes a non-woven fabric as a porous support body or a micropore membrane, a coating is prepared on the non-woven fabric by taking a crown ether graft polymer or a Kryptofix graft polymer with a lithium isotope separation effect as a film forming matter, or a coating can be prepared on the non-woven fabric by blending crown ether or Kryptofix and derivates of the crown ether or the Kryptofix into a film-formation polymer solution, and the coating and a base membrane are combined to form a composite separated membrane; the composite separated membrane is taken as a membrane chromatography medium stationary phase, so as to separate lithium isotopes by using the membrane chromatography. The non-woven base composite membrane or the lithium isotope separation method by using the membrane chromatography can effectively improve the contact and coupling efficiency of crown ether molecules and Lithium Ions in the separation process for solid-liquid extraction lithium isotopes, and realize the greenization, serialization and high efficient of the process of lithium isotope separation.

The invention provides a benzo crown ether graft polymer material with lithium isotope separation effect and a preparation method of the material. The polymer is a benzo crown ether graft polymer which is formed by taking polysulfone, polyethersulfone or polyetheretherketone containing a chloromethyl group as a substrate and benzo crown ether as a side hanging group and connecting by chemical bonds. The preparation process of the polymer is as follows: preparing chloromethylated polymer under the action of proper catalyst and chloromethylation reagent; and carrying out unimolecular nucleophilic substitution reaction on the chloromethylated polymer and benzo crown ether with an active functional group at certain temperature under the action of an acid-binding agent to finish chemical graft so as to prepare the benzo crown ether graft polymer. The benzo crown ether graft polymer contains a crown ether group, thereby having excellent lithium isotope separation characteristic; and in addition, by adjusting the size of the crown ether ring, the graft polymer can be used for identification and separation of heavy metal ions and has wide application prospects.

The invention relates to a low-temperature finestiller for separating stable isotope elements, wherein it comprises at least one low-temperature finestill tower, which is packed with multilayer thermal-insulated layer at high vacuum; the tower is filled with multilayer stuff; the density of multilayer thermal-insulated material is 10-150layer/cm; the vacuum of thermal-insulated layer is lower than 10-1Pa; the stuff is wave stuff as plate wave stuff and mesh wave stuff as best. The inventive separating method comprises processing low-temperature gas-liquid conversation in the low-temperature finestill tower, to separate the isotope elements. The invention can be used in CO, CH4, NO, BF3, O2, H2, He, or Ne to separate 3CO, 3CH4, C18O, 18OO, 15NO, N18O, 10BF3, 2H, 3H, 3He, 22Ne, 12CO, 12CH4, N16O, 14NO, 11BF3, and 20Ne.

A method for laser-assisted separation and enrichment of silicon isotopes such as 28Si, 29Si and 30Si on the basis of infrared multiple-photon dissociation of silicon halides represented by Si2F6, wherein the silicon halides are irradiated synchronously with multiple infrared pulsed laser beams at different wavelengths.

A focused ion beam apparatus enables an ion beam to be focused highly accurately on a sample at the beam spot position of the case of the absence of magnetic field without causing isotope separation of the ion beam on the sample, even when there is a magnetic field on the ion beam optical axis or the magnetic field fluctuates. The focused ion beam apparatus comprises a corrective magnetic field generating unit 10 disposed on the optical axis of the ion beam 3 for correcting the deflection of the ion beam 3 due to an external magnetic field. The corrective magnetic field generating unit 10 includes pole-piece pairs 26A and 26B, each of which having two pole pieces 26a and 26b or 26c and 26d that are adjacent to each other with a gap d. The pole-piece pairs 26A and 26B are disposed opposite to each other with a gap g (>d) across the optical axis of the ion beam 3. Each of the pole pieces 26a to 26d is wound with an internal coil 29, and the pole-piece pairs 26A and 26B are each wound with an external coil 30 in such a manner as to surround the internal coils 29.

The invention provides a method for separating lithium isotopes by coupling an electric field and a crown ether graft polymer porous membrane. According to the method, a lithium isotope separation effect of the crown ether functionalized polymer membrane and a lithium isotope separation effect under the action of the electric field are coupled so as to enhance the lithium isotope separation effectof a system; specifically, the crown ether functionalized porous membrane with the lithium isotope separation effect is fixed in the middle of a diffusion cell, the two sides of the diffusion cell are provided with a lithium salt solution and pure water respectively, the selective adsorption effect of the functionalized membrane on <7>Li<+> is utilized, and <6>Li<+> is enriched on the pure waterside; and meanwhile, the <6>Li<+> has a higher migration rate under the action of the electric field, so that the migration rate of <6>Li<+> isotope ions towards the pure water side is increased, andfinally, green and efficient lithium isotope ion separation is realized.

The invention belongs to the technical field of monitoring of nuclear technology, and discloses a method for measuring the isotope ratio of uranium in a single particle. The method comprises the following steps: firstly seeking a uranium-containing particle by using a scanning electron microscope, using a micro-operation system to transfer the uranium-containing particle to a conductive adhesive with a marked metal mesh on the surface, positioning and fixing the uranium-containing particle, and then analyzing the isotope ratio by using a laser ablation-inductively coupled plasma mass spectrometry. The method has the advantages of simple and quick pre-treatment method, simplified analysis flow, and high analysis precision which can reach to 1%.

The present invention relates to a system of analysis, which can be used in a mobile laboratory in a drilling site situation or in a similar situation, suitable for measuring (preferably in relation to at least two partially gaseous species, which derive preferably from a mixture extracted from a drilling mud, for example, methane, ethane, propane and/or any other heavier hydrocarbons) the quantities of the different isotopes of at least a same chemical element (preferably the quantities of ¹³C, carbon isotope with 6 protons and 7 neutrons, and of ¹²C, carbon isotope with 6 protons and 6 neutrons, respectively) by means of a laser isotopes analyser regulated for a single, at least partially gaseous species which contains said chemical element.

The invention relates to a fluorine-containing extractant for lithium isotope separation and application thereof. Specifically, the invention discloses a fluorine-containing extractant for lithium isotope separation shown as formula (I) and an extraction organic phase containing the extractant. Being cheap and easily available, the extractant has the characteristics of excellent chemical stability, and easy back extraction and regeneration cycle. The extraction organic phase has a high extraction rate on lithium ions and is easy to gather 7Li, thereby realizing separation of the lithium isotope.

An anode and cathode for an electrolytic cell configured as a low inductance transmission line to enable control of an interphase at an electrode surface. The anode and cathode are coupled to a switched current source by a low inductance path that includes a parallel plate transmission line, a coaxial transmission line, or both. The switched current source provides fast switching between current sources to provide fast charging and discharging of the double-layer capacitance associated with the electrode surface so that an isotope may be selectively transported to the electrode surface for oxidation or reduction. A photon source may be used to create a population of isotope containing species within the electrolyte. An additional static magnetic field and/or an alternating current magnetic excitation source may be used to modify the composition of the population of species containing the isotope to be separated.

The invention provides a method for removing water in anisole by using a loaded type calcium oxide water removing agent and relates to an industrial anisole water removing method. The method is characterized by comprising the following steps: filling the loaded type calcium oxide water removing agent into a fixed-bed reactor and pumping anisole liquid containing trace amount of water by using a high-pressure pump; controlling a reaction temperature to be 25 to 160 DEG C to react; by using a CaO+H2O=Ca(OH)2 chemical reaction, finally obtaining an anhydrous anisole solution, wherein the content of the anisole in raw materials is 70 percent to 99 percent and the mass percent of calcium oxide in the loaded type calcium oxide water removing agent is 5 percent to 30 percent. With the adoption of the method, a bottleneck problem of the trace amount of water in the anisole to a boron isotope separation industrial production process is solved; meanwhile, influences that a pasty calcium hydroxide product generated on the outer surface in a calcium oxide water removing process covers calcium oxide and a water removing reaction is not continuously carried out are avoided, and the calcium oxide water removing efficiency is improved.

The invention relates to a production method and a production device of chemical products, in particular to the production method of doubly labeled water consisting of deuterium and heavy oxygen O<18> enriched by a water reification method as well as a water rectification device thereof. The rectification device provided by the invention consists of a rectification tower in multilevel series or in multilevel and parallel series; each level of the rectification tower are connected in phase transition way; the connection way is to transport the steam in tower bottom to the top of the lower tower by using pressure difference and the steam is condensed to be liquid phase to enter lower level tower; ascending steam of the lower tower top is condensed to be liquid phase and then flows into higher level tower top automatically. In the invention, as a reboiler at the tower bottom adopts falling film evaporation, the tower bottom is dry all the time without the retention of liquid to greatly save the balancing time. On the other hand, as no rotating parts such as a pump, etc. is adopted, the possible troubles caused by leakage, power failure, mechanical fault, etc. can be avoided to ensure constant and reliable operation of the system, which is important for isotope separation.

The invention discloses a construction method based on a technology for producing boron isotope by anisole-boron trifluoride, which belongs to the field of isotope separation, and mainly aims at solving the problems such as low yield of boron-10 and incapability of obtaining qualified boron-11 products at the same time in the existing construction method based on the technology for producing boron isotope by anisole-boron trifluoride. The method disclosed by the invention comprises the following steps: continuously purifying raw materials, namely boron trifluoride gas and an anisole liquid, as well as an anisole-boron trifluoride complex before entering a cracking tower, nitrogen gas coming out of the top of a complex gas stripping tower, boron trifluoride gas after cracking, and gas coming out of the top of a first exchange rectifying tower; adding the purified nitrogen gas into a second exchange rectifying tower; adding fresh boron trifluoride gas into the first exchange rectifying tower, wherein boron-10 is not discharged out from the top of the cracking tower and boron-11 is not discharged out from the top of a complexation tower; and after performing system rectification balance for 72-148 hours, converting to the normal production mode. The method has the advantage that the two qualified products, namely boron trifluoride-10 and boron trifluoride-11 can be produced at the same time.

The invention discloses a liquid phase cascade rectifying device for isotope separation, which pertains to the technical field of separation and rectification equipment. The rectifying device comprises a group of rectifying towers which are mutually connected through pipes and each rectifying tower comprises a bottom reboiler, a first pipe, a first overhead condenser, a second overhead condenser, a liquid storage tank, a vapor pipe and a reflux pipe. The rectifying device is characterized in that: the first pipe is provided with a liquid circulating mechanism which is applied to leading liquid from a previous stage of rectifying tower to the top of a next stage of rectifying tower; a catch mechanism which is used for separating the liquid which is in the next stage of rectifying tower and led into by the reflux pipe from the liquid fell from the previous stage of rectifying tower is arranged at the lower part of the rectifying tower and the corresponding upper part of the bottom reboiler. The device has the advantages of being conducive to saving energy and guaranteeing separation efficiency.

The invention discloses a centrifugal separation method of titanium isotopes. The centrifugal separation method specifically comprises the step of separating the titanium isotopes by virtue of a domestic gas centrifuge and a centrifugal separation working medium titanium tetrachloride. The centrifugal separation method is characterized by comprising the steps of introducing purified gas-state titanium tetrachloride into the domestic gas centrifuge in a certain feeding flow, adjusting the pressure intensity of a feeing pipe hole of the centrifuge and pressure intensity parameters of concentrated and lean pipe holes, respectively receiving the material at concentrated and lean ends, carrying out sampling when each parameter is stabilized, and carrying out analysis by virtue of a gas mass spectrometer so as to realize the separation of the titanium isotopes and evolution of a separation effect. The method is low in energy consumption, relatively large in separation coefficients and suitable for cascading large-scale production; and furthermore, the obtained lean material and the raw material are only different from abundance, and the obtained lean material can be recycled as a chemical reagent to be continuously used, so that the centrifugal separation method of the titanium isotopes has certain advantages.

The invention discloses an industrial production method for separating a boron isotope product based on a methyl-phenoxide-boron trifluoride complex, belonging to the technical field of separation of isotope. The industrial production method mainly aims to solve the problem that a methyl-phenoxide-boron trifluoride complex chemical reaction exchange rectifying method is serious during vacuum material carrying and the like. The industrial production method comprises the following steps: firstly, performing gas stripping and drying treatment to the methyl-phenoxide-boron trifluoride complex, continuously adding the methyl-phenoxide-boron trifluoride complex from a gas stripping tower kettle into a first exchange rectifying tower kettle, continuously extracting liquid in the fore exchange rectifying tower kettle into the next tower top, condensing steam at the top of the next tower top, and continuously entering the fore tower kettle; under pressure-reduced heating distillation, enabling a boron trifluoride gas and methyl ether gas to enter shell passes of a condenser and a catcher, enabling a coolant to travel the shell passes of the condenser and the catcher, wherein a minus 60DEG C methyl ether solution pump is conveyed to a spray device so as to spray a boron trifluoride gas, the boron trifluoride gas and the methyl ether gas are converted into the methyl-phenoxide-boron trifluoride complex. The industrial production method has the advantage of being capable of solving the problem of vacuum material carrying.

Isotope enrichment by laser activation wherein a multi-isotopic element Q, like Uranium, Silicon, Carbon is incorporated into gaseous QF_n, QF₆, QF₄, QO_mF_n, etc and diluted in gas G like He, N₂, Ar, Xe, SF₆ or other inert gas; and wherein that mixture is cooled by adiabatic expansion or other means encouraging formation of dimers QF₆:G in a supersonic super-cooled free jet; and wherein that jet is exposed to laser photons at wavelengths that selectively excite predetermined molecules ⁱQF₆ to ⁱQF₆*, thereby inducing rapid VT conversions and dissociations of ⁱQF₆*:G→ⁱQF₆+G+kT, while leaving non-excited dimers ^jQF₆:G intact; and wherein a skimmer separates the supersonic free-jet core stream containing heavier ^jQF₆:G dimers from lighter core-escaped ⁱQF₆-enriched rim gases. Particularly an advanced technique is disclosed to enrich ⁱUF₆ by free jet expansion and isotope-selective dimerization suppression, utilizing a molecular CO laser and intra-cavity UF₆ irradiation with laser lines overlapping predetermined ⁱUF₆ absorptions; and providing multiple free jet separator units irradiated by one laser beam, thereby enhancing process economics.

The invention discloses a growing method of a magnesium aluminate spinel crystal doped with transition metal ions. The molecular formula of the crystal can be expressed as TM2xMgAl2(1-x)O4 and Tm'yMg1-yAl2O4 (TM=Ti<3+>, Cr<3+>, Fe<3+> and Ni<3+>; TM'=Mn<2+>, V<2+> and Co<2+>, 0<x<1, and 0<y<1). The growing method is characterized in that MgAl2O4 polycrystalline raw materials synthesized with the flame method and transition metal oxides prepared according to the proportional concentration are placed in an iridium crucible and sufficiently heated to be molten, the magnesium aluminate spinel crystal or the doped magnesium aluminate spinel crystal is adopted as a seed crystal, and crystal growth is conducted with the Czochralski method. According to the method, the crystal with the large size and high quality can be obtained and be expected to be applied to the fields of micromachining, laser medicine, laser chemistry, laser printing, military application, underwater communication and axis isotope separation.

Atomic forcipes is a nanomechanical magnetoelectric element having an insulator, an atom-thick conductive graphene sheet suspended as a heterostructure onto the insulator, and a gallery between the insulator and the graphene sheet. Atomic forcipes can be actuated acoustically or electromagnetically. Activation generates a chemical potential of directionally enhanced chemical reaction rate. Atomic forcipes can be formed by selecting enhanced graphene having a particle size, providing piezoelectric smectite clay of the particle size, combining graphene particles with clay, adding a compatibilizer, and irradiating with ultrasound, UV, or microwaves. Isotope separation apparatus and methods are supported by atomic forcipes. A method by mixing an aqueous phase suspension of atomic forcipes with nuclear magnetic isotope (NMI) ions, applying ultrasound to promote NMI ion intercalation, applying ultraviolet light to generate free radicals on the NMI ions, and extracting enriched NMI ions from the piezoelectric sheets. Another method employs nuclear spin using nuclear magnetic stiction.

The present invention relates to a grain production place discriminating method which utilizes a heavy element isotope ratio composition. The isotope ratios of strontium and lead which are contained in the grain, namely an abundance ratio of a strontium isotope which is composed of mass numbers of 87 and 86, and a lead isotope which is composed of mass numbers of 208,207,206 and 204 are analyzed. The production place of the grain is discriminated through the analysis information.

The invention relates to nuclear material analysis by radiation methods and can be used for on-line monitoring uranium hexafluoride enrichment in isotopic dividing production. The uranium-235 gamma-radiation intensity, the temperature and the pressure of uranium hexafluoride are determined by means of averaged measurement results within identical time intervals when a current time is changed at a value equal to the time segment of the time interval. The calculated value of the uranium-235 mass fraction is referred to the current time in coincidence with the measuring time interval. The invention also discloses a control system of the method, wherein at least three descriminators and a timer are mounted in a controller, the output end of the descriminator is connected with the input end of a gamma emission detector, each output end of the descriminators is connected with the input end of single electrical impulse counter.

The invention discloses a method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion, comprising the following steps: analyzing mass concentration of NH4<+> in an atmospheric aerosol sample by ion chromatography; filtering and extracting the sample by an ultrasonic oscillator to form 0.25 microgram NH4<+>/ml solution; oxidizing NH4<+> with alkalinehypobromite into NO2<->; reducing NO2<-> with hydroxylamine hydrochloride into N2O at pH of less than 0.3; measuring N2O nitrogen isotope ratio by Precon + GasBench II+IRMS combination; and establishing a standard curve and calculating nitrogen isotope ratio of NH4<+> in the atmospheric aerosol sample. The method of the invention has the following advantages: result accuracy is high, and accuracyafter repeating for 10 times reaches 0.005%.

The invention discloses a method for separating boron isotopes by using a metal-organic framework material as a stationary phase of a simulated moving bed. The method comprises the steps of (1) respectively filtering aqueous solution of boric acid and aqueous solution of hydrochloric acid by a filter membrane, removing impurities and carrying out ultrasonic degassing; (2) dividing the simulated moving bed into I to IV regions, enabling each region formed by 3 to 7 chromatographic columns, using the metal-organic framework material as the stationary phase of the simulated moving bed, setting flow rates of the I to IV regions, port switching time and an operating temperature, continuously adding the aqueous solution of boric acid into the chromatographic columns of the simulated moving bed, carrying out elution by the aqueous solution of hydrochloric acid, and after the simulated moving bed reaches a balanced state, collecting aqueous solution of boric acid, which is enriched in an isotope 11B, at an extraction port of the simulated moving bed and collecting aqueous solution of boric acid, which is enriched in an isotope 10B, at an extraction raffinate port. The method is simple to operate and has higher separation efficiency; cost of concentrating the isotope 10B can be effectively reduced; the method has a high boron isotope separation factor, and the enrichment degree of the isotope 10B obtained by separation reaches 97.92% or more.

A device and method for magnetic field confinement of plasma is formed by a cylindrically stacked column of direct current-carrying magnetic field coils with electrodes adjacently interior to each magnetic field coils so as to induce plasma rotation about an annular confinement region. Each field coil produces a magnetic field alternating in direction relative to adjacent coils and, so as to maintain consistent overall azimuthal direction of plasma rotation, electric field electrodes alternate accordingly in polarity along the axial length of the device. The device may be used for inducing nuclear fusion, for the ionic or isotopic separation of elements, creation of thrust by ejecting mass along the axial direction of the device, for creating a gravitational acceleration field, and for creating a state change beyond plasma.

The invention discloses a method for separating boron isotopes by using MOF-74(Zn) as a simulated moving bed stationary phase. The method comprises the following steps: firstly, filtering a boric acid aqueous solution and a hydrochloric acid aqueous solution, then removing impurities and degassing; secondly, a simulated moving bed comprises I to IV areas, wherein 3 to 7 chromatographic columns are arranged in each area; taking the MOF-74(Zn) as the simulated moving bed in stationary phase; setting the flow rates of the I to IV areas, port switching time and operating temperature; continuously adding the boric acid aqueous solution into the chromatographic columns of the simulated moving bed, and eluting with the hydrochloric acid aqueous solution; after the simulated moving bed reaches the equilibrium state, collecting the boric acid aqueous solution enriched with isotope 11B at an extraction opening of the simulated moving bed and collecting the boric acid aqueous solution enriched with isotope 10B at the extraction opening of the simulated moving bed. The method disclosed by the invention is a method for continuously separating the boron isotopes and has the advantages of simple operation and relatively-high separation efficiency; in addition, the cost of concentrated isotope 10B can be effectively reduced and relatively-high boron isotope separation factors are obtained.