Taiyo Nippon Sanso Corporation

Takashi Kambe

Hitoshi Kihara

Shigeru Hayashida

Hiroshi Kawakami

Takehiro Igarashi

Shigeyoshi Arai

Akihiko Maeda

Hayato Sakurai

Takeshi Ochi

Norihisa Nara

The object of the present invention is to provide a stable isotope concentrating device that has high energy efficiency and can reduce equipment costs, and provides a stable isotope concentrating device including a distillation column group in which multiple distillation columns are cascaded, and the distillation column group includes: a tray column group including one or more tray columns; and a packing column group including one or more packing columns, and the packing column group is located on a secondary side of the tray column group.

Stable isotope concentrating device

The object of the present invention is to provide a stable isotope concentration method that reduces equipment cost and power without prolonging the start-up time and enables efficient concentration, and the present invention provides a stable isotope concentration method using multiple cascaded distillation columns (1st column to mth column; m is an integer of 2 or more), wherein the method includes a step in which one of gas and liquid is supplied from a position in the vicinity of the bottom of a (n−1)th column to a position in the vicinity of the top of an nth column (1<n≤m), and the other of liquid and gas is returned from a position in the vicinity of the top of the nth column to a position in the vicinity of the bottom of the (n−1)th column; and wherein in each distillation column, when a flow rate of an ascending gas in the column is a first flow rate and a flow rate of the gas or the liquid supplied from a previous column or a next column is a second flow rate, the second flow rate is 4% by volume or more with respect to the first flow rate.

Stable isotope concentration method

The present invention provides a method for enriching an oxygen isotope which enables the oxygen isotope to be enriched without requiring regular replenishment of large amounts of the nitric oxide raw material and with a small liquid NO hold-up volume, without reducing the separation efficiency for the oxygen isotope. By performing a chemical exchange between a water acquired by adding hydrogen to an oxygen having a crudely enriched oxygen isotope produced by a first distillation device, and a nitric oxide discharged from a second distillation device, a nitric oxide having an enriched concentration of the oxygen isotope and a water having a reduced concentration of the oxygen isotope are obtained, and the nitric oxide is supplied to the second distillation device, while an oxygen obtained by electrolysis of the water having a reduced concentration of the oxygen isotope is returned to the first distillation device.

Method for enriching oxygen isotope

One object of the present invention is to perform compartmental analysis of the dynamics of a tracer in the brain, and the present invention provides a compartmental analysis system including a measurement apparatus that measures the strength of an electromagnetic wave from a tracer and a compartmental analyzer that performs compartmental analysis of the dynamics of the tracer in the brain on the basis of the strength of the electromagnetic wave, wherein the compartmental analyzer includes a rate constant calculation unit that calculates a rate constant when the tracer moves between compartments on the basis of the strength of an electromagnetic wave in a first compartment corresponding to the cerebral blood vessel in the brain or an input function in the first compartment, the strength of an electromagnetic wave in a second compartment corresponding to the brain tissue in the brain, and the strength of an electromagnetic wave in a third compartment corresponding to the cerebral sulcus or cerebral ventricle in the brain.

Compartmental analsys system, compartmental analysis method, compartment analyzer, program, and recording medium

The method for concentrating an oxygen isotope or isotopes of the present invention combines the step of concentratingO and/or the step of depletingO that utilizes photodissociation of ozone by a laser beam with an oxygen distillation step that concentrates the oxygen isotope. At this time, it is preferable to carry out a step of isotope scrambling in addition to the above. When both a step of concentratingO and a step of depletingO are carried out, whichever thereof may be done first prior to the other. Also these steps may be placed either before or after the oxygen distillation step. Moreover, at least one of said oxygen distillation step, the concentratingO step, the depletingO step and the isotope scrambling step is preferably carried out twice or more.

Method for concentrating oxygen isotope or isotopes

A distillation apparatus of the present invention includes a distillation column group in which a plurality of distillation columns including a condenser and a reboiler is connected in the form of a cascade; a gas-feeding line which feeds gas from the distillation column to a latter distillation column; a gas line which introduces the gas from the distillation column to the condenser attached to the distillation column; a liquid-line which withdraws a condensed liquid from the condenser; a liquid-reflux line which introduces a part of the condensed liquid from the liquid-line to the distillation column; a liquid-return line which returns the remainder of the condensed liquid from the liquid-line to a former distillation column; a valve provided on the liquid-return line; and a bypass line which connects the liquid-return line and the gas line so as to flow an evaporated gas generated in the liquid-return line to the gas line.

Distillation apparatus

A method of enriching a heavy oxygen isotope by distillation of the present invention includes: a first distillation step of feeding oxygen and ozone generated by an ozonizerinto a distillation columnfilled with a diluent gas, and separating the oxygen, and the ozone and the diluent gas; a photodecomposition step of introducing a mixed gas of the ozone and the diluent gas from a bottom of the distillation column into a photoreaction cell, and irradiating the mixed gas with a laser light to selectively decompose the ozone containing the heavy oxygen isotope; and a second distillation step of returning non-decomposed ozone and oxygen containing the heavy oxygen isotope to the distillation column, and separating the oxygen, and the ozone and the diluent gas.

Method and apparatus for enrichment of heavy oxygen isotopes

A method for concentrating effectively the heavy nitrogen isotopeN to 50 atom % or more in whichNN and/orN, which are molecules containing a heavy nitrogen isotope ofN, are concentrated by distilling successively nitrogen Nusing plural distillation columns Tto Teach of which includes at least one condenser Cto Cand at least one reboiler Rto Rand is arranged in series, and a part of nitrogen in the distillation is drawn out to be subjected to isotope scrambling in an isotope scrambler S, and nitrogen after the isotope scrambling is returned to the distillation to produce nitrogen Nwith aN concentration of 50 atom % or more.

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Tsuchiura, Japan

Takashi Kambe