Nippon Sanso Corporation

Taiyo Nippon Sanso Corporation

Takeda Chemical Industries, Inc.

Koichi Asano

Shigeru Hayashida

Hiroshi Kawakami

Hitoshi Kihara

Hiroshi Tachibana

Takashi Kambe

Makoto Tanaka

Kazuo Kigasawa

Nobuaki Egoshi

Hideaki Ohtani

Tadahiro Ohmi

Akihiro Nakamura

Masato Kawai

Yoshio Ishihara

Tetsuya Kimijima

Shigeyoshi Arai

Takehiro Igarashi

Tooru Nagasaka

Toru Nagasaka

Katsuyoshi Kuwata

Ushio Maeda

Tomonobu Abe

Shigeru Tsuchiya

Yasuo Tatsumi

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

A gasket according to the present invention is for sealing a valve or pipe used in a high-pressure gas supplying equipment, which is comprised of a polymer material containing magnetic particles. Also, in a determination method of deterioration and damages of a gasket according to the present invention, the aforementioned gasket is used as the gasket for sealing a valve or pipe in a high-pressure gas supplying equipment, and the magnetic force of the gasket is measured to determine the deterioration and the damages of the gasket.

Gasket for sealing valve or pipe, determination method of deterioration and damages of gasket, and high-pressure gas supplying equipment

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 method of concentrating the stable oxygen isotopes ofO andO by irradiating ozone with light, selectively dissociating an isotopologue of ozone containing an oxygen isotope in its molecule into oxygen, followed by dissociating the ozone and separating the formed oxygen from the non-dissociated ozone. In the ozone photodissociation step, light is radiated onto a rare gas-ozone mixed gas containing ozone and at least one rare gas selected from krypton, xenon and radon is used to selectively dissociate ozone containing a specific oxygen isotope in its molecule into oxygen then the oxygen isotope is separated from non-dissociated ozone and rare gas to concentrate the oxygen isotope present in the separated oxygen.

Method for concentrating oxygen isotope

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.

Method for concentrating heavy nitrogen isotope

An apparatus comprising first to third columns, wherein the outlet of a first column reboiler and the inlet of a second column condenser are connected by a first introduction conduit, and the outlet of a second distillation column reboiler and the inlet of a third column condenser are connected by a second introduction conduit, and additionally the outlet of the second column condenser and the inlet of the first column reboiler are connected by a first return conduit, and the outlet of the third column condenser and the inlet of the second column reboiler are connected by a second return conduit.

Apparatus, method for enrichment of the heavy isotopes of oxygen and production method for heavy oxygen water

By using a dephlegmator which conducts distillation concurrently with heat exchange within at least one distillation column, or a portion of one distillation column, of a distillation cascade, the quantity of liquid holdup within the distillation apparatus is reduced and the start-up time is shortened. Consequently, the operational costs associated with startup are reduced, and productivity is improved markedly.

Method and device for separation and concentration by evaporation of mixture with separation factor of approx. 1

Apparatus, method for enrichment of the heavy isotope oxygen and production method for heavy oxygen water

The gas separation and purification process can recover efficiently a valuable gas such as krypton and xenon to be used as an atmospheric gas in a semiconductor manufacturing equipment etc. by means of PSA process. In the process for separating a valuable gas in the form of purified product from a mixed gas, used as a raw gas, containing the valuable gas by means of pressure swing adsorption process, the valuable gas is separated and purified by using as the pressure swing adsorption process a combination of equilibrium pressure swing adsorption process for separating gas components based on the difference in equilibrium adsorption and rate-dependent pressure swing adsorption process for separating the gas components based on the difference in adsorption rates.

Gas separating and purifying method and its apparatus

There is provided a method and an apparatus for collecting a rare gas, which are capable of effectively collecting the rare gas contained in an exhaust gas exhausted from a rare gas using apparatus such as a plasma apparatus or the like, and moreover capable of securely supplying the rare gas having a predetermined purity to the rare gas using apparatus, and the method for collecting rare gas which comprises collecting a rare gas contained in an exhaust gas exhausted from a rare gas using apparatus operated under decompression, the method comprises the step of collecting the rare gas by separating the rare gas and impurities contained in the exhaust gas via at least two gas separating steps.

Method and apparatus for collecting rare gas

In an vapor-liquid contactor for flowing down a liquid along the surface of a packing and contacting said liquid with the vapor while ascending the vapor, the improvement being characterized in that said packing is a non-promoting-fluid-dispersion type structured packing A , A in which various types of thin sheets or tubes for determining the flow direction of the above liquid or vapor is laminated and arranged in the perpendicular direction, and said contactor includes at least one fluid distribution unit E , E formed of a rough distribution part C , C to distribute the liquid roughly and a minute distribution part B , B to distribute the liquid minutely and equally.

Vapor-liquid contactor, cryogenic air separation unit and method of gas separation

A method and apparatus for enrichment of heavy oxygen isotopes is provided wherein an oxygen starting material which contains heavy oxygen isotopes is enriched in at least one of oxygen molecule O O, O O, O O, O O and O O, by means of cryogenic distillation of the oxygen starting material containing heavy oxygen isotopes. In addition, a method and apparatus are provided for further increasing the concentration of at least one of the heavy isotope oxygen molecules by means of conducting isotope scrambling on the above-mentioned plurality of oxygen molecules enriched by means of the above mentioned cryogenic distillation.

Method for enrichment of heavy component of oxygen isotopes

Oxygen starting material, which already contains heavy isotopes of oxygen, is enriched in the heavy isotopes of oxygen by means of cryogenic distillation in an oxygen distillation column system 1A, then water containing a high concentration of the above-mentioned heavy isotopes of oxygen is formed by adding hydrogen to the enriched product and reacting them in a reactor system 3A. This formed water is distilled in the water distillation column system 4A and, thereby, heavy oxygen water enriched in the above-mentioned heavy isotopes of oxygen is produced.

Method and apparatus for the production of heavy oxygen water

Stable isotope atoms present in the form of stable isotope compounds, for example,,C present in the form of,CO, are separated by distillation using a distillation column packed orderly with a formed packing, and preferably by distillation using a distillation column packed with a &ldquo;promoting-fluid-dispersion type&rdquo; structured packing.

Growing community of inventors

Kofu, Japan

Shigeru Hayashida