Taiyo Nippon Sanso Corporation

Nippon Sanso Corporation

Other

Nec Corporation

Nippon Electric Co., Ltd.

Japan Oxygen, Co., Ltd.

Masato Kawai

Morimitsu Nakamura

Akihiro Nakamura

Tatsuya Hidano

Tooru Nagasaka

Tetsuya Kimijima

Masayoshi Hayashida

Shinichi Marumo

Tatsushi Urakami

Ryuichi Yazaki

Kunio Matsuda

Nobuhiro Okamura

Kazuhiko Fujie

Shin Hayashi

Tadahiro Ohmi

Yoshinori Watanabe

Shigeru Hayashida

Hidetake Okada

Yasuo Tatsumi

Kenji Kudo

Shoichi Hosaka

Yusuke Nakaya

Sakurai Toshihiko

Chie Samata

Shigeo Tooyama

Taisuke Suzuki

Shunji Enomoto

Teruji Kaneko

Kenji Ikeda

Hiroyuki Takei

Kazuto Usogoe

A purification method for feed air in cryogenic air separation of the present invention includes purifying the feed air for the cryogenic air separation by using a temperature swing adsorption method, wherein the whole region of a carbon dioxide adsorbent layer packed in an adsorption column is used as a mass transfer zone of a carbon dioxide. Also, a purification apparatus for feed air in cryogenic air separation of the present invention includes at least two adsorption columns; and a moisture adsorbent and a carbon dioxide adsorbent being laminated and packed in the adsorption columns, wherein the packed amount of the carbon dioxide adsorbent is the same as the amount of the carbon dioxide adsorbent in the region of the carbon dioxide adsorbent which a mass transfer zone of a carbon dioxide occupies at the end of an adsorption step, and a temperature swing adsorption method is used.

Purification method and purification apparatus for feed air in cryogenic air separation

A pre-purification method of feed air for cryogenic air separation, which includes; (a) an adsorption step wherein a compressed feed air is supplied in an adsorption column, wherein a moisture adsorbent and a carbon dioxide adsorbent are filled in this order from the side where the feed air is introduced in the column, to remove water and carbon dioxide from the feed air; (b) a decompression step wherein pressure in the adsorption column is reduced; (c) a heating step wherein the adsorbents in the decompressed column are heated and regenerated, and the heating step includes a total heating step wherein the moisture adsorbent and the carbon dioxide adsorbent are heated and a partial heating step wherein the moisture adsorbent is heated; (d) a cooling step wherein the adsorbents are cooled by introducing a purge gas, which is not heated, to the adsorption column; and (e) a pressurization step wherein the cooled adsorbents are pressurized by purified air.

Method of purifying air

This gas purifying process removes trace constituents from a mixed gas that includes a rare gas and nitrogen as main components, and at least one from among hydrogen, nitrogen and hydrogen reaction products, and water vapor as the trace constituent. This process sequentially carries out an adsorbing step for removing water vapor and nitrogen and hydrogen reaction products; a hydrogen oxidation step for converting the hydrogen into water vapor by means of a hydrogen oxidation catalytic reaction in the presence of oxygen; and a drying step for removing water vapor generated in the hydrogen oxidation step. When nitrogen oxides are included as a trace constituent, then a denitration step is carried out prior to the adsorbing step, to convert nitrogen oxides into nitrogen and water vapor by means of a catalytic denitration reaction in the presence of a reducing substance.

Gas purifying process and device

A hydrocarbon adsorbent that includes a zeolite with either a H-FER structure or a MOR structure in which the pore diameter has been adjusted by ion exchange. A propane adsorbent that includes a zeolite with a MFI structure having a Si/Al ratio of no more than 20. A hydrocarbon removal unit that includes a TSA pre-purification unit having a column packed with sequential layers of activated alumina, a NaX zeolite, and the hydrocarbon adsorbent. A method of reducing the hydrocarbon content within liquid oxygen inside a cryogenic air separation unit that includes purifying feed air with the above pre-purification unit.

Pre-purification unit of cryogenic air separation unit, hydrocarbon adsorbent, and method of pre-treating feed air

A gas purifier of the present invention includes a purifier in which a gas-purifying agent is packed, wherein a gas is fed into the purifier, and impurities in the gas are removed by a thermal swing adsorption method, in which an amount A of the gas-purifying agent is determined such that an impurities-removing capacity possessed by half of the amount A of the gas-purifying agent is equal to the total amount of impurities in the gas to be purified in one purification step, and the amount of the gas-purifying agent packed in the purifier is the amount A or more.

Gas purifier apparatus and method for gas purification

A hydrocarbon adsorbent that includes a zeolite with either a H-FER structure or a MOR structure in which the pore diameter has been adjusted by ion exchange. A propane adsorbent that includes a zeolite with a MFI structure. A hydrocarbon removal unit that includes a TSA pre-purification unit having a column packed with sequential layers of activated alumina, a NaX zeolite, and the hydrocarbon adsorbent. A method of reducing the hydrocarbon content within liquid oxygen inside a cryogenic air separation unit that includes purifying feed air with the above pre-purification unit.

A method of activating a molded Cu-ZSM5 zeolite adsorbent of the present invention includes: oxidizing a molded product of Cu-ZSM5 zeolite in the flow of air or a gas having an equivalent oxidizability to the air at a temperature of 250&#xb0; C. to 550&#xb0; C.; and then heat-treating the molded product of the Cu-ZSM5 zeolite in vacuum or the flow of an inert gas at a temperature of 550&#xb0; C. to 800&#xb0; C. According to the present invention, an adsorbent whose adsorption performance is not deteriorated can be obtained in the case where a molded product is produced using Cu-ZSM5 zeolite.

Molded Cu-ZSM5 zeolite adsorbent, method of activating the same, temperature swing adsorption apparatus, and method of purifying gas

A method of restarting a TSA apparatus includes, in the case where the TSA apparatus was stopped when or after when a temperature of a purge gas which flows out from a first adsorption column () during a regeneration process became a peak temperature, in the first adsorption column (), closing an entrance valve, an exit valve, and an atmosphere-releasing valve; in a second adsorption column () during an adsorption process, closing an entrance valve and an exit valve and opening an atmosphere-releasing valve so as to release a gas in the opposite direction to feed air flow, followed by closing the atmosphere-releasing valve; pressurizing, just before a restart, the second adsorption column () with feed air to a pressure necessary for the adsorption process; and performing, after the restart, the regeneration process and the adsorption process continuously from the time point of stopping the TSA apparatus.

Method of restarting feed air purifier

A gas separation method is provided in which, when separating a first component and a second component from a mixed gas containing a plurality of components by using a pressure swing adsorption method, these components can be efficiently recovered and cost reduction can be achieved. Between an adsorption step and a regeneration process step, which use a first adsorption column containing a first adsorbent on which the first component is less readily adsorbable and the second component is absorbable, and a second adsorption column containing a second adsorbent on which the first component is readily adsorbable and the second component is less readily adsorbable, an equalization depressurization step and an equalization pressurization process step, in which the pressure of the first and second adsorption columns is equalized, is carried out.

Gas separating method

Component contained in a gas mixture can be separated based on a PSA method and recovered with high purities at the same time, the system is simple, the system cost is low, and the operation is easy and may be used for separating oxygen and nitrogen from air or for separating noble gases and nitrogen from a gas mixture containing noble gases and nitrogen, and obtaining each gas as a product.

Method and system for separating gas

A gas separation method and apparatus that recovers efficiently principal gas components from a feed gas that includes a plurality of components, and enables supplying the product gases continuously at a stable flow rate and component concentration. A first separation step using a first adsorption column and a second separation step using a second adsorption column are provided, a circulating feed gas, consisting of the recovered exhaust gases discharged in each of the steps and the feed gas, is used as a gas to be separated. The outflow rate and component concentration of a second gas product are maintained constant by controlling the outflow rate of the first gas product.

Gas separation method and device

An adsorbent for separating nitrogen from a mixed gas of oxygen and nitrogen is MSC wherein an oxygen and nitrogen separation ratio &#x3b1; and a ratio (t/t) of a time trequired for adsorbing 50% of the oxygen equilibrium adsorption amount and a time trequired for adsorbing 95% of the oxygen equilibrium adsorption amount satisfy the inequality()&#x3c;&#xd7;(&#x3b1;&#x2212;)&#x3b1;&#x2267;The amount of adsorbent used with respect to a predetermined amount of nitrogen generated can be reduced since a method is carried out which uses this adsorbent to produce nitrogen by separating nitrogen from the mixed gas of oxygen and nitrogen by means of a PSA method. By this method, it is possible to reduce the cost of the apparatus and reduce and miniaturize the scale of the apparatus, and the power consumption amount can be reduced.

Adsorbent for separating nitrogen from mixed gas of oxygen and nitrogen

An apparatus and a method for purifying the air used in cryogenic air separation are described, which are capable of effectively removing nitrogen oxides and/or hydrocarbons. The apparatus comprises an adsorber comprising an adsorption cylinder that has a first adsorbing layer and a second adsorbing layer therein. The first adsorbing layer is composed of a first adsorbent capable of selectively adsorbing water in the air. The second adsorbing layer is composed of a second adsorbent capable of selectively adsorbing nitrogen oxide and/or hydrocarbon in the air passing the first adsorbing layer, wherein the second adsorbent comprises an X zeolite containing magnesium ion as an ion-exchangeable cation.

Apparatus and method for purifying air used in cryogenic air separation

CMS adsorbents having suitable indexes are used to improve greatly the performance of nitrogen-producing apparatuses where nitrogen is obtained from the air with a PSA method, so as to improve the efficiency of nitrogen production. A nitrogen PSA apparatus is formed with two adsorbing columns where an adsorption step and a regeneration step are performed alternatively and periodically. The adsorption step is for adsorbing oxygen and conducting nitrogen to a product tank with the supply of compressed air from an air compressor, and the regeneration step for releasing the adsorbed gas after the adsorption step. The adsorbing columns are filled with a carbon molecular sieve (CMS) that selectively adsorbs oxygen as an adsorbent. The CMS adsorbs an oxygen/nitrogen amount of 50% of the saturated adsorption amount with a period TO/TN starting from oxygen/nitrogen supply, wherein TO is 5&tilde;10 seconds and TN is larger than TO by more than 41 times.

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Yokohama, Japan

Masato Kawai