Sumitomo Seika Chemicals Co., Ltd.

Seitetsu Kagaku Co., Ltd.

Bergwerksverband Gmbh

Kazuo Haruna

Kanji Ueda

Masahiro Inoue

Saburo Hayashi

Hiroaki Sasano

Hitosi Someda

Masanori Miyake

Masaru Uno

Shinichi Kaji

Hiroo Tsuchiya

Kiyokazu Maruta

Hidenori Kuwata

Koichi Shima

Morihiko Yamamoto

Iwamitsu Shiozawa

A double vacuum pump apparatus (Y) includes positive displacement vacuum pumps (A,B) and lines (). Each of the vacuum pumps includes a suction port () and a discharge port (), and a pressure detector () is provided in the vicinity of the suction port () of the double vacuum pump apparatus (Y). The line () connects the discharge port () of the vacuum pump (A) to the suction port () of the vacuum pump (B). The line () has an end (E) and an end (E) that are connected to the connection line (), and includes a buffer tube (Z) and an on-off valve () located between the tube (Z) and the end (E). A pressure detection signal from the pressure detector () is used as an on/off signal for the on-off valve ().

Double vacuum pump apparatus, gas purification system provided with double vacuum pump apparatus, and exhaust gas vibration suppressing device in double vacuum pump apparatus

A process is provided for recovering oxygen-rich gas by enriching gaseous oxygen contained in crude gas by a single-tank PSA process which utilizes a single adsorption tower loaded with an adsorbent. A cycle is repeated including introducing crude gas into the adsorption tower, desorbing unnecessary components from the adsorbent, introducing washing gas into the adsorption tower for discharging the remaining gas from the adsorption tower, and raising the internal pressure of the adsorption tower. The desorbing includes recovering semi-enriched oxygen gas existing in the adsorption tower after finishing of the adsorption for retention in a recovery tank. The introduction of washing gas includes introducing part of the semi-enriched oxygen gas existing in the recovery tank into the adsorption tower as the washing gas. Raising the internal pressure includes introducing the rest of the semi-enriched oxygen gas retained in the recovery tank into the adsorption tower.

Method of recovering enriched gaseous oxygen

Process of recovering oxygen-enriched gas

A method of separating nitrogen-enriched gas is performed by PSA with the use of an apparatus which comprises a plurality of adsorbers (1, 2), a balance tank (3), and a product receiver (4). The method is characterized by comprising the steps of (a) passing, at a predetermined flow rate, high-purity nitrogen gas from the balance tank (3) to an outlet of an adsorber (2) undergoing regeneration; (b) establishing communication between the outlets of both adsorbers (1, 2) through a pressure equalization line while opening the inlets of both adsorbers to atmospheric pressure; (c) after the above step (b), causing a predetermined amount of high-purity nitrogen gas in the balance tank (3) to reversely pass via the outlet of the adsorber (2) which is to be switched from regeneration to adsorption while also supplying the crude gas through its inlet.

Method and apparatus for separating nitrogen-enriched gas

A process for producing a high purity oxygen from air by PSA which comprises connecting a first adsorption unit packed with carbon molecular sieve and a second adsorption unit packed with zeolite molecular sieve in series, conducting PSA operation separately in each of the units during the same operation cycle time, accumulating the desorption gas from the first adsorption unit in a receiver and then introducing the resulting desorption gas to the second unit as a raw material gas and to the first unit as a rinse gas.

Process for producing high purity oxygen gas from air

A process for separating a specific component from air which comprises alternately and repeatedly carrying out a step of feeding air under pressure to a non-porous gas separation membrane and suctioning of a permeating gas under vacuum after feeding of air is stopped.

Process for separating gas

A process for recovering an oxygen enriched gas from a mixed gas mainly composed of nitrogen gas and oxygen gas by means of PSA comprising:

Process for recovering oxygen enriched gas

An adsorption apparatus with a good heat recovery and a good noise abatement for separating a gas mixture into its components by pressure swing adsorption comprises a closed vessel having an inlet nozzle for a gas mixture at one end, an adsorbent packed as a bed in the closed vessel and a passage for an unadsorbed gas being vertically provided in the vessel through the adsorbent bed, whose one end is open above the top of the adsorbent bed and whose another end passes through the closed vessel at the inlet nozzle side to the outside.

Adsorption apparatus

An oxygen-enriched gas having an oxygen concentration of, for example, 93% by volume, is produced at a high oxygen recovery rate from a gas mixture containing oxygen and nitrogen as main gas components by pressure swing adsorption, using a set of three adsorption columns, each packed with a zeolite molecular sieve as an adsorbent through a cyclic operation of adsorption under a pressure of from atmospheric pressure to 5,000 mm H.sub.2 O and desorption under vacuum pressure down to the final pressure of 150 mm Hg abs.

Process for producing oxygen-enriched gas

In production of high concentration oxygen by a pressure-swing-adsorption method using air as a raw material, air is introduced into a first step adsorption apparatus packed with a zeolite molecular sieve and is subjected to a pressure-swing-adsorption operation to obtain a non-adsorbed gas comprising oxygen as the major component, argon and nitrogen; the non-adsorbed gas is introduced into a second step adsorption apparatus packed with a carbon molecular sieve and is subjected to a pressure-swing-adsorption operation to separate argon and nitrogen from oxygen as a non-adsorbed gas; and the desorbed oxygen is obtained as high concentration oxygen.

Process for producing high concentration oxygen by a

A process for obtaining high concentration argon from air by means of pressure-swing-adsorption, characterized by passing air through a zeolite molecular sieve-packed adsorption apparatus and a carbon molecular sieve-packed adsorption apparatus in this order, subjecting the air to pressure-swing-adsorption operation independently in the above pieces of adsorption apparatus, thereby obtaining concentrated argon and high purity oxygen simultaneously.

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Kakogawa, Japan

Kazuo Haruna