L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

Liquid Air Engineering Corporation

Teisan, K.k.

L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

Teisan Kabushiki Kaisha

Air Liquide Japan, Ltd.

Naohiko Yamashita

Bao V Ha

Takao Yamamoto

Francois Venet

Sophie Gastinne

Takashi Nagamura

A mixed gas concentration regulating method and a concentration regulating apparatus, in which the maintenance of the recovery of an easily permeable gas and the restraint of the power expense are compatible. The mixed gas concentration regulating apparatus which includes a pressure raising line having boosters for raising the pressure of a mixed gas having two or more gases different in permeability, a line for leading out a part of the mixed gas from the pressure raising line, a gas separation section for separating the gas fed from the line to a permeate gas and a retentate gas by gas separation membranes, and a line for introducing the permeate gas into the pressure raising line, wherein the gas separation section includes plural stages the respective stages being connected with each other by a line for feeding a retentate gas of the preceding stage to a gas separation section of the succeeding stage and lines are provided for introducing permeate gases of the respective stages into the pressure raising line separately or after they are joined, and the pressure difference of the pressure raising line is utilized so that the pressure ratio on the feed side and permeation side is made larger as in the gas separation section of the latter stage side.

Mixed gas concentration regulating method and concentration regulating apparatus

An object of the present invention is to provide a method for recovering a gas using a semipermeable membrane in an apparatus having a simple structure. The method is capable of maintaining a purity of a product gas at a constant value even if a feed amount of a feed stream is fluctuated. A feed stream G,is a gas mixture of a fast gas having a relatively high permeability to a membrane,and a slow gas having a relatively low permeability to the membrane,The feed stream G,is pressurized by a compressor,and fed to a membrane,separation unit,having the membrane,. Part G,of the permeate stream on the permeate side of the membrane,is recirculated to the upstream side of the compressor,through the first recirculation line,and merged into a stream of the feed stream G,Simultaneously, another part of the permeate stream G,on the permeate side of the membrane,is recovered through a product gas recovering line,In this manner, a product gas G,having a fast gas increased in concentration is obtained.

Method and apparatus for recovering a gas from a gas mixture

Method and apparatus for purification of argon

An air separation process wherein a nitrogen enriched fraction is withdrawn from the distillation column, a portion of which is compressed and recycled through the lowest positioned reboiler in the column and directed to an upper portion of the column as reflux.

Process for the production of nitrogen by cryogenic distillation of

A process for producing gaseous nitrogen from a mixture to be treated in a distillation column, said mixture comprising nitrogen and oxygen, said process comprising the steps of:

The invention concerns the separation of air with an external cold source. An internal cold source is provided to supply cold heat to a compressed inert gas by expansion of a part of a liquefied inert gas when the cold from the external cold source proves to be insufficient. This part of the liquefied inert gas is combined with recycling and compressed gases. The desired production of liquid oxygen and nitrogen is thus assured in spite of variations in the external cold source.

Growing community of inventors

Kobe, Japan

Naohiko Yamashita