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

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

Other

Université Des Sciences Et Technologies De Lille

Ecole Nationale Superieure De Chimie De Lille

L&prime;air Liquide-societe Anonyme a Directoire Et Conseil De Surveillance Pour L&prime;etude Et L&prime;exploitation Des Procedes Georges Claude

Universite Des Science Et Technologies De Lille Cite Scientifique

Ecole National Superieure De Chimie De Lille

Gilles Lagrange

Pascal Del Gallo

Jean-Claude Boivin

Gaetan Mairesse

Roger Guilard

Panayotis Cocolios

Franck Denat

Ahmad Mehdi

Lucie Prost

Jacques Fouletier

Michel Kleitz

Isabelle Hibon

Catherine Reye

Robert J Corriu

Bruno Roux-Fouillet

Philippe Labrune

Claude Chuit

Guy Nowogrocki

C&eacute;sar Marlu Steil

Marlu Cesar Steil

G&eacute;rard Dubois

St&eacute;phane Brandes

Fr&eacute;d&eacute;ric Barbette

Ga&euml;tan Mairesse

A novel compound which can be used in the field of separation and purification of gases is disclosed. The compound can be incorporated into a silica gel incorporating polyazacycloalkane structural units for separating a predetermined gas from a mixture of gases. The mixture of gases is brought into contact with a metallated hybrid gel under conditions which make possible the absorption of the gas to be separated, followed by a phase of desorption of the attached gas, and the recovery of the gas.

Silica gel incorporating polyazacycloalkane structural units

The invention concerns a method for preparing polyazacycloalkanes immobilised on a silica gel from a polyazacycloalkane of formula (A) in which: R and R represent a hydrogen atom, an alkyl radical, or a &lsqb;hetero(aryl)&rsqb;alkyl radical; W , W and W represent a radical of formula (B): &mdash;&lsqb;(CT T ) &mdash;&lsqb;N(R )&rsqb; &mdash;(CT T ) &rsqb; &mdash; such as defined in the description; R represents a hydrogen atom, an alkyl radical or a &lsqb;hetero(aryl)&rsqb;alkyl radical, provided that the polyazacycloalkane ring of the compound of formula (A) comprises not more than 30 cyclic carbon atoms, and not more than 6 cyclic nitrogen atoms. The invention is characterised in that: (a) the compound of formula (A) is reacted with a compound of formula (C): Z&mdash;R &mdash;Si(X )(X )(X ), such as defined in the description to form a compound of formula (D); (b) said compound of formula (D) is condensed on the silanol sites of a silica gel to form the immobilised polyazacycloalkane of formula (E); and (c) some ethanol sites having not reacted are, if required, protected by Z&prime;, a group protecting the hydroxyl function. The invention is useful for separating oxygen from air.

Method for preparing polyazacycloalkanes grafted on silica gel and use of grafted compounds

Provided is a device for treating a food product in order to reduce or eliminate the detrimental effects of the presence of oxygen which is in contact with the external surface of the product. The device includes a vat provided with a hood, containing a food product whose free surface is in contact with the atmospheric air, a solid electrolyte membrane, each face of the membrane being connected to an electrode, each electrode being connected to a current generator, a heater for making the electrolyte operate at the desired working temperature, a pump for discharging oxygen extracted, by the solid electrolyte, from the atmospheric air present above the food product, in a pipe, a pump for circulating the atmosphere to be treated, an oxygen analyzer for measuring the oxygen level in the gas atmosphere above the food product, a control unit for modifying the operation of the solid electrolyte as a function of the oxygen level and the gas atmosphere to be treated and the recirculation rate of the atmosphere and, optionally, a cooling unit.

Device for reducing the oxidation of food products

A process for preparing a solid composite electrolyte comprising at least one compound of the BIMEVOX family is provided. The process comprises at least one step of preparing a mixture of one or more compounds of the BIMEVOX family with one or more chemically inert compounds, at least one step of compacting the mixture obtained, and at least one sintering step during which the temperature reached, over a nonzero time interval, has a value greater than the optimum sintering temperature for the compound of the BIMEVOX family.

Process for preparing a composite electrolyte based on BIMEVOX and the use of said compound in separating oxygen from a gas mixture

A process is provided for treating food products in order to reduce or eliminate the detrimental effects of the presence of oxygen in the atmosphere which is in contact with the products and, more particularly, the external surface of the products. A non-zero quantity of oxygen is extracted from the atmosphere by implementing a solid electrolyte which is an O,ion conductor and is essentially impermeable to the gases. The invention has applicability to preserving frying oil baths.

Process for reducing the oxidation of food products by electrochemical extraction of oxygen

A control device for operation of a system for treating a surface of a solid running substrate by dielectric-barrier electrical discharge in a controlled gaseous atmosphere, comprising (A) a system which includes (i) a treatment device through which a substrate to be treated runs at a speed, (ii) the system is connected to the treatment device for supplying the treatment device with a flow of gas, (iii) the system is connected to the treatment device for supplying the treatment device with electrical power in order to produce the electrical discharge and (iv) the system sucking out the gas, (B) a data processing unit capable of receiving, as input, a datum regarding the speed at which the substrate is running through the treatment device, the data processing unit further comprising an output side connected to the system for controlling the electrical power supply system, in order to regulate the flow of gas delivered by the or each of the gas supply system and/or the electrical power delivered by the electrical power supply system to the device as a function of the speed at which the substrate is running through the treatment device, so as to obtain a surface treatment of the substrate with an equivalent quality whatever the speed at which the substrate is running through the treatment.

Control process and device for treating the surface of a solid substrate

Process for separating oxygen from a gas mixture containing it employs a solid-electrolyte electrochemical cell, where the cell includes a homogeneous structure of one or more BIMEVOX derivatives, with dynamic electrodes created 'in situ' that are reversible and self-adaptive, and at least two current collectors.

Process for separating oxygen from a gaseous mixture containing it and

A control device for operation of a system for treating a surface of a solid running substrate by dielectric-barrier electrical discharge in a controlled gaseous atmosphere, comprising (A) a system which includes (i) a treatment device through which a substrate to be treated runs at a speed, (ii) the system is connected to the treatment device for supplying the treatment device with gas, (iii) the system is connected to the device for supplying the treatment device with electrical power in order to produce the electrical discharge and (iv) the system for sucking out the gas (B) a data processing unit designed to receive, as input, a datum regarding the speed at which the substrate is running through the treatment device, the data processing unit being connected, on the output side, to the gas supply system, to the electrical power supply system and to the gas suction system, in order: (a) upon starting the treatment device and when the running speed of the substrate is greater than a predetermined speed, to carry out the following actions: initiate operation of the suction system, initiate operation of the gas supply system, initiate operation of the electrical power supply system, and (b) upon stopping the device and/or when the running speed of the substrate drops to a level below a predetermined speed to carry out the following actions: interrupt operation of the electrical power supply system, interrupt operation of the gas supply system, and interrupt operation of the suction system.

Electrochemical cell and its use for the separation and the

Electrochemical cell and its use in the separation or electrochemical

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Gilles Lagrange