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

Christophe Jean

Roger Guilard

Brigitte Boisselier-Cocolios

Isabelle Meunier

Laurent Taurin

Method for recovering oxygen from a medium containing O.sub.2 using polynitrogenated compounds that have five coordinating functions which are capable of binding a metal atom, particularly a cobalt atom. In the recovery method, oxygen is first absorbed by the metal complex and then desorbed from the complex and recovered in an appropriate vessel.

Process for recovering oxygen

A method for the synthesis of cyclic polyamines preceeds by reaction of a diamine with the acrylonitrile wherein the reduction steps are carried out with Raney alloy instead of using hydrogen under pressure in the presence of Raney nickel. Compounds so prepared have the formula: ##STR1## wherein A and B are: an alkyl chain --(CH.sub.2)-- in which x is an integer of 2 to 4, substituted or not by an alkyl group of 1 to 5 carbon atoms, which may be substituted or not by an aromatic ring, heterocyclic ring, amine ketone, carboxylic acid, amide, cyano, alkyl, alkoxy, hydroxy, nitro or halogen and R.sub.1 and R.sub.2 are the same moieties as those substituting the alkyl claim above.

Growing community of inventors

Chenove, France

Christophe Jean