Process for the purification of inert gases
AssigneeSinco Engineering S.p.A.
InventorsGuido Ghisolfi, Dario Giordano, Giuseppina Boveri
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Abstract
Process for the purification of inert gases containing impurities of organic nature particularly of gas (nitrogen) coming from solid state polycondensation reactors or polyester resins including the gas treatment with the stoichiometric quantity (or slightly higher) of oxygen as regards the present impurities at a temperature between 250.degree. and 600.degree. C. by using Pt or Pt/Pd catalysts supported on a porous solid and the gas recycling directly to the polycondensation reactor before drying to eliminate the water produced during the reaction of impurities oxidation.
Claims16
Process for the purification from impurities formed of organic compounds of a recycle inert gas stream leaving a solid-state polycondensation reactor of polyester resins comprising adding oxygen or gas containing oxygen to the gas stream, circulating the gas stream on a catalytic bed containing Pt or mixtures of Pt and Pd supported on an inert porous support at temperatures from 250.degree. to 600.degree. C., characterized in that the quantity of oxygen used is stoichiometric with respect to the organic impurities or in such an excess that the gas at the outlet of the oxidation reactor contains up to 10 ppm of oxygen and in that the gaseous stream leaving the oxidation reactor is recycled to the solid-state polycondensation reactor after a drying treatment to remove water present.
Dependencies are inferred from the claim text.