US 6,548,031 B1 · Method for purifying a gas stream

Abstract

The invention relates to a method for purifying a gas stream containing impurities composed of organic compounds, said gas stream flowing out of a reactor (1) designed for solid phase condensation, preferably for aromatic polyesters and polyamides. According to said method, a gas containing at least oxygen is fed to the gas stream containing the impurities. The combined gas stream is then conveyed, at a high temperature, especially from 280° C. to 380° C., onto a catalyst (8) containing rhodium or a rhodium alloy on an inert porous support. It was found advantageous that the amount of oxygen used be hypo stoichiometric, in relation to the organic impurities, and/or that the ratio of oxygen to impurities be controlled by means of a lambda probe (A). Such a lambda probe (A) is used in a facility according to the invention.

Claims10

Dependent claims

An apparatus comprising

a reactor for solid phase condensation of a polyester resin;
an exhaust line extending from said reactor for removing exhaust gas from said reactor;
a catalyzer for receiving a flow of exhaust gas from said exhaust line;
a second line connected to said exhaust line for delivering a flow of oxygen-containing gas into said flow of exhaust gas in said exhaust line upstream of said catalyzer for oxidizing impurities in said exhaust gas within said catalyzer;
a lambda probe for quantitatively analyzing said exhaust gas and emitting a signal corresponding to a measurement of the purity of said exhaust gas, said lambda probe being disposed in one of said catalyzer and said exhaust line downstream of said second line;
and
a processor for receiving said signal from said probe and for controlling the amount of gas delivered from said second line into said exhaust line in dependence on a deviation of said signal from a set signal.

4 more elements

Dependencies are inferred from the claim text.

Method for purifying a gas stream

Life of this patent

Method for purifying a gas stream

Life of this patent

Abstract

Claims10