초록 ▼

A method is provided for removing SO2 from gas streams by its gas-phase reaction with a stabilized Criegee intermediate under conditions where a very large excess of water vapor is avoided, resulting in efficient scavenging of SO2 by the Criegee intermediate to form an adduct. The adduct reacts with

A method is provided for removing SO2 from gas streams by its gas-phase reaction with a stabilized Criegee intermediate under conditions where a very large excess of water vapor is avoided, resulting in efficient scavenging of SO2 by the Criegee intermediate to form an adduct. The adduct reacts with water vapor to convert it directly to sulfuric acid, which is then separated from the gas stream. The Criegee intermediate may be generated in a variety of ways.

대표청구항 ▼

A method of removing SO2 from an industrial flue gas, exhaust gas or waste gas stream, which comprises the steps of: (a) determining the moisture content of the gas, and, where the moisture content is more than about 1000 times the SO2 concentration, reducing the moisture content below about 1000 ti

A method of removing SO2 from an industrial flue gas, exhaust gas or waste gas stream, which comprises the steps of: (a) determining the moisture content of the gas, and, where the moisture content is more than about 1000 times the SO2 concentration, reducing the moisture content below about 1000 times the SO2 concentration; (b) contacting the gas stream with an amount of a stabilized Criegee intermediate sufficient to scavenge the SO2 in the gas and form a Criegee-SO2 adduct, the diversion of the stabilized Criegee intermediate by water being less than about 10%; (c) hydrolysing the Criegee-SO2 adduct at an H2O concentration of at least 2 times the initial SO2 concentration, to convert the adduct directly to H2SO4 and oxoalkane; and (d) separating the resultant H2SO4 from the gas stream.