| 摘要 |
A process and related system for the removal and concentration of a component gas from a stream containing a plurality of gaseous components. The process is directed to the removal and subsequent concentration of a gas stream component in which the component exists as a particularly small percentage (as low as 1 percent or less) of the total stream volume. It is especially appropriate for the removal and concentration of organic and inorganic sulphur gases, such as hydrogen sulphide or sulphur dioxide from effluent acid gas streams. The system is of the regenerative liquid solvent type using an absorber tower and subsequent solvent fractionator. The solvent is injected into the absorber tower where contact is made with the acid gas stream having a component gas, such as the hydrogen sulphide, in relatively small quantity. The component gas is absorbed under closely controlled pressure and temperature conditions. In the case of hydrogen sulphide, the solvent used is preferably N-methyl-2-pyrrolidone which, when saturated is passed to the fractionator column where the hydrogen sulphide is released due to a controlled increase in temperature and reduction in pressure. The hydrogen sulphide is then passed to a separator where free water in the acid stream is accumulated and after which the concentrated hydrogen sulphide is passed to a boiler. There, a portion of the hydrogen sulphide is burnt to sulphur dioxide under controlled conditions. The sulphur dioxide and remaining hydrogen sulphide are then combined in presence of a catalyst and chemically reacted to produce water and commercially high grade elemental sulphur.
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