Improved process and apparatus for the absorption of gas in a liquid

摘要

In a process for absorbing a gas in a liquid under superatmospheric pressure, e.g. sulphur dioxide in weak oleum to produce strong oleum, entrained gas is separated from the liquid leaving the absorber while maintaining superatmospheric pressure, the gas so recovered is returned to the absorber, and the pressure over the liquid is reduced to atmospheric. Liquid from the absorber is led through line 7a into degasifier 15 in which pressure is maintained by a column of liquid in pressure-reducing vessel 18. The cup 16 reverses the direction of flow and separated gas passes through vent 12a back to the absorber. Liquid from vessel 18 overflows through line 20 to a receiver and gas is vented at 13a. In a modification, Fig. 3 (not shown), the degasifier and pressure-reducing vessel are formed in a single vessel by a partition which stops short of the bottom of the vessel.