Process for the removal of acid gases from gas mixtures
In a cyclic process for the removal of acid gases from a feed gas by means of an aqueous alkaline scrubbing solution which is continuously recycled between an absorption zone in which the acid gases are absorbed by the scrubbing solution to form a rich scrubbing solution and a regeneration zone in which the acid gases are desorbed from the rich scrubbing solution to form a lean solution, the improvement is described which comprises regenerating the rich solution in a regeneration zone which comprises (1) a steam stripping section and (2) and a flashing section containing at least one flashing stage and an acid gas stripping stage wherein: (a) a first portion of the rich scrubbing solution is passed through the steam stripping section wherein it is regenerated to form a lean solution which is recycled to the absorption zone and a vapor stream containing removed acid gases and steam; (b) a second portion of the rich scrubbing solution is passed through a flashing stage in which the rich scrubbing solution is flashed to remove acid gases and steam therefrom to form a partially regenerated solution; (c) the partially regenerated solution is passed through the acid gas stripping stage in which the solution is countercurrently contacted with and stripped by the vapor stream from the steam stripping section to remove acid gases and steam from the partially regenerated solution; and (d) the lean scrubbing solution leaving the steam stripping section is utilized to heat the solution in the flashing section to form steam which strips additional acid gases from the solution.
- Assignee:
- Union Carbide Corp., Danbury, CT
- Patent Number(s):
- US 4702898
- OSTI ID:
- 5889688
- Country of Publication:
- United States
- Language:
- English
Similar Records
Integrated cyclic scrubbing and condensate stripping process for the removal of gaseous impurities from gaseous mixtures
Integration of stripping of fines slurry in a coking and gasification process