Patent GB-951417-A (GB)
Title: Process for the selective removal of hydrogen sulphide from gases
Inventor: BALLY ADRIANUS PETRUS
IPC: C10K1/14
Filed: 1961-06-27
Abstract: In a process for the selective removal of H2S from gas containing H2S and CO2, the gas is treated with an aqueous solution containing one or more dipropanolamines, in which solution CO2 is absorbed in an amount between 0.02 and 0.5 moles per mole of dipropanolamine.  The dipropanolamine may be di-n-propanolamine, n - propanol - iso - propanolamine di - isopropanolamine, and mixtures thereof; preferably a technical dipropanolamine mixture is used, e.g. more than 90% by weight of di-isopropanolamine, and 10% by weight or less of mono- and tripropanolamines.  The dipropanolamine content in the aqueous solution is preferably between 5 and 60% by weight.  The process may be carried out at 0 DEG  to 140 DEG  C., and at elevated pressure. The amine phase may contain other absorbing agents, e.g. diethanolamine.  The example describes the treatment of a gas having a temperature of 14 DEG  C. at a pressure of 10.5 atmos. absolute in a bubble-cap column with a 19% aqueous solution of a technical isopropanolamine mixture, the solution being introduced near the top of the column.  The di-isopropanolamine solution running off the absorption column is regenerated at 0.15 atmos. gauge in a heated column where the gases are stripped from the boiling solution, and the solution is recycled after cooling. Starting materials may be air, gases obtained by complete or partial combustion of oil or coal, oil refining gases, town gas, coke oven gas, water gas, propane and propene. Specification 789,070 is referred to.ALSO:In a process for the selective removal of H2S from gas containing H2S and CO2 the gas is treated with an aqueous solution containing one or more dipropanolamines, in which solution CO2 is absorbed in an amount between 0.02 and 0.5 moles per mole of dipropanolamine.  The dipropanolamine may be di-n-propanolamine, n - propanol - iso - propanolamine, di-isopropanolamine, and mixtures thereof; preferably a technical dipropanolamine mixture is used, e.g. more than 90% by weight of di-isopropanolamine, and 10% by weight or less of mono- and tri-propanolamines.  The dipropanolamine content in the aqueous solution is preferably between 5 and 60% by weight.  The process may be carried out at 0 DEG  to 140 DEG  C., and at elevated pressure. The amine phase may contain other absorbing agents, e.g. diethanolamine.  The example describes the treatment of a gas having a temperature of 14 DEG  C. at a pressure of 10.5 atmos. absolute in a bubble-cap column with a 19% aqueous solution of a technical isopropanolamine mixture, the solution being introduced near the top of the column.  The di-isopropanolamine solution running off the absorption column is regenerated at 0.15 atmos. gauge in a heated column where the gases are stripped from the boiling solution, and the solution is recycled after cooling. Starting materials may be air, gases obtained by complete or partial combustion of oil or coal, oil refining gases, town gas, coke oven gas, water gas, propane, and propene.  Specification 789,070 is referred to.