Separation of co2 and h2s from gas mixtures

Abstract

Abstract A PROCESS OF IMPROVED EFFICIENCY AND LOWER CAPTIAL COST FOR SEPARATING CO2 AND/OR H2S FROM GAS MIXTURES USING A REGENERABLE AQUEOUS ALKALINE SCRUBBING SOLUTION WHICH IS CIRCULATED IN A CYCLIC PROCESS BETWEEN ABSORPTION AND REGENERATION STAGES. IN THE ABSORPTION STAGES, AT LEAST A PORTION OF THE SOLUTION REACHES A TEMPERATURE ABOVE THE ATMOPHERIC BOILING TEMPERATURE OF THE REGENERATED SOLUTION. IN THE REGENERATION STAGE AT LEAST TWO SEPARATE REGENERATION ZONES ARE USED OPERATING AT DIFFERENT TEMPERATURES AND CORRESPONDINGLY DIFFERENT PRESSURES. THE HIGHER TEMPERATURE, HIGHER PRESSURE REGENERATION ZONE IS SUPPLIED WITH SOLUTION FROM THE ABSORPTION STAGE WHICH IS AT A TEMPERATURE ABOVE THE ATMOSPHERIC BOILING TEMPERATURE OF THE REGENERATED SOLUTION, WHILE THE LOWER TEMPERATURE, LOWER PRESSURE REGENERATION ZONE IS SUPPLIED WITH A SEPARATE STREAM OF SOLUTION. STRIPPING STREAM FOR THE LOWER TEMPERATURE REGNERATION ZONE IS GENERATED BY REDUCING THE PRESSURE OF THE HOT REGENERATED SOLUTION FROM THE HIGHER TEMPERATURE REGENERATION ZONE. THE PROCESS PERMITS THE EFFECTIVE UTILIZATION OF THE HEAT CONTENT OF HOT FEED GASES AND THE HEAT OF ABSORPTION OF THE ACID GASES, WHICH HEAT SOURCES HAVE BEEN IN PREVIOUS PRACTICE LARGELY WASTED.

Inventors

• 👤 Homer E Benson

Bibliographic Details