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Integrated Removal of CO2 and Sulphur Compounds

Typically in partial oxidation plants, the sulphur (up to 7%) and the CO2 compounds are removed in two separate steps; the sulphur removal and the CO2 removal step. In the sulphur removal step, the raw gas is cooled after the gasifier in a waste heat boiler and then scrubbed with a solvent, usually chilled methanol (-30oC) in order to separate a CO2/H2S fraction. The cleaned gases are then saturated with steam before entering the high temperature shift conversion unit. After the shift conversion the CO2 is removed from the shift gas in a conventional CO2 unit (IPTS/EC, 2007 p.82).

In new partial oxidation plants there is an integrated technique for removing CO2 and sulphur compounds in a single step. In this technique, the syngas is cooled after the generator by a direct water quench which also provides the steam needed in the shift conversion process. The cold methanol wash takes place after the shift conversion process and separates the CO2 and sulphur in two different fractions. For this to be possible, a sulphur tolerant shift catalyst is needed as the sulphur is now removed after the shift converter (IPTS/EC, 2007 p.82).

This technique can be applied in new partial oxidation plants.

Development Status Products

Integrated Removal of CO2 and Sulphur CompoundsCosts & Benefits

Parent Process: Partial Oxidation
Energy Savings Potential
CO2 Emission Reduction Potential

Integrated Removal of CO2 and Sulphur Compounds Reference Documents

Reference Document on Best Available Techniques for the Manufacture of Large Volume Inorganic Chemicals - Ammonia, Acids and Fertilisers

Prepared by the Institute for Prospective Technical Studies of European Commision, this document provides detalied information on Best Available Technologies applicable to Ammonia production – as well as on the production of Acids and Fertilizers.  

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