Process and apparatus for removing co2 from a gasification syngas

The process according to claim, wherein all the refrigeration for the low temperature refrigeration of step h) is provided by:

• i) re-vaporization at a lower pressure of the at least two CO2 streams including a re-vaporization of a CO2 stream at a pressure between 5 and 10 bar abs;
• and/or
• ii) by the CO2 closed refrigeration cycle with re-vaporization of CO2 at at least two different pressures including one re-vaporization between 5 and 10 bar abs. and additionally by
• iii) expansion of a hydrogen rich stream from step h, the pressure of the hydrogen rich stream before expansion being below 70 bar abs.

An integrated process for production of energy from natural gas, solid fossil fuels or biomass, comprising the following steps:

• reacting natural gas in a reformer or reacting solid fossil fuels or biomass in a gasifier to form syngas,
• treating the syngas in the process as claimed in claim to produce a CO2 stream and a CO2-depleted tail gas;
• and sending:
• i) the CO2 depleted tail gas, and/or
• ii) a hydrogen enriched stream formed by separating the CO2 depleted gas by pressure swing adsorption as a fuel to a gas turbine to produce energy.

A unit for removing CO2 from a syngas comprising means to remove acid gas from a syngas containing more than 30% mol CO on a dry basis and some H2S and carbonyl sulphide (COS) to eliminate at least most of H2S in a physical absorption unit to reach an H2S content in the purified syngas between 1 and 150 ppm, preferably between 10 and 50 ppm H2S, optional compression means to compress purified syngas to a pressure above 40 bar bas, preferably 50 bar abs or even 60 bar abs, means for heating purified syngas, a saturator for moisturizing the heated syngas to produce heated and moisturized syngas, means for Injecting steam into the heated and moisturized syngas to form a mixture of steam and syngas, at least one shift reactor for subjecting the mixture to water gas shift reaction in at least one water gas shift unit at a temperature greater than 250° C., preferably greater than 300° C., possibly in two consecutive reactors, means for cooling the shifted syngas to form cooled shifted syngas, an adsorption unit for removing H2O and H2S from the cooled shifted syngas by adsorption in any order to produce dehydrated syngas containing less than 20 ppm H2S, preferably less than 5 ppm or even less than 1 ppm H2S, means for separating the dehydrated syngas by partial condensation and/or distillation to form a H2 rich gaseous stream and CO2 rich liquid stream and means for sending the H2 rich gaseous stream as fuel to a gas turbine.