Process and apparatus for the separation of two gaseous streams each containing carbon monoxide, hydrogen and at least one acid gas

An apparatus for separating two gaseous streams, each containing at least one acid gas, carbon monoxide and hydrogen to remove carbon monoxide and hydrogen comprising:

• a first acid gas removal absorber, a first temperature swing adsorption unit, a separation unit, a means for sending a first gaseous stream containing at least carbon monoxide, hydrogen and at least one acid gas to be purified in the first acid gas removal absorber to remove at least one acid gas, a means to send gas purified in the first acid gas removal absorber to be purified in the first temperature swing adsorption unit to remove at least carbon dioxide and means to send gas purified in at least carbon dioxide from the first temperature swing adsorption unit to be separated at a cryogenic temperature in the separation unit to produce a stream of fluid enriched in carbon monoxide and a stream of fluid enriched in hydrogen,
• a shift reaction unit, a second acid gas removal absorber, a pressure swing adsorption unit, a means for sending a second gaseous stream containing at least carbon monoxide, hydrogen and at least one acid gas is sent to the shift reaction unit in which carbon monoxide and water vapour in the second stream are converted to carbon dioxide and hydrogen, a means for sending the shifted second stream to be purified in the second acid gas removal absorber to remove carbon dioxide and a means for sending the purified second stream as a feed stream to the pressure swing adsorption unit to produce a hydrogen enriched stream richer in hydrogen than the feed stream,
• and a means for sending at least part of the stream enriched in hydrogen from the separation unit to the pressure swing adsorption unit to produce the hydrogen-enriched stream,
• further comprising a second temperature swing adsorption unit, a means for sending a gas reduced in hydrogen produced by the pressure swing adsorption unit to the second temperature swing adsorption unit where it is purified to remove carbon. dioxide and means for sending the purified gas from the second temperature swing adsorption unit as a feed gas to the separation unit.