Institut Francais Du Pe'trole

Michel Pasquereau

Richard Levesque

Jean-Fran&ccedil;ois Papagni

Laurent Dayde

Xavier Montagne

Jean-Pierre Dumas

Jean-Francedillaois Papagni

A unit for sampling aldehydes and ketones contained in diluted exhaust gases from thermal combustion engines has a specific trapping circuit and a simulation circuit that simulates the specific trapping circuit. The specific trapping circuit and the simulation circuit are arranged in parallel so that the diluted gases can be passed for some time in the simulation circuit ( ) before they are passed into the specific trapping circuit wherein aldehydes and ketones are trapped.

Process and unit for sampling aldehydes and ketones contained in exhaust gases

A process for sampling aldehydes and ketones contained in diluted exhaust gases from thermal combustion engines uses a sampling unit that has a specific trapping circuit and a simulation circuit that simulates the specific trapping circuit. The specific trapping circuit and the simulation circuit are arranged in parallel. The diluted gases are passed for some time in the simulation circuit ( ) before they are passed into specific trapping circuit wherein aldehydes and ketones are trapped.

The present invention is a system for specific pollutants contained in diluted exhaust gases from thermal combustion engines, comprising a first module (1) which samples aldehyde and ketone emissions and a second module (2) which samples hydrocarbon emissions. The system according to the invention further comprises a control which coordinates the sampling(s) with predetermined working phases of the thermal engine. The first module (1) comprises a circuit (3) for trapping the aldehydes and the ketones contained in the diluted exhaust gases and a dilution air sampling circuit (4).

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Sartrouville, France

Michel Pasquereau