-The process development by IFP Energies nouvelles (IFPEN)/ENI/Axens of a FischerTropsch process is described. This development is based on upstream process studies to choose the process scheme, reactor technology and operating conditions, and downstream to summarize all development work in a process guide. A large amount of work was devoted to the catalyst performances on one hand and the scale-up of the slurry bubble reactor with dedicated complementary tools on the other hand. Finally, an original approach was implemented to validate both the process and catalyst on an industrial scale by combining a 20 bpd unit in ENI's Sannazzaro refinery, with cold mock-ups equivalent to 20 and 1 000 bpd at IFPEN and a special "Large Validation Tool" (LVT) which reproduces the combined effect of chemical reaction condition stress and mechanical stress equivalent to a 15 000 bpd industrial unit. Dedicated analytical techniques and a dedicated model were developed to simulate the whole process (reactor and separation train), integrating a high level of complexity and phenomena coupling to scale-up the process in a robust reliable base on an industrial scale.

-COSWEET TM , developed for the treatment of COS containing natural gases, is based on a combination of deacidification with any alkanolamine solution and COS hydrolysis on a metal oxide based catalyst. Nearly complete COS conversion is reached, even at a relatively low operating temperature. Coupled with a classical sweetening unit, in which an adapted alkanolamine solvent is used in order to optimise the removal of H 2 S, CO 2 , as well as the H 2 S/CO 2 selectivity, the high catalyst activity and the original integration of the scheme secure the COS removal at minimum extra cost. Benefits on capital and operating expenditures of the plant result both from the reduction of the absorption column and solvent flow rate and from the quality of the acid gas which has positive consequences on the design of the sulfur recovery facilities units, including Claus unit. This paper presents the complete development process approach and the results obtained on COS conversion, the model and simulation tool as well as a case study showing the advantages of coupling COSWEET TM to amine based solvent.Résumé -COSWEET TM : procédé innovant de traitement du gaz naturel combinant une élimination sélective de l'H 2 S et une spécification poussée sur le COS -COSWEET TM , procédé développé pour le traitement du gaz naturel comportant du COS, est une intégration entre un procédé de désacidification à base d'une solution d'alcanolamine et une section catalytique assurant l'hydrolyse du COS à l'aide d'un catalyseur à base d'oxyde métallique. Ce procédé permet d'atteindre des conversions du COS proches de 100 % à basses températures. Lorsque la section catalytique est couplée à une section de désacidification mettant en oeuvre un solvant à base d'une alcanolamine adaptée de telle manière à optimiser l'élimination de l'H 2 S et du CO 2 et également la sélectivité H 2 S/CO 2 , la forte activité du catalyseur et l'intégration originale des deux sections permettent de garantir une spécification sur le COS tout en minimisant les coûts de traitement. Les gains sur les coûts d'investissements et opératoires sont dus non seulement à la réduction de la taille de l'absorbeur et du débit de solvant mais également à la qualité du gaz acide, qui impacte la chaîne soufre en aval, comprenant l'unité Claus.