To conquer the current FLNG challenge, experts have to answer the question " What effect does the movement of the ship have on the amine process?". It is necessary to rely on accurate knowledge of the impact of the floating support movement on the towers operation, to first secure then optimize the design of the process units. Indeed both flooding and internals efficiency will significantly impact the towers sizing (diameter and height) and thus the whole FLNG project. It is a complex problem to be able to take into account the multitude of factors such as liquid viscosity, height of packing, diameter of column, acceleration, liquid/gas flowrate, type of packing, and motions imposed on the system. After first years of work when they completed an extensive review of bibliographic data to build an early model of maldistribution based on a theoretical approach, Total, Prosernat and IFPEN have now performed more than one year research and development at Heriot-Watt University to model mass transfer and hydraulics of a tilting, moving tower. To assess the impact of experimental column diameter and to be in position to scale-up the results, two columns have been used and will be described. The program has included both static and motion tests with varying periods and angles, at different liquid loads to map the distortion of liquid distribution at adjustable heights of packing. The data now acquired has shown, depending on operating conditions, a significant impact on liquid distribution in the packing bed, leading to differentiated wetted zones, including dry and overloaded areas. Some examples will be given to illustrate the impact on tower efficiency and the corresponding tower oversizing based on the results of test campaign.
-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.
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