Due to its wide range of applications, natural gas plays an important role in the global energy matrix. In Brazil, the discovery of the pre-salt transformed the country s history in relation to oil and gas exploration. However, the gas found there has large amounts of associated CO2, which require removal because there are ANP standards that limit commercialized natural gas to 3 percent mol. Several technologies have proven capable of achieving this removal, but for high amounts of CO2, membrane technology has been on the spotlight on offshore oil extraction platforms. Its reduced footprint is a major attraction, due to the limited space on the platforms. The present work compares the occupied area and volume and the total weights of 3D arrangements of hollow fiber and spiral wound membrane modules for the separation of CO2 from natural gas in the Brazilian pre-salt. To achieve this, 3D models were built in Solidworks (trademark) software, based on real offshore plants in operation and data provided by leading membrane module suppliers, in an attempt to achieve results closer to reality. It was found that hollow fiber modules offer significant advantages over spiral wound modules in relation to the membrane area of the individual module (8,340.91 m2 vs 26.24 m2 ) and the number of modules required (48 vs 15,120), and also in relation to complete plants, both in area and volume, as well as in weight. A complete hollow fiber module plant would occupy only 7.75 percent of the volume of the spiral wound module plant. The weight of the first would total 38.42 t as opposed to 765.62 t of the second plant.