Simulasi Dan Optimasi Komposisi Pelarut Hibrida Monoetanolamina – Metanol Terhadap Efisiensi Kolom Absorber Unit Sweetening Gas

Abstract

This study examines the effectiveness of mixing MEA (Monoethanolamine) solvent with Methanol in the sour gas purification process, especially to remove CO2 and H2S. The goal is to achieve sweet gas standards for further processing with concentrations that have been set by PT.X, namely H2S < 5 ppmv and CO2 < 5%vol or equivalent to < 50000 ppmv. This study investigates the effect of replacing the chemical solvent in the form of Diisopropanolamian (DIPA) with a mixture of Monoethanolamine (MEA) and Methanol in water with a total variation of 1- 21 wt%, as well as a comparison of only the use of MEA and only Methanol, as well as variations in absorber pressure against various variations in the concentration above. The objective of the study was to obtain the best concentration of MEA+Methanol hybrid solvent mixture as a replacement solvent, in terms of economics. Simulation was conducted using Aspen Hysys V11 with Amine Package. The results show that at a hybrid solvent concentration of MEA + Methanol 15% with a pressure of 442.6 kPa for the HTU unit and 1345 kPa for the RCC unit, it is able to save overall costs (CAPEX + OPEX) compared to the use of chemical solvents in the form of Diisopropanolamine (DIPA) up to Rp1,365,568,590,443.44 / year, while still producing sour content in the form of H2S and CO2 below the desired limitation value. Rp. / year. With the note that the solvent is only able to perform optimal removal (not passing the specified sour content limitation, which is <50 ppmv for H2S and 50000 ppmv or 5% volume for CO2) until the feed sour gas limit is 5x times the existing initial feed sour gas (data from PT.X) for the HTU absorber unit input in terms of streams 1 to 4, and 4x times the initial feed sour gas for the RCC absorber unit in terms of stream 7. As well as pressures around 342.6 kPa for the HTU absorber unit and 1245 for the RCC absorber unit.