Addition of Polyvinylpyrrolidone and Synergist Sodium Chloride as Inhibitors of Natural Gas Hydrate Formation with High Carbondioxide Content

• Main Author: Tanjung, Aswad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/38423
• Institution: Institut Teknologi Bandung

Natural gas is used as energy sources and raw material on petrochemical industry. Natural gas is generally transported through underwater pipeline. One of the most frequent problems on underwater pipeline is a blockage on pipeline due to the formation of solid such as hydrate. This blockage of gas pipeline will cause economical losses and safety aspect problem at industry. The method that is widely studied for preventing hydrate formation is the addition of kinetic hydrate inhibitor (KHI) such as poly-vinyl pyrolidine (PVP). The performance of PVP in preventing hydrate formation can be enhance by addition of synergist. This research intend to evaluate the kinetic hydrate formation inhibiting phenomenon (hydrate formation time / induction time) of natural gas with high CO2 content by PVP with addition of NaCl as synergist. This experiment used mixture feed gas composition around 6% CO2 – 37% CH4, at initial pressure 550 psi and temperature 1oC. PVP and NaCl concentration is varied on mass-basis. PVP varied at 0,25%-wt; 0,5%-wt; 1%-wt; and 1,5%-wt. NaCl varied at 1%-wt; 3%-wt; and 6%-wt. The result of this research shows that addition of 0,5%-wt PVP could increase the induction time up to 22 minutes compared to the induction time with no addition of PVP. Each increase of 0,5%-wt PVP into 1,5%-wt PVP could increase the induction time around 20 minutes. The addition of 1%-wt NaCl could not increase the performance of PVP significantly. However, addition of 3%-wt and 6%-wt NaCl could increase the performance of PVP significantly. Moreover, addition of 6%-wt NaCl to 0,5%-wt; 1%- wt; and 1,5%-wt PVP could increse the induction time up to 15 hours.