CHEESA, Vol. 4 No. 1 Hal 18-30, 2021 | 18 CHEESA: Chemical Engineering Research Articles ISSN 2614-8757 (Print), ISSN 2615-2347 (Online) Available online at: http://e-journal.unipma.ac.id/index.php/cheesa Copyright © 2021 Pemodelan dan Simulasi Pencairan Gas Alam dengan Persamaan Keadaan Peng Robinson Modelling and Simulation Natural Gas Liquefaction with Peng Robinson Equation of State Lidya Elizabeth 1*) , Okky Indra Putra 2) , Marthen Luther Doko 2) 1) Politeknik Negeri Bandung, D3 Teknik Kimia, Indonesia 2) Institut Teknologi Nasional Bandung, Teknik Kimia, Indonesia *correspondence email: lidya.elizabeth@polban.ac.id Abstrak Gas alam merupakan energi yang ramah lingkungan dibandingkan batu bara dan minyak bumi. Pencairan gas alam memudahkan pengangkutan pada jarak jauh. Tujuan pemodelan dan simulasi pencairan gas alam ini yaitu mengetahui pengaruh temperatur dan tekanan pada masukan kompresor. Simulasi dilakukan secara statis dan dinamis. Metode simulasi pencairan gas alam menggunakan perangkat Matlab dengan persamaan keadaan Peng Robinson dan aturan campuran (mixing rules). Pemodelan statis dilakukan pada temperatur masukan gas alam 298 K dan tekanan 20 atm. Hasil simulasi menunjukkan gas alam mengalami pencairan pada siklus kedua. Temperatur gas alam siklus pertama mencapai 182 K sedangkan kedua 112 K. Pemodelan dinamis memvariasikan temperatur masukan kompresor pada komposisi gas alam tetap dan variasi komposisi gas metana pada temperatur masukan kompresor tetap. Hasil menunjukkan semakin tinggi temperatur masukan kompresor, semakin tinggi temperatur keluaran kompresor akhir dan throttling valve. Pada variasi komposisi gas metana, semakin besar komposisi gas metana maka semakin rendah suhu keluaran kompresor. Kata kunci: gas alam; LNG; pemodelan; persamaan Peng Robinson; simulasi Abstract Natural gas is environmentally friendly energy compared with coal and petroleum. Natural gas liquefaction is carried out to facilitate transportation over long distances. The objective of modelling and simulation natural gas liquefaction was to determine the effect of temperature and pressure on compressor inlet. Simulations were carried out both static and dynamic. The simulation method uses Matlab instrument with Peng Robinson equation of state and mixing rules. Static modelling carried out at inlet natural gas temperature 298 K and pressure 20 atm. The simulation results showed that natural gas liquefied in the second cycle. The temperature of natural gas in the first cycle reached 182 K while second cycle 112 K. Dynamic modelling carried out by varying the compressor inlet temperature with fixed natural gas composition and composition of methane gas variation at fixed compressor inlet temperature. The results showed that the higher compressor inlet temperature, the higher outlet temperature of final compressor and throttling valve. Meanwhile, in the variation of methane gas composition, the higher methane gas composition, the lower compressor outlet temperature. Keywords: LNG; modelling; natural gas; Peng Robinson equation; simulation Received: 12/01/2021; Revised: 24/03/2021; Accepted: 07/04/2021; doi: 10.25273/cheesa.v4i1.8316.18-30 Research Article