Parametric Study Of Hydrodesulfurization And Hydrodearomatization Of Gasoil In Hydrotreating Process Over Como–S Catalyst Using A Pilot Plant Integral Reactor

Abstract

Penyahsulfuranhidro (dirujuk sebagai HDS) dan penyaharomatikanhidro (dirujuk sebagai HDA) bagi Minyak Mentah Ringan telah dijalankan menggunakan pemangkin sulfida CoMo–S di dalam reaktor integral mangkin padat bertekanan tinggi. Kesan daripada parameter–parameter proses utama terhadap kualiti produk telah dikaji dengan mempelbagaikan suhu (200–370°C), tekanan (20 ke 50 bar) dan halaju ruang (1 hingga 4.7 h^-1). Keputusan eksperimen menunjukkan, % aktiviti HDS dipertingkatkan sehingga 81% apabila suhu dinaikkan sehingga 370°C tetapi berkurang sehingga 60% dengan pertambahan halaju ruang sehingga 4.7 h^-1. Selain itu, kputusan juga menunjukkan bahawa kadar % aktiviti HDA dipertingkatkan sehingga 40.6% apabila tekanan dinaikkan hingga mencecah 50 bar. Indeks setana menunjukkan peningkatan sebanyak 1–3 darjah dan graviti bertambah sehingga 1–1.7° API. Implikasi keputusan–keputusan ini terhadap industri penapisan adalah rawatan hidro sederhana terhadap bahan api diesel menggunakan teknologi tahap tunggal tidak memungkinkan loji penapisan tempatan menghasilkan bahan api yang memenuhi spesifikasi semasa (<15 ppmwt) kecuali dengan penyahsulfuran sekali lalu yang mendalam/kuat atau penyahsulfuran sekali lalu dua tahap dengan atau tanpa menumpahkan efluen reaktor pertama. Kata kunci: Bahan api diesel; penyahsulfuranhidro; penyaharomatikanhidro; mangkin CO–MO–S/ Al₂O₃ Hydrodesulfurization (HDS) and Hydrodearomatization (HDA) of a real Straight Run Gas Oil (SRGO) were investigated over CoMo–S sulfide catalyst in a high–pressure fixed–bed integral reactor. The effect of the key process parameters on the quality of product was studied by varying the temperature (200–370°C), pressure (20 to 50 bar) and space velocity (1 to 4.7h^-1). Experimental results revealed that HDS,% activity improved up to 81% when the temperature was increased up to 370°C but reduced to 60% with increase of space velocity up to 4.7 h^-1. It has been also found that the rate of HDA, % activity enhanced up to 40.6% by increasing pressure up to 50 bar. The Cetane index underwent an increase of 1–3 degrees and gravity increased by 1–1.7° API. The implication of these results on refining industry is that mild hydrotreating of diesel fuels using the single–stage technology will not enable local refineries to produce diesel fuel meeting the current specifications (<15 ppmwt) except with severe/deep once–through desulfurization or two–stage once–through desulfurization with or without splitting the first reactor effluent. Key words: Diesel fuel; hydrodesulfurization; hydrodearomatization; CO–MO–S/ Al₂O₃ catalyst