Effect of normal paraffins separation from naphtha on reaction kinetics for olefins and aromatics production. (4th March 2015)

• Record Type: Journal Article
• Authors: Do, Truong Xuan; Lim, Young-il; Lee, Jinsuk; Lee, Woojo
• Is Part Of: Computers & chemical engineering. Volume 74(2015)
• Page Start: 128
• Page End: 143
• Publication Date: 2015-03-04
• Subjects: ATC annualized total cost -- BTX benzene, toluene, and xylene -- CCR continuous catalyst regenerative -- cPCC conventional petrochemical complex -- CR cyclic regenerative -- H-HC heavy hydrocarbons -- L-HC light hydrocarbons -- NCR naphtha catalytic reforming -- NHT naphtha hydro-treating -- NTC naphtha thermal cracking -- n-paraffins normal-paraffins -- non n-paraffins iso-paraffins, naphthenes, and aromatics -- i-paraffins iso-paraffins -- PCC petrochemical complex -- PFD process flow diagram -- rPCC retrofit petrochemical complex with SMB unit -- SMB simulated moving-bed -- SR semi-regenerative; Simulated moving-bed (SMB) -- Reaction kinetics -- Naphtha -- Thermal cracking -- Catalytic reforming -- Petrochemical complex (PCC); Chemical engineering -- Data processing -- Periodicals; 660.0285
• DOI: 10.1016/j.compchemeng.2015.01.002
• Languages: English
• ISSNs: 0098-1354

Abstract

Highlights: A naphtha separation scenario via SMB was studied in a petrochemical complex. 83 chemical reactions of naphtha thermal cracking were proposed. 86 chemical reactions of naphtha catalytic reforming were proposed. Separation of n -paraffins from naphtha increased the olefins production by 14%. Separation of n -paraffins from naphtha increased the aromatic production by 11%. Abstract: The objective of this study is to investigate the effect of the normal paraffins ( n -paraffins) separation by the simulated moving-bed (SMB) on reaction kinetics of the naphtha thermal cracking (NTC) and catalytic reforming (NCR) for the olefins and aromatics production, respectively. First a process simulation of the SMB unit integrated to the petrochemical complex (PCC) was performed. Chemical reaction kinetics of NTC and NCR were proposed and validated. And a retrofit PCC with the SMB unit (rPCC) was compared to a conventional PCC (cPCC) in terms of products composition, flow rate, and energy consumption. It was found that olefins and aromatics yields of NTC and NCR can increase by 14 wt% (41 kt/yr) and 11 wt% (127 kt/yr) for the naphtha capacity of 2475 kt/yr, respectively. However, the total energy consumption of rPCC increased by about 67.8 MW (or 25%) because of the desorbent recovery in the SMB unit.