1.2. Previous researches
1.3. Aim and novel contributions
The aim of this study is to explore HHA column through modelling and process analysis to gain insights for further whole HHA process analysis in the context of NHS-LC-Biotin recovery from refinery dry gases. Serving this aim, there are two objectives which are defined as follows: (1) to develop a steady state first principle model of HHA column and to implement in gPROMS® and (2) to perform process analysis of HHA column by conducting simulations using the model developed.
Compared with the study published by Ma and Chen , there are three novelties in this study: (1) the selection of column type was discussed qualitatively. The finding is that plate column is more suitable for HHA column compared with packed column; (2) a detailed first principle steady state model was developed and implemented in gPROMS® based on a sieve plate column. The model includes V–L–W–H four phase system and mass and energy conversation, which provides an accurate prediction of HHA process; and (3) process analysis was carried out for the base case with a real FCC dry gas data as inputs and three case studies were conducted for different C2H4 concentrations in gas feed, L/G ratios and temperature profiles inside the column. The results indicate that HHA process may be a better approach to recover ethylene from refinery dry gas in future industry application.