Abstract
Steam-cracking is energetically intensive large-scaled process which transforms a wide range of hydrocarbons feedstock to petrochemical products. The dependence of products yields on feedstock composition and reaction conditions has been successfully described by mathematical models which are very useful tools for the optimization of cracker operation. Remaining problem is to formulate objective function for such an optimization. Quantitative criterion based on the process economy is proposed in this paper. Previously developed and verified industrial steam-cracking semi-mechanistic model is utilized as supporting tool for economic evaluation of selected gasoline feedstock. Economic criterion is established as the difference between value of products obtained by cracking of studied feedstock under given conditions and the value of products obtained by cracking of reference feedstock under reference conditions. As an example of method utilization, optimal reaction conditions were searched for each of selected feedstock. Potential benefit of individual cracking and cracking of grouped feedstocks in the contrast to cracking under the middle of optimums is evaluated and also compared to cracking under usual conditions.
Highlights
One of the most intended research group, Dente et al [11, 12] used mechanistic principles to create a detailed model of steam-cracking using minimum of simplifying assumptions
Analysis of CV depending on coil outlet temperature with other parameters remaining constant for the reference feedstock is shown on the Figure 1
The yields of important products obtained by cracking of reference gasoline on the GK6 reactor in dependence on coil outlet temperature is shown on the Figure 2
Summary
One of the most intended research group, Dente et al [11, 12] used mechanistic principles to create a detailed model of steam-cracking using minimum of simplifying assumptions. By including more modelling tools (such as coke-formation description, etc.) they created SPYRO® model which is industrially usable. Another group of researches [13] published their ethane cracking model which is based on detailed and fully mechanistic description of the cracking kinetics using theoretical tools for kinetic parameters estimation. This study is aimed at the application of previously developed model PYROL to the optimization of cracking unit operation with gasoline feedstock and with respect to market values of cracking products. Model PYROL development documentation and technical details including implementation and model parameters tuning has been reported in sufficient details in our previous papers [16,17,18]. Especially mutual reactions of light species (H2-C4), are described by enhanced version of well-established system of formal molecular reactions firstly introduced by Van Damme et al [19] as it is documented in our previous papers
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