An Approach to Optimize Costs During Ultra-Low Hydrodesulfurization of a Blend Consisting of Different Oil Streams

Abstract

The presence of contaminants in diesel oil is severely controlled. These components affect the diesel properties, causing impacts on the emissions of pollutants and compromising its commercialization. The Brazilian legislation imposes the use of diesel S10. In this work, a hydrotreatment unit fed with multiple diesel streams was optimized using a phenomenological mathematical model. A three-phase model of a tricked-bed reactor was considered. The optimization of the process was performed with the interior point method considering the hydrodesulfurization reaction of diesel. It was proposed to minimize the operating cost, keeping the amount of sulfur in the final product below the maximum allowed value. The EMSO process simulator was used to model, simulate and optimize the hydrotreatment process. It was observed that the optimization strategy drove the contaminant content into the diesel S10 specification range, as well as reducing the process operating cost by increasing the feed temperature and hydrogen flowrate and adjusting the feed composition blend of the available diesel streams.

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“…Bioinsecticides are exploited as potential alternatives to pesticides. The sources of biopesticides are natural organisms, or their metabolic products including insecticidal toxins derived from parasitoids and insect predators as spiders and (Hajek 2004, Chandler et al 2011, Lacey et al2015, Silva et al 2018and King 2019. This study examined the susceptibility of agricultural insect pests, S. lettoralis and S. oryzae, (belonging to two insect orders lepidoptera and coleoptera towards expressed metallopeptidase peptide, astacin, derived from the Adanson's house jumper spider, H. adansoni.…”

“…The conventional hydrodesulfurization (HDS) process used for the removal of sulfur from fossil fuels (petroleum products) which is operated at high temperature and pressure is not so effective in the elimination of sulfur from organosulfur compounds occurring in fossil fuels. Particularly, HDS is not effective in removal of sulfur from recalcitrant organosulfur compounds like Dibenzothiophene (DBT) (Wang et al, 2017;da Silva and Secchi, 2018). To overcome the sulfur dioxide related problems, a new method involving microbes known as Biodesulfurization (BDS) has been developed to remove sulfur content from fossil fuels.…”

Model Predictive Control for Production of Ultra-Low Sulfur Diesel in a Hydrotreating Process

“…The authors considered a single feed diesel HDT process and the assumptions presented in Section 2, with u G = 0.028 cm/s, u L = 1.75×10 -2 cm/s, where u L is the surface velocity of the liquid phase through the TBR, T o = 653 K and P = 5.3 MPa. The steady-state model was validated in the work of Silva and Secchi (2018). The organic sulfur concentration at the exit of the reactor can be seen in Fig.…”

Niobium oxide (Nb2O5) as support for CoMo and NiW catalysts in the hydrodesulfurization reaction of 3-methylthiophene

“…Regarding the hydrodesulfurization process of FCC gasoline, the challenge is to selectively hydrodesulfurize the sulfur species (HDS) and to avoid the hydrogenation of olefins (HYD) in order to preserve the octane number of the fuel (Silva & Secchi, 2018).…”