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REVAMP OF NAPHTHA HYDROTREATING PROCESS IN AN IRANIAN REFINERY

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Author(s): Sepehr Sadighi | S.Reza Seif Mohaddecy | Omid Ghabouli | Majid Bahmani

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 51;
Issue: 1;
Start page: 45;
Date: 2009;
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Keywords: Naphtha treating | Simulation | Optimization | Aspen plus

ABSTRACT
Hydrotreating of naphtha (HDS) is one of the important units in crude oil refineries in whichcompounds such as sulfur, nitrogen, oxygen and metal are removed. A commonly used HDScatalyst is molybdenum–nickel on alumina support. sulfur and nitrogen compounds have beenremoved with hydrogenation in which hydrogen sulfide and ammonia are produced and thenremoved by a flash drum.In this paper, naphtha hydrotreating unit of a target refinery in Iran was studied. Design capacityof unit was 12000 BPSD, but because of increasing gasoline demand, the unit capacity was turnedon 15000 BPSD. It made many difficulties such as increasing pressure drop of air coolers andcorrosion, and decreasing of recycle compressor discharge pressure.To reduce mentioned difficulties, a supplementary flash drum was added to the primary designedseparation process. To show the effect of that, the revamped process was simulated by Aspen Plussoftware. Results confirmed that not only the mentioned problems was removed, but also aconsiderable energy saving was achieved.
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