Experience of commercial units revamp and conversion to Isomalk-2 technology and SI-2 catalyst

JSC GAZPROMNEFT–OMSK REFINERY, RUSSIA

New isomerization unit according to scheme with feed deisopentanization, pentanes and low-branched hexanes recycle was designed under SIE Neftehim, LLC license. It is the largest isomerization unit according to Isomalk-2 technology. It is the first national unit that was designed and constructed according to the Russian technology from start to finish.

SIE Neftehim, LLC issued Design Basis for the unit in 2007. Design and detailed engineering documentation were elaborated by JSC Neftechimproekt, Saint-Petersburg, under the author supervision of SIE Neftehim, LLC. General design contractor is JSC Omskneftechimproekt.

The unit design and construction were performed in a uniquely short period - 3 years. This became possible because detailed engineering documentation elaboration and order of long-lead equipment were carried out as early as during designing stage. Moreover, design engineering was not suspended even despite difficult economic situation in the country.

800 KTA capacity unit was started up in November 2010.

Isomalk-2 unit of Omsk Refinery allows producing isopentane fraction with octane number of 92-93 RON and light isohexane fraction with octane number up to 92.5 RON. The catalyst has not been regenerated so far.


JSC SLAVNEFT–YANOS, RUSSIA

The new isomerization unit with 720 KTA feed capacity includes feed pretreatment and pentane-hexane fraction prehydrotreatment sections besides isomerization section. Naphtha isomerization process is performed according tor feed deisopentanization and low-branched hexanes recycle scheme.

The unit was designed by JSC Neftechimproekt, Russia, Saint-Petersburg. Design Basis for the unit was issued by SIE Neftehim, LLC in 2007. The first construction stage had been completed by 2009. SIE Neftehim, LLC performed author control and approved Design and Detailed Engineering Documentation for equipment, as well as Process Operating Procedure for the unit. Equipment procurement and the unit construction had been completed by August 2011.

The unit was started up in October 2011.

The unit produces hexane isocomponent with octane number of 89-89.5 RON and isopentane fraction with octane number of 92-93 RON. The catalyst has not been regenerated so far.


JSC SARATOV REFINERY, RUSSIA

In view of the necessity to bring commercial motor gasolines quality into compliance with Euro-4 the refinery management made a decision to introduce isomerization process. Feed of the isomerization unit pre-hydrotreatment section is straight-run IBP-70°С fraction from gasoline re-distillation section at Crude Desalter-CDU.

Design Basis was developed by SIE Neftehim, LLC in March 2008. In 2008, JSC Neftechimproekt completed FEED stage. The whole design process was carried out under strict control of SIE Neftehim, LLC.

The unit was started up in March 2013.

Feed unit capacity is 300 KTA. Isomerization process is implemented according to the scheme with feed deisopentanization, n-pentane and low-branched hexanes recycle. The unit produces isocomponent with octane number of 91.5-92.5 RON. The catalyst has not been regenerated.


BUSINESS UNIT KOGALYMNEFTEGAZ REFINERY, RUSSIA

 

In September 2016, small-scale isomerization unit Isomalk-2 was started up. The design works were carried out by Lukoil-Nizhegorodnefteorgsintez Ltd.

The unit was designed and constructed with the participation of SIE Neftehim, LLC. The unit composition includes hydrotreating section and fractionation section. Hydrotreated fraction (IBP-70 °C) is isomerized according to the scheme with low-branched hexanes recycle to produce isomerate having no less than 88 RON.

The unit feed (straight-run naphtha mixture) capacity is 15 KTA.


JSC TANECO, RUSSIA

In March 2018, another successful start-up and commissioning of the new isomerization unit according to Isomalk-2 technology took place. It was designed under SIE Neftehim, LLC license. The unit capacity is 420 KTA of mixed feed.

The light naphtha isomerization unit of section 1800 of JSC TANECO was constructed without using foreign-made equipment. The Basic Engineering Design of the unit was developed by SIE Neftehim, LLC. All operations, including catalyst loading, start-up, commissioning and test run, were performed with the direct participation of SIE Neftehim, LLC experts.

The unit composition includes isopentane fraction recovery section, pentanes and low-branched hexanes recycle section, and fractionation section of raffinate from aromatics recovery unit.

According to the test run results, the commercial isomerate octane number was 92.5 RON, whereas the guaranteed value is ≥ 91.2 RON. The isomerate yield is more than 99.0 wt. % on the reactor section feed.

Thanks to the isomerization unit start-up, JSC TANECO started production of K5 ecological class (Euro-5) motor gasoline in 2018.

You can connect or consult with us regarding isomerization unit operation at your refinery or request a proposal for design and construction of a new unit via contact form or by telephone: +7 861 203 20 20