Transnational Research Associates
The Environmental Advantages
of
Ultra Low Sulfur Diesel
Pretreatment Technology
Art Madsen, M.Ed.
This research report, constituting a position paper promoting SK Corporation’s new sulfur reduction process, intends to discuss and promote a recognized method of hydrocarbon pretreatment that will ensure compliance with new environmental standards enacted in Europe and elsewhere. It is an effective process perfected by SK Corporation designed to yield ultra low sulfur diesel fuel, but its underlying technology can be adapted to other grades of fuels
The processing of hydrocarbons is a complex, technically challenging and costly procedure. There are several objectives that must be achieved to produce industrial-grade diesel fuels. One of these objectives, in this increasingly environmentally conscious world, is attaining acceptably low levels of sulfur when processing petrochemicals and hydrocarbons in today’s oil refineries.
These thoughts, and all
supplemental material to be presented below, are aimed at the petrochemical
engineering staff of Royal Dutch Shell Group, based in the Netherlands (Jacobi,
2001), because this world-scale company is in an excellent position to ensure
widespread implementation of this vital technology.
Brief
Background of Technological Development
It is important, therefore for Royal Dutch Shell engineers to recognize that, according to Kane (2001), SK Corporation of South Korea has perfected a pretreatment process that can be easily incorporated into most refineries. Prior to SK’s invention, diesel fuels were refined without a pretreatment stage and the result yielded a medium to high amount of sulfur. Under pressure throughout the 1970s and 1980s (Ranney, 1975), the European Economic Community, as well as environmental forces in the United States, began to pressure the industry to remove more sulfur, while making sure not to emit excess amounts of CO2. Royal Dutch Shell can play an instrumental role in testing and installing this desulfurization pretreatment technology in Europe and elsewhere.
Discussion
Within Royal Dutch Shell Group, petrochemical and process engineers who are certainly aware of the broad implications of the excess sulfur issue, but who need to be informed of the SK pretreatment solution, are those who should be especially interested in learning about this new process. Such engineering specialists are at the very heart of all technical operations within oil refineries, and especially within Royal Dutch Shell refining operations. They are considered key professional personnel empowered to make major decisions on the basis of their technical expertise. It is highly probable, of course, that they will question the applicability and cost-effectiveness of SK Corporation’s pre-treatment process. Specific questions these engineers might pose include the following:
Royal Dutch Shell Inquiry SK Corporation’s Reply
Has this low
sulfur pretreatment process been proven on an industrial scale? |
Yes, largely in the Netherlands and in Belgium under heavy industrial
conditions. |
Is it
cost-effective; does it fall within EEC cost-parameters? |
Under most circumstances. In instances where it does not,
adaptations can be made. |
Will this
process produce excessive amounts of CO2 a by-product of
producing and using low-sulfur fuels? |
Theoretically, CO2 emissions will be minimal when
desulfurization is begun at the pretreatment stage. |
Where can this
equipment be located within the refinery? |
Virtually anywhere, according to Kane (2001) and SK Corporation. |
How is it
mechanically interconnected with other refinery equipment? |
This varies and is explained in Kane (2001), in Bertelsen
(1998), and on the graphic insert below. |
FIGURE I
The following graphic insert indicates basic pretreatment process stages, providing information to supplement the elementary questions answered above.
It is essential to persuade Royal Dutch Shell’s petrochemical engineers of the efficacy of the SK pretreatment process, partially sketched above, and its ability to comply with EEC standards now calling for 50mg.kg (ppm) of sulfur in diesel fuel, and to do so prior to 2005. According to authoritative sources such as Kane (2001), the SK process is the best of several options for removing sulfur. The Purvin and Gertz report (cited in Perez, 1999) outlines environmental requirements that were not met with any technologies, except presumably the SK process.
Equally important, this
new low sulfur standard will lead to improvement of the air we breathe and will
positively affect even the food we grow.
If other low sulfur technologies under development fail to comply with
US or EEC standards for minimum sulfur content, the consequences could be
catastrophic. Such a possibility would seem to make SK’s proven technology all
the more valuable.
Conclusion
The SK process seems to be the most efficient and cost-effective of all pretreatment technologies available for diesel fuel. Although a complete survey of alternative solutions to the high sulfur problem could not be undertaken in this research report, it is apparent to both SK Corporation’s and Royal Dutch Shell’s petrochemical engineers that the recommended pretreatment process is ideal for ensuring compliance with EEC standards, and those outlined in the Kyoto Protocol (Perez, 1999). It is therefore strongly urged that the technology offered by SK Corporation, as outlined in considerable detail in Hydrocarbon Processing (Kane, 2001), be adopted in Royal Dutch Shell plants across the United States and Europe in order to further prove its efficiency and compliance with environmental standards, in the hope that it will be installed on an even wider scale.
References
Bertelsen, B. (1998, March) MECA supports auto industry’s call for reduction of sulfur
levels in gasoline. Manufacturers of Emission Controls Association, Retrieved from the World Wide Web: http://www.meca.org/aamaspr.html
Chey T.W., President (2001). Sulfur / FCC Oil. S.K. Corporation, Retrieved October 22,
2001 from the World Wide Web. http://eng.skcorp/product/petroleum/hs~petroleum.html
Jacobi, M. (2001, October) Vice President
External Affairs, The Shell Report: Reporting
on our Economic, Environmental and Social Responsibilities. Royal Dutch Shell Group, Retrieved from the World Wide Web, October 27, 2001) http://www.shell.com/royal-en/0,6091,,00.html
Kane, L, Editor (2001, September). Pretreatment Method for Low-Sulfur Diesel.
Hydrocarbon Processing, 34-35.
Nriagu, J. (1998). Sulfur in the environment, Second Edition. New York: Wiley.
Perez, A (1999). Petroleum Downstream Sector Industry
Foundation Paper. Canadian
Petroleum Products Institute (CPPI), Retrieved October 22, 2001 from the World Wide Web. http://www.cppi.ca/publ/industrie.htm
Ranney, M. (1975) Desulfurization of petroleum. Park Ridge, N.J.: Noyes Data
Corporation.
Weirauch, W. (2001, August). HP In Brief: What are costs for further sulfur reductions in
EU fuels? Hydrocarbon Processing, 9.