Naphtha is a hydrocarbon distillate which is the remaining from the process of coal tar or refining petroleum. It is a multifaceted mixture of chemicals that is broken down and converted into other chemicals from catalytic reforming or steam cracking.
Molecular sieves are defined as a material that comprises very minute pores that have a similar size and shape. Because of this property, the smaller molecules of another material can easily pass through, but the larger molecules are blocked just like a sieve. This uniformity in its structure makes this material a great desiccant. In fact, some common examples of this would be activated charcoal/carbon or silica gel. These materials are used as desiccants for gases and liquids adsorbents that have tremendous capacity of adsorption than activated alumina and silica gel desiccant. It is extremely effective at removing water from liquid and gases.
molecular sieve offers a variety of adsorption capacity based on molecular size, sieve crystal surface and shape of the molecule. It is most popular moisture adsorbing solution in industries because of superior adsorption efficiency compared to other moisture adsorption system.
Molecular sieve for naphtha drying are desorbed and hydrocarbons are dehydrogenated and used as desorbing agents.
The present invention relates to the preparation of high octane motor fuel sand more particularly relates to an improved process for upgrading naphtha for use as a blending stock in the preparation of high octane gasoline.
Present octane levels require the use of large quantities of relatively high octane blending stocks such as catalytic naphtha, polymer gasoline, hydrogenate and the like and permit the inclusion of much lesser amounts of light virgin naphtha than were formerly used in gasoline blending. This trendy away from the use of light virgin naphtha as a blending stock has created surpluses of such naphtha at many refineries.
The process of the invention may be further said -by considering a typical application of the process in a commercial refinery processing
The product naphtha fraction obtained from the process has the following composition and octane values:
• Table II Component B./D. Vol. RON RON-H5 Percent Clear cc. TEL
• Isoparains and Cyclics- 6, 200 72 87. 1 100 Olenn 2, 424 28 96. 7 100. 3 8, 624 100 90. 5 100. 1