Aromatics production Process Flow Scheme Collection 3

CCR Platforming process The CCR (Continuous Catalytic Reformer) Platforming process is used throughout the world today in the petroleum and petrochemical industries. It produces aromatics from naphthenes and paraffins, either for use in motor fuel or as a source of specific aromatic compounds. In aromatics applications, the feed naphtha is generally restricted to C6 through C9 compounds to maximize the production of benzene, toluene, and xylenes.

An aromatics complex is a combination of process units that can be used to convert petroleum naphtha and pyrolysis gasoline (pygas) into the basic petrochemical intermediates: Benzene Toluene and Xylenes (BTX). Benzene is a versatile petrochemical building block used in the production of more than 250 different products.

The Cyclar process converts LPG directly to a liquid aromatics product in a single operation. The reaction is best described as dehydrocyclodimerization, and is thermodynamically favoured at temperatures higher than 425°C. The dehydrogenation of light paraffins (propane and butanes) to olefins is the rate limiting step. Once formed, the highly reactive olefins oligomerize to form larger intermediates, which then rapidly cyclize to naphthenes. These reactions, dehydrogenation, oligomerization, and cyclization, are all acid catalyzed.

The RZ Platforming unit configuration is similar to other fixed bed platforming units. Treated naphtha feed is combined with recycle hydrogen gas and heat exchanged against reactor effluent. The combined feed is then raised to reaction temperature in the charge heater and sent to the reactor section. Radial-flow reactors are arranged in a conventional side-by-side pattern. The predominant reactions are endothermic, so an interheater is used between each reactor to reheat the charge to           reaction temperature. 

The Isomar process is used to maximize the recovery of a particular xylene isomer from a mixture of C8 aromatic isomers. The Isomar process is most often applied to para-xylene recovery, but it can also be used to maximize the recovery of ortho-xylene or meta-xylene. In the case of para-xylene recovery, a mixed xylenes feed is charged to a Parex process unit where the para-xylene isomer is preferentially extracted.

The Tatoray process is used to selectively convert toluene and C9 aromatics (A9) into benzene and xylenes. In a modern aromatics complex, this process is integrated between the aromatics extraction and xylene recovery sections of the plant. Extracted toluene is fed to the Tatoray process unit rather than being blended into the gasoline pool or sold for solvent applications.

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