Feed naphtha

Hydrofining usually involves only minor molecular changes of the feed with hydrogen consumption in the range of about 100 to 1,000 cu.ft./bbl. Typical applications include desulfurization of a wide range of feeds (naphtha, light and heavy distillates, and certain residua) and occasional pretreatment of cat cracker feeds. 

Yields Typical from Feed various feeds Naphtha LCCO VGO VGO... 

The aromatics complex converts approximately 75% of the feed naphtha to petrochemical aromatics with the vast majority of the remainder being exported as raffinate and some hydrogen. With a modern aromatics complex flowscheme, a little over half of the mixed xylenes are produced in the Tatoray unit while the rest are produced in the CCR Platforming unit directly from the naphtha reforming. Having reviewed the framework of an aromatics complex we are now in a better position to understand the context of the continuous countercurrent liquid adsorptive Parex process which produces the primary aromatics complex product, p-xylene. 

Flow through Reaction System. The feed naphtha was pumped from the oil feed tank, T-1, on scale to the preheater, B-2, and thence to the bottom of the reactor, D-1, which was 45 feet long. 

Table V shows demand ratios of by-products to ethylene that have been projected by Freiling through 1980. Propylene demand will not grow as fast as ethylene, and the present level of 0.59 will reduce to 0.49 lb propylene/lb ethylene, n-Butane, naphtha, or gas oil feed can satisfy this, and thus, in all probability, much of the 30 billion lbs of new ethylene capacity will be from heavier feeds. Naphthas and gas oils are presently economical only in Europe.

Example 5 (Batch pipeline sequencing). Suppose a one-to-one serial pipeline that connects two chemical sites. The provider site prodtices the raw and intermediate materials for the consumer site. Suppose that the consumer site produces Styrene-based chemicals such as Polystyrene and Styrene-Butadiene rubber. Raw materials for Styrene production are Benzene and Ethylene. Among others, a steam cracker provides Ethylene and Pygas, which is subsequently refined to Benzene. It is assumed that the capacities of these plants are unbalanced such that the deficit of Pygas and Benzene has to be imported. Additionally, the cracker feed, Naphtha, has to be imported. 

Atmospheric residue Lube base stock, low-sulfur fuel oil, RFCC feed Naphtha, middle distillates, FCC feed... 

During the 1950s and 1960s the performance of platinum reforming catalysts was considerably improved as operating procedures were optimized. More economic catalysts became available as the platinum content was reduced from more than 0.6 wt% to about 0.35 wt% and the sulfur content of feed naphtha was considerably reduced. Higher purity alumina supports, with better activity and lower levels of sodium and iron could be synthesized reproducibly. An optimum amount of chloride added to the support limited coke formation. 

Feed/Products Feed Naphtha Light Cyde Oil Bottoms... 

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