Chemistry of hydrocarbon compounds – Plural serial diverse syntheses – To produce aromatic
Reexamination Certificate
1999-10-28
2001-08-28
Yildirim, Bekir L. (Department: 1764)
Chemistry of hydrocarbon compounds
Plural serial diverse syntheses
To produce aromatic
C585S323000, C585S413000, C585S475000, C208S064000
Reexamination Certificate
active
06281398
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a process for improving the yield of high octane number gasolines. More specifically, the present invention relates to a process for increasing the yield of high octane gasolines produced during the naphtha reforming step.
Naphtha reforming is a well known process used to improve gasoline quality. The naphtha fraction has a boiling temperature between 80 and 200° C. and essentially contains paraffins, naphthenes and aromatics. The most important reaction occurring during naphtha reforming consists in the dehydrocyclization of the paraffins into aromatics. It is well known that catalytic reforming tends to increase the final boiling point of the reformate (compared to the naphtha) and to favor benzene formation. Moreover these phenomena are more marked since low pressures (about 1MPa or less) and high temperatures are often used. However, among the requirements regarding reformulated gasolines, it is known that the final boiling point of the reformate must be sufficiently low and the benzene content limited.
It has now been discovered that it is possible to significantly improve the high octane gasoline yield and to solve the above-identified problems.
The object of the present invention is to provide a process which increases the high octane gasoline yield, i.e. the intermediate fraction coming from the naphtha reforming step.
SUMMARY OF THE INVENTION
The process of the present invention for increasing the intermediate fraction comprises the steps of:
a. submitting a naphtha feed to a catalytic reformer and contacting said feed with a catalytic reforming catalyst in order to form light, intermediate and heavy fractions;
b. separating said three fractions in a separator and recovering the intermediate fraction.
c. mixing at least a part of the light fraction from said separator with at least a part of the heavy fraction to form a mixture.
d. subjecting said mixture to a transalkylation system to form a second mixture having a new intermediate fraction; and
e. recycling the effluent coming from said transalkylation system into said separator and recovering additional intermediate fractions.
REFERENCES:
patent: 4211886 (1980-07-01), Tabak et al.
patent: 8912613 (1989-05-01), None
Belloir Pierre
Grootjans Jacques
Lamotte Christian
Romers Eric
Fina Research S.A.
Wheelington Jim D.
Yildirim Bekir L.
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