Two stage process for the production of a high benzene aromatic

Details Two stage process for the production of a high benzene aromatic Two stage process for the production of a high benzene aromatic

1987-12-16

1989-02-28

Davis, Curtis R.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Plural serial stages of chemical conversion

208138, 585412, 585417, 585419, C10G 3506, G07C 1200

Patent

active

048082953

ABSTRACT:
A process is provided for converting a feedstock comprising a preponderant amount of C.sub.2 -C.sub.10 aliphatic compounds to a product having a high proportion of benzene in a two stage process, with the effluent from the first stage passing directly to the second stage, i.e., with no intermediate processing such as purification or separation. In the first stage, the feedstock is contacted under suitable conversion conditions with a catalyst comprising an aluminosilicate zeolite having a Constraint Index in the approximate range of 1 to 12 and a degree of acidity indicated by an alpha value of at least about 3. The effluent from the first stage is then passed directly to a second stage where it is contacted under conversion conditions with a catalyst comprising platinum and a zeolite which either has a Constraint Index of approximately 1 to 12 or is a potassium zeolite L in which the number of protonic acid sites have been reduced by exchange with barium, strontium or calcium, the second stage zeolite being substantially non- or low-acid as indicated by an alpha value no higher than about 1.

REFERENCES:
patent: 3756942 (1973-09-01), Cattanach
patent: 3760024 (1974-09-01), Cattanach
patent: 4180689 (1979-12-01), Davies et al.
patent: 4304686 (1981-12-01), Telford
patent: 4350835 (1982-09-01), Chester et al.
patent: 4560820 (1985-12-01), Field
Hughes et al., "Aromatization of Hydrocarbons over Platinum Alkaline Earth Zeolites" in New Developments in Zeolite Science and Technology, Vol. 28, pp. 725-732, (1986).

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