Chemistry of hydrocarbon compounds – Saturated compound synthesis – By isomerization
Patent
1990-05-29
1991-06-25
Davis, Curtis R.
Chemistry of hydrocarbon compounds
Saturated compound synthesis
By isomerization
208212, 208216R, 208217, 585748, 585751, C07C 513
Patent
active
050269500
ABSTRACT:
A combined process for hydrotreating and isomerizing a C.sub.4 -C.sub.7 feedstock is simplified and made more efficient by the use of a common hydrogen source and low hydrogen to hydrocarbon ratio in both the hydrotreating and isomerization steps of the invention. The method supplies hydrogen to a combined hydrotreatment and isomerization process for the isomerization of a feed stream comprising C.sub.4 -C.sub.7 hydrocarbons. The hydrocarbon feed stream contains sulfur and oxygen contaminants and is combined with a hydrogen-containing stream in an amount that produces a maximum hydrogen to hydrocarbon ratio of 0.9 stdm.sup.3 m.sup.3 (50 SCFB). The hydrotreater feed is contacted in a hydrotreater reactor with a catalyst comprising a Group VIB metal and a Group VIII metal on an alumina support. Effluent from the hydrotreater passes to a first separator that separates the effluent into a first gas stream comprising hydrogen, hydrogen sulfide and water and a treated stream comprising hydrocarbons having from 4-7 carbon atoms. The first gas stream is rejected from the process. The treated stream is mixed with a second hydrogen-containing stream in a proportion that produces a hydrogen to hydrocarbon ratio of from 6.3 to 18 stdm.sup.3 m.sup.3 (350 to 1000 SCFB) to form an isomerization zone feed. The isomerization feed is contacted in an isomerization reaction zone with an isomerization catalyst comprising a crystalline alumino-silicate and a Group VIII metal at isomerization conditions. The effluent from the reaction zone enters a stabilizer where it is separated into a product stream of C.sub.4 -C.sub.7 hydrocarbons and a second gas stream which is removed from the process. The common hydrogen supply source and the low hydrogen to hydrocarbon ratios permit operation of the process without hydrogen recycle facilities between the hydrotreatment and isomerization steps and downstream of the isomerization reactor.
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patent: 3791960 (1974-02-01), Davies et al.
patent: 4627910 (1986-12-01), Millman
Haizmann Robert S.
Schmidt Robert J.
Davis Curtis R.
McBride Thomas K.
Tolomei John G.
UOP
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