Linear alpha olefin production using a tank growth reactor
AssigneeThe Dow Chemical Company
InventorsAllan E. Fowler, Gordon E. White, Steve A. Sims
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Abstract
A method for preparing C.sub.4 to C.sub.10 .alpha.-olefins employing trialkyl aluminum compounds, in a growth zone having a recirculation rate through an external heat transfer zone such that the contents of the zone are recirculated in a period of time sufficient to remove the heat of the reaction using added lower .alpha.-olefins at 100.degree.-150.degree. C., 200-2000 psig, and 5-90 minute contact time followed by displacement with lower .alpha.-olefins in a static mixer zone to free the growth .alpha.-olefins and regenerate the trialkyl aluminum compounds. The growth .alpha.-olefins are separated with all of the lower .alpha.-olefins recycled to the growth and displacement steps.
Claims14
In a process for making C.sub.4 -C.sub.10 .alpha.-olefins wherein an .alpha.-olefin having 2-4 carbon atoms or mixtures thereof and low molecular weight trialkyl aluminum are reacted in a growth reaction zone under growth promoting conditions to provide higher molecular weight trialkyl aluminum and reacting an .alpha.-olefin having 2-4 carbon atoms or mixtures thereof with said higher trialkyl aluminum in a displacement reactor zone under displacement conditions to provide a mixture of C.sub.4 -C.sub.10 .alpha.-olefins, the improvement which comprises providing a growth reaction zone by reacting 2 to 6 moles of .alpha.-olefin per mole of trialkyl aluminum in a tank reaction zone and having a recirculation rate through an external heat transfer zone such that the reaction zone contents are completely recirculated in a period of time sufficient to remove the heat of said reaction zone so as to maintain a substantially constant temperature therein.
A process for making C.sub.4 -C.sub.10 .alpha.-olefins which comprises
- (A) reacting 2 to 6 moles of an .alpha.-olefin having 2-4 carbon atoms or mixtures thereof per mol of trialkyl aluminum in a tank reaction zone under a pressure of 200-2000 psig and a temperature in the range from 100.degree. C. to 150.degree. C. wherein said zone has a recirculation rate through an external heat transfer zone such that the contents thereof are recirculated in a period of time sufficient to remove the heat of said reaction zone so as to maintain a substantially constant temperature therein and to provide a growth product comprising higher trialkyl aluminum,
- (B) reacting an .alpha.-olefin having 2-4 carbon atoms, or mixtures thereof with said growth product in a displacement zone having a temperature in the range from 200.degree. C. to 350.degree. C., a pressure in the range from 0 to 1000 psig and a contact time in the range from 0.1 to 5 seconds, and
- (C) recovering the C.sub.4 -C.sub.10 .alpha.-olefins.
A process for making C.sub.4 -C.sub.10 .alpha.-olefins which comprises
- (A) reacting 2 to 6 moles of ethylene per mol of trialkyl aluminum in a tank reaction zone under a pressure of 200-2000 psig and a temperature in the range from 100.degree. C. to 150.degree. C. wherein said zone has a recirculation rate through an external heat transfer zone such that the contents thereof are recirculated in a period of time from 0.5 to 3 minutes to provide a growth product comprising higher trialkyl aluminum,
- (B) reacting ethylene or butene-1 or mixtures thereof with said growth product in a displacement zone having a temperature in the range from 200.degree. C. to 350.degree. C., a pressure in the range from 0 to 1000 psig and a contact time in the range from 0.1 to 5 seconds, and
- (C) recovering the C.sub.4 -C.sub.10 .alpha.-olefins.
Dependencies are inferred from the claim text.