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US 10,865,164 B2Granted
Process for oligomerization with stage-customized exchange of the oligomerization catalyst
AssigneeEvonik Operations GmbH
InventorsStephan Peitz, Dietrich Maschmeyer, Helene Reeker, Guido Stochniol, Markus Winterberg, Andreas Beckmann
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Abstract
A method includes at least two-stage process for the oligomerization of short-chain olefins in the presence of a catalyst, wherein the regeneration of the catalyst is stage-customized.
Claims14
A process for oligomerization of C3- to C6-olefins, the process comprising:
- reacting a starting mixture comprising C3- to C6-olefins, from which nitrogen-, oxygen- and/or sulfur-containing impurities that act as catalyst poisons have been at least partially removed, in at least two successive reaction stages, wherein each reaction stage comprises at least one reactor and at least one distillation column, wherein each reaction stage uses an oligomerization catalyst, having a composition of
- 15 to 40% by weight NiO,
- 5 to 30% by weight Al2O3,
- 55 to 80% by weight SiO2, and
- 0.01 to 2.5% by weight of an alkali metal oxide,
- wherein the at least one reactor of the first reaction stage is operated isothermally,
- exchanging the oligomerization catalyst in the first reaction stage for a fresh oligomerization catalyst at the latest after 47 months, and
- exchanging the oligomerization catalyst in the second reaction stage for a fresh oligomerization catalyst at the earliest after 48 months to at the latest after 72 months.
5 more elements
A system for oligomerization of C3- to C6-olefins, the system comprising:
- a starting mixture comprising the C3- to C6-olefins, wherein nitrogen-, oxygen- and/or sulfur-containing impurities that act as catalyst poisons are at least partially removed from the starting mixture,
- at least two reaction stages, each of which comprises at least one reactor and at least one distillation column, and
- an oligomerization catalyst, comprising
- 15 to 40% by weight NiO,
- 5 to 30% by weight Al2O3,
- 55 to 80% by weight SiO2, and
- 0.01 to 2.5% by weight of an alkali metal oxide,
- wherein the at least one reactor of the first reaction stage is operated isothermally, wherein the oligomerization catalyst in the first reaction stage is exchanged with a fresh oligomerization catalyst at the latest after 47 months, and wherein the oligomerization catalyst in the second reaction stage is exchanged with a fresh oligomerization catalyst at the earliest after 48 months to at the latest after 72 months.
5 more elements
Dependencies are inferred from the claim text.