Loading patent…
AssigneeMitsubishi Chemical Corporation
InventorsYoshitaka Araki, Takashi Ishikawa, Hirofumi Nakamura, Akio Tsuboi, Yoshiaki Nanba, Takeshi Okano, Takayuki Aoshima, Shinji Iwade
Estimating the term…
An oligomerization of .alpha.-olefins is carried out in a solvent using a chromium-based catalyst system comprising at least (a) a chromium compound, (b) at least one nitrogen-containing compound selected from amines, amides and imides, and (c) an alkylaluminum compound, and the catalyst components and by-product polymers are recovered simultaneously from the reaction solution. Such process is an industrially advantageous process for producing .alpha.-olefin oligomers by using a chromium-based catalyst, and is simple and capable of efficiently recovering the by-product polymers and the catalyst components simultaneously.
A process for producing an .alpha.-olefin oligomer using a chromium-based catalyst system comprising at least(a) a chromium compound, (b) at least one nitrogen-containing compound selected from the group consisting of amines, amides and imides, and (c) an alkylaluminum compound, which process comprises carrying out an oligomerization reaction of an .alpha.-olefin in a solvent, and recovering the produced .alpha.-olefin oligomer, catalyst components and by-product polymer from the reaction solution, wherein the catalyst components and the by-product polymer are recovered at the same time.
A process for producing an .alpha.-olefin oligomer, which comprises carrying out an oligomerization of an .alpha.-olefin in an oligomerization reactor in the presence of a reaction solvent by using a chromium-based catalyst system comprising at least (a) a chromium compound, (b) at least one nitrogen-containing compound selected from the group consisting of amines, amides and imides, and (c) an alkylaluminum compound, supplying the resulting reaction solution to a degassing tower to recover the unreacted portion of the .alpha.-olefin, supplying the reaction solution from the degassing tower to a product distillation tower, and recovering the produced .alpha.-olefin oligomer as a distillate while concentrating the by-product polymer and the catalyst components and recovering the obtained concentrate as bottoms, wherein the by-product polymer and the catalyst components are maintained in a dispersed state in the reaction solution in the process line from the outlet of the oligomerization reactor to the inlet of the product distillation tower.
Dependencies are inferred from the claim text.