Abstract: The invention relates to a process for oligomerization of ethylene, preferably for selective trimerization of ethylene to hex-1-ene, comprising simultaneously bringing ethylene into contact with the components of a catalytic composition based on chromium.

Abstract: The present invention relates to a process for treating an effluent obtained from an oligomerization step in a vaporization step. In particular, the oligomerization step is a step for dimerization of ethylene to 1-butene with a nickel-based catalytic system.

Abstract: The invention pertains to a composition that comprises at least one chromium precursor, at least one heteroatomic ligand, and, optionally, at least one activator. The invention also pertains to the method for preparation of the composition in accordance with the invention and the use of said composition in a method for oligomerization of olefins.

Abstract: The invention concerns a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II), at least one phosphine ligand with formula PR1R2R3 in which the groups R1, R2 and R3, which may be identical or different and which may or may not be bonded together, and at least one Lewis base, said composition having a molar ratio of the phosphine ligand to the nickel precursor of less than or equal to 5 and a molar ratio of the Lewis base and phosphine ligand together to the nickel precursor of greater than or equal to 5.

Abstract: A process for the dimerization of ethylene to 1-butene, carried out with a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II), at least one phosphine ligand with formula PR1R2R3 in which the groups R1, R2 and R3 may be identical or different and which may or may not be bonded together, and at least one activating agent selected from the group formed by chlorinated and brominated hydrocarbylaluminium compounds, used alone or as a mixture, the composition having a molar ratio of the phosphine ligand to the nickel precursor in the range 5 to 30 and a molar ratio of the activating agent to the phosphine ligand greater than or equal to 1.

Abstract: The invention describes a novel catalytic composition comprising at least one nickel precursor A with at least one diphosphinamine ligand B1 of formula (R1)(R?1)P—N(R3)—P(R2)(R?2) or an iminobisphosphine ligand B2 of formula (R3)N?P(R1)(R?1)—P(R2)(R?2) or an iminobisphosphine ligand B?2 of formula (R3)N?P(R2)(R?2)—P(R1)(R?1). The invention also describes the use of said catalytic composition in a method for the oligomerisation of olefins.

Abstract: The invention pertains to a composition that comprises at least one chromium precursor, at least one heteroatomic ligand, and, optionally, at least one activator. The invention also pertains to the method for preparation of the composition in accordance with the invention and the use of said composition in a method for oligomerization of olefins.

Abstract: The invention concerns a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II) containing a phosphine ligand complexed with nickel, at least one Lewis base, and at least one activating agent selected from the group formed by chlorinated and brominated hydrocarbylaluminium compounds, used alone or as a mixture, in a manner such that the molar ratio of the ensemble of the Lewis base and phosphine ligand complexed with the nickel of the composition to the nickel is in the range 5 to 30. The invention also concerns the use of said catalytic composition.

Abstract: The invention concerns a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II), at least one phosphine ligand with formula PR1R2R3 in which the groups R1, R2 and R3, which may be identical or different and which may or may not be bonded together, and at least one Lewis base, said composition having a molar ratio of the phosphine ligand to the nickel precursor of less than or equal to 5 and a molar ratio of the Lewis base and phosphine ligand together to the nickel precursor of greater than or equal to 5.

Abstract: The invention describes a novel nickel-based composition. The invention also concerns the use of said composition as a catalytic composition in an olefin oligomerization process.

Abstract: The invention concerns a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II) containing a phosphine ligand complexed with nickel, at least one Lewis base, and at least one activating agent selected from the group formed by chlorinated and brominated hydrocarbylaluminium compounds, used alone or as a mixture, in a manner such that the molar ratio of the ensemble of the Lewis base and phosphine ligand complexed with the nickel of the composition to the nickel is in the range 5 to 30. The invention also concerns the use of said catalytic composition.

Abstract: The invention concerns a process for the dimerization of ethylene to 1-butene, carried out with a catalytic composition comprising: at least one nickel precursor with an oxidation number of (+II), at least one phosphine ligand with formula PR1R2R3 in which the groups R1, R2 and R3 may be identical or different and which may or may not be bonded together, and at least one activating agent selected from the group formed by chlorinated and brominated hydrocarbylaluminium compounds, used alone or as a mixture, said composition having a molar ratio of the phosphine ligand to the nickel precursor in the range 5 to 30 and a molar ratio of the activating agent to the phosphine ligand greater than or equal to 1.

Abstract: The invention describes a novel dissymmetric nickel-based complex and the method of preparation thereof from at least one diphosphinamine ligand B1 of formula (R1)(R?1)P—N(R3)—P(R2)(R?2), or an iminobisphosphine ligand B2 of formula (R3)N?P(R1)(R?1)—P(R2)(R?2). The invention also concerns the use of said complex in a method for oligomerisation of olefins.

Abstract: The present invention describes a novel catalytic composition comprising at least one nickel complex, said complex being obtained from a mixture comprising at least one nickel precursor A with at least one imino-imidazole ligand B and a method of oligomerization of olefins using said catalytic composition.

Abstract: The invention describes a novel catalytic composition comprising at least one nickel precursor A with at least one diphosphinamine ligand B1 of formula (R1)(R?1)P—N(R3)—P(R2)(R?2) or an iminobisphosphine ligand B2 of formula (R3)N?P(R1)(R?1)—P(R2)(R?2) or an iminobisphosphine ligand B?2 of formula (R3)N?P(R2)(R?2)—P(R1)(R?1). The invention also describes the use of said catalytic composition in a method for the oligomerisation of olefins.

Abstract: The invention describes a novel type of nickel-based complex and its preparation method. The invention also concerns the use of said complex in a process for the transformation of olefins.

Abstract: The invention describes a novel dissymmetric nickel-based complex and the method of preparation thereof from at least one diphosphinamine ligand B1 of formula (R1)(R?1)P—N(R3)—P(R2)(R?2), or an iminobisphosphine ligand B2 of formula (R3)N?P(R1)(R?1)—P(R2)(R?2). The invention also concerns the use of said complex in a method for oligomerisation of olefins.

Abstract: The invention describes a novel type of nickel-based complex and its preparation method. The invention also concerns the use of said complex in a process for the transformation of olefins.

Abstract: The invention describes a nickel-based composition. The invention also concerns the use of said composition as a catalytic composition in an olefin oligomerization process.

Abstract: The invention describes a nickel-based composition. The invention also concerns the use of said composition as a catalytic composition in an olefin oligomerization process.