| 主权项 |
1. A process for producing an oligomeric product by oligomerisation of at least one olefinic compound, the process including:
a) providing an activated oligomerisation catalyst by combining, in any order,
i) a source of chromium;ii) a ligating compound of the formula
(R1)mX1(Y)X2(R2)n wherein X1 and X2 are independently an atom selected from the group consisting of nitrogen, phosphorus, and oxygen or an oxidised nitrogen or phosphorus atom where the valence of X1 and/or X2 allows for such oxidation;
Y is a linking group between X1 and X2;m and n are independently 0, 1 or a larger integer; and R1 and R2 are independently hydrogen, a hydrocarbyl group, an organoheteryl group, a heterohydrocarbyl group, a substituted hydrocarbyl group, or a substituted heterohydrocarbyl group, and R1 being the same or different when m>1, and R2 being the same or different when n>1; and
iii) a catalyst activator or combination of catalyst activators; and b) contacting at least one olefinic compound with the activated oligomerisation catalyst in the presence of a non-metal oxygen containing additive, which non-metal oxygen containing additive may be introduced together with the activated catalyst, after introduction of the activated catalyst but prior to introduction of the olefinic compound, together with the olefinic compound, or after the olefinic compound has contacted the activated catalyst, the non-metal oxygen containing additive being present in an amount such that the ratio of the molar amount of the non-metal oxygen containing additive to the molar amount of chromiumper 106 g/g Cr productivity in the source of chromium is between 0.01 and 400. |
