METHOD OF OLIGOMERISATION IN CASCADE OF GAS-LIQUID MIXING REACTORS WITH STAGED INPUT OF ETHYLENE Russian patent published in 2024 - IPC C07C2/08 B01J19/00 

FIELD: ethylene oligomerisation.

SUBSTANCE: invention relates to a method for ethylene oligomerisation. A method for the selective oligomerisation of ethylene into a linear alpha-olefin is disclosed. The process is carried out at pressure from 0.1 to 10.0 MPa, temperature from 30°C up to 200°C, in a cascade of N gas-liquid reactors connected in series, where N is from 3 to 6. To implement the method, a homogeneous catalytic system for oligomerisation containing at least one metal precursor is introduced into at least the first reactor of the cascade. Said catalyst system is then contacted with ethylene, which is introduced into the lower portion of the reaction chamber of at least the first reactor of the cascade, without said ethylene being introduced into the last reactor of the cascade. Next, for each n-th reactor, the stage of selecting the liquid fraction from the lower part of the reaction chamber of the n-th reactor is carried out. In this case, the liquid fraction is divided into two streams. The first stream, corresponding to the first part of the liquid fraction, called the main stream, is sent to a heat exchanger for cooling. The second stream, corresponding to the second part of the liquid fraction, forms a liquid feed to the next (n+1)th reactor of the cascade.

EFFECT: increased ethylene conversion with high selectivity for alpha-olefin.

11 cl, 4 dwg, 4 ex