Abstract: The invention concerns a process for the oligomerization of ethylene into alpha-olefins, comprising a step for the oligomerization of ethylene, a step for deactivation of the catalyst, a and step for separation of the products, the reactor being provided with a cooling loop (100, 101, 102) by means of which at least a portion of the reaction effluent is moved through at least two switchable heat exchangers, said heat exchangers being cleaned alternately by means of an integrated cleaning device.

Abstract: System for distributing a liquid and/or gas phase into a reaction vessel (1g), reaction vessel (1g) comprising at least one inlet (1h) for injection of the liquid and/or gas phase, the system according to the invention comprising a distributor for distributing this phase by means of at least one tube (1d) provided with a plurality of perforations (2d), as well as removable fastening means (1i) for the distributor when it is arranged within the reaction vessel. According to the invention, the section of the distributor is smaller than the section of inlet (1h) of reaction vessel (1g), so as to be able to insert and/or to remove the distributor through inlet (1h) of vessel (1g). Application to the field of petroleum refining, more particularly to the distribution of a liquid and/or gas phase into a reaction vessel. FIG. 2.1 to be published.

Abstract: The invention concerns a process for the oligomerization of ethylene into alpha-olefins, comprising a step for the oligomerization of ethylene, a step for deactivation of the catalyst, a and step for separation of the products, the reactor being provided with a cooling loop (100, 101, 102) by means of which at least a portion of the reaction effluent is moved through at least two switchable heat exchangers, said heat exchangers being cleaned alternately by means of an integrated cleaning device.