Process and unit for carrying out a reaction on an organic feed, such as dimerisation or metathesis, in the presence of a polar phase containing a catalyst

A process comprising catalytically reacting at least one organic compound constituting all or part of a liquid organic phase, in the presence of a polar liquid phase containing a catalyst composition, wherein:

• the polar liquid phase containing a catalyst composition results from a mixture of at least one catalyst compound and at least one non-aqueous ionic medium, which is sufficiently immiscible with the organic phase that the polar and organic phases can be separated by decanting,
• the organic phase and the polar phase are circulated in counter-current contact in at least two treatment loops connected in series, each loop comprising at least one reaction zone containing a reaction medium of the organic and polar phases in contact and connected to the reaction zone, at least one separation zone for separating the organic and polar phases by decanting,
• a feed containing the organic compound is supplied to the reaction zone of a first treatment loop and the polar phase is supplied to the reaction zone of a second treatment loop,
• polar phase separated in the separation zone of the second treatment loop is sent to the reaction zone of the first treatment loop, and
• organic phase separated in the separation zone of the first treatment loop is sent to the reaction zone of the second treatment loop.