Patent ID: 8058494

Claim:
A continuous cyclic process for the production of phenylalkanes that comprises at least: a) A reaction for alkylation of at least one aromatic compound by at least one olefin that has 9 to 16 carbon atoms per molecule, whereby said reaction is carried out in at least a first catalytic alkylation reactor within which n serial reaction zones that each contain at least one acidic solid catalyst are present, whereby n is greater than or equal to 2, and at the inlet of each of which one fraction corresponding to 1/n of the total amount of olefins necessary to said alkylation reaction is introduced, and fresh aromatic compound is introduced into the inlet of only the first of said serial reaction zones, b) The separation of at least a portion of the effluent that is obtained from stage a) to recover excess reagents, on the one hand, and the phenylalkanes, on the other hand, c) The reactivation of each acidic solid catalyst present in each of n reaction zones of at least a second catalytic alkylation reactor placed in parallel relative to said reactor(s) used in said stage a), whereby n is greater than or equal to 2, and d) The periodic switching of functions carried out by at least said first catalytic alkylation reactor used in stage a) and at least said second catalytic alkylation reactor that is used in stage c) such that at least said first catalytic alkylation reactor that is initially used in said stage a) is used under the conditions of said stage c) at the end of a duration that is at least equal to 5 hours and such that at least said second catalytic alkylation reactor that is initially used in said stage c) is used under the conditions of said stage a).