A process for preparation of a MEL-structural-type zeolite that comprises at least the following stages: i) the mixture, in aqueous medium, of at least one source of at least one tetravalent element and at least one nitrogen-containing organic radical of the formula: in which n represents the methylene group number (CH2) and is equal to 6 or 7, and R1 and R2 represent alkyl groups that have 2 to 7 carbon atoms, ii) the hydrothermal treatment of said mixture until said MEL-structural-type zeolite is formed, is described.