Zeolite synthesis in a reactor with controlled velocity profile

A process for preparing a zeolitic material having a framework structure comprising YO2 and comprising X2O3, wherein Y is Si or Si and Ti and wherein X is Al, said processing comprising:

• (i) preparing a mixture comprising a source of YO2, a source of X2O3, and a liquid solvent system, wherein a molar ratio of YO2:X2O3 of the mixture prepared in (i) ranges from 1 to 1,000;
• (ii) feeding the mixture prepared in (i) as a reaction mixture into a reactor;
• (iii) heating the reaction mixture in the reactor, to obtain a reacted mixture comprising a zeolitic material having a framework structure comprising YO2 and comprising X2O3;
• and
• (iv) collecting the reacted mixture obtained in (iii) as an effluent from the reactor;
• wherein the reactor is a Taylor-Couette reactor comprising an inner cylinder and an outer cylinder which are coaxially aligned, wherein the Taylor-Couette reactor has a rotor-stator set-up, with the outer cylinder as a stator, wherein a total volume of the reactor containing the reaction mixture is from 5 cm3 to 1 m3,
• wherein the mixture prepared in (i) further comprises at least one source for OH−, wherein said at least one source for OH− comprises a metal hydroxide,
• wherein in (iii) the reaction mixture is heated to a temperature in the range of from about 100° C. to about 300° C.,
• wherein in (iii) the reaction mixture is heated under autogenous pressure,
• wherein in (iii) the flow regime in at least a portion (P) of the volume of the reactor is laminar, wherein the portion (P) is an uninterrupted portion of the volume of the reactor, and
• wherein the uninterrupted portion (P) of the volume of the reactor constitutes 10% to 95% of the total volume of the reactor containing the reaction mixture.