Process for a continuous synthesis of zeolitic materials
A continuous process for preparing a zeolitic material comprising (i) preparing a mixture comprising a source of YO 2 , optionally a source of X 2 O 3 , and a liquid solvent system; (ii) continuously feeding the mixture prepared in (i) into a continuous flow reactor at a liquid hourly space velocity in the range of from 0.3 to 20 h − 1 for a duration of at least 1 h; and (iii) crystallizing the zeolitic material from the mixture in the continuous flow reactor, wherein the mixture is heated to a temperature in the range of from 100 to 300° C.; wherein the volume of the continuous flow reactor is in the range of from 150 cm 3 to 75 m 3 , as well as to zeolitic materials which may be obtained according to the inventive process and to their use.
1. A continuous process for preparing a zeolitic material, the process comprising:
continuously feeding a mixture comprising a source of YO 2 , optionally a source of X 2 O 3 , and a liquid solvent system, into a continuous flow reactor at a liquid hourly space velocity in the range of from 0.3 to 20 h −1 for a duration of at least 1 h; and
crystallizing the zeolitic material from the mixture in the continuous flow reactor, the crystallizing comprising heating the mixture to a temperature in a range of from 100 to 300° C. in the continuous flow reactor,
wherein a volume of the continuous flow reactor is in the range of from 150 cm 3 to 75 m 3 .
2. The process of claim 1 , wherein the continuous flow reactor is a tubular reactor, a ring reactor, or a continuously oscillating reactor.
3. The process of claim 1 , wherein a wall of the continuous flow reactor comprises a metallic material.
4. The process of claim 1 , wherein a surface of the inner wall of the continuous flow reactor is lined with an organic polymer material.
5. The process of claim 1 , wherein, in the crystallizing, the mixture is heated under autogenous pressure.
6. The process of claim 1 , wherein the continuous flow reactor consists of a single stage.
7. The process of claim 1 , wherein no matter is added and/or removed from the reaction mixture during its passage through the continuous flow reactor in the crystallizing.
8. The process of claim 1 , further comprising:
preheating the mixture while feeding the mixture directly into the continuous flow reactor in the continuously feeding.
9. The process of claim 1 , further comprising:
quenching the reaction product effluent continuously exiting the reactor in the crystallizing with a liquid comprising a solvent and/or via expansion of the reaction product effluent;
and/or,
isolating the zeolitic material obtained in the crystallizing or quenching;
and/or,
washing the zeolitic material obtained in the crystallizing, quenching, or isolating;
and/or,
drying the zeolitic material obtained in the crystallizing, quenching, isolating, or washing;
and/or,
calcining the zeolitic material obtained in the crystallizing, quenching, isolating, washing, or drying.
10. The process of claim 9 , wherein the isolating is performed, and
wherein a supernatant obtained from the isolating of the zeolitic material, and/or
wherein a feed having the same composition as the supernatant, is not at any point recycled to the reaction mixture during its passage through the continuous flow reactor.
11. The process of claim 1 , wherein Y comprises Si, Sn, Ti, Zr, and/or Ge.
12. The process of claim 1 , wherein X comprises Al, B, In, and/or Ga.
13. The process of claim 1 , wherein the mixture comprises substantially no phosphorous and/or phosphorous comprising compounds.
14. A zeolitic material, obtained by the process of claim 1 .
15. A process, comprising employing the zeolitic material of claim 14 as a molecular sieve, as an adsorbent, for ion-exchange, as a catalyst, and/or as a catalyst support.
16. The process of claim 1 , wherein the volume of the continuous flow reactor is in the range of from 175 cm 3 to 1 m 3 .
17. The process of claim 1 , wherein the volume of the continuous flow reactor is at least 200 cm 3 .
18. The process of claim 1 , wherein the liquid hourly space velocity is no more than 8 h −1 .
19. The process of claim 1 , wherein the liquid hourly space velocity is in a range of from 4 to 6 h −1 .