Process for the preparation of TS-1 zeolites

摘要

The invention relates to a new process which allows the preparation of TS-1 zeolites in a pure phase and with a crystallinity higher than 95%, operating at reduced reaction volumes, and obtaining high productivities and extremely high crystallization yields. The particular crystalline form of the TS-1 zeolite thus prepared, is also described.

主权项

1. A process for preparing TS-1 zeolite crystals, the process comprising hydrothermally treating a mixture consisting essentially of:
a silicon source; a titanium source; and tetrapropyl ammonium hydroxide (TPA-OH)at autogenous pressure, at a temperature ranging from 190 to 230° C., and for a time of 0.5 to 10 hours, in the absence of alkaline metals, thereby obtaining TS-1 zeolite crystals having a crystallinity higher than 95% and a crystallization yield higher than 90%, wherein
the mixture has the following composition as molar ratios:
Si/Ti=35-150;TPA-OH/Si=0.2-0.5;H2O/Si=from 4 to less than 10; andH2O/Ti=from 320 to 600.