Claims
- 1. A method for the preparation of light olefins from methanol conversion using a microspherical catalyst comprising SAPO-34 zeolite, and the method comprising the step of contacting methanol with a fluidized or moving bed of said catalyst and being characterized in that said SAPO-34 zeolite is prepared from alumina, silica and a preformed template tetraethylammonium phosphate.
- 2. A method according to claim 1 comprising the further steps of:continuously regenerating the catalyst of said bed with air, and substituting a portion of regenerated catalyst with fresh catalyst in order to keep constant the activity and selectivity of the catalyst.
- 3. A method according to claim 2, in which the regeneration with air is performed at 480-610° C.
- 4. A method according to claim 2, in which the contacting and the regeneration steps are performed in a reactor and a regenerator respectively with continuous circulation of the catalyst between said reactor and said regenerator.
- 5. A method according to claim 1, in which methanol is contacted with said catalyst at a temperature of 400-490° C. and liquid space velocities of 0.6 to 2.7 h−1.
- 6. A method according to claim 1, in which the preformed template tetraethylammonium phosphate is prepared from triethylamine, ethylbromide and phosphoric acid.
- 7. A method according to claim 1 in which the microspherical catalyst is obtained by the steps of:atomizing a mixture of said SAPO-34 zeolite and silica under pressure and at 400-450° C. to form microspheres.
Parent Case Info
This is a National Stage entry under 35 U.S.C. § 371 of Application No. PCT/RO99/00001 filed Jan. 11, 1999, and the complete disclosure of which is incorporated into this application by reference.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/RO99/00001 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO00/41986 |
7/20/2000 |
WO |
A |
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