Chemistry of inorganic compounds – Zeolite – Seed used
Reexamination Certificate
2006-09-26
2006-09-26
Sample, David (Department: 1755)
Chemistry of inorganic compounds
Zeolite
Seed used
C423S700000, C423S306000, C423SDIG030, C502S208000, C502S214000
Reexamination Certificate
active
07112316
ABSTRACT:
A process for synthesizing a variety of molecular sieves has been developed. The process involves forming a reaction mixture comprising reactive sources of the framework elements plus at least one templating agent, reacting the mixture to at least partially crystallize the molecular sieve and provide a slurry of seed crystals and adding to it nutrients (sources) of the framework elements, e.g. aluminum and silicon in order to grow the seed crystals. The rate of addition of the nutrients is controlled such that it is substantially the same as the crystal growth rate and such that there is substantially no nucleation of new crystals. The seed crystals may be the same or different than the nutrients being added, thus allowing for a layered molecular sieve. When the crystals have reached a desired size, they are isolated by conventional techniques.
REFERENCES:
patent: 3425800 (1969-02-01), Hirsh
patent: 3516786 (1970-06-01), Maher et al.
patent: 3702886 (1972-11-01), Argauer
patent: 3781226 (1973-12-01), Schartz
patent: 3926782 (1975-12-01), Plank et al.
patent: 4061724 (1977-12-01), Grose et al.
patent: 4310440 (1982-01-01), Wilson et al.
patent: 4314979 (1982-02-01), Deabriges
patent: 4383981 (1983-05-01), van Erp et al.
patent: 4440871 (1984-04-01), Lok et al.
patent: 4500651 (1985-02-01), Lok et al.
patent: 4606901 (1986-08-01), Chu et al.
patent: 4642226 (1987-02-01), Calvert et al.
patent: 4801476 (1989-01-01), Dunsmuir et al.
patent: 5242675 (1993-09-01), Verduijn
patent: 5318766 (1994-06-01), Vaughan et al.
patent: 5389358 (1995-02-01), Wu et al.
patent: 5672331 (1997-09-01), Verduijn
patent: 6773694 (2004-08-01), Lesch et al.
patent: 2004/0047803 (2004-03-01), Valtchev et al.
Cundy, C.S., Henty, M.S. and Plaisted, R.J.,Zeolite Synthesis Using a Semicontinuous Reactor, Part 1: Controlled Nucleation and Growth of ZSM-5 Crystals Having Well-Defined Morphologies, Zeolites 15: 353-372, 1995.
Cundy, C.S., Henty, M.S. and Plaisted, R.J.,Zeolite Synthesis Using a Semicontinuous Reactor, Part 2: Synthesis at High Nucleation Rates, Zeolites 15: 400-407, 1995.
Jacobsen Lance L.
Konrad Brian S.
Lesch David A.
Marte Julio C.
Mezza Beckay J.
Molinaro Frank S.
Sample David
Tolomei John G.
UOP LLC
LandOfFree
Process for preparing molecular sieves via continuous... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for preparing molecular sieves via continuous..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing molecular sieves via continuous... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3559027