Pentasil zeolites agglomerated in the form of hollow spheres
AssigneeBASF SE
InventorsUlrich Mueller, Axel Reich, Klaus Unger
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Abstract
Abstract of the Disclosure: Pentasil zeolites agglomerated in the form of hollow spheres and having a particle size of from 5 to 200 micron are prepared by treating a mixture of an aqueous alkylenediamine, alkylenetriamine and/or alkylenetetramine, silica and an aluminum, boron and/or titanium salt at from 20.degree. to 100.degree. C., then crystallizing the product at from 110.degree. to 200.degree. C. and from 0.01 to 50 bar and calcining it at from 400.degree. to 650.degree. C., and said zeolites are used as catalysts and/or adsorbents.
Claims16
A pentasil zeolite of intergrown primary crystallites agglomerated in the form of egg-shaped hollow spheres which have a size of about 5 to 200 micron.
A process for the preparation of a pentasil zeolite in which intergrown primary crystallites are agglomerated in the form of egg-shaped hollow spheres, which comprises:
- stirring a liquid mixture of SiO.sub.2 and an aqueous solution of at least one amine selected from the group consisting of alkylenediamines, alkylenetriamines and alkylenetetramines and admixing therewith an aqueous solution of at least one cation selected from the group consisting of aluminum, boron and titanium at a temperature of from 10.degree. to 100.degree. C. and for a period of time sufficient to obtain an homogeneous slurry comprising agglomerated but still amorphous gel particles having a size of about 5 to 200 microns;
- then heating the resulting mixture for crystallization of said particles at a temperature of from 110.degree. to 200.degree. C. and a pressure of from 0.01 to 50 bar;
- and
- thereafter cooling and separating the solid crystallized product.
Dependencies are inferred from the claim text.