Methods for making molecular sieves
AssigneeChevron U.S.A. Inc.
InventorsStephen Joseph Miller, Seymour Cherney
Life of this patent
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Abstract
An in-extrudate reaction mixture to be effectively crystallized is effectively crystallized to produce zeolitic or non-zeolitic molecular sieves. The reaction mixture is heated within a slowly rotating, double-walled reactor vessel wherein a heated medium is conducted within a space formed between the double walls of the vessel. Thus, the reaction mixture is contacted by a uniformly heated wall while being gently tumbled at low speed. The tumbling action serves to uniformly distribute the heat within the reaction mixture without subjecting the mixture to such shearing that could damage shaped particles. A relatively high quantity of reaction mixture can be handled in that way to maximize the production volumes and reduce production costs.
Claims17
A method for making a molecular sieve, said method comprising:
- A) preparing a reaction mixture capable of crystallizing into molecular sieves when suitably heated;
- B) introducing the reaction mixture into a reaction chamber formed by a double-walled reactor vessel;
- and
- C) passing a heated medium through a space defined between the double walls of the reactor vessel while rotating the vessel, to cause the reaction mixture to attain a substantially uniform temperature at crystallization conditions.
A process for preparing a non-zeolitic molecular sieve comprising:
- A) producing a reaction mixture comprising:
- i. at least one active source of phosphorous,
- ii. at least one active source of alumina,
- iii. an organic templating agent capable of forming the molecular sieve;
- and
- B) introducing the reaction mixture into a reaction chamber formed by a double-walled reactor vessel;
- and
- C) passing a heated medium through a space defined between the double walls of the reactor vessel while rotating the vessel to cause the particles to attain a substantially uniform temperature at crystallization conditions.
Dependencies are inferred from the claim text.