Method for preparing structured directing agent
AssigneeJohnson Matthey Public Limited Company
InventorsSteven COLLIER, Da-Ming GOU, Jeremy WILT
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Abstract
Provided is a method for preparing a structure directing agent (SDA) for crystalline molecular sieve synthesis comprising the steps of (a) hydrolyzing analkyl sulfate counterion of a quaternary ammonium salt to produce an organic ammonium salt having a hydrogen sulfate counterion; and (b) contacting the organic ammonium salt having the hydrogen sulfate counterion with a source of hydroxide in solution to form an organic ammonium salt having a hydroxide counterion; wherein the organic ammonium salt is a structure directing agent (SDA) for crystalline molecular sieve synthesis.
Claims18
A composition comprising at least one of N,N-Dimethyl-3,5-dimethylpiperidinium methyl sulfate;
- N,N-Diethyl-2,6-dimethylpiperidinium ethyl sulfate;
- N,N-Dimethyl-9-azoniabicyclo[3.3.1]nonane methyl sulfate;
- N,N-Dimethyl-2,6-dimethylpiperidinium methyl sulfate;
- N-Ethyl-N-methyl-2,6-dimethylpiperidinium alkyl sulfate;
- N,N-Diethyl-2-ethylpiperidinium ethyl sulfate;
- N,N-Dimethyl-2-ethylpiperidinium methyl sulfate;
- N-Ethyl-N-methyl-2-ethylpiperidinium alkyl sulfate;
- N-Ethyl-N-propyl-2,6-dimethylpiperidinium alkylsulfate;
- and 2,2,4,6,6-Pentamethyl-2-azoniabicyclo[3.2.1] octane methyl sulfate.
The composition of claim 2 comprising N,N-Dimethyl-3,5-dimethylpiperidinium methyl sulfate.
A composition comprising at least one of N,N-Dimethyl-3,5-dimethylpiperidinium hydrogen sulfate;
- N,N-Diethyl-2,6-dimethylpiperidinium hydrogen sulfate;
- N,N-Dimethyl-9-azoniabicyclo[3.3.1]nonane hydrogen sulfate;
- N,N-Dimethyl-2,6-dimethylpiperidinium hydrogen sulfate;
- N-Ethyl-N-methyl-2,6-dimethylpiperidinium hydrogen sulfate;
- N,N-Diethyl-2-ethylpiperidinium hydrogen sulfate;
- N,N-Dimethyl-2-ethylpiperidinium hydrogen sulfate;
- N-Ethyl-N-methyl-2-ethylpiperidinium hydrogen sulfate;
- N-Ethyl-N-propyl-2,6-dimethylpiperidinium hydrogen sulfate;
- and 2,2,4,6,6-Pentamethyl-2-azoniabicyclo[3.2.1] octane hydrogen sulfate.
A method for preparing a structure directing agent (SDA) for crystalline molecular sieve synthesis comprising the steps of:
- a. reacting an amine-based SDA precursor with one or more dialkylsulfates in solution to form a first intermediate solution;
- b. contacting the first intermediate solution with an acid or base to produce a second intermediate solution containing an ammonium hydrogen sulfate ion;
- and
- c. contacting the second intermediate solution with a base to produce a final solution comprising a hydroxide form of an ammonium-based SDA.
Dependencies are inferred from the claim text.