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.
Claims13
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.
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:
- reacting an optionally substituted pyridine-based SDA precursor with one or more dialkylsulfates in solution to form a first intermediate solution containing a pyridinium alkyl sulfate;
- b. reducing the first intermediate solution of pyridinium alkyl sulfate to provide a second intermediate solution of piperidinium alkyl sulfate;
- c. reacting the second intermediate solution of piperidinium alkyl sulfate with one or more dialkylsulfates in solution to form a third intermediate solution of piperidinium alkyl sulfate;
- d. contacting the third intermediate solution with an acid or base to produce a fourth intermediate solution of piperidinium hydrogen sulfate;
- and
- e. contacting the fourth intermediate solution with a base to produce a final solution comprising an hydroxide form of an ammonium-based SDA.
Dependencies are inferred from the claim text.