Catalytic method for selective cyclo-amination of alkanolamine and diol to produce on-purpose cyclic ethyleneamines of piperazine and derivatives
AssigneeUop LLC
InventorsNabil Al Yassir, Carl J. Stevens, Edwin P. Boldingh
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Abstract
Catalytic processes to produce on purpose piperazine are described. The processes are based on the use of a 10-member ring zeolite, preferably with MFI topology, with tunned morphology and acidity to promote intermolecular or intramolecular cyclization of alkanolamines, ethyleneamines, or diols to cyclic piperazine. The unavoidable byproducts due to thermodynamics can be tuned to favor piperazine upon recycling. The processes can be used to manufacture piperazine which can be used as solvent for post-combustion CO2 capture.
Claims20
A process for the production of piperazine comprising:
- reacting an alkanolamine or an ethyleneamine or a diol in a reaction zone comprising a reactor in the presence of anhydrous ammonia and a catalyst comprising a 10-member ring zeolite to produce a reaction mixture comprising piperazine.
A process for the production of piperazine comprising:
- reacting an alkanolamine or an ethyleneamine or a diol in a reaction zone comprising a reactor in the presence of anhydrous ammonia and a catalyst comprising a 10-member ring zeolite to produce a reaction mixture comprising piperazine and a piperazine derivative;
- separating the reaction mixture into a piperazine stream comprising the piperazine and a byproduct stream comprising the piperazine derivative;
- and
- recycling the byproduct stream to the reaction zone;
- wherein the reaction takes place at a temperature in a range of 285° C. to 350° C., and pressure in a range of 1700-2500 psig.
Dependencies are inferred from the claim text.