Patent ID: 6709638
Filing Date: 2004-03-23
Classification: C07C

Abstract:
A system comprising:an alkylation reactor; a settler, having an upper portion, an intermediate portion and a lower portion; a first separator, having an upper portion, an intermediate portion and a lower portion; a second separator, having an upper portion, an intermediate portion and a lower portion; a third separator, having an upper portion, an intermediate portion and a lower portion; a condenser unit; first conduit means operably related to said alkylation reactor for introducing a hydrocarbon feedstock comprising olefins and isoparaffins into said alkylation reactor; second conduit means operably related to said alkylation reactor for introducing a catalyst mixture comprising a volatility reducing additive, hydrofluoric acid and water into said alkylation reactor; third conduit means operably related to said alkylation reactor and operably related to said settler for withdrawing a reaction zone effluent from said alkylation reactor and for introducing said reaction zone effluent into said intermediate portion of said settler, said upper portion of said settler being operable for containing a hydrocarbon phase separated from said reaction zone effluent and said lower portion of said settler being operable for containing a catalyst mixture phase separated from said reaction zone effluent; fourth conduit means operably related to said settler and operably related to said first separator for withdrawing at least a portion of said hydrocarbon phase from said upper portion of said settler and for introducing said at least a portion of said hydrocarbon phase into the intermediate portion of said first separator; fifth conduit means operably related to said first separator and operably related to said condenser unit for withdrawing an overhead stream from said upper portion of said first separator and for introducing said overhead stream into said condenser unit; sixth conduit means operably related to said condenser unit and operably related to said second separator for withdrawing an HF/water stream from said condenser unit and for introducing said HF/water stream into said intermediate portion of said second separator; seventh conduit means operably related to said sixth conduit means and operably related to said settler for withdrawing a portion of said HF/water stream from said sixth conduit means and for introducing said portion of said HF/water stream into said intermediate portion of said settler; eighth conduit means operably related to said first separator for withdrawing an alkylate product stream from said first separator; ninth conduit means operably related to said settler and operably related to said alkylation reactor for withdrawing at least a portion of said catalyst mixture phase from said settler and for introducing said at least a portion of said catalyst mixture phase into said alkylation reactor; tenth conduit means operably related to said settler and operably related to said second separator for withdrawing a catalyst mixture phase regeneration stream from the lower portion of said settler and for introducing said catalyst mixture phase regeneration stream into the intermediate portion of said second separator; eleventh conduit means operably related to said second separator and operably related to said settler for withdrawing a second separator overhead stream from the upper portion of said second separator and for introducing said second separator overhead stream to the intermediate portion of said settler; twelfth conduit means operably related to said second separator and operably related to said third separator for withdrawing a second separator bottoms stream from the lower portion of said second separator and for introducing said second separator bottoms stream to the intermediate portion of said third separator, said upper portion of said third separator being operable for containing ASO and said lower portion of said third separator being operable for containing HF and volatility reducing additive; thirteenth conduit means operably related to said twelfth conduit means for withdrawing a purge stream from said twelfth conduit means; and fourteenth conduit means operably related to said third separator and operably related to said settler for withdrawing a third separator bottoms stream from said lower portion of said third separator and for introducing at least a portion of said third separator bottoms stream into said intermediate portion of said settler.