Process and a system for enhancing the yield of light olefins
AssigneeIndian Oil Corporation Limited
InventorsShikha Saluja, Gadari Saidulu, Madhusudan Sau, Sadhullah Mukthiyar, Terapalli Hari Venkata Devi Prasad, Reshmi Manna
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Abstract
The present disclosure provides a process for high conversion residue cracking in a circulating fluidized bed reactor while integrating it with the dehydration of ethanol. More particularly, the present disclosure relates to an integrated circulating fluidized bed process for the simultaneous dehydration of ethanol and cracking of a hydrocarbon feedstock. By integrating the cracking reactor with ethanol dehydration reactor, more conradson carbon residue feedstock can be processed in cracking reactor while limiting the coke combustor temperature.
Claims14
An integrated circulating fluidized bed process for simultaneous dehydration of ethanol and cracking of a hydrocarbon feedstock, wherein the process comprises:
- feeding the hydrocarbon feedstock having a conradson carbon content (CCR) of at least 4 wt % and a regenerated catalyst obtained from a coke combustor to a fluidized bed cracking reactor;
- cracking the hydrocarbon feedstock at a temperature in a range of 490 to 680° C. while depositing coke on the regenerated catalyst to obtain a reaction mixture comprising hydrocarbon vapor products and a coke-laden catalyst;
- separating the hydrocarbon vapor products and the coke-laden catalyst at the end of the fluidized bed cracking reactor, and routing the hydrocarbon vapor products for fractionation;
- stripping the coke-laden catalyst to remove unseparated hydrocarbon vapor products contained therein;
- routing the coke-laden catalyst obtained from the stripping step and ethanol to a dehydration reactor for dehydrating ethanol to ethylene and to obtain a product mixture and a deactivated catalyst, wherein the dehydration reactor is maintained at a temperature in a range of 300 to 600° C., wherein the product mixture is routed to the fluidized bed cracking reactor for fractionation;
- routing the deactivated catalyst obtained from the dehydrating step to the coke combustor and burning the coke on the deactivated catalyst in the presence of air or oxygen containing gases at a temperature in a range of 600-700° C. to obtain the regenerated catalyst and flue gas;
- and
- circulating the regenerated catalyst to the fluidized bed cracking reactor for cracking the hydrocarbon feedstock,
- wherein the process is carried out without a separate catalyst cooler or a heat exchanger, and wherein the dehydration of ethanol yields ethylene in a range of 40 to 60 wt % on ethanol basis.
An integrated system for simultaneous dehydration of ethanol and cracking of a hydrocarbon feedstock comprising:
- a catalytic cracking unit comprising a fluidized bed cracking reactor operated at a temperature in a range of 490 to 680° C. for receiving the hydrocarbon feedstock and a regenerated catalyst, and for cracking the hydrocarbon feedstock to obtain a reaction mixture comprising hydrocarbon products and a coke-laden catalyst;
- a dehydration unit comprising a dehydration reactor operated at a temperature in a range of 300 to 600° C. for receiving the coke-laden catalyst from fluidized bed cracking and ethanol, and for dehydrating the ethanol to ethylene and to obtain a product mixture and a deactivated catalyst, wherein the dehydration of ethanol yields ethylene in a range of 40 to 60 wt % on ethanol basis;
- and
- a coke combustor unit comprising a coke combustor for receiving the deactivated catalyst from the dehydration reactor, and for regenerating the deactivated catalyst by burning in the presence of air or oxygen containing gases, wherein the integrated system excludes a separate catalyst cooler or a heat exchanger.
Dependencies are inferred from the claim text.