Integration of catalytic cracking process with crude conversion to chemicals process
A method that integrates a catalytic cracking process with a crude oil conversion to chemicals process is disclosed. The method may include contacting, in a catalytic cracking reactor, a mixture of the hydrocarbon stream comprising primarily C 5 and C 6 hydrocarbons from crude oil processing and a C 4 to C 5 hydrocarbon stream produced in a steam cracking unit with a catalyst under reaction conditions sufficient to produce an effluent comprising olefins.
1. A method of producing olefins, the method comprising:
processing crude oil to produce a plurality of streams that include a hydrocarbon stream comprising primarily C 5 and C 6 hydrocarbons;
receiving, in a catalytic cracking reactor, the hydrocarbon stream comprising primarily C 5 and C 6 hydrocarbons;
receiving, in the catalytic cracking reactor, a C 4 to C 5 hydrocarbon stream from a steam cracking unit;
contacting, in the catalytic cracking reactor, a mixture of the hydrocarbon stream comprising primarily C 5 and C 6 hydrocarbons and the C 4 to C 5 hydrocarbon stream from the steam cracking unit with a catalyst under reaction conditions sufficient to produce an effluent comprising olefins; and
separating the effluent to produce at least a first product stream comprising C 2 to C 4 olefins, a second product stream comprising C 2 to C 4 paraffins, and a third product stream comprising C 5+ -gasoline;
wherein the reaction conditions include a reaction pressure in a range of 2.1 to 5.0 bars a residence time of reactants in the catalytic cracking reactor is in a range of 1 to 10 seconds, and a reaction temperature in a range of from 625° C. to 700° C.;
wherein the separating of the effluent further comprises producing a dry gas stream, and
wherein the dry gas stream comprises methane and hydrogen.
2. The method of claim 1 further comprising:
receiving, in the catalytic cracking reactor, material comprising a coke precursor; and
contacting, in the catalytic cracking reactor, a mixture comprising (1) the hydrocarbon stream comprising primarily C 5 and C 6 hydrocarbons, (2) the C 4 to C 5 hydrocarbon stream from the steam cracking unit, and (3) the material comprising the coke precursor with the catalyst under reaction conditions sufficient to produce coke and the effluent comprising olefins.
3. The method of claim 2 , wherein the material comprising the coke precursor comprises fuel oil and/or diolefin from the steam cracking unit.
4. The method of any of claim 3 , wherein the diolefin comprises butadiene.
5. The method of claim 1 , wherein the catalytic cracking reactor is a fluidized bed reactor.
6. The method of claim 5 , wherein the fluidized bed reactor includes a selection from the list consisting of: a riser, a downer, multiple risers, and multiple downers, and combinations thereof.
7. The method of claim 5 , wherein a ratio of total hydrocarbon to catalyst in the fluidized bed reactor is 2 to 40 wt. %.
8. The method of claim 1 , wherein the catalytic cracking reactor is a fixed bed reactor system.
9. The method of claim 8 , wherein the fixed bed reactor system includes a selection from the list consisting of: a single fixed bed reactor, multiple reactors arranged in series, multiple reactors arranged in parallel, and combinations thereof.
10. The method of claim 1 , wherein the reaction conditions include a reaction pressure in a range of 2.2 bars to 5 bars.
11. The method of claim 1 , wherein the catalyst comprises a solid acid based zeolite catalyst selected from the list consisting of: one or more large pore zeolites, including zeolite Y and ultra-stable zeolite Y; and combinations thereof.
12. The method of claim 1 , wherein a yield of the C 2 to C 4 olefins resulted from the contacting is in a range of 25 to 65 wt. %.
13. The method of claim 1 , wherein a yield of the C 2 to C 4 olefins resulted from the contacting is in a range of 35 to 65 wt. %.