- Document Number:
20240110109
- Appl. No:
17/766577
- Application Filed:
October 19, 2020
- نبذة مختصرة :
A method for steam cracking a plastic-derived liquid feedstock can comprise: steam cracking a plastic-derived liquid feedstock in a steam cracker to produce a cracked product, wherein the plastic-derived liquid feedstock has a final boiling point of about 550° C. or less and an olefin content of about 40 wt % or less; quenching the cracked product from a temperature of about 750° C. or greater to a temperature of about 350° C. or less with a quench oil; and wherein the method does not comprise hydrotreating and/or fractionating the plastic-derived liquid feedstock before steam cracking.
- Claim:
1. A method comprising: steam cracking a plastic-derived liquid feedstock in a steam cracker to produce a cracked product, wherein the plastic-derived liquid feedstock has a final boiling point of about 550° C. or less and an olefin content of about 40 wt % or less; quenching the cracked product from a temperature of about 750° C. or greater to a temperature of about 350° C. or less with a quench oil; and wherein the method does not comprise hydrotreating the plastic-derived liquid feedstock before steam cracking.
- Claim:
2. The method of claim 1, wherein the method does not comprise fractionating the plastic-derived liquid feedstock before steam cracking.
- Claim:
3. The method of claim 1, further comprising: fractionating the cracked product after quenching into a plurality of cuts.
- Claim:
4. The method of claim 3, wherein the plurality of cuts comprise one or more cuts selected from the group consisting of: an overheads cut, a diesel cut, a light vacuum gas oil cut, and an atmospheric bottoms cut.
- Claim:
5. The method of claim 3 further comprising: recycling one or more of the plurality of cuts back as at least a portion of the quench oil.
- Claim:
6. The method of claim 1, wherein the quench oil comprises a C10 to C15 hydrocarbon.
- Claim:
7. The method of claim 1, wherein the plastic-derived liquid feedstock has a final boiling point of about 450° C. to about 550° C. and an olefin content of about 0.1 wt % to about 40 wt %.
- Claim:
8. The method of claim 1, wherein the quench oil is at a temperature of about 325° C. or less.
- Claim:
9. The method of claim 1, wherein the quench oil is at a temperature of about 150° C. to about 325° C.
- Claim:
10. The method of claim 1, wherein in quenching the cracked product drops from the temperature of about 750° C. to about 925° C. to the temperature of about 225° C. to about 350° C.
- Claim:
11. The method of claim 1, wherein steam cracking comprises: introducing the plastic-derived liquid feedstock into the steam cracker; heating the plastic-derived liquid feedstock in a first convection section of the steam cracker; entraining steam with the plastic-derived liquid feedstock to produce a diluted plastic-derived liquid feedstock; heating the diluted plastic-derived liquid feedstock in a second convection section of the steam cracker; and cracking the diluted plastic-derived liquid feedstock in the pyrolysis section of the steam cracker.
- Claim:
12. The method of claim 11, wherein the plastic-derived liquid feedstock is heated to a temperature of about 160° C. to about 230° C. in the first convection section of the steam cracker.
- Claim:
13. The method of claim 11, wherein the diluted plastic-derived liquid feedstock is a vapor before cracking.
- Claim:
14. The method of claim 11, wherein cracking is performed at a temperature of about 400° C. to about 900° C., a pressure of about 0.1 bar absolute (bara) to about 5 bara, and a residence time in the pyrolysis section of about 0.1 seconds to about 2.0 seconds.
- Claim:
15. A method comprising: steam cracking a plastic-derived liquid feedstock in a steam cracker to produce a cracked product, wherein the plastic-derived liquid feedstock has a final boiling point of about 550° C. or less and an olefin content of about 40 wt % or less; quenching the cracked product from a temperature of about 750° C. or greater to a temperature of about 350° C. or less with a quench oil; and wherein the method does not comprise fractionating the plastic-derived liquid feedstock before steam cracking.
- Claim:
16. The method of claim 15, further comprising: fractionating the cracked product after quenching into a plurality of cuts.
- Claim:
17. The method of claim 15, wherein the quench oil comprises a C10 to C15 hydrocarbon.
- Claim:
18. The method of claim 15, wherein the plastic-derived liquid feedstock has a final boiling point of about 450° C. to about 550° C. and an olefin content of about 0.1 wt % to about 40 wt %.
- Claim:
19. The method of claim 15, wherein the quench oil is at a temperature of about 325° C. or less.
- Claim:
20. The method of claim 15, wherein the quench oil is at a temperature of about 150° C. to about 325° C.
- Claim:
21. The method of claim 15, wherein in quenching the cracked product drops from the temperature of about 750° C. to about 925° C. to the temperature of about 225° C. to about 350° C.
- Current International Class:
10
- الرقم المعرف:
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Processing Request
No Comments.