Temperature Control for Centrifugation of Steam Cracked Tar

Patent metadata

Field	Value
Publication number	US-2022033720-A1
Application number	US-201917298972-A
Country	US
Kind code	A1
Filing date	Dec 11, 2019
Priority date	Dec 14, 2018
Publication date	Feb 3, 2022
Grant date	—

Abstract

Processes for preparing a low particulate liquid hydrocarbon product are provided and includes blending a tar stream containing particles with a fluid to produce a fluid-feed mixture containing tar, the particles, and the fluid, and centrifuging the fluid-feed mixture at a temperature of greater than 60° C. to produce a higher density portion and a lower density portion, where the lower density portion contains no more than 25 wt % of the particles in the fluid-feed mixture.

First claim

1 . A process for preparing a low particulate liquid hydrocarbon product comprising:
blending a hydrocarbon feed comprising particles with a fluid to produce a fluid-feed mixture comprising tar, the particles, and the fluid; and centrifuging the fluid-feed mixture at a temperature of greater than 60° C. to produce a higher density portion and a lower density portion, wherein at least 75% by weight of the particles are transferred from the fluid-feed mixture to the higher density portion, based on the weight of the particles in the fluid-feed mixture.

2 . The process of claim 1 , wherein at least 90% by weight of the particles are transferred from the fluid-feed mixture to the higher density portion.

3 . The process of claim 1 , wherein at least 95% by weight of the particles are transferred from the fluid-feed mixture to the higher density portion.

4 . The process of claim 1 , wherein at least 98% by weight of the particles are transferred from the fluid-feed mixture to the higher density portion.

5 . The process of claim 1 , wherein the lower density portion comprises about 100 ppmw or less of the particles having a size of greater than 25 based on the weight of the lower density portion.

6 . The process of claim 1 , wherein the lower density portion is substantially free of particles of size greater than 25 μm.

7 . The process of claim 1 , wherein the fluid-feed mixture is centrifuged at a temperature of greater than 60° C. to about 200° C., and wherein the hydrocarbon feed comprises tar.

8 . The process of claim 1 , wherein the particles have a specific gravity from about 1.04 to about 1.5.

9 . The process of claim 1 , wherein the particles comprise polymeric asphaltene particles, polymeric coke particles, pyrolytic coke particles, inorganic fines, or any combination thereof; and wherein the hydrocarbon feed comprises steam cracker tar.

10 . The process of claim 9 , wherein the particles comprise polymeric coke particles, and wherein the polymeric coke particles have a specific gravity of about 1.04 to about 1.1.

11 . The process of claim 1 , further comprising hydroprocessing at least a portion of the lower density portion.

12 . A process for preparing a low particulate liquid hydrocarbon product comprising:
blending a tar stream comprising particles with a fluid to produce a fluid-feed mixture comprising tar, the particles, and the fluid, wherein the fluid-feed mixture comprises greater than 500 ppmw of the particles having a size of greater than 25 μm, based on the weight of the fluid-feed mixture; and centrifuging the fluid-feed mixture at a temperature of greater than 60° C. to produce a higher density portion and a lower density portion,
wherein:
the lower density portion comprises ≤25% of the particles in the fluid-feed mixture, based on the weight of particles in the feed-fluid mixture, or
the lower density portion comprises ≤500 ppmw of particles having a size of greater than 25 μm, based on the weight of the lower density portion.

13 . The process of claim 12 , wherein the lower density portion comprises about 250 ppmw or less of particles having a size >25 μm, based on the weight of the lower density portion.

14 . The process of claim 12 , wherein the lower density portion comprises about 100 ppm or less of particles having a size >25 μm, based on the weight of the particles in the feed-fluid mixture.

15 . The process of claim 12 , further comprising hydroprocessing at least a portion of the lower density portion.

16 . The process of claim 12 , wherein the fluid comprises a solvent selected from the group consisting of benzene, ethylbenzene, trimethylbenzene, xylenes, toluene, naphthalenes, alkylnaphthalenes, tetralins, alkyltetralins, and any combination thereof.

17 . The process of claim 12 , wherein the fluid-feed mixture is centrifuged at a temperature of greater than 60° C. to about 200° C.

18 . The process of claim 12 , wherein the particles of the fluid-feed mixture have a specific gravity from about 1.04 to about 1.5.

19 . A process for preparing a low particulate liquid hydrocarbon product comprising:
blending an SCT comprising particles with a fluid to produce a fluid-feed mixture comprising tar, the particles, and the fluid, wherein the fluid-feed mixture comprises greater than 500 ppm of the particles having a size of greater than 25 μm, and wherein the particles have a specific gravity from about 1.04 to about 1.5; and centrifuging the fluid-feed mixture at a temperature of greater than 60° C. to produce a higher density portion and a lower density portion, wherein the lower density portion comprises 500 ppmw or less of the particles having a size of greater than 25 μm, based on the weight of the lower density portion.

20 . The process of claim 19 , wherein the fluid-feed mixture is centrifuged at a temperature of greater than 60° C. to about 200° C.

21 . The process of claim 19 , wherein the lower density portion comprises no more than 10 wt % of the particles in the fluid-feed mixture, based on the weight of the particles in the fluid-feed mixture.

22 . The process of claim 19 , wherein the lower density portion comprises no more than 5 wt % of the particles in the fluid-feed mixture, based on the weight of the particles in the fluid-feed mixture.

23 . The process of claim 19 , wherein the lower density portion comprises no more than 2 wt % of the particles in the fluid-feed mixture, based on the weight of the particles in the fluid-feed mixture.

24 . The process of claim 19 , wherein the lower density portion is substantially free of the particles of size greater than 25 μm.

25 . The process of claim 19 , wherein the lower density portion comprises about 250 ppmw or less of the particles having a size of greater than 25 μm, based on the weight of the lower density portion.

26 . The process of claim 19 , further comprising hydroprocessing at least a portion of the lower density portion.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Coleman John S
• Kandel Kapil
• Clemmons Michael J
• Xu Teng
• Contello Giovanni S

Classifications

• C10G2300/201

  Impurities · CPC title

• C10G31/06

  by heating, cooling, or pressure treatment · CPC title

• C10G55/04 Primary

  including at least one thermal cracking step · CPC title

• C10G2300/206

  Asphaltenes · CPC title

• C10G69/06

  including at least one step of thermal cracking in the absence of hydrogen · CPC title